Answer Posted / selvam.s

Protection CT:

this type of CT can be used for protect the breakers.

5P10,5P15 & 5P20 are called protection current transformer

1) 5 means accuracy of sensing fault current
2) 'P ' means "protection"
3) 10,15 & 20 means ( no.of times ( 10,15 &20 ) X actual
current rating of breakers .

PS CT:

PS means protection special current transformer.

this type CT can be used for differential protection in
transformer & in alternator.

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