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how to calculate restraing current and operating current
for differential protection if 20 mva transformer is OLTC
33 kv/11 kv ? and what should be the type and ratio of CT?
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Answer Posted / nur.asidik
let call Irestrain as Itot, because different relay have different characteristic to define Ires.
for micom P54x, Itot =(|I1|+|I2|)/2,
for sepam T87, Itot =Max(|I1|,|I2|)
where I1=primary current
I2=secondary current,
it need to be consider to calculate transformer ratio factor
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