Answer / manju

the standard output of 11 kv distribution transformer is 440v for line to line and 230v for line to neutral.

Answer / bahadure.kapil

because in the 3-phase supply line voltages concider.

Answer / ajit

Because we can only mesure the voltage line to line .There
is no instrument to measure L-L-L

Answer / jq

So that you can have a 240V for a single phase system, for
use to most of the house hold appliances available in the
market that we use.

Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua

3 Answers  

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