To provide a ground fault detector capable of accurately detecting the occurrence of ground fault by just performing sequential operations on the time axis, without installing additional equipment on the train tracks nor performing FFT (fast Fourier transform).SOLUTION: A ground fault detector 20 includes: a current detector 21 that generates a signal SG1 by detecting the current flowing through the feeder cable; a filter processing unit 22 that generates a signal SG2 by performing bandpass filter processing and comb-shaped filter processing on the signal SG1; a comparison counting unit 23, which counts the number of times TM1 the signal SG2 has changed from a state in which there is a magnitude relationship with the threshold value to another state; and a determination unit 24 that determines that a ground fault has occurred in the DC feeder circuit when the number of times TM1 exceeds the threshold number.SELECTED DRAWING: Figure 2

    【課題】電車線路に追加設備を新設することなく、且つ、FFT演算を行うことなく、時間軸上で逐次演算を行うだけで、地絡の発生を精度良く検出することができる地絡検出装置を提供する。【解決手段】地絡検出装置20は、き電ケーブルに流れる電流を検出して信号SG1を生成する電流検出部21と、信号SG1に対してバンドパスフィルタ処理と櫛形フィルタ処理とを施すことにより信号SG2を生成するフィルタ処理部22と、信号SG2と閾値との大小関係がある状態から他の状態に変化した回数TM1を計数する比較計数部23と、回数TM1が閾値回数を超えたとき、直流き電回路に地絡が発生したと判定する判定部24と、を有する。【選択図】図2


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    Title :

    GROUND FAULT DETECTOR AND GROUND FAULT DETECTION METHOD


    Additional title:

    地絡検出装置及び地絡検出方法


    Contributors:

    Publication date :

    2021-09-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60M Speiseleitungen oder Vorrichtungen am Gleis für elektrisch angetriebene Fahrzeuge , POWER SUPPLY LINES, OR DEVICES ALONG RAILS, FOR ELECTRICALLY-PROPELLED VEHICLES / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen



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