PROBLEM TO BE SOLVED: To provide a method for detecting a ground fault in an ac-side connection wire of a rectifier for DC feeding capable of reducing impacts on train operation in response to occurrence of a ground fault in an electric cable way (AC side) between a transformer for a rectifier in a substation for DC electric trains, by providing a method to detect the fault as well as to separate a position where the fault exists from a secondary side (DC side) of the rectifier, and by quickly searching and removing the fault point, to restore power generation at the substation.SOLUTION: A method for detecting a ground fault in an AC-side connection wire of a rectifier for DC feeding comprises: measuring a current flowing in a ground wire 10 with which a shield layer 9s of a connection wire 9 between a transformer 7 for a rectifier and a rectifier 8 at a substation 2 for DC electric trains; extracting a third harmonic component from harmonic components for a commercial frequency of the current; and detecting a ground fault in the connection wire 9 between the transformer 7 for the rectifier and the rectifier 8 at the substation 2 on the basis of a change in magnitude of the third harmonic component.SELECTED DRAWING: Figure 3
【課題】直流電鉄用変電所の整流器用変圧器と整流器の間の電路(交流側)で地絡故障が起こった場合に、この故障を検知するとともに故障点の存在位置を整流器の2次側(直流側)と切り分ける方法を提供し、故障点の探索と除去を早急に行なって、変電所の復電を速やかに実施させ、列車の運行への影響を低減することができる直流き電用整流器の交流側接続線の地絡故障検出方法を提供する。【解決手段】直流電鉄用変電所2の整流器用変圧器7と整流器8の間の接続線9の遮蔽層9sが接続された接地線10に流れる電流を測定し、この電流の商用周波数に対する高調波成分の内、第3次高調波成分を抽出し、この第3次高調波成分の大きさの変化によって、変電所2の整流器用変圧器7と整流器8との間の接続線9における地絡故障を検出する。【選択図】図3
METHOD FOR DETECTING GROUND FAULT IN AC-SIDE CONNECTION WIRE OF RECTIFIER FOR DC FEEDING
直流き電用整流器の交流側接続線の地絡故障検出方法
2017-09-14
Patent
Elektronische Ressource
Japanisch
IPC: | B60M Speiseleitungen oder Vorrichtungen am Gleis für elektrisch angetriebene Fahrzeuge , POWER SUPPLY LINES, OR DEVICES ALONG RAILS, FOR ELECTRICALLY-PROPELLED VEHICLES / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen |
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