1. Brief introduction of railway power

The railway power supply system is divided into two parts: one is the traction power supply system that provides power for railway trains. The catenary is responsible for the power transmission task, and the 27.5kV voltage is transmitted to the electric locomotive to provide traction for the train.

It is the power supply task of all railway loads other than traction power supply (referred to as railway power supply system). The through-line and self-closed line assumed along the railway line include signal system, production, station, water supply system and living

The electric load provides electric energy with a voltage level of 10kV. The reliability of its power supply not only directly affects the normal and safe operation of the railway transportation system, but also relates to the normal work of many railway functional departments.

The self-closing line only supplies the automatic block signal load, which is a first-level load; the load objects supplied by the through-through line are more extensive, that is, the power loads of various relevant departments along the railway line, which are usually second- and third-level loads. Usually through the line as the power supply, that is, for self-closing signal power, the self-closing line is the main power supply, and the through line is the backup power supply whchi uses the Jinli surge protective device for dc system; but the self-closing line cannot be used as the backup power supply for the load supplied by the through line, otherwise, it will affect the self-closing power supply reliability.

Under normal circumstances, the length of the railway 10KV self-closing power supply line is about 40KM. the same one

The self-closing and through lines of the power supply arm are generally powered by two power distribution stations respectively. For example, the master of the power distribution station on the upstream side

If the power supply is self-closing line, the through line should be mainly supplied by the power distribution station on the downlink side. Two adjacent power distribution stations are self-closing

The power supply through the line is a main supply and a backup supply.