Lightning prevention protective clearance for electric railway traction power supply system

Abstract

The invention discloses a protective clearance for protecting an AC electric railway traction power supply system, which comprises an upright column, wherein a wrist and arm insulator is fixedly arranged on the upright column; the high-voltage side end and the low-voltage side end of the wrist and arm insulator are respectively provided with a hoop assembly; the upper parts of the two hoop assemblies are respectively provided with a stainless steel electrode; the two stainless steel electrodes oppositely form a cavel shape; an air clearance is formed between the two stainless steel electrodes;and the stainless steel electrode at the low-voltage side is directly connected to the upright column by a flexible wire. The top ends of the stainless steel electrodes are provided with stainless steel ball heads, and the ablation resistance is high; the protective clearance has the adjustable distance and can be matched with the wrist and arm insulators with different insulation distances; andthe stainless steel electrode at the low-voltage side is reliably connected with the upright column by a flexible wire, thereby preventing the hidden danger that an electric arc is easy to cause by hoop connection.

Description

technical field [0001] The invention relates to an electrified railway traction power supply system, in particular to a lightning protection gap for the electrified railway traction power supply system, which is especially suitable for use on a 27.5KV electrified railway catenary. Background technique [0002] In recent years, my country's electrified railway has developed very rapidly. The electrification of old lines, the operation of passenger dedicated lines, and the start of the Beijing-Shanghai high-speed railway all put forward higher requirements for the reliability of the traction power supply system. However, the existing lightning protection The device has the following problems: [0003] 1. In the existing lightning protection gap, the electrodes forming the gap are made of ordinary metal materials, and the surface needs to be treated with anti-corrosion, which has low reliability and high maintenance cost; [0004] 2. The low-voltage side of the gap support part...

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Problems solved by technology

[0003] 1. In the existing lightning protection gap, the electrodes forming the gap are made of ordinary metal materials, and the surface needs to be treated with anti-corrosion, which has low reliability and high maintenance cost;

[0004] 2. The low-voltage side of the gap support part is connected to the steel cap of the wrist arm insulator through a hoop. The fit between the hoop and the steel cap, and between the bolt and the connection hole is not tight, which may easily cause arc ablation and cause safety hazards

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