Earth leakage protective relay
    9.
    发明授权
    Earth leakage protective relay 失效
    漏电保护继电器

    公开(公告)号:US6025980A

    公开(公告)日:2000-02-15

    申请号:US131613

    申请日:1998-08-10

    IPC分类号: H02H1/04 H02H3/33 H02H3/00

    CPC分类号: H02H1/04 H02H3/33

    摘要: An earth fault detection circuit employs a differential current transformer and burden resistor to sample circuit current for potential earth fault current. A second order low pass filter circuit is employed to filter out harmonics within the protected circuit and a time delay circuit is used to insure the occurrence of a true earth fault leakage condition. A circuit with an operational amplifier is used to create a symmetric power supply for the rest of the circuits from a full wave rectified AC source.

    摘要翻译: 接地故障检测电路采用差分电流互感器和负载电阻对电流接地故障电流进行采样。 采用二阶低通滤波器电路来滤除受保护电路内的谐波,并且使用时间延迟电路来确保发生真实的接地故障泄漏状况。 使用具有运算放大器的电路从全波整流AC电源产生用于其余电路的对称电源。