The present invention relates to a protective relay system and method for detecting a ground fault accident in power supply lines of an electric vehicle, wherein detection devices detecting a ground fault are installed at certain intervals in an operation section of an electric vehicle operated by an ungrounded system, and when a high-resistance ground fault occurs from the sensing device, an alarm for the ground fault or excessive leakage current is generated or the circuit breaker is tripped to prevent an accident caused by the ground fault in advance. The present invention provides a protective relay system for detecting a ground fault accident on power supply lines of an electric vehicle, comprising: a ground fault detection device that is installed between a post insulator and a support of a catenary to detect a current from the post insulator, flows the current below a set value intactly, and switches a ground current caused by the high-resistance ground fault over a short circuit capacity of a fuse by an overvoltage relay device; an overvoltage relay device that is installed to be connected to a negative pole of a rectifier of a substation supplying power to the catenary, and when a current is transmitted from the plurality of ground fault detection devices, measures an overvoltage to generate an alarm or a circuit breaker trip signal; and a protective relay line (300), which is a transmission line that transmits the ground fault current switched from the plurality of ground fault detection devices to the overvoltage relay device.

    본 발명은 비접지계통으로 운영되는 전기차량 운행 구간에 지락을 감지하는 감지장치를 일정구간마다 설치하고, 감지장치로부터 고저항 지락이 발생되면 지락사고 혹은 과다누설전류에 대한 알람을 발생시키거나 차단기를 트립하도록 하여 지락에 의한 사고를 미연에 방지할 수 있도록 한 전기차량의 급전선로 지락사고감지를 위한 보호계전 시스템 및 방법에 관한 것이다. 이와 같은 본 발명은 전차선의 지지애자와 지지물 사이에 설치되어 지지애자로부터의 전류를 감지하여 설정값 이하의 전류는 그대로 흘러보내고, 퓨즈의 단락용량 이상의 고저항 지락에 의한 지락전류를 과전압계전장치로 스위칭하는 지락감지장치; 상기 전차선에 전원을 공급하는 변전소의 정류기 부극에 연결 설치되어 상기 복수의 지락감지장치로부터 전류가 전송되면 과전압을 측정하여 알람(Alarm)을 발생시키거나, 차단기 트립 신호를 발생시키는 과전압계전장치; 및 복수의 지락감지장치에서 스위칭되는 지락전류를 상기 과전압계전장치로 전송하는 전송선로인 보호계전기선(300);을 포함하여 구성됨을 특징으로 하는 전기차량의 급전선로 지락사고감지를 위한 보호계전 시스템을 제공한다.


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    Title :

    Protective relay system for detecting ground fault in electric vehicle feed line and control method thereof


    Additional title:

    전기차량의 급전선로 지락사고감지를 위한 보호계전 시스템 및 그의 제어 방법


    Contributors:

    Publication date :

    2022-10-13


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Korean


    Classification :

    IPC:    H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen / 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 / G08B SIGNALLING OR CALLING SYSTEMS , Signalisier- oder Rufsysteme / H01B CABLES , Kabel




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