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Ground fault protection apparatus and method of operation that, solar power system and solar power system for an inverter that had this had this
Ground fault protection apparatus and method of operation that, solar power system and solar power system for an inverter that had this had this
PROBLEM TO BE SOLVED: To prevent unnecessary stoppage of a sunlight power generation system by providing a means which outputs a gate block signal to a gate block means, and a break command signal to a mechanical breaking means to load, individually, when a ground fault occurs inside a solar cell array. ;SOLUTION: A detection means 1 and a first continuance confirmation means 2 output a gate block signal from a gate block signal production means 3 to a gate block means when they detect the ground fault occurring continuously for a first specified period. Then, when a ground fault is detected again in the detection means 1 and the second continuance confirmation means 4 after the passage of the second period longer than the first period, a break command signal is given to a mechanical breaking means from a break signal production means 5, judging that it is faulty. When the ground is not detected once again, the gate block signal is canceled. As a result, malfunctions decrease, and high reliability can be obtained even in a long time operation.;COPYRIGHT: (C)1999,JPO
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