Detailed Product Description

Protective current transformer are required to operate over a range of current many
times the circuit rating and is frequently subjected to conditions greatly exceeding
those which it would be subjected to as a measuring current transformer.
When a current transformer is used to energise a protective relay, it must manintain
its characteristic ratio up to some multiple ofits rated current. This multiple,
may be 5, 10, 20 or some even higher value and is know as the ccuracy Limit
Factor?(ALF). Therefore, the selection of Proterctive Current Transformers in
relation to accuracy class and ALF require a close examination of relay characteristic
and circuit conditions which inclues the relay burden and the pilot wire
lead burden.