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METHOD FOR DETECTING GROUND FAULT OF POWER LINE USING WAVELET TRANSFORM
METHOD FOR DETECTING GROUND FAULT OF POWER LINE USING WAVELET TRANSFORM
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机译：小波变换的电力线接地故障检测方法
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摘要
PURPOSE: A method for detecting a ground fault of a power distribution line using wavelet transform is provided to detect the ground fault through wavelet transform signal analysis about voltage-current data of a transient state. CONSTITUTION: Wavelet transform is performed with an original signal of a voltage and a current caused by occurrence of a fault (S102). After a ground fault is detected by a signal detected through a fourth step low pass filter (S104), a fundamental wave about a coefficient value of the fourth step low pass filter is extracted (S105). A fault point is estimated by using an extracted previously registered wave (S110). After a high resistance ground fault is detected by a signal detected through a first step high pass filter (S107), the fundamental wave about the coefficient value of the fourth step low pass filter is extracted (S108). After tracing an impedance trace of the fundamental wave (S109), the fault point is estimated. [Reference numerals] (AA) Start; (BB,DD) No; (CC,EE) Yes; (FF) End; (S101) EMTP fault is detected; (S102) Voltage and a current Wavelets are converted; (S103) Low pass filter is detected?; (S104) Ground fault is detected; (S105) Coefficient value, fundamental wave are detected; (S106) High pass filter is detected?; (S107) High resistance ground fault is detected; (S109) Impedance trace; (S110) Fault point is extracted; (S111) Line switching
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