Why CT Secondary Should never be Kept Open

[@sambashiva1143]

Sir super Explanation with circuit diagram is amazing and knowledge gain video i have doubt on CT example one CT 2000-1500-1000-8000/5 is S1, S2, S3, S4, S5 terminals but we use S2-S4 what about remaining terminals are short circuited or just leave it(do not anything) sir we expected from you more more on like this type videos electrical related

[@relayprotectionelectrical]

For this 5 terminal CT if you use CT ratio 2000/1 then use terminal S1 and S5 , if u use 1500/1 use terminal S1 and S4 , if u use 1000/1 then use use S1 and S3 and if u use 800/1 then use S1 and S2 terminal keeping other terminal left.

[@himanshu2232]

सर अगर ct में 3,या 5 secondary terminal है तोह क्या सभी terminal को short करना होता है या नहीं?

[@relayprotectionelectrical]

Not necessarily. For e.g. CT ratio is 1000-800-400/1 means in secondary ct have 4 terminal S1, S2, S3, S4. If you use 400/1 ratio then S1-S2 terminal required, if you use 800/1 then connect S1-S3 and if you use 1000/1 then connect S1-S4. If any spare core available then you may short either the terminal in which you use for other core or you may short S1 to S4 and again if all the terminals are shorted then there is no problem. If any spare core available then this spare core must be shorted.

[@Rajivkumar12345S]

Sir you are explanation is very informative . I have one doubt regarding CT accuracy class . What is 1Fs3 and 1Fs5 ?

[@relayprotectionelectrical]

Can you please send me the name plate details. Because I have not seen class like 1Fs3 or 1Fs5 . Whether it is for metering or protection core .

[@lankasatyavathi9957]

Prepare first thoroughly and explain.wort explanation

[@relayprotectionelectrical]

Thank you for your feedback. I will try my best to improve in future.