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

Post New Answer

More Electrical Engineering Interview Questions

Which of the following loss varies with the load A hystresis loss B eddy current loss C copper loss D core loss

1 Answers  


how do you select the ct/pt rating in substation

1 Answers   Apollo, Shreem Electric Ltd, Tata Motors,


Can clean earth cable be considered as low current cable

0 Answers  


Why the Motor takes High Current in Starting time?

5 Answers  


Use of electrical theorems (thevenin's,norton's,millmen's,superposition,reciprocity, Maximum Power Transfer theorem,Compensation Theorem) IN REAL LIFE???(IF YOU KNOW EXACT OR CORRECT ANSWER).

2 Answers   College School Exams Tests, L&T, PESIT, Wipro,


why ahould you show client/engineer activities clearly on the project plan

0 Answers  


gd eve frndz my qstn is how convert sound energy to electrical energy

1 Answers   HCL,


what is the range of thermal overload and over current. Answer should be in percentage of current.

0 Answers   RMSI,


what will happen if field winding of Synchronous generators given ac supply

4 Answers  


What is the major difference between P.T. & C.V.T ? Why CVT is used in HT Transmission line in place of P.T.?

13 Answers   APGenco, OPTCL,


what factor is necessary during design of HT & LT MOTORS.

2 Answers   ABB, L&T,


what is the essential resistance of r y b phase short citcuit ? Eg in star connection we doing this kind of short circuit oly

0 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5085)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4452)
  • Electrical Engineering Interview Questions Electrical Engineering (16637)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)