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    • 7. 发明授权
    • Method for detecting short-circuit conditions and device which uses this method
    • 检测短路条件的方法及使用该方法的装置
    • US06437576B2
    • 2002-08-20
    • US09092657
    • 1998-06-05
    • Fabrizio Lorito
    • Fabrizio Lorito
    • G01R3102
    • H02H3/44G01R31/025
    • Method and device for the rapid detection of short-circuits in an electrical network. The method is based on estimating the electrical characteristics of the short-circuit load and calculating the peak value of the current on the basis of N successive samplings of the instantaneous current (i(t)). If the calculated value, typically available before the current actually attains this value, is greater than a pre-established threshold (Icc), a signal (C) is emitted indicative of a short-circuit fault. The calculation of the peak value may occur automatically for example upon switching on, or be subject to the exceeding of a guard threshold (Is) by the instantaneous current (i(t)). Moreover, the method makes it possible concurrently to determine the value of the power factor of the short-circuit (cos &phgr;) and the phase of the voltage at the moment of the short-circuit.
    • 用于快速检测电网短路的方法和装置。 该方法基于估计短路负载的电特性并基于瞬时电流(i(t))的N个连续采样来计算电流的峰值。 如果当前实际达到该值之前通常可用的计算值大于预先设定的阈值(Icc),则发出指示短路故障的信号(C)。 峰值的计算可以例如在接通时自动发生,或者通过瞬时电流(i(t))超过保护阈值(Is)。 此外,该方法可以同时确定短路功率因数的值(cos phi)和电压在短路时的相位。