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    • 5. 发明公开
    • Ground fault detection system and method
    • Erdschlussüberwachungssystemund Verfahren
    • EP2386439A3
    • 2013-02-20
    • EP11176909.7
    • 2003-02-19
    • BAE Systems Controls Inc.
    • Roden, Garey GeorgeCarruthers, Peter Alexander
    • B60L3/00G01R31/02B60W10/08B60W20/00B60W50/02B60L3/04
    • G01R31/025B60L3/0061B60L3/0069B60L3/04B60L2200/26B60W10/08B60W20/00
    • An AC ground fault detector system for sensing an AC signal indicative of an unintended electrical path between a load driven by a power source and a reference potential comprises a first power conductor coupled to a first terminal of the power source and a second power conductor coupled to a second terminal of the power source. A switching mechanism coupled to the first and second power conductors is operative for alternately connecting a phase of the load with the first and second power conductors according to a predetermined switching rate, whereby, during normal operation, voltages developed at the first power conductor and second power conductor are substantially constant with respect to a reference potential. In the event of an occurrence of the unintended electrical path of at least one phase of the load with the reference potential, time varying voltages are developed at the first power conductor and second power conductor associated with the switching rate. A detector is coupled at an input port to the first power conductor for receiving the voltage or current signal on the first power conductor.
      The detector includes a processing circuit for processing the received signal and comparing with a threshold value, and an output port for generating an output signal based on said comparison; whereby the occurrence of the unintended electrical path between the load and reference potential causes a change in the voltage or current signal on the first power conductor of sufficient magnitude relative to the threshold value for detection by the detector such that the output signal of the detector is indicative of a detected fault.
    • 用于感测指示由电源驱动的负载与参考电位之间的非预期电路径的AC信号的AC接地故障检测器系统包括耦合到电源的第一端子的第一电力导体和耦合到 电源的第二端子。 耦合到第一和第二电力导体的切换机构可操作用于根据预定切换速率交替地将负载的相位与第一和第二电力导体连接,从而在正常操作期间,在第一电力导体和第二电力导体 电源导体相对于参考电位基本恒定。 在发生具有参考电位的负载的至少一相的非预期电路的情况下,在与开关速率相关联的第一电力导体和第二电力导体处产生时变电压。 检测器在输入端口处耦合到第一电力导体,用于接收第一电力导体上的电压或电流信号。 检测器包括用于处理接收信号并与阈值进行比较的处理电路和用于基于所述比较产生输出信号的输出端口; 由此在负载和参考电位之间出现非预期的电路径导致第一电源线上的电压或电流信号相对于阈值足够大的变化,以便由检测器检测,使得检测器的输出信号为 指示检测到的故障。