H - Electricity – 02 – J
Patent
H - Electricity
02
J
H02J 13/00 (2006.01) H02H 7/04 (2006.01)
Patent
CA 2537063
The main object of the invention is a method of supervising the operation of a plurality of current transformers arranged in respective groups and connected to a protection relay forming part of a three-phase electrical power system, comprising the steps of: (i) determining a current ratio at an output of each group of current transformers; (ii) comparing each current ratio with a predetermined high ratio; (iii) comparing each current ratio with a predetermined low ratio; and (iv) generating a fault indication when the current ratio at one location exceeds the predetermined high ratio and the current ratio at the or each other location remains below the predetermined low ratio. Another object of the present invention is a protection relay.
Areva T&d Uk Limited
Goudreau Gage Dubuc
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