EARTH DETECTOR, GROUND FAULT PROTECTION DEVICE, AND METHOD FOR DETECTING GROUND FAULT

• Main Authors: TAGUCHI MASAKAZU, KOIKE MICHIO, HASEGAWA MITSUHIRO, INOUE HAJIME
• Format: Patent
• Language: English; Japanese
• Published: 08.03.2018
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

PROBLEM TO BE SOLVED: To provide a device for rapidly detecting generation of a ground fault when a high-resistance ground fault has generated.SOLUTION: An earth detector 101 of a feeding circuit of a direct-current railway includes: a potential difference detection unit 121 for detecting a potential difference between a rail potential and a ground potential; a current detection unit 111 for detecting a current value of a feeding circuit; an operation unit 133 for calculating an operated value of a potential difference value/current value from a potential difference value detected by the potential difference detection unit 121 and a current value detected by a current detection unit 111; and a comparison unit 134 for comparing the operated value obtained by the operation unit 133 with a predetermined threshold value and sending an abnormal detection signal 135 if the operated value is larger than the threshold value.SELECTED DRAWING: Figure 2 【課題】高抵抗地絡の事故が発生した場合に、地絡事故の発生を迅速に検出する装置を提供する。【解決手段】直流電気鉄道のき電回路の地絡検出装置１０１であって、レール電位と大地電位間の電位差値を検出する電位差検出器１２１と、き電回路の電流値を検出する電流検出器１１１と、電位差検出器１２１で検出された電位差値と、電流検出器１１１で検出された電流値とから電位差値／電流値の演算値を算出する演算器１３３と、演算器１３３の演算値を、所定のしきい値と比較し、演算値がしきい値よりも大きくなった場合に、異常検出信号１３５を送出する比較器１３４とを含む地絡検出装置。【選択図】図２