EMTP THEORY BOOK

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Transcript of EMTP THEORY BOOK

Page 1: EMTP THEORY BOOK

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CONTENTS

(Click topic to jump to its location)

CHAPTER PAGE

1. INTRODUCTION TO THE SOLUTION METHOD USED IN THE EMTP 6

2. LINEAR, UNCOUPLED LUMPED ELEMENTS 14

3. LINEAR, COUPLED LUMPED ELEMENTS 45

4. OVERHEAD TRANSMISSION LINES 64

5. UNDERGROUND CABLES 150

6. TRANSFORMERS 192

7. SIMPLE VOLTAGE AND CURRENT SOURCES 238

8. THREE-PHASE SYNCHRONOUS MACHINE 251

9. UNIVERSAL MACHINE 311

10. SWITCHES 339

11. SURGE ARRESTERS AND PROTECTIVE GAPS 354

12. SOLUTION METHODS IN THE EMTP 360

13. TRANSIENT ANALYSIS OF CONTROL SYSTEMS (TACS) 395

APPENDIX

I – NUMERICAL SOLUTION OF ORDINARY D IFFERENTIAL EQU ATION S 413

II – RE-INITI ALIZATION AT IN STANTS OF DISCONTINUITIES 431

III – SOLUTION OF LINEAR EQUA TIONS, MATRIX REDUCTION AND

INVERSION, SPARCITY 434

IV – ACTUAL VALUES VERSUS PERUNIT QUAN TIT IES 452

V – RECURSIVE CONVOLUTION 459

VI – TRANSIENT AND SUBTRANSIENT PARA METERS OF SYNCHRONOUS

MACHINES 460

VII – INTERNAL I MPEDANCE OF STRANDED CONDUCTORS 470

REFERENCES 472

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with the first diagonal element being the zero sequence (ground mode) impedance, and the next M-1 diagonal elements

being the positive sequence (aerial mode) impedance,

and similarly for the capacitances,

To refer to the two distinct diagonal elements as zero and positive sequence may be confusing, because the

concept of sequence values has primarily been used for three-phase lines. "Ground mode" and "aerial mode" may be

more appropriate. Confusion is most likely to arise for double-circuit three-phase lines, where each three-phase line

has its own zero and positive sequence values defined by Eq. (4.50) and (4.51) with symmetrical components used for

each three-phase circuit, while in the context of this section the double-circuit line is treated as a six-phase line with

different zero and positive sequence values defined by Eq. (4.60) and (4.61). The fact that the terms zero and positive

sequence are used for M û 3 as well comes from the generalization of symmetrical components of Section 4.1.4 to M

phases with the transformation matrix [56, p. 155]

Page 99: EMTP THEORY BOOK

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A special case of interest for symmetric bipolar dc lines is M = 2. In this case [T] of Eq. (4.58) and [S] of11

Eq. (4.62a) are identical,

4.1.3.3 Two Identical Three-Phase Lines with Zero Sequence Coupling Only

Just as a transposed single-circuit three-phase line can usually be approximated as a balanced line, so two

identical and parallel three-phase lines can often be approximated as "almost balanced" lines with an impedance matrix

of the form

The transposition scheme of Fig. 4.22 would produce such a matrix form, which implies that the two circuits are only

coupled in zero sequence, but not in positive or negative sequence. Such a complicated transposition scheme is seldom,

if ever, used, but the writer suspects that positive and negative sequence couplings in the more common double-circuit

transposition scheme of Fig. 4.23 is often so weak that the model discussed here may be a useful approximation for the

case of Fig. 4.23 as well.

Page 100: EMTP THEORY BOOK

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< )

.' < )

RQU

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T h e

matrix of Eq. (4.64) is diagonalized by modifying the transformation matrix of Eq. (4.58) to

with [T] = [T] again, which produces the diagonal matrix-1 t

Z’ G

Z’ IL

Z’ L

Z’ (4.66)L

Z’ L

Z’ L

If each circuit has three-phase sequence parameters Z’ , Z’ , and if the three-phase zero sequence coupling betweenzero pos

the two circuits is Z’ , then the ground mode G, inter-line mode IL and line mode L values required by the EMTPzero-coupling

are found from

with identical equations for the capacitances.

If the two three-phase circuits are not identical, then the transformation matrix of Eq. (4.65) can no longer be

used; instead, [T] depends on the particular tower configuration.

Page 101: EMTP THEORY BOOK

=XRJCUG? ' =5? =X

U[OO? CPF =X

U[OO? ' =5?&� =X

RJCUG?

YJGTG =XU[OO? '

X\GTQ

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=5? ' �

� � �

� C � C

� C C �

=5?&� '�

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=5?&� ' =5Â?V

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4.1.4 Symmetrical Components

Symmetrical components are not used as such in the EMTP, except that the parameters of balanced lines after

transformation to M-phase , , 0-components are the same as the parameters of symmetrical components, namely zero

and positive sequence values. The supporting routine LINE CONSTANTS does have output options for more detailed

symmetrical component information, however, which may warrant some explanations.

In addition to zero and positive sequence values, LINE CONSTANTS also prints full symmetrical component

matrices. Its diagonal elements are the familiar zero and positive sequence values of the line; they are correct for the

untransposed line as well as for a line which has been balanced through proper transpositions. The off-diagonal

elements are only meaningful for the untransposed case, because they would become zero for the balanced line. For

the untransposed case, these off-diagonal elements are used to define unbalance factors [47, p. 93]. The full symmetrical

component matrices are no longer symmetric, unless the columns for positive and negative sequence are exchanged [27].

This exchange is made in the output of the supporting routine LINE CONSTANTS with rows listed in order "zero, pos,

neg,..." and columns in order "zero, neg, pos,...". With this trick, matrices can be printed in triangular form (elements

in and below the diagonal), as is done with the matrices for individual and equivalent phase conductors.

Symmetrical components for two-phase lines are calculated with the transformation matrix of Eq. (4.63), while

those of three-phase lines are calculated with

identical for currents,

and a = e .j120E

The columns in these matrices are normalized ; in that form, [S] is unitary,12

Page 102: EMTP THEORY BOOK

=< )

U[OO? '=5?&� �

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RJCUG

=5? �

� =5?

=< )

U[OO? '

< )

\GTQ&+� � <

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� < )

RQU&+� � � �

� � < )

RQU&+� � �

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� � < )

\GTQ&++� �

� � � � < )

RQU&++�

� � � � � < )

RQU&++

����

�����

where "*" indicates conjugate complex and "t" transposition.

For M $ 3, the supporting routine LINE CONSTANTS assumes three-phase lines in parallel. Examples:

M = 6: Two three-phase lines in parallel

M = 9: Three-phase lines in parallel

M = 8: Two three-phase lines in parallel, with equivalent phase conductors no. 7 and 8 ignored in the

transformation to symmetrical components.

The matrices are then transformed to three-phase symmetrical components and not to M-phase symmetrical components

of Eq. (4.62). For example for M = 6 (double-circuit three-phase line),

with [S] defined by Eq. (4.68), Eq. (4.70) produces the three-phase symmetrical component values required in Eq.

(4.67).

Balancing of double-circuit three-phase lines through transpositions never completely diagonalizes the

respective symmetrical component matrices. The best that can be achieved is with the seldom-used transposition scheme

of Fig. 4.22, which leads to

(4.71)

If both circuits are identical, then Z’ = Z’ = Z’ , and Z’ = Z’ = Z’ ; in that case, the transformation matrixzero-I zero-II zero pos-I pos-II pos

of Eq. (4.65) can be used for diagonalization. The more common transposition scheme of Fig. 4.23 produces positive

and zero sequence coupling between the two

Page 103: EMTP THEORY BOOK

: � �*: � �

� : �*� : �

� � :*� � :

: � �*: � �

� : �*� : �

� � :*� � :

: � �*: � �

� : �*� � :

� � :*� : �

: � �*: � �

� � :*� : �

� : �*� � :

����

(a) barrels rolled in (b) barrels rolled inopposite direction same direction

Fig. 4.23 - Double-circuit transposition scheme

circuits as well, with the nonzero pattern of the matrix in Eq. (4.71) changing to

where "X" indicates nonzero terms. Re-assigning the phases in Fig. 4.23(b) to CI, BI, AI, AII, BII, CII from top to

bottom would change the matrix further to cross-couplings between positive sequence of one circuit and negative

sequence of the other circuit, and vice versa,

4.1.5 Modal Parameters

From the discussions of Section 4.1.3 it should have become obvious that the solution of M-phase transmission

line equations becomes simpler if the M coupled equations can be transformed to M decoupled equations. These

decoupled equations can then be solved as if they were single-phase equations. For balanced lines, this transformation

is achieved with Eq. (4.58).

Many lines are untransposed, however, or each section of a transposition barrel may no longer be short

compared with the wave length of the highest frequencies occurring in a particular study, in which case each section

must be represented as an untransposed line. Fortunately, the matrices of untransposed lines can be diagonalized as

well, with transformations to "modal" parameters derived from eigenvalue/eigenvector theory. The transformation

matrices for untransposed lines are no longer known a priori, however, and must be calculated for each particular pair

of parameter matrices [Z’ ] and [Y’ ].phase phase

To explain the theory, let us start again from the two systems of equations (4.31) and (4.32),

Page 104: EMTP THEORY BOOK

&F8

RJCUG

FZ' =< )

RJCUG? =+

RJCUG?

&F+

RJCUG

FZ' =; )

RJCUG?=8

RJCUG?

F �8RJCUG

FZ �' =< )

RJCUG? =; )

RJCUG? =8

RJCUG?

F �+RJCUG

FZ �' =; )

RJCUG? =< )

RJCUG? =+

RJCUG?

F �8OQFG

FZ �' =7? =8

OQFG?

=8RJCUG? ' =6

X? =8

OQFG?

=8OQFG? ' =6

X?&� =8

RJCUG?

F �8OQFG

FZ �' =6

X?&� =< )

RJCUG? =; )

RJCUG? =6

X? =8

OQFG?

����

����C�

����D�

����C�

����D�

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and

with [Y’ ] = j [C’ ] if shunt conductances are ignored, as is customarily done. By differentiating the first equationphase phase

with respect to x, and replacing the current derivative with the second equation, a second-order differential equation for

voltages only is obtained,

Similarly, a second-order differential equation for currents only can be obtained,

where the matrix products are now in reverse order from that in Eq. (4.73a), and therefore different. Only for balanced

matrices, and for the lossless high-frequency approximations discussed in Section 4.1.5.2, would the matrix products

in Eq. (4.73a) and (4.73b) be identical.

With eigenvalue theory, it becomes possible to transform the two coupled equations (4.73) from phase

quantities to "modal" quantities in such a way that the equations become decoupled, or in terms of matrix algebra, that

the associated matrices become diagonal, e.g., for the voltages,

with [ ] being a diagonal matrix. To get from Eq. (4.73a) to (4.74), the phase voltages must be transformed to mode

voltages, with

and

Then Eq. (4.73a) becomes

Page 105: EMTP THEORY BOOK

=7? ' =6X?&� =< )

RJCUG? =; )

RJCUG? =6

X?

6 =< )

RJCUG? =; )

RJCUG? & 8

M=7? > =V

XM? ' �

=+RJCUG? ' =6

K? =+

OQFG?

����� 6JKU�KU�KORQTVCPV�KH�OCVTKEGU�=6 ?�QDVCKPGF�HTQO�FKHHGTGPV�RTQITCOU�CTG�EQORCTGF���6JG�CODKIWKV[�ECP�DG��X

TGOQXGF�KP�C�PWODGT�QH�YC[U��G�I���D[�CITGGKPI�VJCV�VJG�GNGOGPVU�KP�VJG�HKTUV�TQY�UJQWNF�CNYC[U�DG������QT�D[PQTOCNK\KPI�VJG�EQNWOPU�VQ�C�'WENKFGCP�XGEVQT�NGPIVJ�QH������VJCV�KU��D[�TGSWKTKPI�V V �� �V V �� �����������X� X� X� X�

YKVJ�V����EQPLWICVG�EQORNGZ�QH�V���+P�VJG�NCVVGT�ECUG��VJGTG�KU�UVKNN�CODKIWKV[�KP�VJG�UGPUG�VJCV�GCEJ�EQNWOP�EQWNFDG�OWNVKRNKGF�YKVJ�C�TQVCVKQP�EQPUVCPV�G �CPF�UVKNN�JCXG�XGEVQT�NGPIVJ�������L"

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which, when compared with Eq. (4.74), shows us that

To find the matrix [T ] which diagonalizes [Z’ ][Y’ ] is the eigenvalue/eigenvector problem. The diagonal elementsv phase phase

of [ ] are the eigenvalues of the matrix product [Z’ ][Y’ ], and [T ] is the matrix of eigenvectors or modal matrixphase phase v

of that matrix product. There are many methods for finding eigenvalues and eigenvectors. The most reliable method

for finding the eigenvalues seems to be the QR-transformation due to Francis [3], while the most efficient method for

the eigenvector calculation seems to be the inverse iteration scheme due to Wilkinson [4, 5]. In the supporting routines

LINE CONSTANTS and CABLE CONSTANTS, the "EISPACK"-subroutines [67] are used, in which the eigenvalues

and eigenvectors of a complex upper Hessenberg matrix are found by the modified LR-method due to Rutishauser. This

method is a predecessor of the QR-method, and where applicable, as in the case of positive definite matrices, is more

efficient than the QR-method [68]. To transform the original complex matrix to upper Hessenberg form, stabilized

elementary similarity transformations are used. For a given eigenvalue , the corresponding eigenvector [t ] (= k-thk vk

column of [T ]) is found by solving the system of linear equationsv

with [U] = unit or identity matrix. Eq. (4.77) shows that the eigenvectors are not uniquely defined in the sense that they

can be multiplied with any nonzero (complex) constant and still remain proper eigenvectors , in contrast to the13

eigenvalues which are always uniquely defined.

