we all know that in transformer, voltage and current are
inversely related i.e. Vp/Vs= Is/Ip....so in standard
CT..we have a ratio of 200/5...that means our voltage
should increase by ratio of 40..althoug that is not the
case...because that requires high insulation level.and
pratically not feasible......can anybody clarify my
ques.......thanx
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Answer Posted / peter b
Current and voltage and still inversely related in a CT.
However, the primary of a CT does not see the full line
Voltage i.e. a CT on a 110kV bus does not have a primary
Voltage of 110kV! The CT's primary is in series with the
main load; the primary voltage of the CT is simply the
induced Voltage due to the AC flowing through the primary.
This Voltage is only a tiny fraction of the full line
Voltage. The only insulation requirement is that the CT as
a whole be insulated from neutral/earth. That's why they
are mounted on long insulators.
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Sir,In our company there are 3 caterpillar make(capacity:(1) 3.3KV,2.5MW(2)3.3KV,2.5MW & (3)3.3KV,1.9MW) & 1 deutz make (capacity:11KV,3.8MW)gas engines utilised,all are running in paralell. There are three transformer utilised,(1) 6.25MVA,3.3KV/22KV,Impedence voltage:6.7% used for two generator,both are 2.5MW(2)5.5MVA,3.3KV/22KV,Impedence voltage:7.2% used for one generator of 2.5MW & (3) 5.5MVA,11KV/22KV,Impedence voltage:7.8% used for one generator of 2.5MW.all generator breakers capacity of 1250Amps. Sir,I want the details of fault level calculation of generator,transformer individually & for whole system. If you require any information from me.feel free for contact me sir.pl.send the answer of my question as the earliest as possible.
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