SIS - ECODIAL 3.3- 2004 - English 1

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1. INTRODUCTION

Ecodial 3.3x :

z 98 SE, Win 2000, XP

z Included :z Contactors , Circuit breakers (Telemecanique),z Thermal relays, Soft starters, Variable speed drives,

Capacitors

Calculation method : CENELEC (R0064-003) Installation rules : IEC364, C15-100 (new version), BS7671

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Installation rules address all the issues relative to safety : overload protection minimum cable sizes protection against direct and indirect contact short circuit protection

These rules are usually all based on the same inital document (IEC60364), onto which each country usually includes local requirements (temperature, safety, cable derating).

What are installation rules ?IEC60364, NFC 15-100, BS7671, CP5, AS3008, ...

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Ecodial is a low voltage network calculation tool.

It can calculate simple arborescent type networks no loops/ring feed systems

Ecodial calculates cable cross section based on

upstream protection setting, maximum allowable voltage drop, protection against indirect contact,

short circuit currents according to : type of short circuit, polarity of circuit and earthing method

sets protection devices based on short circuit currents, expected loads, ...

What is Ecodial ?

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Ecodial is not : A medium voltage design tool A tool that can be used lightly : professional engineers must check verify and

certify these results The solution to all the possible design problems that one may encounter.

Ecodial cannot solve all the layouts Several studies could be made... Simplified network should be drawn...

What Ecodial is not :

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General characteristics- definition of the global parameters (voltage, earthing, )

Drawing- definition of the network layout

Definition of circuit characteristics- definition of the terminal load, and all the cable lengths

Power sum- calculation of the required power, and current in the distribution circuits

Calculation- sizing of cable, calculation of short circuit currents, choice of equipment,

Results- printout of the input / output used for the calculations

The main steps of an Ecodial study

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Un Ph-Ph (400V) : sets the LV network voltage. This value corresponds to a phase-phase voltage

Earthing arrangement (TNS) : sets the earthing arrangement at the transformer. This value can only be changed in a network after an LV/LV transformer, or from TNC to TNS.

Cascading (YES) : authorises Ecodial to use reinforced breaking capacity to choose downstream breakers. This can help reduce the cost of an installation.

Discrimination (standard) : displays the discrimination results and chooses breakers giving better discrimination results.

Smax (240mm) : sets the maximum cable CSA that Ecodial can use when sizing cables (multiple cables in parallel can always be used though)

General characteristicsCalculation / General characteristics

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CSA N / CSA Ph (1) : sets the minimum ratio between phase and neutral conductors. This is used to allow half neutrals (1/2) or require full neutrals (1).

Tolerance (5%) : Ecodial calculates the theoretical Phase CSA. Tolerance can be included to allow the choice of cable slightly smaller than the theoretical value.

Target power factor (0.96) : this is the value Ecodial will use to size the required capacitor bank. It corresponds to the power factor downstream of the transformer.

System frequency (50Hz) : enables users to choose products that are suitable for 60hz applications (capacitors, ).

Thermal stress compliance (No) : enables Ecodial to check out that cables chosen are in compliance with thermal stress under short circuit.

General characteristicsCalculation / General characteristics

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New with 3.35 ! One will be able to modify some of these characteristics afterwards. Ecodial

will then ask whether the modified characteristic should be spread abroad down the electrical network or not. This function can be quite useful in case the user is looking quickly for the results of a variant of its own design

General characteristicsCalculation / General characteristics

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Sources : Transformer, Generator, Undefined, (Bus coupler) Busbar : Busbar, Truncking

Feeders circuits

Loads : receiver, motor, lighting, variable speed drive

LV / LV transformers (isolating, step-up, step-down)

Miscellaneous : graphic links - project links

Drawings: Interlock

Standard diagrams

Drawing the network - the symbol toolboxDisplay / Symbol Toolbox

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Drawing the network

Click on the symbol you wish to use: the mouse pointer becomes this symbol

Click on the diagram where you wish to place the circuit Ecodial verifies if this circuit can be placed there (if there is room, etc)

Double- click on the circuit, and define : Name Characteristics (cable length, polarity, etc) Customise (cable busbar trunking, circuit breaker fuse, )

Validate

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B2

Switchboard

Q1

Source

C1

T1

Q5

Main lighting

C5

D5 Main lighting

E5

Q4

K4

Main motor

C4

M4

Q3

Main Load

C3

L3

The first study

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select circuit and (F4), or double-click on circuit Name all the circuits :

Supply, Switchboard, Main Load, Main Motor, Main Lighting Enter circuit parameters:

Main Load : 35m, 238A Main motor : 39m, 110kW (mechanical), Main Lighting :15m cable, 30m busbar, 20x150W Incandescent

lights, 10 identical circuits

Useful tools Network / Item lists

faster input of circuit characteristics once the circuits are named. Network / Logical check (F3)

Definition of circuit characteristicsNetwork / Circuit description

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Automatically calculates the theoretical power of transformer and generator. (400kVA)

Automatically calculates the currents in the different branches of the circuits. (ex Total Switchboard feeders = 436.36A)

Ku and Ks coefficients can be used to optimise design.

Ecodial will recommend a transformer size.

Power sum should be run after every modification !

The Power SumCalculation / Power Sum

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Ku : usage coefficient applicable to a CIRCUIT % full load current when load is running example :

motor +/- 80% Light 100%

Ks : diversity coefficient applicable to a DISTRIBUTION BOARD chance of all feeders drawing maximum load at any given time relative to the number of feeders on DB. See Electrical Installation Guide (B-16)

Power sum, Ks and Ku

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Apartment blocks :Consumers 4 9 14 19 24 29 34 39 49Ku 1 .78 .63 .53 .49 .46 .44 .42 .41

Distribution Boards (IEC439) :Circuits 3 5 9 10+Ks .9 .8 .7 .6

Circuits (Ks or Ku ?): Lighting 1 Heating, air conditioning 1 Socket outlet circuit .1 to .2 (higher in industry) Lifts/hoists 1 / .75 / .6

Calculation parametersDiversity and usage coefficients - example

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Problem with Ku and Ks Responsibility of the user Personal experience Knowledge of installation Database of existing installations

Advantage of Ku and Ks more cost effective installation not oversized Example

total installed power : 144kVA maximum expected demand : 80 kVA

Calculation parametersDiversity and usage coefficients - example

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Ib is the maximum current potentially consumed by the load.

Therefore, Ecodial makes sure to take the worst case if considering the maximum Ib.

Ib will size the frame and the overload protection of the protective device.

Consequently Ecodial does not consider the Ku input for the load.

In three phases system :

In single or bi phase system cosNPhkW

b UPI

=

cos3 PhPhkW

b UPI

=

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Ku is a user coefficient. If the user knows is equipment load will be only 80% of the nominal current, he should input 0.8. These kind of assumptions are quite common for motors.

Ku is not used to size the macro component. He is taken into account to size the upstream circuits

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154.64 36.24>

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154.64

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154.64240.86110.94

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154.64240.86110.94

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The power required is equal

In three phases system

In single phase system

In Bi phases system

m is the Voltage coefficient that is requested to alleviate Voltage fluctuation. Standards has fixed it to m = 1.05

3bPhPhkVA ImUP =

bNPhkVA ImUP =

bPhPhkVA ImUP =