Floating-point overflow may occur in eigenvalue/eigenvector subroutines if the matrix is not properly scaled.

Unless the subroutine does the scaling automatically, [Z’ ][Y’ ] should be scaled before the subroutine call, byphase phase

dividing each element by -( g µ ), as suggested by Galloway, Shorrows and Wedepohl [39]. This division brings20 0

the matrix product close to unit matrix, because [Z' ][Y' ] is a diagonal matrix with elements - g µ if resistances,phase phase 0 02

internal reactances and Carson's correction terms are ignored in Eq. (4.7) and (4.8), as explained in Section 4.1.5.2. The

eigenvalues from this scaled matrix must of course be multiplied with -g µ to obtain the eigenvalues of the original20 0

matrix. In [39] it is also suggested to subtract 1.0 from the diagonal elements after the division; the eigenvalues of this

modified matrix would then be the p.u. deviations from the eigenvalues of the lossless high-frequency approximation

of Section 4.1.5.2, and would be much more separated from each other than the unmodified eigenvalues which lie close

together. Using subroutines based on [67] gave identical results with and without this subtraction of 1.0, however.

In general, a different transformation must be used for the currents,

Page 106: EMTP THEORY BOOK

=+OQFG? ' =6

K?&� =+

RJCUG?

F �+OQFG

FZ �' =7? =+

OQFG?

=6K? ' =6 V

X ?&�

F �8OQFG&M

FZ �' 8

M8OQFG&M

F �8

FZ �' (�8

����

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and

because the matrix products in Eq. (4.73a) and (4.73b) have different eigenvectors, though their eigenvalues are

identical. Therefore, Eq. (4.73b) is transformed to

with the same diagonal matrix as in Eq. (4.74). While [T ] is different from [T ], both are fortunately related to eachi v

other [58],

where "t" indicates transposition. It is therefore sufficient to calculate only one of them.

Modal analysis is a powerful tool for studying power line carrier problems [59-61] and radio noise interference

[62, 63]. Its use in the EMTP is discussed in Section 4.1.5.3. It is interesting to note that the modes in single-circuit

three-phase lines are almost identical with the , , 0-components of Section 4.1.3.1 [58]. Whether the matrix products

in Eq. (4.73) can always be diagonalized was first questioned by Pelissier in 1969 [64]. Brandao Faria and Borges da

Silva have shown in 1985 [65] that cases can indeed be constructed where the matrix product cannot be diagonalized.

It is unlikely that such situations will often occur in practice, because extremely small changes in the parameters (e.g.,

in the 8th significant digit) seem to be enough to make it diagonalizable again. Paul [66] has shown that diagonalization

can be guaranteed under simplifying assumptions, e.g., by neglecting conductor resistances.

The physical meaning of modes can be deduced from the transformation matrices [T ] and [T ]. Assume, forv i

example, that column 2 of [T] has entries of (-0.6, 1.0, -0.4). From Eq. (4.78a) we would then know that mode-2 currenti

flows into phase B in one way, with 60% returning in phase A and 40% returning in phase C.

4.1.5.1 Line Equations in Modal Domain

With the decoupled equations of (4.74) and (4.79) in modal quantities, each mode can be analyzed as if it were

a single-phase line. Comparing the modal equation

with the well-known equation of a single-phase line,

with the propagation constant defined in Eq. (1.15), shows that the modal propagation constant is the squaremode-k

Page 107: EMTP THEORY BOOK

(OQFG&M

' "M% L$

M' (

M

RJCUG XGNQEKV[ 'T$M

YCXG NGPIVJ '�B$M

&F8

OQFG

FZ' =6

X?&� =< )

RJCUG? =6

K? =+

OQFG?

=< )

OQFG? ' =6

X?&� =< )

RJCUG? =6

K?

=< )

OQFG? ' =6

KV? =< )

RJCUG? =6

K?

=; )

OQFG? ' =6K?&� =; )

RJCUG? =6X?

=; )

OQFG? ' =6

XV? =; )

RJCUG? =6

X?

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root of the eigenvalue,

with

= attenuation constant of mode k (e.g., in Np/km),k

= phase constant of mode k (e.g., in rad/km).k

The phase velocity of mode k is

and the wavelength is

While the modal propagation constant is always uniquely defined, the modal series impedance and shunt

admittance as well as the modal characteristic impedance are not, because of the ambiguity in the eigenvectors.

Therefore, modal impedances and admittances only make sense if they are specified together with the eigenvectors used

in their calculation. To find them, transform Eq. (4.72a) to modal quantities

The triple matrix product in Eq. (4.83) is diagonal, and the modal series impedances are the diagonal elements of this

matrix

or with Eq. (4.80),

Similarly, Eq. (4.72b) can be transformed to modal quantities, and the modal shunt admittances are then the diagonal

elements of the matrix

or with Eq. (4.80),

Page 108: EMTP THEORY BOOK

<EJCT&OQFG&M

'< )

OQFG&M

; )

OQFG&M

<EJCT&OQFG&M

'(OQFG&M

; )

OQFG&M

< )

OQFG&M'

8M

; )

OQFG&M

=6K? ' =; )

RJCUG? =6

X? =; )

OQFG?&�

=6K? ' =; )

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X? =&?

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The proof that both [Z’ ] and [Y’ ] are diagonal is given by Wedepohl [58]. Finally, the modal characteristicmode mode

impedance can be found from the scalar equation

or from the simpler equation

A good way to obtain the modal parameters may be as follows: First, obtain the eigenvalues and thek

eigenvector matrix [T ] of the matrix product [Z’ ][Y’ ]. Then find [Y’ ] from Eq. (4.85b), and the modal seriesv phase phase mode

impedance from the scalar equation

The modal characteristic impedance can then be calculated from Eq. (4.86a), or from Eq. (4.86b) if the propagation

constant from Eq. (4.81) is needed as well. If [T ] is needed, too, it can be found efficiently from Eq. (4.85a)i

because the product of the first two matrices is available anyhow when [Y’ ] is found, and the post-multiplication withmode

[Y’ ] is simply a multiplication of each column with a constant (suggested by Luis Marti). Eq. (4.85c) alsomode-1

establishes the link to an alternative formula for [T ] mentioned in [57],i

with [D] being an arbitrary diagonal matrix. Setting [D] = [Y’ ] leads us to the desirable condition [T ] = [T ] ofmode i v-1 t -1

Eq. (4.80). If the unit matrix were used for [D], all modal matrices in Eq. (4.84) and (4.85) would still be diagonal, but

with the strange-looking result that all modal shunt admittances become 1.0 and that the modal series impedances

become . Eq. (4.80) would, of course, no longer be fulfilled. For a lossless line, the modal series impedance wouldk

then become a negative resistance, and the modal shunt admittance would become a shunt conductance with a value of

1.0 S. As long as the case is solved in the frequency domain, the answers would still be correct, but it would obviously

be wrong to associate such modal parameters with

(with R’ negative and G’ = 1.0) in the time domain.

Page 109: EMTP THEORY BOOK

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4.1.5.2 Lossless High-Frequency Approximation

In lightning surge studies, many simplifying assumptions are made. For example, the waveshape and amplitude

of the current source representing the lightning stroke is obviously not well known. Similarly, flashover criteria in the

form of volt-time characteristics or integral formulas [8] are only approximate. In view of all these uncertainties, the

use of highly sophisticated line models is not always justified. Experts in the field of lightning surge studies normally

use a simple line model in which all wave speeds are equal to the speed of light, with a surge impedance matrix [Z ]surge

in phase quantities, where

with r being the radius of the conductor, or the radius of the equivalent conductor from Eq. (4.30) in case of a bundlei

conductor. 14

Typically, each span between towers is represented separately as a line, and only a few spans are normally

modelled (3 for shielded lines, or 18 for unshielded lines in [8]). For such short distances, losses in series resistances

and differences in modal travel times are negligible. The effect of corona is sometimes included, however, by modifying

the simple model of Eq. (4.87) [8].

It is possible to develop a special line model based on Eq. (4.87) for the EMTP, in which all calculations are

done in phase quantities. But as shown here, the simple model of Eq. (4.87) can also be solved with modal parameters

as a special case of the untransposed line. The simple model follows from Eq. (4.72) by making two assumptions for

a "lossless high-frequency approximation":

1. Conductor resistances and ground return resistances are ignored.

2. The frequencies contained in the lightning surges are so high that all currents flow on the surface of

the conductors, and on the surface of the earth.

Then the elements of [Z’ ] becomephase

while [Y’] is obtained by inverting the potential coefficient matrix,

with the elements of [P’] being the same as in Eq. (4.88) if the factor j µ /(2 ) is replaced by 1/(2g ). Then both matrix0 0

Page 110: EMTP THEORY BOOK

8M' &T�g

�z�� M'�����/

&T�g�z�=7? % LT4 )=2 )?&�� =V

XM? ' 8

M=VXM?

=2 )?&� =VXM? ' 8

M&OQFKHKGF=VXM?

LT4 )8M&OQFKHKGF

' 8M% T�g

�z�

=6X? =6

X?V ' =7?

=6K? ' =6

X?

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products in Eq. (4.73) become diagonal matrices with all elements being

These values are automatically obtained from the supporting routines LINE CONSTANTS and CABLE

CONSTANTS as the eigenvalues of the matrix products in Eq. (4.73), by simply using the above two assumptions in

the input data (all conductor resistances = 0, GMR/r = 1.0, no Carson correction terms). The calculation of the

eigenvector matrix [T ] or [T ] needed for the untransposed line model of Section 4.2 breaks down, however, becausev i

the matrix products in Eq. (4.73) are already diagonal. To obtain [T ], let us first assume equal, but nonzero conductorv

resistances R’. Then the eigenvectors [t ] are defined byvk

with the expression in parentheses being the matrix product [Z’ ][Y’ ], and [U] = unit matrix. Eq. (4.91) can bephase phase

rewritten as

with modified eigenvalues

Eq. (4.92) is valid for any value of R’, including zero. It therefore follows that [T ] is obtained as the eigenvectors ofv

[P’] , or alternatively as the eigenvectors of [P’] since the eigenvectors of a matrix are equal to the eigenvectors of its-1

inverse. The eigenvalues of [P] are not needed because they are already known from Eq. (4.90), but they could also-1

be obtained from Eq. (4.93) by setting R’ = 0.

For this simple mode, [T ] is a real, orthogonal matrix,v

and therefore,

D.E. Hedman has solved this case of the lossless high-frequency approximation more than 15 years ago [45]. He

recommended that the eigenvectors be calculated from the surge impedance matrix of Eq. (4.87), which is the same as

calculating them from [P’] since both matrices differ only by a constant factor.

One can either modify the line constants supporting routines to find the eigenvectors from [P’] for the lossless

high-frequency approximation, as was done in UBC’s version, or use the same trick employed in Eq. (4.91) in an

unmodified program: Set all conductor resistances equal to some nonzero value R’, set GMR/r = 1, and ask for zero

Carson correction terms. If the eigenvectors are found from [P’], then it is advisable to scale this matrix first by

multiplying all elements with 2 g .0

The lossless high-frequency approximation produces eigenvectors which differ from those of the lossy case

Page 111: EMTP THEORY BOOK

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=<UWTIG&RJCUG

? '

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S

����

(KI���������2QUKVKQP�QH�RJCUG�EQPFWEVQTU�#��$�%�CPF�ITQWPF�YKTG�&�CXGTCIG�JGKIJV��CNNFKOGPUKQPU�KP�O����%QPFWEVQT�FKCOGVGT����������OO

at very high frequencies [61]. This is unimportant for lightning surge studies, but important for power line carrier

problems.

