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提出了利用与被检电信号稳态值同步的恒幅全波整流电压作为变值整定的故障电信号快速检测方法。通过对由比较器、带通滤波器及精密整流电路构成的模拟实验电路测试。表明该方法可大大缩短故障电信号的取样时间，对减少（消除）井下电故障危害有积极意义。
A fast detection method of fault signal based on the constant amplitude full-wave rectified voltage synchronized with the steady state value of the detected signal is proposed. Through the comparator, band-pass filter and precision rectifier circuit composed of analog experimental circuit test. It shows that this method can greatly shorten the sampling time of fault electrical signal and has positive significance for reducing (eliminating) the harm of underground electrical fault.