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    • 9. 发明授权
    • Trip unit providing short circuit zone location detection, electrical switching apparatus and system including the same
    • 提供短路区域位置检测的跳闸单元,包括其的电气开关装置和系统
    • US08514531B1
    • 2013-08-20
    • US13419776
    • 2012-03-14
    • Xin ZhouEngelbert Hetzmannseder
    • Xin ZhouEngelbert Hetzmannseder
    • H02H3/00
    • H02H7/30H02H1/0076
    • A trip unit includes a current sensor to sense a value of current flowing through a conductor, a circuit to receive first frequency pulses having a number of first frequencies from the conductor, a transmitter to transmit second frequency pulses having a second frequency different than the first frequencies to the conductor, and a processor having a routine. The routine inputs the sensed value of current from the current sensor, determines if the sensed value of current exceeds a predetermined value and responsively causes the transmitter to transmit the second frequency pulses having the second frequency to the conductor, monitors within a predetermined time after determining that the sensed value of current exceeds the predetermined value if a number of the first frequency pulses having the number of first frequencies is received by the circuit, and responsively delays outputting a trip signal, and, otherwise, immediately outputs the trip signal.
    • 跳闸单元包括用于感测流过导体的电流值的电流传感器,用于从导体接收具有多个第一频率的第一频率脉冲的电路,发射器发射具有与第一频率不同的第二频率的第二频率脉冲 导体的频率,以及具有例程的处理器。 该程序从当前传感器输入电流的感测值,确定电流的感测值是否超过预定值,并且响应地使发射机将具有第二频率的第二频率脉冲发送到导体,在确定之后的预定时间内监视 如果电路接收到具有第一频率数的第一频率脉冲的数量,则电流的感测值超过预定值,并且响应地延迟输出跳闸信号,否则立即输出跳闸信号。