专利汇可以提供Ground fault detector专利检索,专利查询,专利分析的服务。并且Ground fault protectors commonly use a differential current transformer for sensing ground-fault current, and a level detector causes opening of the load circuit in response to ground-fault current above a tripping level. A current loop develops around the core of the differential transformer in case a fault develops between the ''''white'''' or neutral load-circuit conductor and the ground-return current path, this loop having the effect of reducing the sensitivity of the ground-fault sensing means. A test signal is applied to the differential transformer at frequent short intervals, and tripping of a loadcircuit interrupter results if such reduced sensitivity should develop. The level detector is made less sensitive during application of the test signal, to prevent opening of the load circuit in response to the test signal, but even during the testsignal intervals the level detector remains responsive to greater-than-minimum ground-fault signals. The circuit interrupter opens in case of reduced sensitivity of the ground fault sensing means due to any cause.,下面是Ground fault detector专利的具体信息内容。
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