Apparatus and method for detecting the loss of a current...

Details Apparatus and method for detecting the loss of a current... Apparatus and method for detecting the loss of a current...

2007-03-27

2007-03-27

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transformer protection

C361S035000, C361S063000, C324S546000, C324S547000, C307S134000

Reexamination Certificate

active

11070077

ABSTRACT:
Disclosed is an apparatus and method for detecting a loss of a current transformer connection coupling a protective relay to a power system element of a three-phase power system and providing a plurality of secondary current waveforms of the three-phase power system to the protective relay. The apparatus includes a first logic circuit and a second logic configured to provide corresponding first and second binary signals in response to respective comparisons of calculated current value(s) of a plurality of like-phase digitized current sample streams to respective threshold values. The apparatus also includes a set reset flip-flop having a set input adapted to receive the first and second binary signals to provide a third binary signal. The third binary signal indicates loss of a current transformer connection when the set input is asserted and indicates no loss of a current transformer connection when the reset input is asserted.

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