To provide an erroneous detection prevention type DC voltage ground relay having a high reliability so as to prevent train operations from being affected without malfunction due to ground faults on a secondary side line of high-voltage distribution transformers installed in DC substations for electric railways, and so on.SOLUTION: A DC high voltage ground relay includes: a potential difference measurement unit 5 that is provided between a ground mat 3 and a return line 4 of a DC substation 2 for an electric railway and measures the potential difference; a DC ground fault determination output unit 6 that determines a DC ground fault using the potential difference and outputs a DC ground fault signal Fd; and a malfunction prevention unit 13 that prevents the DC ground fault determination output unit 6 from outputting the determination of the DC ground fault signal Fd when the potential difference occurred between the ground mat 3 and the return line 4 is due to a ground fault in an AC electric circuit 2A.SELECTED DRAWING: Figure 1
【課題】電気鉄道用直流変電所に設置されている高圧配電用変圧器の2次側線路の地絡故障等により誤動作することなく、電車の運行に影響を与えないような、高い信頼性を有する誤検知防止型直流高圧接地継電器を提供する。【解決手段】電気鉄道用直流変電所2の接地マット3と帰線4の間に設けられてこの電位差を測定する電位差測定部5と、この電位差を用いて直流地絡を判定して直流地絡信号Fdを出力する直流地絡判定出力部6と、接地マット3と帰線4の間に生じる電位差が交流電路2Aの地絡故障によるものであるときに、直流地絡判定出力部6による直流地絡信号Fdの判定出力を阻止する誤動作防止部13とを備える。【選択図】図1
DC HIGH VOLTAGE GROUND RELAY
直流高圧接地継電器
2023-03-13
Patent
Elektronische Ressource
Japanisch
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