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    • 5. 发明授权
    • Electronic trip circuit breaker with CMR current sensor
    • 带CMR电流传感器的电子跳闸断路器
    • US5923514A
    • 1999-07-13
    • US964897
    • 1997-11-05
    • Gary W. ScottAndy Haun
    • Gary W. ScottAndy Haun
    • H02H1/00H02H3/00
    • H02H1/0007
    • A current sensor has a closed loop magnetic hoop with a gap and a central aperture for receiving a conductor. An IC chip incorporating a Giant MagnetiResistive (GMR) sensor is positioned in the gap to provide a measure of the current in the conductor. A relatively small current transformer provides the necessary information about the direction of the current to an electronic trip unit for a circuit breaker as well as power supply for the IC chip and the trip unit. The trip unit operates in the presence of AC and DC faults. In a three phase power system, a single GMR chip in the proximity of three closely spaced phase conductors, together with a current measurement from the neutral line, enables trip units to operate on the occurrence of AC and DC faults.
    • 电流传感器具有带有间隙的闭环磁环和用于接收导体的中心孔。 结合了巨磁阻电阻(GMR)传感器的IC芯片位于间隙中,以提供导体中电流的测量。 相对较小的电流互感器提供关于断路器的电子跳闸单元的电流方向以及IC芯片和跳闸单元的电源的必要信息。 跳闸单元在存在交流和直流故障的情况下工作。 在三相电力系统中,在三个紧密相隔的相导体附近的单个GMR芯片以及来自中性线的电流测量使得跳闸单元能够在发生交流和直流故障时工作。