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
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 |
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 |
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 |
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 |
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 |
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 |
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 |
Answer / jojo
rated capacity of transformer divide by its transformer
impedance.
Is This Answer Correct ? | 2 Yes | 1 No |
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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