Answer / gunasekaran

if transformer getting saturation we cannot get magnetic
balace and it draw more magnetising current.if u applie 50%
rrated voltage saturation may be released. if u applie dc
current more than 10% of the magnetising current
transformer may be saturated that is y we r appilie less
current at the time of winding resistance. another one
method if u have sfra test kit u can find it out

Answer / k.prakashchandra

Ask for manufacturers' test reports in which saturation
current of the CT is made available.For CTs with primary
winding you apply small voltage using step down transformer
and variable auto-transformer and measure the saturation
current when the secondary current ceases to increase and
then applying the ratio.For ring type, you have to boost
the current in the cable.Saturation current is usually
higher than the rated current

Answer / k.prakashchandra

Ask for manufacturers' test reports in which saturation
current of the CT is made available.For CTs with primary
winding you apply small voltage using step down transformer
and variable auto-transformer and measure the saturation
current when the secondary current ceases to increase and
then applying the ratio.For ring type, you have to boost
the current in the cable.Saturation current is usually
higher than the rated current

at work we have a 3 phase motor but on testing one phase isnt getting a reading. it runs 24 hours a day all week. stops and starts well no noise or heating. the phase isnt down to earth.is it just a bad meter reading or not? phases one and three came up with a resistance reading of 0.4 but phase 2 couldnt get anything shows up as open circuit.

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