To provide a ground fault protection device that can perform the minimum necessary opening of a breaker by identifying a place where a ground fault accident occurred.SOLUTION: An direct-current ground fault relay 10 includes: a detection unit 10a that detects a ground fault voltage in a feeder system S supplying a direct current to a train E; and a determination unit 10c that determines whether or not a ground fault that occurred is an alternating-current ground fault depending on whether or not the ground fault voltage detected by the detection unit 10a includes a second harmonic.SELECTED DRAWING: Figure 1
【課題】地絡事故が発生した場所を特定することにより、必要最小限の遮断器の開放を可能とする地絡保護装置を提供する。【解決手段】直流地絡継電器10が、電車Eに直流を給電するき電システムSにおける地絡電圧を検出する検出部10aと、検出部10aが検出した地絡電圧に第2調波が含まれるか否かにより、発生した地絡が交流地絡か否かを判定する判定部10cを有する。【選択図】図1
GROUND FAULT PROTECTION DEVICE
地絡保護装置
2019-06-27
Patent
Electronic Resource
Japanese
GROUND FAULT PROTECTION DEVICE AND GROUND FAULT PROTECTION SYSTEM
European Patent Office | 2017
|GROUND FAULT PROTECTION SYSTEM AND GROUND FAULT PROTECTION DEVICE IN SUBSTATION FOR RAILROAD TRACK
European Patent Office | 2018
|Ground Fault Protection on 400-Cycle Ground Power Unit
SAE Technical Papers | 1973
Safety and Ground Fault Protection in Electrical Systems
Online Contents | 1998
|