Answer Posted / rasaannamalai e

According to the Transformer theory..The formule is
E1/E2=N1/N2=I2/I1=K..In CT Primary Turns is Only one ie.Bus
bar.But the secondary turns is more depends upon the ratio
which we choose..From that we can say it is stepup
transformer when it is in opened secondary...
for example 1000/1A ,415v what will be the secondary
volage in Opend secondary CT.
Let's see
I1=1000A,I2=1A,E1=415,N1=1turn,N2=? and E2=?

1/1000=415/E2
E2=415*1000
E2=415kv....This much voltage get induced in CT
secondary due to Induced emf.
And,
E1/E2=N1/N2
415/415k=1/N2
N2=415k/415
N2=1000Turns.
From the above answer we can say CT is Stepup
Transformer..If it gets open during load condition it get
saturate or Blast because of very high heat and less
Iinsulation.

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