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    • 10. 发明授权
    • Circuit protection arrangements using ground fault interrupter for
overcurrent and overvoltage protection
    • 使用接地故障断路器进行过流保护和过电压保护的电路保护装置
    • US5745322A
    • 1998-04-28
    • US563321
    • 1995-11-28
    • Hugh DuffyJustin ChiangJohn MidgleyBrian Thomas
    • Hugh DuffyJustin ChiangJohn MidgleyBrian Thomas
    • H02H3/16H02H3/10H02H3/33H02H3/38
    • H02H3/334H02H3/105
    • An electrical protection system which uses a ground fault interrupter (GFI) to protect a circuit from (A) ground faults and (B) overcurrents and/or overvoltages. For overcurrent protection, a control element may be coupled in series with the line or return input to the GFI, and a bypass element may be coupled in parallel with the control element and the GFI. In case of an overcurrent, the control element causes current to be diverted through the bypass element, thereby creating a current imbalance in the GFI circuitry causing the GFI to open the circuit. For overvoltage protection, a bypass element (e.g. a varistor) may be coupled between, e.g., the line sense input of the GFI and the return sense input of the GFI. In case of an overvoltage, the bypass element conducts current, thereby creating a current imbalance in the GFI circuitry causing the GFI to open the circuit.
    • 一种使用接地故障中断器(GFI)来保护电路免受(A)接地故障和(B)过电流和/或过电压的电气保护系统。 对于过电流保护,控制元件可以与GFI的线路或返回输入串联耦合,并且旁路元件可以与控制元件和GFI并联耦合。 在过电流的情况下,控制元件使电流通过旁路元件转移,从而在GFI电路中产生电流不平衡,导致GFI打开电路。 对于过电压保护,旁路元件(例如变阻器)可以耦合在例如GFI的线路感测输入和GFI的返回检测输入之间。 在过压的情况下,旁路元件导通电流,从而在GFI电路中产生电流不平衡,导致GFI打开电路。