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AN APPARATUS AND METHOD FOR DETECTING THE LOSS OF A CURRENT TRANSFORMER CONNECTION COUPLING A CURRENT DIFFERENTIAL RELAY TO AN ELEMENT OF A POWER SYSTEM.
AN APPARATUS AND METHOD FOR DETECTING THE LOSS OF A CURRENT TRANSFORMER CONNECTION COUPLING A CURRENT DIFFERENTIAL RELAY TO AN ELEMENT OF A POWER SYSTEM.
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机译:一种用于检测耦合电流互感器与电力系统元件的电流互感器连接损耗的装置和方法。
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摘要
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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