Example: For a distribution line with one ground wire (Fig. 4.24) the lossless high-frequency approximation produces

the following modal surge impedances and transformation matrix,

mode Z ( )surge-mode

1 993.442 209.673 360.704 310.62

Converted to phase quantities, the surge impedance matrix becomes [T ][Z ][T ] , orv surge-mode vt

Page 112: EMTP THEORY BOOK

����

The elements from Eq. (4.87) are slightly larger, by a factor of 300,000/299,792, because the supporting routine LINECONSTANTS uses 299,792 km/s for the speed of light, versus 300,000 km/s implied in Eq. (4.87).

Representation in EMTP then would be by means of a 4-phase, constant-parameter, lossless line. The followingbranch cards are for the first of 4 such cascaded sections:

-11A 2A 993.44 .3E-6 2 4 -11B 2B 993.44 .3E-6 2 4 -11C 2C 993.44 .3E-6 2 4 -11D 2D 993.44 .3E-6 2 4

The modelling of long lines as coupled shunt resistances [R] = [Z ] has already been discussed in Sectionsurge-phase

3.1.3. In the example above, such a shunt resistance matrix could be used to represent the rest of the line after the 4

spans from the substation. Simply using the 4 x 4 matrix would be unrealistic with respect to the ground wire, however,

because it would imply that the ground wire is ungrounded on the rest of the line. More realistic, though not totally

accurate, would be a 3 x 3 matrix obtained from [Z’ ] and [Y’ ] in which the ground wire has been eliminated. Thisphase phase

model implies zero potential everywhere on the ground wire, in contrast to the four spans where the potential will more

or less oscillate around zero because of reflections up and down the towers.

Comparison with More Accurate Models: For EMTP users who are reluctant to use the simple model described in this

section, a few comments are in order. First, let us compare exact values with the approximate values. If we use constant

parameters and choose 400 kHz as a reasonable frequency for lightning surge studies, then we obtain the results of table

4.5 for the test example above, assuming T/D = 0.333 for skin effect correction and internal inductance calculation with

the tubular conductor formula, R’ = 0.53609 /km, and = 100 m.dc

Table 4.5 - Exact line parameters at 400 kHz

mode Z ( ) wave velocity (m/s) R’ ( /km)surge-mode

1 1027.6-j33.9 285.35 597.42 292.0-j0.5 299.32 7.93 361.9-j0.5 299.37 8.24 311.1-j0.5 299.32 8.0

The differences are less than 0.5% in surge impedance and wave speed for the aerial modes 2 to 4, and not more than

5% for the ground return mode 1. These are small differences, considering all the other approximations which are made

in lightning surge studies. If series resistances are included by lumping them in 3 places, totally erroneous results may

be obtained if the user forgets to check whether R/4 # Z in the ground return mode. For the very short line lengthsurge

of 90 m in this example, this condition would still be fulfilled here.

Using constant parameters at a particular frequency is of course an approximation as well, and some users may

therefore prefer frequency-dependent models. For very short line lengths, such as 90 m in the example, most frequency-

dependent models are probably unreliable, however. It may therefore be more sensible to use the simple model

Page 113: EMTP THEORY BOOK

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described here, for which answers are reliable, rather than sophisticated models with possibly unreliable answers.

A somewhat better lossless line model for lightning surge studies than the preceding one has been suggested

by V. Larsen [92]. To obtain this better model, the line parameters are first calculated in the usual way, at a certain

frequency which is typical for lightning surges (e.g., at 400 kHz). The resistances are then set to zero when the matrix

product [Z’ ][Y’ ] is formed, before the modal parameters are computed. With this approach, [T ] will always bephase phase i

real. Table 4.6 shows the modal parameters of this better lossless model. They differ very little from those in Table

4.5.

Table 4.6 - Approximate modal parameters at 400 kHz with R=0

mode Z ( ) wave velocity (m/s)surge-mode

1 1026.3 285.50

2 292.0 299.32

3 362.0 299.37

4 311.1 299.32

In particular, the wave velocity of the ground return mode 1 is now much closer to the exact value of Table 4.5. The

transformation matrix which goes with the modal parameters of Table 4.6 is

In this case [T ] is no longer to [T ]; Eq. (4.80) must be used instead.v i

4.1.5.3 Approximate Transformation Matrices for Transient Solutions

The transformation matrices [T ] and [T ] are theoretically complex, and frequency-dependent as well. Withv i

a frequency-dependent transformation matrix, modes are only defined at the frequency at which the transformation

matrix was calculated. Then the concept of converting a polyphase line into decoupled single-phase lines (in the modal

domain) cannot be used over the entire frequency range. Since the solution methods for transients are much simpler

if the modal composition is the same for all frequencies, or in other words, if the transformation matrices are constant

with real coefficients, it is worthwhile to check whether such approximate transformation matrices can be used without

producing too much error. Fortunately, this is indeed possible for overhead lines [66, 78].

Guidelines for choosing approximate (real and constant) transformation matrices have not yet been worked out

at the time when these notes are being written. The frequency-dependent line model of J. Marti discussed in Section

4.2.2.6 needs such a real and constant transformation matrix, and wrong answers would be obtained if a complex

transformation matrix were used instead. Since a real and constant transformation matrix is always an approximation,

Page 114: EMTP THEORY BOOK

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its use will always produce errors, even if they are small and acceptable. The errors may be small in one particular

frequency region, and larger in other regions, depending on how the approximation is chosen.

One choice for an approximate transformation matrix would be the one used in the lossless approximations

discussed in Section 4.1.5.2. This may be the best choice for lightning surge studies.

For switching surge studies and similar types of studies, the preferred approach at this time seems to be to

calculate [T ] at a particular frequency (e.g., at 1 kHz), and then to ignore the imaginary part of it. In this approach, [T ]v v

should be predominantly real before the imaginary part is discarded. One cannot rely on this when the subroutine

returns the eigenvectors, since an eigenvector multiplied with e or any other constant would still be a properj50E

eigenvector. Therefore, the columns of [T ] should be normalized in such a way that its components lie close to the realv

axis. One such normalization procedure was discussed by V. Brandwajn [79]. The writer prefers a different approach,

which works as follows:

1. Ignore shunt conductances, as is customarily done. Then [Y’ ] is purely imaginary. Use Eq. (4.85)phase

to find the diagonal elements of the modal shunt admittance matrix Y’ .mode-k-preliminary

2. In general, these "preliminary" modal shunt admittances will not be purely imaginary, but j C’ emode-k-

instead. Then normalize [T ] by multiplying each column with e . With this normalizedj k j k/2v

transformation matrix, the modal shunt admittances will become j C’ , or purely imaginary as inmode-k

the phase domain.

3. To obtain the approximate (real and constant) transformation matrix, discard the imaginary part of

the normalized matrix from step 2.

4. Use the approximate matrix [T ] from step 3 to find modal series impedances and modal shuntv-approx.

admittances from Eq. (4.84) and (4.85) over the frequency range of interest. If [T ] is needed, usei

5. If the line model requires nonzero shunt conductances, add them as modal parameters. Usually, only

conductances from phase to ground are used (with phase-to-phase values being zero); in that case,

the modal conductances are the same as the phase-to-ground conductances if the latter are equal for

all phases.

An interesting method for finding approximate (real and constant) transformation matrices has been suggested

by Paul [66]. By ignoring conductor resistances, and by assuming that the Carson correction terms R’ + j X’ in Eq.ii ii

(4.7) and R’ + j X’ in Eq. (4.8) are all equal (all elements in the matrix of correction terms have one and the sameik ik

value), the approximate transformation matrix [T ] is obtained as the eigenvectors of the matrix producti-approx.

with all elements of the second matrix being 1. To find [T ], Eq. (4.96) would have to be used. Wasley andv-approx.

Page 115: EMTP THEORY BOOK

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Selvavinayagamoorthy [93] find the approximate transformation matrices by simply taking the magnitudes of the

complex elements, with an appropriate sign reflecting the values of their arguments. They compared results using these

approximate matrices with the exact results (using complex, frequency-dependent matrices), and report that fairly high

accuracy can be obtained if the approximate matrix is computed at a low frequency, even for the case of double-circuit

lines.

If the M-phase line is assumed to be balanced (Section 4.1.3.2), then the transformation matrix is always real

and constant, and known a priori with Eq. (4.58) and Eq. (4.59). Two identical and balanced three-phase lines with zero

sequence coupling only have the real and constant transformation matrix of Eq. (4.65).

4.2 Line Models in the EMTP

The preceding Section 4.1 concentrated on the line parameters per unit length. These are now used to develop

line models for liens of a specific length.

For steady-state solutions, lines can be modelled with reasonable accuracy as nominal -circuits, or rigorously

as equivalent -circuits. For transient solutions, the methods become more complicated, as one proceeds from the simple

case of a single-phase lossless line with constant parameters to the more realistic case of a lossy polyphase line with

frequency-dependent parameters.

4.2.1 AC Steady-State Solutions

Lines can be represented rigorously in the steady-state solution with exact equivalent -circuits. Less accurate

representations are sometimes used, however, to match the model to the one used in the transient simulation (e.g.,

lumping R in three places, rather than distributing it evenly along the line, or using approximate real transformation

matrices instead of exact complex matrices). For lines of moderate "electrical" length (typically # 100 km at 60 Hz),

nominal -circuits are often accurate enough, and are probably the best models to use for steady-state solutions at power

frequency. If the steady-state solution is followed by a transient simulation, or if steady-state solutions are requested

over a wide frequency range, then the nominal -circuit must either be replaced by a cascade connection of shorter

nominal -circuits, or by an exact equivalent -circuit derived from the distributed parameters.

4.2.1.1 Nominal M-Phase -Circuit

For the nominal M-phase -circuit of Fig. 3.10, the series impedance matrix and the two equal shunt

susceptance matrices are obtained from the per unit length matrices by simply multiplying them with the line length, as

shown in Eq. (4.35) and (4.36). The equations for the coupled lumped elements of this M-phase -circuit have already

been discussed at length in Section 3, and shall not be repeated here.

Nominal -circuits are fairly accurate if the line is electrically short. This is practically always the case if

complicated transposition schemes are studied at power frequency (60 Hz or 50 Hz). Fig. 4.25 shows a typical example,

with three circuits on the same right-of-way. In this case, each of the five transposition sections (1-2, 2-3, 3-4, 4-5, 5-6)

would be represented as a nominal 9-phase -circuit. While a nominal -circuit would already be reasonably accurate

Page 116: EMTP THEORY BOOK

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for the total line length of 95 km, nominal -circuits are certainly accurate for each transposition section, since the

longest section is only 35 km long. A comparison between measurements on the de-energized line L3 and computer

results is shown in table 4.7 [80]. The coupling in this case is predominantly capacitive.

Table 4.7 - Comparison between measurements and EMTP results (voltages on energized line L1 =372 kV and on L2 = 535 kV)

phase measurement EMTP results

Induced voltages on de-energized line L3 if open at A 30 kV 27.5 kVboth ends B 15 kV 13.8 kV

C 10 kV 7.8 kV

Grounding currents if de-energized line L3 is A 11 A 10.5 Agrounded at right end B 5 A 3.2 A

C 1 A 1.5 A

Because nominal -circuits are so useful for studying complicated transposition schemes, a "CASCADED PI"

option was added to the BPA EMTP. With this option, the entire cascade connection is converted to one single -

circuit, which is an exact equivalent for the cascade connection. This is done by adding one "component" at a time, as

shown in Fig. 4.26. The "component" may either be an M-phase -circuit, or other types of network elements such as

Page 117: EMTP THEORY BOOK

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shunt reactors or series capacitors. Whenever component k is added, the nodal admittance matrix

for nodes 1, 2, 3 is reduced by eliminating the inner nodes 2, to form the new admittance matrix of the equivalent for

the cascaded components 1, 2, ... K. This option keeps the computational effort in the steady-state solution as low as

possible by not having to use nodal equations for the inner nodes of the cascade connection, at the expense of extra

computational effort for the cascading procedure.

4.2.1.2 Equivalent -Circuit for Single-Phase Lines

Lines defined with distributed parameters at input time are always converted to equivalent -circuits for the

steady-state solution.

For lines with frequency-dependent parameters, the exact equivalent -circuit discussed in Section 1 is used,

with Eq. (1.14) and (1.15). The same exact equivalent -circuit is used for distortionless and lossless line models with

constant parameters.

