H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/28, 324/67
H02H 3/26 (2006.01) H02H 1/04 (2006.01) H02H 3/50 (2006.01)
Patent
CA 1324207
-18- Abstract of the Disclosure A predetermined unsymmetry of a bipolar waveform is detected by apparatus which includes a circuit which generates a pulse for each zero crossing of the waveform. Each zero crossing pulse triggers a first retriggerable one- shot for a first interval T1. Timing out of the first one- shot triggers a second retriggerable one-shot for a second interval T2. If both the first and second one-shots have timed out a third one-shot is triggered for a third interval T3. The intervals are selected such that twice T1 plus T2 is equal to the period of one cycle of the bipolar waveform so that triggering of the third one-shot is an indication of a predetermined unsymmetry determined by relative values of T1 and T2 of the bipolar waveform. T3 is selected such that two symmetrical cycles of the bipolar waveform are required to clear the unsymmetry indication. The apparatus is applied to blocking a false trip signal from a reverse current relay in response to the in-rush current when a transformer is energized with little or no load.
604342
Swabey Ogilvy Renault
Westinghouse Electric Corporation
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