Two CTs 1600/1 and 35/1 are in series. while checking the ratio test of a CT(1

Two CTs 1600/1 and 35/1 are in series. while checking the
ratio test of a CT(1600/1),same 1600A will also pass
through the CT having ratio 35/1.
Will it be harmfull to the ct(35/1),if yes , what will
happen.CT secondary is shorted

Question Posted / s d gupta

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Two CTs 1600/1 and 35/1 are in series. while checking the ratio test of a CT(1600/1),same 1600A wi..

Answer / ullas

if 1600 ampere current is passed through the second ct
having turn ratio 35/1 the definitely it will be
damaged.,since the ratio test equipment takes few seconds
to indicate the ratio error the condition will be worst .
no doubt.
each ct have certain burden value indicated on it as 10va,
15 va etc.
consider the case of 35/1 ct. hhaving burden 10VA.
this means while 35A is passing through the primary 1A is
produced in the secondary. and and this current can create
a potential up to 10V.
then calculate the value of secondary current curresponts
to 1600A primary current.
the primary of 35/1 ct is not designed to meet 1600A. so it
shall be burn out.
if we keep the two cts as series connected and 35/1 cts
secondary shorted. then also primary winding of the 35/1 ct
will not withstand with the 1600A.( it will simply act as a
conductor because there is no secondary.

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Two CTs 1600/1 and 35/1 are in series. while checking the ratio test of a CT(1600/1),same 1600A wi..

Answer / nur.asidik

refer to IEC, CT can withstand for 1s if current at primary is 1000xIn, mean 35kA is maximal. saturated or not is depend on Rct and burden, need to be calculated

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Two CTs 1600/1 and 35/1 are in series. while checking the ratio test of a CT(1600/1),same 1600A wi..

Answer / s ramar

The ratio is nominal one. The CT is required to measure
fault current which is very high. So nothing will happen to
the CT when 1600 A flows in the primary.

Is This Answer Correct ?

0 Yes

1 No

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