Two-stage series gap lightning flashover protector capable of being replaced in electrified mode

Abstract

The invention discloses a two-stage series gap lightning flashover protector capable of being replaced in an electrified mode. A high-voltage wire is connected to a wire clamp seat in a led mode, the lightning flashover protector cannot be affected by power frequency voltage or switching overvoltage at ordinary times through the air gap between a drainage rod and a discharge electrode, and therefore the service life of the lightning flashover protector is prolonged. When lightning overvoltage exists and can break through two series gaps at the same time, the effective action of the lightning flashover protector is guaranteed, the discharge path of arcs is controlled, the amplitude of the lightning overvoltage is limited, and an insulator flashover accident is avoided. Due to the fact that the whole lightning flashover protector is structurally divided into a high-voltage part and an operable part, and the high-voltage part and the operable part are isolated through a core rod, it is guaranteed that when a 10kV overhead line is operated normally and an operator detaches the lightning flashover protector, the operator cannot touch the high-voltage wire. The lightning flashover protector can be conveniently taken down and installed under the power grid electrified condition only through a tool line connector rod commonly used in an electric system.

Description

technical field [0001] The invention relates to a lightning protection device for 10kV overhead lines, in particular to a two-stage serial gap lightning strike flashover protector which can be replaced with electricity. Background technique [0002] The lightning overvoltage amplitude of 10kV overhead distribution lines is high and the discharge time is short, while the insulation level of 10kV distribution lines is low. Lightning overvoltage can cause flashover of insulators, and form power frequency freewheeling on the lightning flashover channel to make the line Lightning tripping and disconnection accidents occurred. The main cause of the lightning strike fault is that the arc is established on the lightning flashover channel to form a power frequency continuous flow, resulting in a metallic disconnection fault. The temperature of the arc root is very high, which can burn the wire in a short time, even if it is a bare wire. If the current passing through is very large, ...

AI Technical Summary

Problems solved by technology

[0003] At present, the lightning protection of 10kV overhead lines in my country adopts lightning protection devices such as composite insulating crossarms, puncture arc-proof fittings, lightning protection post insulators, zinc oxide arresters and zinc oxide arresters with series air gaps, but due to the installation structure There are deficiencies, and these lightning protection devices have the following problems in the actual operation process: (1) after the lightning protection device is installed and operated, it is impossible to judge whether the lightning protection device is good or bad, but its performance must be good (2) According to the requirements of the power system, zinc oxide arrester products must be replaced after 5 years of operation, and power failure replacement includes the economical cost of the power system. The loss and the resulting enterprise production and residents' lives have also caused great losses

[0004] At present, there are dozens of 10kV lines under the jurisdiction of a county power supply bureau in my country, and hundreds of lines at most. From this point of view, due to the defects in the installation structure, the economic losses caused are quite huge

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