地铁车辆主熔断器选型分析

Analysis on main fuse selection for metro vehicle

地铁车辆运营服务是通过主电路从接触网上获得能量,因此主电路的安全对列车运营显得尤为重要。当主电路发生过载或短路故障时,保护装置可以快速地清除故障,使故障区域不会扩大。主熔断器在地铁车辆上通常用作过载及短路保护,具有响应时间快、分断容量大等特点。文章结合南京地铁3号线项目设计,简要分析了主熔断器的选型要素,提出主电路安全保护装置的配置应从保护能力、经济性、故障概率等多方面综合考虑。

The main circuit gets power from catenary to feed metro vehicle for service, so the safety of main circuit is very important for trains. When the main circuit gets overload or short circuit, the fault should be cleared quickly by the protection device, preventing the fault from getting worse. The main fuse is used for short circuit protection normally in metro vehicle, since it has short response time, high breaking capacity and so on. Combining with Nanjing Metro Line 3 project, this paper briefly discusses how to select main fuse, presents that circuit protection device configuration should consider the protection ability, economics and fault probability.