What will Happened if the polarity of CT is changed?
Answers were Sorted based on User's Feedback
Answer / jk
Dear MMK. What's wrong UR posting. Ammeter reading from
left to right(0 to 90DEgree). It's starting point is
leftside only. then how it possible.
I think, for messuring CT it may work. but in
cause of protection CT, defenitly it will cause for
tripping the relay & system
| Is This Answer Correct ? | 9 Yes | 0 No |
Answer / k.prakashchandra
Only the meters which require voltage input also show the
negative readings.Directional and distance relays(on reverse
zone) trip.
| Is This Answer Correct ? | 8 Yes | 1 No |
Answer / sanjay sharma
It is depend on type of scheme, in protection , if three phase ckt then reversal of 1 CT polarity relay will (if set value Reach), reversal of all three phases will not effect for normal protection (except to directional protection). In case of metering Ameter will not effect, but energy meter will not work,if single CT reverse in case of three phase, mode (import/export) will change.
| Is This Answer Correct ? | 6 Yes | 2 No |
Answer / chadu
CT refferce to current transformer to sence the current.
if u reverse the ct treminals ur the same current reading
but with opposite polararity.
| Is This Answer Correct ? | 5 Yes | 4 No |
Answer / aggarwala111
Ammeter show the opposite reading as previous.
| Is This Answer Correct ? | 4 Yes | 4 No |
Answer / grg
If we reverse the polarity the relay will see reverse
direction.The protected zone will get reversed.(incase of
distance protection)
| Is This Answer Correct ? | 2 Yes | 2 No |
Answer / sanj
CT polarity is vital part. if polarity changes of any ct out of 3 impact will be there both for measuring and protection ckt.
For measuring ckt please watch
https://www.youtube.com/watch?v=FqLVEeoaXws&t=181s
and for protection ckt impact watch
https://www.youtube.com/watch?v=p-cuvTe8sX8&t=129s
| Is This Answer Correct ? | 0 Yes | 0 No |
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