In many applications, line models with constant parameters are accurate enough. For example, positive

sequence resistances and inductances are fairly constant up to approximately 1 kHz, as shown in Fig. 4.20. But even

with constant parameters, the solution for transients becomes very complicated (except for the unrealistic assumption

of distortionless propagation). Fortunately, experience showed that reasonable accuracy can be obtained if L’ and C’

are distributed and if

is lumped in a few places as long as R << Z . In the EMTP, R/2 is lumped in the middle and R/4 at both ends of ansurge

otherwise lossless line, as shown in Fig. 4.27, and as further discussed in Section 4.2.2.5. For this transient

representation, the EMTP uses the same assumption in the15

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steady-state solution, to avoid any discrepancies between ac steady-state initialization and subsequent transient

simulation, even though experiments have shown that the differences are extremely small at power frequency. By using

equivalent -circuits for each lossless, half-length section in Fig. 4.27, and by eliminating the "inner" nodes 1, 2, 3, 4,

an equivalent -circuit (Fig. 1.2) was obtained by R.M. Hasibar with

where

4.2.1.3 Equivalent M-Phase -Circuit

To obtain an equivalent M-phase -circuit, the phase quantities are first transformed to modal quantities with

Eq. (4.84) and (4.85) for untransposed lines, or with Eq. (4.58) and (4.59) for balanced lines. For identical balanced

three-phase lines with zero sequence coupling only, Eq. (4.65) is used. For each mode, an equivalent single-phase -

circuit is then found in the same way as for single-phase lines; that is, either as an exact equivalent -circuit with Eq.

(1.14) and (1.15), or with Eq. (4.98) and (4.99) for the case of lumping R in three places. These single-phase modal

-circuits each has a series admittance Y and two equal shunt admittances 1/2 Y . By assembling theseseries-mode shunt-mode

admittances as diagonal matrices, the admittance matrices of the M-phase -circuit in phase quantities are obtained from

and

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While it is always possible to obtain the exact equivalent M-phase -circuit at any frequency in this way,

approximations are sometimes used to match the representation for the steady-state solution to the one used in the

transient solution. One such approximation is the lumping of resistances as shown in Fig. 4.27. Another approximation

is the use of real and constant transformation matrices in Eq. (4.100) and (4.101), as discussed in Section 4.1.5.3.

4.2.2 Transient Solutions

Historically, the first line models in the EMTP were cascade connections of -circuits, partly to prove that

computers could match switching surge study results obtained on transient network analyzers (TNA’s) at that time. On

TNA’s, balanced three-phase lines are usually represented with decoupled 4-conductor -circuits, as shown in Fig. 4.28.

This representation can easily be derived from Eq. (4.44) by rewriting it as

for phase A, and similar for phases B and C. The first term in Eq. (4.102) is Z’ I (or branch A1-A2 in Fig. 4.28),pos A

while the second term is the common voltage drop caused by the earth and ground wire return current I + I + IA B C

(branch N1-N2 in Fig. 4.28). Note, however, that Fig. 4.28 is only valid if the sum of the currents flowing out through

a line returns through the earth and ground wires of that same line. For that reason, the neutral nodes N2, N3, ... must

be kept floating, and only N1 at the sending end is grounded. Voltages with respect to ground at location i are obtained

by measuring between the phase and node N . In meshed networks with different R/X-ratios, this assumption is probablyi

not true. For this reason, and to be able to handle balanced as well as untransposed lines with any number of phases,

M-phase -circuits were modelled directly with M x M matrices, as discussed in Section 4.1.2.4. Voltages to ground

are then simply the node voltages. Comparisons between these M-phase -circuits, and with the four-conductor -

circuits of Fig. 4.28 confirmed that the results are identical.

Page 120: EMTP THEORY BOOK

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The need for travelling wave solutions first arose in connection with rather simple lightning arrester studies,

where lossless single-phase line models seemed to be adequate. Section 1 briefly discusses the solution method used

in the EMTP for such lines. This method was already known in the 1920’s and 1930’s and strongly advocated by

Bergeron [81]; it is therefore often called Bergeron’s method. In the mathematical literature, it is known as the method

of characteristics, supposedly first described by Riemann.

It soon became apparent that travelling wave solutions were much faster and better suited for computers than

cascaded -circuits. To make the travelling wave solutions useful for switching surge studies, two changes were needed

from the simple single-phase lossless line: First, losses had to be included, which could be done with reasonable

accuracy by simply lumping R in three places. Secondly, the method had to be extended to M-phase lines, which was

achieved by transforming phase quantities to modal quantities. Originally, this was limited to balanced lines with built-

in transformation matrices, then extended to double-circuit lines, and finally generalized to untransposed lines. Fig. 4.29

compared EMTP results with results obtained on TNA’s, using the built-in transformation matrix for balanced three-

phase lines and simply lumping R in three places.

Fig. 4.29 - Energization of a three phase line. Computer simulation results (dotted line) superimposed on 8 transient

Page 121: EMTP THEORY BOOK

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network analyzer results for receiving end voltage in phase B. Breaker contacts close at 3.05 ms in phase A, 8,05 ms

in phase B, and 5.55 ms in phase C (t=0 when source voltage of phase A goes through zero from negative to positive)

[82]. Reprinted by permission of CIGRE

While travelling wave solutions with constant distributed L’, C’ and constant lumped R produced reasonable

accurate answers in many cases, as shown in Fig. 4.29, there were also cases where the frequency dependence,

especially of the zero sequence impedance, could not be ignored. Choosing constant line parameters at the dominant

resonance frequency sometimes improved the results. Eventually, frequency-dependent line models were developed

by Budner [83], by Meyer and Dommel [84] based on work of Snelson [85], by Semlyen [86], and by Ametani [87].

A careful re-evaluation of frequency-dependence by J. Marti [88] led to a fairly reliable solution method, which seems

to become the preferred option as these notes are being written. J. Marti’s method will therefore be discussed in more

detail.

4.2.2.1 Nominal -Circuits

Nominal -circuits are generally not the best choice for transient solutions, because travelling wave solutions

are faster and usually more accurate. Cascade connections of nominal -circuits may be useful for untransposed lines,

however, because one does not have to make the approximations for the transformation matrix discussed in Section

4.1.5.3. On the other hand, one cannot represent frequency-dependent line parameters and one has to accept the

spurious oscillations caused by the lumpiness. Fig. 4.30 shows these oscillations for the simple case of a single-phase

line being represented with 8 and 32 cascaded nominal -circuits. The exact solution with distributed parameters is

shown for comparison purposes as well. The proper choice of the number of -circuits for one line is discussed in [89],

as well as techniques for damping the spurious oscillations with damping resistances in parallel with the series R-L

branches of the -circuit of Fig. 4.28.

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Fig. 4.30 - Voltage at receiving end of a single phase line if a dc voltage of 10 V is connected to the sending end at t=0(line data: R=0.0376 /mile, L=1.52 mH/mile, C=14.3 nF/mile, length-320 miles; receiving end terminated with shuntinductance of 100 mH)

The solution methods for nominal -circuits have already been discussed in Section 3.4. With M-phase

nominal -circuits, untransposed lines (or sections of a line) are as simple to represent as balanced lines. In the former

case, one simply uses the matrices of the untransposed line, whereas in the latter case one would use matrices with

averaged equal diagonal and averaged equal off-diagonal elements.

4.2.2.2 Single-Phase Lossless Line with Constant L’ and C’

The solution method for the single-phase case has already been explained in Section 1. The storage scheme

for the history terms is the same as the one discussed in the next Section 4.2.2.3 for M-phase lossless lines, except that

each single-phase line occupies only one section in the table, rather than M section for M modes. Similarly, the

initialization of the history terms for cases starting from linear ac steady-state initial conditions is the same as in Eq.

(4.108).

Page 123: EMTP THEORY BOOK

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The solution is exact as long as the travel time is an integer multiple of the step size t. If this is not the case,

then linear interpolation is used in the EMTP, as indicated in Fig. 4.31. Linear interpolation is believed to be a

reasonable approximation for most cases, since the curves are usually smooth rather than discontinuous. If

discontinuities or very sharp peaks do exist, then rounding to the nearest integer multiple of t may be more sensible

than interpolation, however. There is no option for this rounding procedure in the EMTP, but the user can easily

accomplish this through changes in the input data. Fig. 4.32 compares results for the case of Fig. 4.30 with sharp peaks

with and without linear interpolation. The line was actually not lossless in this case, but the losses were represented

in a simple way by subdividing the line into 64 lossless sections and lumping resistances in between and at both ends.

The interpolation errors are more severe if lines are split up into many sections, as was done here. If the line were only

split up into two lossless sections, with R lumped in between and at both ends, then the errors in the peaks would be

less (the first peak would be 18.8, and the second peak would be -15.4).

The accumulation of interpolation errors on a line broken up into many sections, with of each section not

being an integer multiple of t, can easily be explained. Assume that a triangular pulse is switched onto a long, lossless

line, which is long enough so that no reflections come back from the remote end during the time span of the study (Fig.

4.33). Let us look at how this pulse becomes distorted through interpolation as it travels down the line if

(a) the line is broken up into short sections of travel time 1.5 t each, and

(b) the line from the sending end to the measuring point is represented as one section ( = k @ 1.5 t, with k = 1,

2, 3,...).

At any point on the line, the current will be

and between points 1 and 2 separated by (Fig. 4.33),

This last equation was used in Fig. 4.34, together with linear interpolation, to find the shape of the pulse as it travels

Page 125: EMTP THEORY BOOK

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down the line. The pulse loses its amplitude and becomes wider and wider if it is broken up into sections of travel time

1.5 t each. On the other hand, the pulse shape never becomes as badly distorted if the line is represented as one single

section.

What are the practical consequences of this interpolation error? Table 4.8 compares peak overvoltages from

a BPA switching surge study on a 1200 kV three-phase line , 133 miles long. Each section was split up into two16

lossless half-sections, with R lumped in the middle and

Table 4.8 - Interpolation errors in switching surge study with t = 50 µs

Run Line modelPeak overvoltages (MV)

phase A phase B phase C

1 single section 1.311 1.191 1.496

2 7 sections 1.276 1.136 1.457

3 single section with 1.342 1.167 1.489rounded

at both ends, as explained in Section 4.2.2.4. Run no. 1 shows the results of the normal line representation as one

section. Run no. 2 with subdivision into 7 sections produces differences of 2.6 to 4.7%. In run no. 3 the zero and

positive sequence travel times = 664.93 µs and = 445.74 µs were rounded to 650 and 450 µs, respectively, to make0 1

them integer multiples of t = 50 µs. These changes could be interpreted as a decrease in both L' and C' of 2.25%,0 0

and as an increase in both L' and C' of 0.96%, with the surge impedances remaining unchanged. Since line parameters1 1

are probably no more accurate than ±5% at best anyhow, these implied changes are quite acceptable. With rounding,

a slightly modified case is then solved without interpolation errors. Whether an option for rounding to the nearest

integer multiple of t should be added to the EMTP is debatable. In general, rounding may imply much larger changes

in L', C' than in this case, and if implemented, warning messages with the magnitude of these implied changes should

be added as well. In Table 4.8, runs no. 3 to 1 differ by no more than 2.3%, and the interpolation error is therefore

acceptable if the line is represented as one section. Breaking the line up into very many sections may produce

unacceptable interpolation errors, however.

If the user is interested in a "voltage profile" along the line, then a better alternative to subdivisions into

sections would be a post-processor "profile program" which would calculate

Page 126: EMTP THEORY BOOK

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voltages and currents at intermediate points along the line from the results at both ends of the line. Such a program is

easy to write for lossless and distortionless lines. Luis Marti developed such a profile algorithm for the more

complicated frequency-dependent line models, which he merged into the time step loop of the EMTP [90]. This was

used to produce moves of travelling waves by displaying the voltage profile at numerous points along the line at time

intervals of t.

Fig. 4.34(a) suggests a digital filtering effect from the interpolation which is similar to that of the trapezoidal

rule described in Section 2.2.1. To explain this effect, Eq. (1.6) must first be transformed from the time domain

into the frequency domain,

For simplicity, let us assume that voltage and current phasors V and I at node m are known, and that we want to findm mk

I = V /Z - I at node k. Without interpolation errors, Eq. (4.103) provides the answer. If interpolation is used, and ifk km

for the sake of simplicity we assume that the interpolated value lies in the middle of an interval t, then Eq. (4.103)

becomes

Therefore, the ratio of the interpolated to the exact value becomes

which is indeed somewhat similar to Fig. 2.10 for the error produced by the trapezoidal rule.

Single-phase lossless line models can obviously only approximate the complicated phenomena on real lines.

Nonetheless, they are useful in a number of applications, for example

(a) in simple studies where one wants to gain insight into the basic phenomena,

(b) in lightning surge studies, and

(c) as a basis for more sophisticated models discussed later.

For lightning surge studies, single-phase lossless line models have been used for a long time. They are

probably accurate enough in many cases because of the following reasons:

(1) Only the phase being struck by lightning must be analyzed, because the voltages induced in the other

phases will be much lower.

(2) Assumptions about the lightning stroke are by necessity very crude, and very refined line models are

therefore not warranted.

