Test on 110kV Power Cable After Installation

8/10/2019 Test on 110kV Power Cable After Installation

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Test On 110kV Power Cable After

Installation (2)

Test On 110kV Power Cable After Installation (Part 2)

General description of site test procedure

In previous part of this technical article first three procedures were explained. Now the rest will

be explained in details:

1. Phase indication test (previous part)

2. DC conductor resistance easureent (previous part)

!. Capacitance test (previous part)

". DC #heath test on outher sheath
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$. Insulation resistance easureent

%. Cross bondin& chec'

. ero se*uence and positive se*uence ipedance test (next part)

+. ,arth resistance easureent at lin' boxes (next part)

-. in' box contact resistance easureent (next part)

4. DC sheath test on outher sheath

/he test is applied when the cable sheath can be isolated from the earthto perit a volta&e tobe applied to the over0sheath to chec' the inte&rit of the coverin&.

This testing is generally applied at certain stages of cable system installation at specified

parameter as follows:

1. hen the cable is still on reel. /he applied test volta&e is 13 '4 for 13 seconds5 if a

proper test lead is provided.2. 6nce the cable are laid5 dressed and tied to&ether in trefoil confi&uration a test volta&e of

13 '4 for !3 seconds is applied.

!. 7ollowin& bac'fillin& sand beddind025 a test volta&e of 13 '4 is applied for 1 inute oneach cable. /his is a foral testin& with test records and si&ned b representatives of the

responsible parties as witnesses.

". 7ollowin& copletion of 8ointin& activities between two cable sections in a 8oint ba andafter bac'fillin& of the 8oint ba5 the 8ointed cable sections are then tested b applin& 13

'4 for !3 seconds.

$. 7ollowin& the copletion of cable sste installation and prior to acceptance testin&5 as apre0chec' testin& a test volta&e of 13 '4 is applied for 1 inute.

Note All above mentioned testing will be conducted in presence of project consultant.

References

IEC 608400 Power cables with extruded insulation and their accessories for rated

volta&es above !3 '4 IEC 602290 ,lectric cables 99 /ests on extruded oversheaths with a special protective

function

TE!"!#04$08 ;ondin& and &roundin& of insulated etallic sheath of power cable

sste
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Equipment / Instruments used

/he %C &' 2()' Tester5 2$ anufactured b ;?@A =eran. /he test is

applied onl to cables covered with conductive laer over outer sheath. (Aead ore about Bipo/estin&)

DC Hipo Tester, BAUR PGK 25

Instructions

1. /he coverin& under sheath is exposed abo*t 2 cm lengthat one end of the cable so that

the ne&ative polarit shall be applied to it.2. /he conductive laer on outer sheath shall be reoved abo*t 20 cm wide at a distance

of +0 cmfro both ends of the cable.

!. /he positive terinal of the DC source is connected to a copper band wound on theconductive laer of the sheath at one end of the cable (%3 c awa fro the end).

". /he 2$ '4 tester can be operated b choice either fro the power suppl source of

220,##0 -! (0,60 &.suppl or can be char&in& its in0built batter set0up.

$. #witch on the tier in cloc'wise direction5 a lap indicator will be indicated 6N

position to a desired test period.

%. #elect the volta&e selector switch to ( )' or 2( )'.

. #elect the ran&e of current easureent to position correspondin& to the current

value intended for char&in& the test cable.
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+. #lowl rotate the volta&e selector to the desired volta&e value on the scale (1 '4 per

second in intervals). /atch caref*lly the -oltmeter while charging$If re*uired re0

ad8ust volta&e selector before the desire test volta&e is reached.

-. #et ran&e switch for current easureent to the desire ran&e after char&in& has

been copleted.

13. ?fter the tie has elapsed the hi&h volta&e brin& down to Eero5 switch off the tierand dischar&e the cable throu&h &round wire.

DC Sheath Test diagram

Requirements

/he cable is considered to have passed if it withstands the re*ired -oltage 1#0 )'durin& thetest for # min*tewithout brea' down. Durin& the test5 the lea'a&e current shall be recorded.

Durin& the testin&5 safet re&ulations on electric haEards should be strictl observed. /he

easureents 9 readin& are recorded in the available forat in copan.

=o bac' to Index F

5. Insulation resistance measurement

/he insulation resistanceshall be easured between cond*ctor and metallic screenaccordin&

to I,C %3+"3.
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References

IEC 602290 ,lectric cables /ests on extruded oversheaths with a special protective

function

TE!"!#04$080 ;ondin& and &roundin& of insulated etallic sheath of power cable

sste

Equipment / instruments used

;atter operated 0>G6AI/#@ &igh 'oltage Ins*lation 3esistance Tester5 and


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KYORITSU High Voltage Insulation Resistance Tester

Instructions

1. Cable should be free fro all sste connections2. Connect the cables between conductor and etal sheath.

3.


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Insulation resistance test diagram

/he ins*lation resistance 13ieasured between each individual conductor and etal sheath./he insulation resistance per 'iloeter is calculated fro:

AlH Aix (= >)

/here:

3l Insulation resistance in = >.

3i .

=o bac' to Index F

6. Cross bonding check

ith the cross bondin& chec's5 the ri&ht connection of the cables can be chec'ed and when

correctl bonded5 no c*rrent may flow in the metal sheath of the cable in case of an ideal

sit*ation.

Ideal case is only the case when all cable sections have the same length and the spacing between

the cables is constant along the cable route.But in practice, some induction current will always flow

as the configuration of the cable system is never ideal.
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/he actual site re*uireents and situation dictate what the actual cable section len&ths that a

differ fro section to section.

Equipment / Instruments used

!+3 4 =enerator

!0Phase Current /ransforer

Clap


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=o bac' to Index F

Will be continued soon

URL of technical article at EEP: Test On 110kV Power Cable After Installation (2)
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Test on 110kV Power Cable After Installation

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