Answer / kkb2003

for ac supply the surface resistance of a body is more
than inner.Due to skin effect the resistance of a body for
a.c supply is more than d.c supply.generally R (a.C)=1.1
to1.3 times of R (d.c)

Answer / saravanan

In a solid conductor, as the radius increases the
resistance also increases to outer surface.Inner surface
has lower resistance than outer.since ac is fluctuating,
the current concentrates more on low resistance region
(inner).so that there is less current flow in outer
surface.This phenomenon is called skin effect.

why r we using vaccuum circuit breakers in the place of m.o.c.b.

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1 amp means-how many electron flow per second. ?

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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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. Draw the vector diagram and condition for the following: 1) Dyn1 2) Ynd0 3) YnYn0

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how to set the transformer differential relay

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