Answer Posted / nithi

when SEC of the CT open circuited,
1.high-voltage buil-up in the sec side
2.core saturation-over heat-result in fire(if
prolonged).
these things will not happen in ordinary
transformer.because,
PRIMARY CURRENT IS REFLECTION OF SECONDARY
CURRENT.SO,WHEN THERE IS NO CURRENT IN sec SIDE,ONLY NO-
LOAD CURRENT WILL FLOW IN PY WINDING.BUT IN CASE OF CT,PY
CURRENT IS INDEPENDENT.SO,IF SEC OPENED,NO DE-MAGNETISING
EFFECT &FORCED TO OVERFLUXING CONDITION.

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