Page 128: EMTP THEORY BOOK

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(3) The risk of insulation failure in substations is highest for backflashovers at a distance of approx. 2

km or less. Insulation co-ordination studies are therefore usually made for nearby strokes. In that

case, the modal waves of an M-phase line "stay together," because differences in wave velocity and

distortion among the M waves are still small over such short distances. They can then easily be

combined into one resultant wave on the struck phase. There seems to be some uncertainty, however,

about the value of the surge impedance which should be used in such simplified single-phase

representations. It appears that the "self surge impedance" Z of Eq. (4.87a) should be used. Forii-surge

nearby strokes it is also permissible to ignore the series resistance. Attenuation caused by corona may

be more important than that caused by conductor losses. At the time of writing these notes, corona

is still difficult to model, and it may therefore be best to ignore losses altogether to be on the safe side.

4.2.2.3 M-Phase Lossless Line with Constant L’ and C’

Additional explanations are needed for extending the method of Section 1 from single-phase lines to M-phase

lines. In principle, the equations are first written down in the modal domain, where the coupled M-phase line appears

as if it consisted of M single-phase lines. Since the solution for single-phase lines is already known, this is

straightforward. For solving the line equations together with the rest of the network, which is always defined in phase

quantities, these modal equations must then be transformed to phase quantities, as schematically indicated in Fig. 4.35.

For simplicity, let us assume that the line has 3 phases. Then, with the notations from Fig. 4.35, each mode

is described by an equation of the form of Eq. (1.6), or

Page 129: EMTP THEORY BOOK

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where each history term hist was computed and stored earlier. For mode a, this history term would be

and analogous for modes b and c. These history terms are calculated for both ends of the line as soon as the solution

has been obtained at instant t, and entered into a table for use at a later time step. As indicated in Fig. 4.36, the history

terms of a three-phase line would occupy 3 sections of the history tables for modes a, b, c, and the length of each section

would be / t, with being the travel time of the particular mode increased to the nearest integer multipleincreased increased

of t . Since the modal travel times , , differ from each other, the 3 sections in this table are generally of different17a b c

length. This is also the reason for storing history terms as modal values, because one has to go back different travel

times for each mode in picking up history terms. For the solution at time t, the history terms of Eq. (4.106) are obtained

by using linear interpolation on the top two entries of each mode section.

Page 130: EMTP THEORY BOOK

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After the

solution in each time step, the entries in the tables of Fig. 4.36 must be shifted upwards by one location, thereby

throwing away the values at the oldest point at t- . This is then followed by entering the newly calculated historyincreased

terms hist(t) at the newest point t. Instead of physically shifting values, the EMTP moves the pointer for the starting

address of each section down by 1 location. When this pointer reaches the end of the table, it then goes back again to

the beginning of the table ("wrap-around table") [91].

The initial values for the history terms must be known for t = 0, - t, -2 t, ... - . The necessity forincreased

knowing them beyond t = 0 comes from the fact that only terminal conditions are recorded. If the conditions were also

given along the line at travel time increments of t, then the initial values at t = 0 would suffice. For zero initial

conditions, the history table is simply preset to zero. For linear ac steady-state conditions (at one frequency ), the

history terms are first computed as phasors (peak, not rms),

Page 131: EMTP THEORY BOOK

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where V and I are the voltage and current phasors at line end m (analogous for HIST ). With HIST = *HIST* · e ,m mk mkj

the instantaneous history terms are then

(4.108b)

Eq. (4.108) is used for single-phase lines as well as for M-phase lines, except that mode rather than phase quantities

must be used in the latter case.

Eq. (4.106) are interfaced with the rest of the network by transforming them from modal to phase quantities

with Eq. (4.78a),

with the surge admittance matrix in phase quantities,

and the history terms in phase quantities,

For a lossless line with constant L' and C', the transformation matrix [T ] will always be real, as explained in the lasti

paragraph of Section 4.1.5.2. It is found as the eigenvector matrix of the product [C'][L'] for each particular tower

configuration, where [L'] and [C'] are the per unit length series inductance and shunt capacitance matrices of the line.

For balanced lines, [T ] is known a priori from Eq. (4.58), and for identical balanced three-phase lines with zeroi

sequence coupling only it is known a priori from Eq. (4.65).

The inclusion of Eq. (4.109) into the system of nodal equations (1.8a) for the entire network is quite

straightforward. Assume that for the example of Fig. 4.35, rows and columns for nodes 1A, 1B, 1C follow each other,

as do those for nodes 2A, 2B, 2C (Fig. 4.37). Then the 3 x 3 matrix [Y ] enters into two 3 x 3 blocks on the diagonal,surge

as indicated in Fig. 4.37, while the history terms [hist ] = [hist , hist , hist ] of Eq. (4.109c) enter into rows1-2 1A-2A 1B-2B 1C-2Cphase

1A, 1B, 1C, on the right-hand side with negative signs. Analogous history terms for terminal 2 enter into rows 2A, 2B,

Page 132: EMTP THEORY BOOK

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2C on the right-hand side. While [Y ] is entered into [G] only once outside the time-step loop, the history terms mustsurge

be added to the right-hand side in each time step.

M-phase lossless line models are useful, among other things, for

(a) simple studies where one wants to investigate basic phenomena,

(b) in lightning surge studies, where single-phase models are no longer adequate, and

(c) as a basis for more sophisticated models discussed later.

Lightning surge studies cannot always be done with single-phase models. For simulating backflashovers on

lines with ground wires, for example, the ground wire and at least the struck phase must be modelled ("2-phase line").

Since it is not always known which phase will be struck by the backflashover, it is probably best to model all three

phases in such a situation ("4-phase line"). An example for such a study is discussed in Section 4.1.5.2, with 4-phase

lossless line models representing the distribution line, and single-phase lossless line models representing the towers.

Not included in the data listing are switches (or some other elements) for the simulation of potential flashovers from

the tower top (nodes D) to phases A, B, C.

4.2.2.4 Single and M-Phase Distortionless Lines with Constant Parameters

Distortionless line models are seldom used, because wave propagation on power transmission lines is far from

distortionless. They have been implemented in the EMTP, nonetheless, simply because it takes only a minor

modification to change the lossless line equation into the distortionless line equation.

Page 133: EMTP THEORY BOOK

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A single-phase transmission line, or a mode of an M-phase line, is distortionless if

Losses are incurred in the series resistance R’ as well as in the shunt conductance G’. The real shunt conductance of

an overhead line is very small (close to zero), however. If its value must be artificially increased to make the line

distortionless, with a resulting increase in shunt losses, then it is best to compensate for that by reducing the series

resistance losses. The EMTP does this automatically by regarding the input value R’ as an indicator for the totalINPUT

losses, and uses only half of it for R’,

With this formula, the ac steady-state results are practically identical for the line being modelled as distortionless or with

R lumped in 3 places; the transient response differs mainly in the initial rate of rise. From Eq. (4.111), the attenuation

constant becomes

The factor 1/2 can also be justified by using an approximate expression for the attenuation constant for lines with low

attenuation and low distortion [48, p. 257],

which is reasonably accurate if R’ << L’ and G’ << C’. This condition is fulfilled on overhead lines, except at very

low frequencies. Eq. (4.112) is then obtained by dropping the term with G’ and by ignoring the fact that the wavesINPUT

are not only attenuated but distorted as well.

If a user wants to represent a truly distortionless line where G’ is indeed nonzero, then the factor 1/2 should

of course not be used. The factor 1/2 is built into the EMTP, however, and the user must therefore specify R’ twiceINPUT

as large as the true series resistance in this case.

With known, an attenuation factor e is calculated (ý = length of line). The lossless line of Eq. (1.6) is then- ý

changed into a distortionless line by simply multiplying the history term of Eq. (1.6b) with this attenuation factor,

The surge impedance remains the same, namely %L’/C’.

For M-phase lines, any of the M modes can be specified as distortionless. Mixing is allowed (e.g., mode 1

could be modelled with lumped resistances, and modes 2 and 3 as distortionless).

Page 134: EMTP THEORY BOOK

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Better results are usually obtained with the lumped resistance model described next, even though lumping of

resistances in a few places is obviously an approximation, whereas the distortionless line is solved exactly if the travel

time is an integer multiple of t.

4.2.2.5 Single and M-Phase Lines with Lumped Resistances

Experience has shown that a lossy line with series resistance R’ and negligible shunt conductance can be

modelled with reasonable accuracy as one or more sections of lossless lines with lumped resistances in between. The

simplest such approach is one lossless line with two lumped resistances R/2 at both ends. The equation for this model

is easily derived from the cascade connection of R/2 - lossless line - R/2, and leads to a form which is identical with that

of Eq. (1.6),

except that the values for the surge impedance and history terms are slightly modified. With Z, R and calculated from

Eq. (4.99),

and

This model with R/2 at both ends is not used in the EMTP. Instead, the EMTP goes one step further and lumps

resistances in 3 places, namely R/4 at both ends and R/2 in the middle, as shown in Fig. 4.27. This approach was taken

because the form of the equation still remains the same as in Eq. (4.115), except that

now. The history term becomes more complicated , and contains conditions from both ends of the line at t - ,18

Page 135: EMTP THEORY BOOK

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Users who want to lump resistances in more than 3 places can do so with the built-in three-resistance model,

by simply subdividing the line into shorter segments in the input data. For example, 32 segments would produce lumped

resistances in 65 places. Interestingly enough, the results do not change much if the number of lumped resistances is

increased as long as R << Z. For example, results in Fig. 4.30 for the distributed-parameter case were practically

identical for lumped resistances in 3, 65, or 301 places. Fig. 4.29 shows as well that TNA results are closely matched

with R lumped in 3 places only.

One word of caution is in order, however. The lumped resistance model gives reasonable answers only if R/4

<< Z, and should therefore not be used if the resistance is high. High resistances do appear in lightning surge studies

if the parameters are calculated at a high frequency, e.g., at 400 kHz in Table 4.5, where R’ = 597.4 /km in the zero

sequence mode. Lumping R in 3 places would still be reasonable in the case discussed there where each tower span of

90 m is modelled as one line, since 13.4 is still reasonably small compared with Z = 1028 . If it were used to model

a longer line, say 90 km, then R/4 = 13,400 , which would produce totally erroneous results . In such a situation it19

might be best to ignore R altogether, or to use the frequency-dependent option if higher accuracy is required.

For M-phase lines, any of the M modes can be specified with lumped resistances. Mixing is allowed (e.g.,

mode 1 could be modelled with lumped resistances, and modes 2, ... M as distortionless). The lumped resistances do

not appear explicitly as branches, but are built into Eq. (4.115) (4.116) and (4.117) for each mode. Should a user want

to add them explicitly as branches, e.g., for testing purposes, then they would have to be specified as M x M - matrices

[R] in phase quantities, which could easily be done with the M-phase nominal -circuit input option by setting L =

0 and C = 0. All modes would have to use the lumped resistance model in this set-up, that is, mixing of models would

not be allowed in it.

4.2.2.6 Single and M-Phase Lines with Frequency-Dependent Parameters

The two important parameters for wave propagation are the characteristic impedance

and the propagation constant

Both parameters are functions of frequency, even for constant distributed parameters R’, L’, G’, C’ (except for lossless

and distortionless lines). The line model with frequency-dependent parameters can handle this case of constant

Page 136: EMTP THEORY BOOK

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distributed parameters , even though it has primarily been developed for frequency-dependent series impedance20

parameters R’( ) and L’( ). This frequency-dependence of the resistance and inductance is most pronounced in the zero

sequence mode, as seen in Fig. 4.20. Frequency-dependent line models are therefore important for types of transients

which contain appreciable zero sequence voltages and currents. One such type is the single line-to-ground fault.

To develop a line model with frequency-dependent parameters which fits nicely into the EMTP, it is best to

use an approach which retains the basic idea behind Bergeron’s method. Let us therefore look at what the expression

v + Zi used by Bergeron looks like now, as one travels down the line. Since the parameters are given as functions of

frequency, this expression must first be derived in the frequency domain. At any frequency, the exact ac steady-state

solution is described by the equivalent -circuit of Eq. (1.13), or in an input-output relationship form more convenient

here,

which can be found in any textbook on transmission lines. Assume that we want to travel with the wave from node m

to node k. Then the expression V + Z I is obtained by subtracting Z times the second row from the first row in Eq.c c

(4.120),

or rewritten as

with a negative sign on I since its direction is opposite to the travel direction. Eq. (4.121) is very similar to Bergeron’skm

method; the expression V + Z I encountered when leaving node m, after having been multiplied with a propagationc

factor e , the same when arriving at node k. This is very similar to Bergeron’s equation for the distortionless line,- ý

except that the factor is e there, and that Eq. (4.121) is in the frequency domain here rather than in the time domain.- ý

Before proceeding further, it may be worthwhile to look at the relationship between the equations in the

frequency and time domain for the simple case of a lossless line. In that case,

Anybody familiar with Fourier transformation methods for transforming an equation from the frequency into the time

domain will recall that a phase sift of e in the frequency domain will become a time delay in the time domain.-j

Furthermore, Z is now just a constant (independent of frequency), and Eq. (4.121) therefore transforms to c

Page 137: EMTP THEORY BOOK

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which is indeed Bergeron’s equation (1.6).

