For polarity test on a 11/3.3kV 2.5MVA delta-star Unit Auxiliary transformer,415V 3-phase supply was applied at the HV. Connection between Aa was made with a 2.5mm cable. As soon as power was switched on the cable caught fire and burnt. This test was then abandoned. It is noteworthy to say that a similar cable was also used in a similar transformer for the same. The cable did not burn and test was successfully completed with good result. What is wrong? Please, help me out.
3 Electrical Engineering 6434
Question { 11076 }
why neutral of 6.6 kv star connected sq. cage induction
motor does not get earthed, though for earth fault
protection it is must.
Answer
Is This Answer Correct ? | 2 Yes | 4 No |
Question { 8792 }
i have 28/32 MVA power transformer with 11/6.6 KC voltage
rating and 12%impedance.it have star connection at both
side.but it have another thied winding tertiary
winding.what is used of this winding.
pl tell me
Answer
Is This Answer Correct ? | 0 Yes | 1 No |
What core magnetic balance test of transformer?
How to do this test in a three phase Star delta (star-LV,
Delta-HV) transformer?
How to measure and where to measure?
thanks and regards
Austin
Answer
Is This Answer Correct ? | 6 Yes | 4 No |
Question { 8412 }
if step down transformer step down the voltage,will current
will also be proportional step up. If yes then how
transformer handle such a large current?
Answer
Is This Answer Correct ? | 9 Yes | 0 No |
Question { 8412 }
if step down transformer step down the voltage,will current
will also be proportional step up. If yes then how
transformer handle such a large current?
Answer
Is This Answer Correct ? | 0 Yes | 0 No |
Question { Power Grid, 9894 }
IN bateery size of positive is biger than negative .why?
Answer
Is This Answer Correct ? | 5 Yes | 4 No |
What is the difference btwn grounding and earthing?
Answer
Is This Answer Correct ? | 1 Yes | 0 No |
Question { 3517 }
In a distribution system,having 3phases & 1 nuetral.ecah
phase to neutral is 230V,line-line voltage is 440V,but what
is the voltage of each line.but it should obey the KVL law.
Answer
Is This Answer Correct ? | 6 Yes | 1 No |
Question { Engineers India Limited, 5278 }
A 25MVA 3300/400V T/F is termed as per winding is ……
a) primary 3300V & Secondary 400V
b) primary 3300V & low voltage winding 400V
c) High voltage winding 3300V & Secondary 400V
d) High voltage winding 3300V & low voltage winding 400V
Answer
Is This Answer Correct ? | 3 Yes | 1 No |
Question { 5513 }
why bucholtz relay placed inclined in transformer?
Answer
Is This Answer Correct ? | 10 Yes | 4 No |
Question { 6434 }
For polarity test on a 11/3.3kV 2.5MVA delta-star Unit
Auxiliary transformer,415V 3-phase supply was applied at
the HV. Connection between Aa was made with a 2.5mm cable.
As soon as power was switched on the cable caught fire and
burnt. This test was then abandoned. It is noteworthy to
say that a similar cable was also used in a similar
transformer for the same. The cable did not burn and test
was successfully completed with good result. What is wrong?
Please, help me out.
Answer
Is This Answer Correct ? | 0 Yes | 0 No |
What is the major difference between P.T. & C.V.T ? Why CVT
is used in HT Transmission line in place of P.T.?
Answer
Is This Answer Correct ? | 174 Yes | 18 No |
Question { 126841 }
What is the difference between a Junction Box and a
Marshalling Box?
Answer
Is This Answer Correct ? | 93 Yes | 28 No |
Question { 11064 }
Why earthing transformer used in Distribution Sub-Station?
Answer
Is This Answer Correct ? | 12 Yes | 3 No |
Question { 11064 }
Why earthing transformer used in Distribution Sub-Station?
Answer
Is This Answer Correct ? | 8 Yes | 1 No |