The invention relates to a direct current traction system current type frame protection method and device, and belongs to the technical field of subway direct current traction systems. In a subway direct-current traction power supply system, when a short-circuit fault occurs between a direct-current equipment anode and a direct-current equipment frame or insulation between the direct-current equipment frame and the ground is reduced, the fault can be reflected and removed through current type frame protection. Wherein the directional current detection element is connected between a direct current equipment frame and an earth screen, and when it is stipulated that a measurement signal output by the leakage current measurement element is positive, a short-circuit fault occurs; when the measurement signal output by the leakage current measurement element is negative, insulation decline occurs. Moreover, the actual value of the leakage current is calculated through the collected output signal of the directional leakage current measuring element, thereby achieving the ground insulation monitoring and early warning of the DC equipment frame, and improving the operation safety of a subway line.
本发明涉及一种直流牵引系统电流型框架保护方法及装置,属于地铁直流牵引系统技术领域。在地铁直流牵引供电系统中,当直流设备正极与直流设备框架之间发生短路故障或直流设备框架与地之间发生绝缘下降时,可通过电流型框架保护反映和切除故障。其中方向型电流检测元件接于直流设备框架与地网之间,规定泄露电流测量元件输出测量信号为正时,发生短路故障;泄露电流测量元件输出测量信号为负时,发生绝缘下降。且利用采集的方向型泄露电流测量元件输出信号计算得到泄露电流实际值实现直流设备框架对地绝缘监测预警,提高地铁线路运营安全。
Current type frame protection method and device for direct current traction system
一种直流牵引系统电流型框架保护方法及装置
2023-11-10
Patent
Electronic Resource
Chinese
IPC: | H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / 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 |
Alternating current-direct current electric locomotive traction device and system
European Patent Office | 2015
|Protection of direct-current traction networks against short circuits
Engineering Index Backfile | 1929
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