For the general lossy case, the propagation factor

with = + j , contains an attenuation factor e as well as a phase shift e , which are both functions of frequency.- ý -j ý

To explain its physical meaning, let us connect a voltage source V to the sending end m through a source impedancesource

which is equal to Z ( ), to avoid reflections in m (Fig. 4.38). In that case, V + Z I = V . Furthermore, let usc m c mk source

assume that the receiving end k is open. Then from Eq. (4.121),

that is, the propagation factor is the ratio (receiving end voltage) / (source voltage) of an open-ended line if the line is

fed through a matching impedance Z ( ) to avoid reflections at the sending end . If V = 1.0 at all frequencies fromc source21

dc to infinity, then its time domain transform v (t) would be a unit impulse (infinitely high spike which is infinitelysource

narrow with an area of 1.0), and the integral of v (t) would be a unit step. Setting V = 1.0 in Eq. (4.122) showssource source

that A( ) transformed to the time domain must be the impulse which arrives at the other end k, if the source is a unit

impulse. This response to the unit impulse,

will be attenuated (no longer infinitely high), and distorted (no longer infinitely narrow). Fig. 4.39 shows these

responses for a typical 500 kV line of 100 miles length. They were obtained

Page 138: EMTP THEORY BOOK

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(a) zero sequence mode (b) positive sequence (c) positive sequencemode with same mode withscale as (a) expanded scale

Fig. 4.39 - Receiving end response v (t) = a(t) for the network of Fig. 4.38 if v (t) = unit impulse [94]. Reprintedk source

by permission of J. Marti

from the inverse Fourier transformation of A( ) = exp(- ý) calculated by the LINE CONSTANTS supporting routine

at a sufficient number of points in the frequency domain. The amplitude of the propagation factors A( ) for the case

of Fig. 4.39 is shown in Fig. 4.40.

The unit impulse response of a lossless line would be a unit impulse at t = with an area of 1.0. In Bergeron’s

method, this implies picking up the history term v /Z + i at t - with a weight of 1.0. In the more general case here,m mk

history terms must now be picked up at more than one point, and weighted with the "weighting function" a(t). For the

example of Fig. 4.39(a),

Page 139: EMTP THEORY BOOK

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history terms must be picked up starting at = 0.6 ms back in time, to approx. = 2.0 ms back in time. The valuemin max

is the travel time of the fastest waves, while is the travel time of the slowest waves. Each terms has its ownmin max

weight, with the highest weight of approx. 5400 around = 0.7 ms back in time. Mathematically, this weighting of

history at the other end of the line is done with the convolution integral

which can either be evaluated point by point, or more efficiently with recursive convolution as discussed later. The

expression i in Eq. (4.124) is the sum of the line current i and of a current which would flow through them-total mk

characteristic impedance if the voltage v were applied to it (expression I + V /Z in the frequency domain).m mk m c

With propagation of the conditions from m to k being taken care of through Eq. (4.124), the only unresolved

issue is the representation of the term V /Z in Eq. (4.121b). For the same 500 kV line used in Fig. 4.39, the magnitudek c

and angle of the characteristic impedance Z are shown in Fig. 4.41. If the shunt conductance per unit length G’ werec

ignored, as is usually done, Z would become infinite at = 0. This complicates the mathematics somewhat, and sincec

G’ is not completely zero anyhow, it was therefore decided to use a nonzero value, with a default option of 0.03 µs/km.

As originally suggested by E. Groschupf [96] and further developed by J. Marti [94], such a frequency-dependent

impedance can be approximated with a Foster-I R-C

Page 140: EMTP THEORY BOOK

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Page 141: EMTP THEORY BOOK

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network. Then the line seen from node k becomes a simple R-C network in parallel with a current source histpropagation

(Fig. 4.42(a)). One can then apply the trapezoidal rule of integration to the capacitances, or use any other method of

implicit integration. This transforms each R-C block into a current source in parallel with an equivalent resistance.

Summing these for all R-C blocks produces one voltage source in series with one equivalent resistance, or one current

source in parallel with one equivalent resistance (Fig. 4.42(b)). In the solution of the entire network with Eq. (1.8), the

frequency-dependent line is then simply represented again as a constant resistance R to ground, in parallel with aequiv

current source hist + hist , which has exactly the same form as the equivalent circuit for the lossless line.RC propagation

To represent the line in the form of Fig. 4.42 in the EMTP, it is necessary to convert the line parameters into

a weighting function a(t) and into an R-C network which approximates the characteristic impedance. To do this, Z andc

are first calculated with the support routine LINE CONSTANTS, from dc to such a high frequency where both A( )

= exp(- ý) becomes negligibly small and Z ( ) becomes practically constant. J. Marti [94] has shown that it is best toc

approximate A( ) and Z ( ) by rational functions directly in the frequency domain. The weighting function a(t) canc

then be written down explicitly as a sum of exponentials, without any need for numerical inverse Fourier transformation.

Similarly, the rational function approximation of Z ( ) produces directly the values of R and C in the R-C network inc

Fig. 4.42.

Page 142: EMTP THEORY BOOK

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The rational function which approximates A( ) has the form

with s = j and n < m. The subscript "approx" indicates that Eq. (4.125) is strictly speaking only an approximation to

the given function A( ), even though the approximation is very good. The factor e is included to take care of the-j min

fact that a(t) in Fig. 4.39 is zero up to t = ; this avoids fitting exponentials through the portion 0 # t # where themin min

values are zero anyhow (remember that a time shift - in the time domain is a phase shift e in the frequency domain).-j

All poles p and zeros z in Eq. (4.125) are negative, real and simple (multiplicity one). With n < m, the rationali i

function part of Eq. (4.125) can be expanded into partial fractions,

The corresponding time-domain form of Eq. (4.15) then becomes

This weighting function a (t) is used to calculate the history term hist of Eq. (4.124) in each time step.approx propagation

Because of its form as a sum of exponentials, the integral can be found with recursive convolution much more efficiently

Page 143: EMTP THEORY BOOK

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than with a point-by-point integration. If we look at the contribution of one exponential term k e ,i-pi(t- min)

then s (t) can be directly obtained from the value s (t - t) known from the preceding time step, with only 3i i

multiplications and 3 additions,

as explained in Appendix V, with c , c , c being constants which depend on the particular type of interpolation used1 2 3

for i.

The characteristic impedance Z ( ) is approximated by a rational function of the form [94]c

with s = j . All poles and zeros are again real, negative and simple, but the number of poles is equal to the number of

zeros now. This can be expressed as

which corresponds to the R-C network of Fig. 4.42, with

Rather than applying the trapezoidal rule to the capacitances in Fig. 4.42, J. Marti chose to use implicit integration with

Eq. (I.3) of Appendix I , with linear interpolation on i. For each R-c block22

which has the exact solution

Page 144: EMTP THEORY BOOK

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with = 1/(R C ). By using linear interpolation on i, the solution takes the form ofi i i

with e (t - t) being known values of the preceding time step (formula omitted for simplicity), or after summing up overi

all R-C blocks and R ,0

with

which can be rewritten as

The equivalent resistance R enters into matrix [G] of Eq. (1.8), whereas the sum of the history terms hist +equiv RC

hist enters into the right hand side.propagation

The key to the success of this approach is the quality of the rational function approximations for A( ) and

Z ( ). J. Marti uses Bode’s procedure for approximating the magnitudes of the functions. Since the rational functionsc

have no zeros in the right-hand side of the complex plane, the corresponding phase functions are uniquely determined

from the magnitude functions (the rational functions are minimum phase-shift approximations in this case) [94]. To

illustrate Bode’s procedure, assume that the magnitude of the characteristic impedance in decibels is plotted as a function

of the logarithm of the frequency, as shown in Fig. 4.43 [94]. The basic principle is to approximate the given curve by

straight-line segments which are either horizontal or have a slope which is a multiple of 20 decibels/decade. The points

where the slopes change define the poles and zeros of the rational function. By taking the logarithm on both sides of

Eq. (4.130), and multiplying by 20 to follow the convention of working with decibels, we obtain

For s = j , each one of the terms in this expression has a straight-line asymptotic behavior with respect to . For

instance, 20 log *j + z * becomes 20 log z for << z , which is constant, and 20 log for >> z , which is a straight1 1 1 i

line with a slope of 20 db/decade. The approximation to Eq. (4.137) is constructed step by step: Each time a zero corner

(at = z ) is added, the slope of the asymptotic curve is increased by 20 db, or decreased by 20 db each time a polei

corner (at = p ) is added. The straight-line segments in Fig. 4.43 are only asymptotic traces; the actual functioni

becomes a smooth curve without sharp corners. Since the entire curve is traced from dc to the

Page 145: EMTP THEORY BOOK

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Fig. 4.43 - Asymptotic approximation of the magnitude of Z (ω) [94].c

Reprinted by permission of J. Marti

highest frequency at which the approximated function becomes practically constant, the entire frequency range is

approximated quite closely, with the number of poles and zeros not determined a priori. J. Marti improves the accuracy

further by shifting the location of the poles and zeros about their first positions. Fig. 4.44 shows the magnitude and

phase errors of the approximation of A( ), and Fig. 4.45 shows the errors for the approximation of Z ( ) for the linec

used in Fig. 4.39.

L. Marti has recently shown [95] that very good results can be obtained by using lower-order approximations

with typically 5 poles and zeros rather than the 15 poles and zeros used in Fig. 4.44 and 4.45. Furthermore, he shows

that positive and zero sequence parameters at power frequency (50 or 60 Hz) can be used to infer what the tower

geometry of the line was, and use this geometry in turn to generate frequency-dependent parameters. With this

approach, simple input data (60 Hz parameters) can be used to generate a frequency-dependent line model internally

which is fairly accurate.

Page 146: EMTP THEORY BOOK

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(a) zero sequence mode (b) positive sequence mode(15 zeros and 20 poles) (13 zeros and 17 poles)

Fig. 4.44 - Errors in approximation of A( ) for line of Fig. 4.39 [94]. Reprinted by permission of J.Marti

For M-phase lines, any of the M modes can be specified as frequency-dependent, or with lumped resistances,

or as distortionless. Mixing is allowed. A word of caution is in order here, however: At the time of writing these notes,

the frequency-dependent line model works only reliably for balanced lines. For untransposed lines, approximate real

and constant transformation matrices must be used, as explained in Section 4.1.5.3, which seems to produce reasonably

Page 147: EMTP THEORY BOOK

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(a) zero sequence mode (b) positive sequence mode(15 zeros and poles) (16 zeros and poles)

Fig. 4.45 - Errors in approximation of Z ( ) for line for Fig. 4.39 [94]. Reprinted by permission ofc

J. Marti

accurate results for single-circuit lines, but not for double-circuit lines. Research by L. Marti into frequency-dependent

transformation matrices in connection with models for underground cables will hopefully improve this unsatisfactory

state of affairs.

Page 148: EMTP THEORY BOOK

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Page 149: EMTP THEORY BOOK

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Fig. 4.46 - Comparison between voltages at phase b for [94]:(a) Field test oscillograph(b) BPA’s frequency-dependence simulation(c) New model simulationReprinted by permission of J. Marti

Field test results for a single-line-to-ground fault from Bonneville Power Administration have been sued by

various authors to demonstrate the accuracy of frequency-dependent line models [84]. Fig. 4.46 compares the field test

results with simulation results from an older method which used two weighting functions a and a [84], and from the1 2

newer method described here. The peak overvoltage in the field test was 1.60 p.u., compared with 1.77 p.u. in the older

method and 1.71 p.u. in the newer method. Constant 60 Hz parameters would have produced an answer of 2.11 p.u.

Page 150: EMTP THEORY BOOK

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with

Z’ = Z’ from Eq. (5.7c), (5.38b)m pipe-mutual

Z’ = Z’ + Z’ + Z’ . (5.38c)s pipe-out insulation earth

The first two terms in Eq. (5.38c) are found from Eq. (5.7b) and (5.6) (Z’ = 0 if pipe in contact with earth), andinsulation

Z’ is the earth-return impedance discussed in Section 5.3. Transforming Eq. (5.38a) to phase quantities producesearth

same matrix as 0 Z’ Z’ ....Z’ Z’ e

for infinite 0 Z’ Z’ ....Z’ Z’ e

[Z’ ] = pipe thickness . .............. . (5.39a)phase

. .............. .

Z’ Z’ ....Z’ Z’ e

0 0 ... 0 Z’ Z’ ...Z’ Z’ e e e s

with Z ’ from Eq. (5.38c)s

Z ’ = Z ’ - Z ’ (5.39b)e s m

Z’ = Z ’ - 2Z ’s m

The last row and column in Eq. (5.39a) represent the pipe quantities, while the first 9 rows and columns refer to core,

sheath (shield tapes), armor (skid wires) of phases a, b, and c.

