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1. Why CT is always close.?

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Question added by Balakrishnan duraisamy , Lead Electrical Commissioning Engineer , Ponticelli
Date Posted: 2014/07/06
Hammad Ur Rehman Khan
by Hammad Ur Rehman Khan , Shift Control Engineer , TNB Remaco Pakistan Pvt. Ltd. (A wholly Owned Subsidiary of Tenaga Nasional Berhad, Malaysia)

The current transformer secondary is always short circuited, as the secondary of the CT has large number of turns and current is stepped down  from1000 of Amperes to standard1A or5 Ampere. very low current on secondary side but voltage across it is very high and if due to insulation breakdown or any other mishap CT is secondary gets open, It will burst.

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