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1.铁路行车设备对电源可靠性要求极高。 铁路的一级负荷约占全部负荷的三分之一,大多数一级负荷都具有两路独立电源供电。目前,自动闭塞10千伏高压线路全部实现了两路电源及相邻配电所的自动互投。在区间的每一架信号机也都由两台信号变压器供给低压电源。但是,由于电力系统或自闭高低压线路的故障,仍有可能使信号机消灯。为了保证自动闭塞安全可靠的供电,近几年几乎所有主要铁路干线都在自动闭塞高压线路附近并行架设了另一条高压线路(即
1. Railway traffic equipment on the power supply reliability requirements. The primary load of the railway accounts for about one third of the total load, and most of the primary loads have two independent power supplies. At present, automatic blocking of 10 kV high-voltage lines all realized automatic switching of two power sources and adjacent power distribution. In the interval of each signal are also provided by the two signal transformer low-voltage power supply. However, it is still possible to disable the signal light due to a fault in the power system or autobamp circuits. In order to ensure automatic and safe blocking of the power supply, in recent years almost all major rail lines have installed another high-voltage line parallel to the automatically blocked high-voltage line