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Earth leakage tester, earth leakage circuit breaker equipped with the same, circuit breaker, and insulation monitor
Earth leakage tester, earth leakage circuit breaker equipped with the same, circuit breaker, and insulation monitor
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机译：漏电测试仪，配备该漏电测试仪的漏电断路器，断路器和绝缘监测器
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摘要
An earth leakage tester (300) generates a test signal for detecting an operation of an earth leakage detector (200) that detects an earth leakage current resulting from insulation resistance to earth from an output of a residual current transformer (3) inserted in an AC circuit (1). The earth leakage tester(300) includes a test signal generation portion(12) that generates, as the test signal, a signal having a same cycle as a voltage of the AC circuit and of which phases are switched selectively according to a wire system of the AC circuit. It is therefore possible to obtain an earth leakage tester(300) built into an earth leakage detector (200) that detects the earth leakage current resulting from insulation resistance to earth, an earth leakage circuit breaker equipped with the earth leakage tester (300), a circuit breaker (400), and an insulation monitor (500).
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