Electric railway damping automatic passing neutral section system

Abstract

The invention discloses an electric railway damping automatic passing neutral section system. The system is characterized in that a high-voltage high-capacity resistor (R) is connected in series between power supply arms (U, D) of a traction substation and a contact network neutral section (M1) at the outlet of the traction substation; a high-voltage high-capacity resistor (R) is also connected in series between the power supply arms (U, D) of the traction substation and a contact network neutral section (M2) between two traction substations; and a split-phase insulated element (G) is connected in series between the contact network neutral section (M1) at the outlet of the traction substation and the contact network neutral section (M2) between the two traction substations. The system can be used for avoiding transient over-voltage phenomenon in a locomotive running process, and realizing safe and reliable automatic passing neutral section of an electric locomotive. The system has the advantages of simple structure, low cost and suitability for long-term operation.

Description

technical field [0001] The invention relates to an automatic phase separation system for an electrified railway. Background technique [0002] The single-phase system has the advantages of simple structure, low construction cost, convenient operation and maintenance, etc., which determines that single-phase power frequency AC power is generally used to power railway locomotives in electrified railways. The power system hopes that all loads will draw three-phase symmetrical currents from the grid, that is, to ensure the symmetry of the three-phase loads. In order to meet this requirement, the electrified railway adopts the scheme of phase sequence rotation and phase-by-phase power supply. Every 20-25km along the railway line is used as a power supply section, and each section is powered by different phases in the power grid in turn. This method of segmented power supply and phase commutation forms a unique structure of the electrified railway traction power supply system - e...

AI Technical Summary

Problems solved by technology

When the train enters the neutral section, a transient high voltage will be generated at the moment when the train is powered off. This high voltage will break down the air and generate electric sparks. If the electric spark continues until it leaves the neutral section, it will cause a short circuit accident in the adjacent power supply arm. , causing damage to the power supply system and the locomotive

In order to avoid this situation, the length of the neutral section can be extended, but the running speed and efficiency of the train are reduced; Complicated, and in the high-speed operation of the train, if the operation is slightly improper, accidents will occur

Although there are also on-vehicle automatic over-phase and ground automatic over-phase devices, these devices require high-voltage switches and automatic control devices, which are costly and unreliable, and frequent switching will still cause transient overvoltage, which affects the traction system and locomotives. security and stability

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