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how we have to calculate the short circuit current for
33/11kv 2mva, 7.5% Z, Transformer primary side breaker and
secondary side breaker short circuit current for both sides?.

Answers were Sorted based on User's Feedback



how we have to calculate the short circuit current for 33/11kv 2mva, 7.5% Z, Transformer primary si..

Answer / sunil ulange hit nidasohi

Sort circuit MVA= Rating * 100 / Z%

Short Circuit Current =Short circuit MVA / 1.732* Voltage

Is This Answer Correct ?    7 Yes 3 No

how we have to calculate the short circuit current for 33/11kv 2mva, 7.5% Z, Transformer primary si..

Answer / dipak

Sorry I give a wrong answer above and I realize latter
on.correct answer is
short circuit current=mva/v*z=2000000/33000*.075=808A
or .8kA

Is This Answer Correct ?    6 Yes 7 No

how we have to calculate the short circuit current for 33/11kv 2mva, 7.5% Z, Transformer primary si..

Answer / karuppannasamy

Rated primary current=2000/(1.732*33)=35A
Short circuit current= Rated current/Impedance
= 35/.075=466A
Similarly
Rated secondary current=2000/(1.732*11)=105A
Short circuit current=105/.075=1400A

Is This Answer Correct ?    2 Yes 4 No

how we have to calculate the short circuit current for 33/11kv 2mva, 7.5% Z, Transformer primary si..

Answer / madhu

Fault impedance in secondary Z = %Z x 10 x (KV)²/KVA
= 7.5*10*11*11/2000
= 4.5 OHMS
then fault current in sec = V/(Z*1.732)
= 11000/(4.5*1.732)
= 1411 A or 1.4kA
similarly in primary Z = 7.5*10*33*33/2000
= 40.83
then fault current in prim = 33000/(40.53*1.732)

= 0.466kA

Is This Answer Correct ?    0 Yes 3 No

how we have to calculate the short circuit current for 33/11kv 2mva, 7.5% Z, Transformer primary si..

Answer / dipak

Short Circuit Current=mva/z=2/.075=2.67MA,rating of
transformer is always same for primary or secondary

Is This Answer Correct ?    2 Yes 6 No

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