10kv multi-stage series gap lightning stroke flashover protector with arc striking electrode

Abstract

The invention discloses a 10kV multi-stage series gap lightning stroke flashover protector with an arc striking electrode. The multi-stage series gap lightning stroke flashover protector comprises the arc electrode striking, a zinc oxide lightning arrester, a support cross arm and a support adjusting plate, wherein the arc striking electrode is fixed at the high-voltage end of the zinc oxide lightning arrester; a first-stage discharging gap is formed between a high-voltage conducting wire and the zinc oxide lightning arrester; the high-voltage end of the zinc oxide lightning arrester is connected with the arc striking electrode, and the low-voltage end of the zinc oxide lightning arrester is fixed at one end of the support adjusting plate; the zinc oxide lightning arrester is provided with a second-stage discharging gap; one end of the support cross arm is fixed on an insulator steel leg, and the other end of the support cross arm is connected with one end of the support adjusting plate; and one end of the support adjusting plate is fixed at the low-voltage end of the zinc oxide lightning arrester, and the other end of the support adjusting plate is connected with the support cross arm. The unique multi-stage series pure air gap structure can ensure the effective action of the lightning stroke flashover protector, has high arc extinguishing capability, has the discharging residual voltage far lower than the flashover voltage of the insulator, does not withstand system voltage, and can prolong the service life of the lightning stroke flashover protector.

Description

technical field [0001] The invention relates to lightning protection equipment, in particular to a 10kV lightning strike flashover protector with multi-level serial gaps of arc-starting electrodes. 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 blown on the lightning flashover channel wire. Overhead power distribution lines use insulated wires, which solve the corridor and safety problems that bare wires cannot solve. Compared with cables, they have obvious advantages of less investment and faster construction. However, the problem of lightning disconnection is more prominent, and there have been many lightning disconnection accidents of insulated conductors across the country. According to the field operation conditions, 10k...

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Problems solved by technology

[0003] Composite insulating cross-arms, piercing arc-proof fittings, lightning protection pillar insulators and zinc oxide arresters are currently used, but according to the feedback from field practice, there are various problems, and it is difficult to form effective measures

For example, the production and installation costs of composite insulating cross-arms are high, and the on-site installation is complicated; piercing arc-proof fittings will affect the reliability of power supply and power quality, and the tripping rate of lightning strikes is relatively high. After puncturing the insulation layer, water may enter the core of the insulated wire , lead to electrochemical corrosion and disconnection at the sag of the wire; the mechanical strength of the insulator of the lightning protection post insulator is low, much lower than that of the pin insulator, and the stress concentration is high; the protection range of the zinc oxide arrester is small, and the installation of the entire line may cause The insulated wire core has water ingress, which leads to electrochemical corrosion and disconnection at the sag. Long-term exposure to power frequency voltage may cause aging of the zinc oxide valve plate, which must be operated and maintained.

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