1.) A three phase transformer having a line voltage ratio of 400/33000 v is connected in the star-delta. The cts on the 400v side have a ct ratio of 800/5. What must be the ratio of cts on the 33000 side?

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1.) A three phase transformer having a line voltage ratio of 400/33000 v is connected in the star-delta. The cts on the 400v side have a ct ratio of 800/5. What must be the ratio of cts on the 33000 side?

 

2.) A 100 mva delta/wye connected, 11/220 kv transformer is to be protected by percentage differential scheme ct used are of ratio 6000:5 and 300:1 respectively. Relays are rate yp to 1A. Determine the current at ICTHV

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