Answer / amit khamesra

Conventionally only PS class CT shall be used for unit
protections. But now a days, with the use of miro processor
based relays having facility of low impedance or biased
differential protection, 5P20 may be used as biasing in the
relay takes care of the unmatched characteristics of the
both side Cts.

Answer / avdhesh

Class 5p20 CT is a protection class CT which is used for
normal protections. For differential protection you must
use class PS CT.

Answer / persistence

yes 5P20 class CT can be used for differential
protection,In our industry they have been used for
transformer differential protection,transformer being 10 mva
and for bus differential protn. class PS has been used.

Answer / dharmaraj

For diff.protn you must use ps(or) px class CT.

Answer / dheena hitech

For diff protection we should be use PS or PX class Because
of yjat one ine is spl. class for diff and Dist protection

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