If the pipe is in contact with the earth, then the shunt admittance matrix is the same as in Section 5.4.1. If it

is insulated, then the potential coefficient matrix of Eq. (5.34) must be expanded with one extra row and column for the

pipe, and the same element

Page 171: EMTP THEORY BOOK

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The admittance matrix is then again found by inversion with Eq. (5.37).

5.5 Building of Conductors and Elimination of Grounded Conductors

Conductors are sometimes connected together ("bundled"). For example, the concentric neutral conductors

in the cable of Fig. 5.2 are in contact with each other, and therefore electrically connected. In a pipe-type cable, the

shield tapes and skid wires are in contact with the pipe. In a submarine cable, the sheath is often bonded to the armor

at certain intervals, to avoid voltage differences between the sheath and armor.

In such cases, the connected conductors 1,...m can be replaced by (or bundled into) one equivalent conductor,

by introducing the bundling conditions

I + I +...I = I ; V = V = ... V = V (5.42)1 2 m equiv 1 2 m equiv

into the equations for the series impedance and shunt admittance matrices. The bundling procedure for reducing the

equations from m individual to one equivalent conductor is the same as Method 1 of Section 4.1.2.2 for overhead lines,

and is therefore not explained again. It is exact if the conductors are continuously connected with zero connection

resistance (as the neutral conductors in Fig. 5.2), and accurate enough if the connections are made at discrete points with

negligible resistance (as in bonding of the sheath to the armor), as long as the distance between the connection points

is short compared to the wavelength of the highest frequency in the transient simulation.

As in the case of overhead lines with ground wires, some conductors in a cable may be grounded. For example,

the steel pipe of a pipe-type cable can usually be assumed grounded, because its asphalt mastic coating is not an electric

insulation. Also, neutral conductors may be connected to ground at certain intervals, or at both ends. If a conductor

i is grounded, then the condition is simply

V = 0 (5.43)i

and conductor i can then be eliminated from the system of equations in the same way as described in Section 4.1.2.1.

Again, the elimination is only exact if the conductor is grounded continuously with zero grounding resistance, and

accurate enough if the distance between discrete grounding points is short compared to the wavelength of the highest

frequency.

An example of bundled as well as grounded conductors would be a single-core submarine cable which has its

sheath bonded to the armor. Since the asphalt coating of the armor is not an electric insulation, the armor is in effect

Page 172: EMTP THEORY BOOK

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in contact with the sea water, and both sheath and armor are therefore grounded conductors. By eliminating both of

them, the submarine cable can be represented by single-phase equations for the core conductor, with the current return

combined in sea water, armor and sheath. For an overhead line, the equivalent situation would be a single-phase line

with two ground wires.

The case of segmented ground wires in overhead lines discussed in Section 4.1.2.5(b) can exist in cables as

well. For example, if the sheath is grounded at one end, but open and ungrounded at the other end, then the sheath could

be eliminated in the same way as segmented ground wires, provided the cable length is short compared to the wavelength

of the highest frequency. The support routine CABLE CONSTANTS does not have an option for such eliminations.

The user must represent the sheath as an explicit conductor, instead, with one end connected to ground. This offers the

advantage that the induced voltage at the other end can automatically be obtained, if so desired.

5.6 Buried Pipelines

Pipelines buried close to power lines can be subjected to hazardous induction effects, especially during single-

line-to-ground faults. To study these effects, one can include the pipeline as an additional conductor into the

transmission line representation (Fig. 5.14(a)). For steady-state analysis, one can also use the single-phase

representation of Fig. 5.14(b), with an impressed voltage

steady-state analysis, one can also use the single-phase representation of Fig. 5.14(b), with an impressed voltage

There is no capacitive coupling between the power line and the pipeline if it is buried in the ground.

As explained later, nominal -circuits can only be used for very short lengths of pipeline (typically # 0.3 km

at 60 Hz). The single-phase representation is therefore preferable for steady-state analysis, because the distributed

parameters of Fig. 5.14(b) are more easily converted into an exact equivalent -circuit than the polyphase parameters

of Fig. 5.14(a). This results in the active equivalent -circuit of Fig. 5.15, with Y and Y being the usualseries shunt

Page 173: EMTP THEORY BOOK

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parameters obtained from Eq. (1.14), while I is an active current [158],induced

The correctness of the active -circuit can easily be shown. Starting from the differential equations

the introduction of a modified current

I = I + Imodified induced

transforms the differential equations into the normal form of the line equations, with the assumption that I does notinduced

change along the line (dI /dx = dI/dx),modified

The solution for a line between nodes k and m is given in Eq. (1.13), except that the current is now I , or rewritten,modified

This is exactly the same equations which comes out of the equivalent circuit of Fig. 5.15.

Page 174: EMTP THEORY BOOK

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With this single-phase approach, the currents in the power line are assumed to be known, e.g., from the usual

type of short-circuit study. It is also assumed that they are constant over the length of the exposure to the pipeline, and

that the pipeline runs parallel to the power line (mutual impedances constant). If either assumption is not true, then the

power line-pipeline system must be split up into shorter sections as is customarily done in interference studies. The

effect of the pipe on the power line zero sequence impedance is usually ignored, but could be taken into account.

In both representations of Fig. 5.14, the mutual impedances between the pipe and the overhead conductors, as

well as the self impedance of the pipe with earth return, are needed. The mutual impedances are obtained with the

formulas discussed in Section 5.3.4. At 60 Hz, Carson’s formula will give practically identical results as the more

complicated formula of Pollaczek.

The self impedance Z’ of the pipeline consists of the same three terms shown for the armor in Eq. (5.4). Thepp

first two terms are calculated with Eq. (5.7b) and (5.6), while R’ is found from the equations discussed in Sectionearth

5.3.

For the shunt admittance Y’ = G’ + j C’, the capacitive part is calculated in the usual way with Eq. (5.13).pp

In contrast to the underground cable, the shunt conductance G’ of the pipeline can no longer be ignored. The insulation

around pipelines is electrically poor, either originally or because of puncturing during the laying operation. The loss

angle in Eq. (5.14) is so large on pipelines insulated with glass-fiber/bitumen that G’ becomes much larger than C’

at power frequency, and if one part of the shunt admittance is ignored it should be C’ rather than G’. On PVC-insulated

pipelines, G’ may still be smaller than C’, though.

If the shunt resistance of the insulation is relatively small, then the grounding resistance of the pipe should be

connected in series with it [170], or2

where R’ = resistance of pipe insulation,insulation

R’ = grounding resistance.grounding

A useful formula for the grounding resistance is [170]

with = earth resistivity (e.g., in m),earth

h = depth of burial of pipe

ý = length of pipe

Page 175: EMTP THEORY BOOK

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D = outside diameter of pipe.

Grounding grids must generally be analyzed as three-dimensional problems, even if they consist of only one

pipe. The grounding resistance from Eq. (5.47) is therefore no longer an evenly distributed parameter, but depends on

the length. Fortunately, the dependence of G’ on length is very small for typical values of G’ [158]. In the regioninsulation

of measured values for G’ between 0.1 S/km for newly-layed pipelines and 0.3 S/km for older pipelines with glass

fiber/bitumen insulation [170], the dependence of G’ on length is practically negligible, as shown in Fig. 5.16. Treating

G’ as an evenly distributed parameter is therefore a reasonable approximation.

Because of G’ >> C’, the wavelength of buried pipelines is significantly shorter than that of underground

cables, as shown in Table 5.3 [170]. Therefore, a nominal -circuit of a circuit which includes a buried pipeline should

not be longer than approximately 0.8 km for

Table 5.3 - Wavelength of pipeline at 50 Hz [170]

G’ (S/km) wavelength (km)

0.1 41.3

1.0 13.1

10.0 4.13

Page 176: EMTP THEORY BOOK

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steady-state analysis, or approximately 0.08 km for switching surge studies [158].

Fig. 5.17 shows a comparison between measured and calculated voltages and currents in a pipeline, induced

by currents in a neighboring power line, with the pipeline representation as discussed here [158].

5.7 Partial Conductor and Finite Element Methods

The support routine CABLE CONSTANTS uses analytical formulas which are essentially only applicable to

configurations with axial symmetry. The formulas for the nonconcentric configuration in pipe-type cables (Section 5.5)

are only approximate, and the authors of these formulas themselves suggest improvements along the lines discussed

here.

To find the impedances and capacitances for conductor systems with arbitrary shapes (e.g., for the cable of Fig.

5.1), numerical methods can be used in place of analytical formulas, which are either based on subdivisions into partial

conductors or on finite element methods. There is no support routine yet in the EMTP which uses these numerical

methods. The principle of these methods is therefore only outlined very briefly.

Page 177: EMTP THEORY BOOK

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5.7.1 Subdivision into Partial Conductors

With this method, each conductor is subdivided into small "partial" conductors ("subconductors" in [162],

"segments" in [164]), as shown in Fig. 5.18. Various shapes can be used for the partial conductors, with rectangles

being the preferred shape for strip lines in

integrated circuits (Fig. 5.19).

In deriving the equations for the system of partial conductors, uniform current density is assumed within each

partial conductor. Then the voltage drops along a system of n partial conductors at one frequency are described by the

phasor equations

The diagonal resistance matrix contains the dc resistances, and the full inductance matrix contains the self and mutual

inductances of the partial conductors. The formulas for the matrix elements depend on the shape of the partial

conductor, but they are well known.

To obtain the frequency-dependent impedance of a cable system, the matrices [R] and [L] are first computed.

At each frequency, the complex matrix [Z] = [R] + j [L] is formed, and reduced to the number of actual conductors with

Bundling Method 1 of Section 5.5. For example, if partial conductors 1,...50 belong to the core conductor, and partial

Page 178: EMTP THEORY BOOK

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conductors 51,...120 to the sheath, then this bundling procedure will reduce the 120 x 120-matrix to a 2 x 2-matrix,

which produces the frequency-dependent impedances

This numerical method works well as long as the conductors are subdivided into sufficiently small partial

conductors. The size of these partial conductors must be of the same order of magnitude as the depth of penetration.

5.7.2 Finite Element Methods

Finite element methods are more powerful than partial conductor methods in one sense, inasmuch as it is not

necessary to assume uniform current density within each element. However, it is very difficult to handle open-boundary

conditions with finite element methods, that is configurations where the magnetic field diminishes gradually as one

moves away from the conductors, with no clearly defined boundary of known magnetic vector potential reasonably close

to the conductors. In situations where a boundary is clearly defined, e.g., in pipe-type cables at high frequency where

the depth of penetration becomes much less than the wall thickness, finite element methods can be quite useful.

With finite element methods, the region inside and outside of the conductors is subdivided into small elements,

usually of triangular shape. Fig. 5.20(a) shows the example of a stranded conductor inside a pipe of radius R as theb

return path (clearly defined boundary with zero magnetic field A = 0 outside the pipe and zero derivative along the two

edges of the "wedge"). Because of axial symmetry, it is sufficient to analyze the "wedge" shown in Fig. 5.20(a). This

wedge region is then subdivided into triangular elements as shown in Fig. 5.20(b), with longer triangles as one moves

away from the conductor.

The magnetic vector potential A is assumed to vary linearly along the edges and inside of each triangle,

A = ax + by + c, (5.49)

when a first-order method is used (higher-order methods exist as well). The unknowns are essentially the values of A

in the node points. If they were shown in the z-direction of a three-dimensional picture, then the triangles would appear

in a shape similar to a geodesic dome, with the roof height being the value of A. The equations for finding A are linear

algebraic

Page 179: EMTP THEORY BOOK

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equations with a sparse matrix, but the number of node points or the number of equations is usually quite high (146

equations for the example of Fig. 5.20). Once the magnetic vector potential is known in the entire region, the

impedances can be derived from it.

For readers interested in finite element methods for cable impedance calculations, the papers by Konrad, Weiss

and Csendes [165, 166, 167] are a good introduction.

5.8 Modal Parameters

Once the series impedance and shunt admittance matrices per unit length [Z’ ], [Y’ ] are known, thephase phase

derivation of modal parameters is exactly the same as described in Section 4.1.5 for overhead lines. They could be used,

for example, to develop exact equivalent -circuits for steady-state solutions as explained in Section 4.2.1.3.

Page 180: EMTP THEORY BOOK

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For transient simulations, it is more difficult to use modal parameters, as compared to overhead lines, because

the transformation matrix [T ] can no longer be assumed to be constant as for a single-circuit overhead line. Fig. 5.21i

shows the variation of the elements in the third column of [T ] for a typical three-phase arrangement of 230 kV single-i

core cables with core conductor and sheath in each [155]. Especially around the power frequency of 50 or 60 Hz, the

variations are quite pronounced.

