How can we calculate the fault level of the distribution
system knowing the percentage impedance of transformer &
subsequent equipments.

Answers were Sorted based on User's Feedback



How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / kaustubh

if we known the pesentage of impedance then by using this
formula we can calculate the fault Lavel.

fault lavel in MVA= Rated KVa/% of Impedence

OR

Fault Lavel= 1.732xFault Currentx Rated Voltage

Is This Answer Correct ?    146 Yes 38 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / gopal

fault lavel in MVA= Rated power/% of impedence


or

Fault Lavel= 1.732xFault currentxRated Secondry Voltage

Is This Answer Correct ?    69 Yes 28 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / mukul

Dear friends above answer is wrong when you are using
transformer KVA in you calculations then pf is not required
the above answer can be corrected by omitting pf from this calcs

Is This Answer Correct ?    44 Yes 5 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / amar singh.

fault level depend on system impedance
full load current*100
Trasformer fault level= ----------------------------
%impedance of the transformer

Is This Answer Correct ?    51 Yes 17 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / pankaj

THERE IS A SIMPLE CALCULATION IF ASSUMING INFINITE SOURCE
BUS THE MAX LEVEL OF FAULT AT LT SIDE OF A 11/0.433 5%
1000KVA TRANSFORMER CAN BE CALCULATED AS:

KVA*100/SQRT3*433*Z% kAMPS

1000*100/1.732*433*5 = 26.7kAMS

Is This Answer Correct ?    39 Yes 7 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / k n naidu

hi,
Calculation of fault level of a distribution net work of
complex in nature manually is laborious. Use network
analyser for simulating the network and fault at the
required bus to get the fault current.
for manual calculation use the MVA method which is
simple and gives fairly acurate results

Is This Answer Correct ?    23 Yes 7 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / leonard

Fault level = Rated Voltage / system impedence (up to that
point)

transformer impedance can be calculated using the
following formula:

Z(transformer)=(Vsq*Z%)/(P*100)

where
Ztransformer is the source transformer impedance, in ohms;
P is the power of the transformer, in volt amperes;
Z% is the rated short-circuit impedance voltage of the
transformer, expressed as a percentage.

Is This Answer Correct ?    7 Yes 4 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / abhi

Fault level = (Rated power of transformer*100)/(percentage
impedance of transformer + imp of subsequent equipments)

Is This Answer Correct ?    5 Yes 3 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / jojo

rated capacity of transformer divide by its transformer
impedance.

Is This Answer Correct ?    2 Yes 1 No

How can we calculate the fault level of the distribution system knowing the percentage impedance o..

Answer / avatar

When deciding the fault levels, isnt there a time component
as well? I have seen the fault levels being designated
as "350 MVA @ 1 sec". What does this mean? Please help.

Is This Answer Correct ?    3 Yes 3 No

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