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    • 5. 发明授权
    • Method and apparatus for detecting and suppressing a parallel arc fault
    • 用于检测和抑制并联电弧故障的方法和装置
    • US06590757B2
    • 2003-07-08
    • US09967116
    • 2001-09-28
    • Birger PahlRonald R. JahnWilliam E. BerkopecSlobodan KrsticJoseph C. ZuercherJerome K. Hastings
    • Birger PahlRonald R. JahnWilliam E. BerkopecSlobodan KrsticJoseph C. ZuercherJerome K. Hastings
    • H02N308
    • H02H3/0935H02H1/0015
    • Electrical equipment (14) is safeguarded from damage due to parallel arc faults by a circuit that provides several levels of protection. A semiconductor switch (18) and a current sensor (24) are placed in series with the electrical equipment (14). When the current to the equipment exceeds a first threshold for a predefined period of time, the semiconductor switch (18) is rendered non-conductive until the circuit is specifically reset. When the current to the equipment exceeds a greater second threshold, a pulsed signal alternately places the semiconductor switch (18) in conductive and non-conductive states so that the average current applied to the equipment (14) is within an acceptable level. The pulses are measured to determine whether a parallel arc fault has occurred. When the measured pulses (74) are within a predetermined range, a parallel arc fault is declared and the semiconductor switch (18) is rendered non-conductive. Should the current exceed an even greater third threshold, the semiconductor switch (18) is immediately rendered non-conductive until the circuit is manually reset.
    • 电气设备(14)通过提供多级保护的电路可以避免由于并联电弧故障造成的损坏。 半导体开关(18)和电流传感器(24)与电气设备(14)串联放置。 当到设备的电流超过预定时间段的第一阈值时,半导体开关(18)变为不导通,直到电路被特别复位。 当到设备的电流超过更大的第二阈值时,脉冲信号交替地将半导体开关(18)置于导电和非导通状态,使得施加到设备(14)的平均电流在可接受的水平内。 测量脉冲以确定是否发生并联电弧故障。 当测量的脉冲(74)在预定范围内时,声明并联电弧故障,并使半导体开关(18)变为不导通。 如果电流超过了更大的第三阈值,则半导体开关(18)立即变为不导通,直到电路被手动复位。