Above a few kHz, the loop between core conductor and sheath becomes decoupled from the outer loop between sheath

and earth return, because the depth of penetration on the inside of the sheath for loop 1 becomes much smaller than the

sheath thickness. In that case, Z ~ 0. This makes the transformation matrix constant above a few kHz, as evidenttube-mutual

from Fig. 5.21. For a single-phase single-core cable with sheath and armor, the three modes are identical with the 3

loops described in Eq. (5.1) at high frequency where Z’ ~ 0 and Z’ ~ 0. The transformation matrix between loop and12 23

phase quantities of Eq. (5.9),

5.9 Cable Models in the EMTP

Co-author: L. Marti

As of now (Summer 1986), there are no specific cable models in the BPA EMTP. The only way to simulate

cables is to fit cable data into the models available for overhead lines. It has long been recognized, of course, that this

is only possible in a limited number of cases. A method specifically developed for cables, as discussed in Section

5.9.2.3, will hopefully be implemented in late 1986 or early 1987. It has already been tested extensively in the UBC

Page 181: EMTP THEORY BOOK

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EMTP.

5.9.1 Ac Steady-State Solutions

In principle, there is no difficulty in representing cables as nominal or equivalent -circuits in the same way

as overhead lines (Section 4.2.1). If nominal -circuits are used, it should be realized that the wavelength of

underground cables is shorter than on overhead lines. If a nominal -circuit should not be longer than 100 km at 60 Hz

for overhead lines, the limit is more typically 30 km for underground cables. If a pipeline is modelled, the limit can be

as low as 1 km, as discussed in Section 5.6.

Underground cables are often very short compared to the length of connected overhead lines. In such cases,

the (complicated) series impedances have very little effect on the results because the system sees the cable essentially

as a shunt capacitance. The cable can then be modelled as a simple lumped capacitance.

5.9.2 Transient Solutions

The accurate representation of cables with frequency-dependent impedances and frequency-dependent

transformation matrices is discussed in Section 5.9.2.3. Situations where simpler models should be accurate enough

are discussed first.

5.9.2.1 Short Cables

If a rectangular wave pulse travels on an overhead line and hits a relatively short underground cable, then the

cable termination is essentially seen as a lumped capacitance. The voltage then builds up exponentially with a time

constant of T = Z •C , shown in Fig. 5.22(a). If the cable is modelled somewhat more accurately as a losslessoverhead cable

distributed-parameter line, then the voltage build-up has the staircase shape of Fig. 5.22(b), with the average of the

sending and receiving end curve being more or less the same as the continuous curve in Fig. 5.22(a). As long as the

travel time [] of the cable is short compared to the time constant T, reasonably accurate results can be obtained if the

cable is represented as a lumped capacitance.

(a) Cable represented as lumped (b) Cable represented as

Page 182: EMTP THEORY BOOK

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capacitance lossless transmission line------ sending end of cable...... receiving end of cable

Fig. 5.22 - Voltage build-up in a cable connected to an overhead line

Nominal -circuit representations have often been suggested as approximate cable models. They obviously

represent the capacitance effect correctly, but the pronounced frequency-dependence in the series impedance is ignored.

Nominal -circuits give reasonable answers probably only in those cases in which the simpler lumped capacitance

representation is already accurate enough.

5.9.2.2 Single-Phase Cables

There are situations where single-phase representations are possible. An example is a single-phase submarine

cable in which the sheath and armor are bonded together, with the armor being in contact with the sea water. In such

a case, the sheath and armor can be eliminated from Eq. (5.10), which results in the reduced single-phase equation

with Z’ being the impedance of the core conductor with combined current return through sheath, armor and sea water.core

Coupling to the cables of the other two phases can be ignored because the three cables are layed relatively far apart, to

reduce the risk of anchors damaging more than one phase in the same mishap.

When the equations have been reduced to single-phase equations, then it is straightforward to use the

frequency-dependent overhead line model described in Section 4.2.2.6.

Sometimes it is not necessary to take the frequency-dependence in the series impedances into account. For

example, single phase SF -busses have been modelled quite successfully for fast transients with two decoupled lossless6

single-phase lines, one for the inside coaxial loop and a second one for the outside loop between the enclosure and the

earth-return. The coupling between the two loops through the enclosure is negligible at high frequencies because the

depth of penetration is much less than the enclosure wall thickness. The only coupling occurs through reflections at

the terminations. Agreement between simulation results from such simple models and field tests has been excellent

[169].

5.9.2.3 Polyphase Cables [155]

The simple overhead line models with constant parameters discussed in Section 4.2.2 are of limited use for

underground cables for two reasons:

(a) The transformation matrix [T ] is frequency-dependent up to a few kHz, though a constant [T ] would bei i

acceptable for transients which contain only high frequencies (e.g., lightning surge studies).

(b) The modal parameters (e.g., wave velocity and attenuation) are more frequency-dependent than on overhead

lines, as shown in Fig. 5.23 for three single-core cables with core and sheath [150].

Page 183: EMTP THEORY BOOK

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To derive an accurate model for an n-conductor cable system between nodes k and m, we can start from the

phasor equation (4.121) for the overhead line, if we replace that scalar equation, which was written for one phase or

mode, by a matrix equation for the n conductors,

Page 184: EMTP THEORY BOOK

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with [Y ] = [Z ] = characteristic admittance matrix in phase quantities, c c-1

[A] = e = propagation factor matrix.-j ký

Eq. (5.51) is transformed to modal quantities, with

and

which yields

(5.53)

with both [Y ] and [A ] being diagonal matrices,c-mode mode

The diagonal element of [A ] is obtained from the i-th eigenvalue of the product jY’ k jZ’ k,mode i phase phase

and [T] is the matrix of eigenvectors of the same product [Y’ ] [Z’ ]. Eq. (5.53) consists of n decoupled (scalar)i phase phase

equations, with one equation for each mode.

Transforming these scalar equations into the time domain is the same procedure as described in Section 4.2.2.6

for the overhead line. For mode i, the second term in Eq. (5.53) is found with the same convolution integral as in Eq.

(4.124),

with the current i being the sum of the line current i and of a current which would flow through the characteristicm-total mk

impedance of mode i if the voltage v of mode i were connected across it. Only known history terms appear in Eq.m

(5.55), and hist can therefore be found by n recursive convolutions for the n modes, in the same say as in Sectionpropagation

4.2.2.6. The modal propagation factors are very similar in shape to those of an overhead line, as shown for A ( )mode-3

in Fig. 5.24.

Page 185: EMTP THEORY BOOK

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propagation of the conditions from m to k being taken care of through Eq. (5.55), the only unresolved issue in the modal

domain equations is the representation of the term Y V in Eq. (5.53). Again, the frequency dependence of Y is similarc k c

to that of an overhead line, as shown in Fig. 5.25, and can be represented with the same type of Foster-I R-C network

shown in Fig. 4.42(a), and reproduced here as Fig. 5.26. By applying the trapezoidal rule of integration to the

capacitances, or by using recursive convolution as discussed in Appendix V, the R-C

Page 186: EMTP THEORY BOOK

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network is converted into an equivalent conductance G in parallel with a known current source hist + hist .equiv RC propagation

After the network solution at each time step, the current flowing through the characteristic impedance represented by

the R-C network must be calculated for both ends of the cable from G v + hist , because this term is needed afterequiv RC

the elapse of travel time to form the expression i needed in Eq. (5.55).m-total

From Fig. 5.26(b), it can be seen that each mode is now represented by the scalar, algebraic equation

i (t) = G v (t) + (hist + hist ) (5.56)km equiv k RC propagation

with an analogous equation for i (t) at the other end. If the transformation matrix were constant and real, then Eq.mk

(5.56) could very easily be transformed back to phase quantities,

[i (t)] = [T ][G ][T ] [v ] + [T ][hist]km-phase i equiv i k-phase it

as explained in Eq. (4.109) for the overhead line. As shown in Fig. 5.21, the transformation matrix [T] of cables is veryi

much frequency-dependent, and the transformation back to phase quantities now requires convolutions based on Eq.

(5.52),

where [t ] is a matrix obtained from the inverse Fourier transform of the frequency-dependent matrix [T ]. Similar toi i

the curve fitting used for the modal characteristic impedances, each element of [T ] is again approximated by rationali

functions of the form

Page 187: EMTP THEORY BOOK

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with k , k and p being real constants which, when transformed into the time domain, becomes0 i i

With the simple sum of exponentials in Eq. (5.59), recursive convolution can be applied again (Appendix V). Then,

the convolution integrals in Eq. (5.57) can be split up into a term containing the yet unknown voltages and currents at

time t, and the known history terms which can be updated recursively,

with [t ] being a real, constant n x n-matrix. With Eq. (5.60), the transformation of the modal equations (5.56) to phase0

quantities is now fairly simple,

with

and the history term

[hist ] = [hist ] + [t ]{[G ][hist ]phase current 0 equiv voltage

+ [hist ] + [hist ]} (5.61c)RC propagation

Since the form of Eq. (5.61a) is identical to that of Eq. (4.109) for the overhead line with constant [T], adding the modeli

to the EMTP is the same as described there. The extra effort lies essentially in the evaluation of the two extra history

vectors [hist ] and [hist ]. After the network solution at each time step, Eq. (5.60) is used to obtain the modalcurrent voltage

quantities from the phase quantities.

The principle of the frequency-dependent cable model is fairly simple, but its correct implementation depends

on many intricacies, which are described in [155]. In particular, it is important to normalize the eigenvectors in such

a way that the elements of [T ] as well as the modal surge admittances Y both become minimum phase shifti c-mode-i

functions. This is achieved by making one element of each eigenvector a real and constant number through the entire

frequency range. Furthermore, standard eigenvalue/eigenvector subroutines do not produce smooth curves of [T ] andi

[Y ] as a function of frequency, because the order in which the eigenvalues are calculated often changes as onec-mode

moves from one frequency point to the next. This problem was solved by using an extension of the Jacobi method for

complex symmetric matrices. Symmetry is obtained by reformulating the eigenproblem

Page 188: EMTP THEORY BOOK

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in the form

where

and

with [L] being the lower triangular matrix obtained from the Choleski decomposition of [Y’ ] [157]. The Choleskiphase

decomposition is a modification of the Gauss elimination method, as explained in Appendix III. One can also replace

[L] in Eq. (5.62) with the square root of [Y’ ] obtained fromphase

where [ ] is the diagonal matrix of the square roots of the eigenvalues, and [X[ is the eigenvector matrix of [Y’ ].1/2phase

Both approaches are very efficient if G’ is ignored, or if tan is constant for all dielectrics in the cable system, because

[L] or [Y’ ] must then only be computed once for all frequencies.phase1/2

For parallel single core cables layed in the ground (not in air), [Y’] is diagonal if loop equations are used. In

that case it is more efficient to find the eigenvalues and eigenvectors for [Y’ ][Z’ ], where both [L] and [Y’ ]loop loop loop1/2

become the same diagonal matrix with %Y’ as its elements. The conversion back to phase quantities is trivial withloop-i

Eq. (5.50).

The reason why the Jacobi procedure produces smooth eigenvectors is that the Jacobi algorithm requires an

initial guess for the solution of the eigenvectors. This initial guess is readily available from the solution of the

eigenproblem of the preceding frequency step; consequently, the order of the eigenvectors from one calculation to the

next is not lost.

Figure 5.27(a) shows the magnitude of the elements of row 3 of the eigenvector matrix [T ] for the same 6-i

conductor system as in Fig. 5.24, when standard eigenvalue/eigenvector routines are used. Fig. 5.27(b), on the other

hand, shows the same elements of [T ] calculated with the modified Jacobi algorithm.i

As an application for this cable model, consider the case of three 230 kV single-core cables (with core and

sheath), buried side by side in horizontal configuration, with a length of 10 km. A unit-step voltage is applied to the

core of phase A, and the cores of phases B and C as well as all three sheaths are left ungrounded at both ends. The unit-

step function was approximated as a periodic rectangular pulse of 10 ms duration and a period of 20 ms with a Fourier

series containing 500 harmonics,

Page 189: EMTP THEORY BOOK

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The wave front of this approximation is shown in Fig. 5.28. Choosing a Fourier series

approximation for the voltage source offered the advantage that exact answers could be found as well, by using ac

steady-state solutions with exact equivalent -circuits (Section 4.2.1.3) at each of the 500 frequencies, and by

superimposing them. Fig. 5.29 and 5.30 show the EMTP simulation results in the region of the third pulse,

superimposed on the exact answers. The two

Page 190: EMTP THEORY BOOK

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Fig. 5.27 -Magnitude of the elements of row 3 of [T ] (same 6-conductor system as in Fig. 5.24)i

curves are indistinguishable in this third pulse region where the phenomena have already become more or less periodic.

This shows that the EMTP cable model is capable of producing highly accurate answers. The insert on the right-hand

side of Fig. 5.29 shows the response to the first pulse, where the EMTP simulation results differ slightly from the exact

answers, not because of inaccuracies in the model but because the EMTP starts from zero initial conditions while the

exact answer assumes periodic behavior even for t < 0.

Page 191: EMTP THEORY BOOK

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