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METHOD FOR DISCRIMINATING DC VOLTAGE APPLIED TO AC ELECTRIC LINE, METHOD FOR ELIMINATING THE DC VOLTAGE, AND APPARATUS FOR PREVENTING POTENTIAL RISE ON AC ELECTRIC LINE DURING LINE-TO-GROUND FAULT
METHOD FOR DISCRIMINATING DC VOLTAGE APPLIED TO AC ELECTRIC LINE, METHOD FOR ELIMINATING THE DC VOLTAGE, AND APPARATUS FOR PREVENTING POTENTIAL RISE ON AC ELECTRIC LINE DURING LINE-TO-GROUND FAULT
PROBLEM TO BE SOLVED: To allow easily determine whether a DC voltage is applied onto an AC distribution line so as to quickly restore a DC device which does not operate although not abnormal after a line-to-ground fault.;SOLUTION: Each phase on the secondary side of a transformer of the high voltage three-phase AC distribution line 1 is grounded through a capacitor 2. When the DC device is used on the load side of the line 1 and electrical problems occur on the load side and the DC device is not abnormal but does not operate, a DC voltage meter or a half-wave rectifying voltage meter 4 is connected to the AC distribution line 1. When a rated voltage or more is measured and the measured voltage is attenuated with time, it is determined that the DC voltage is applied to the AC distribution line 1.;COPYRIGHT: (C)2003,JPO
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