Plate gap surge arrester based on superposition of short-arc drop and near-cathode effect

Abstract

The invention relates to a flat plate gap arrester based on superposition of short-arc drop and near-cathode effect, including an insulating mandrel, several flat plate discharge electrodes axially threaded on the insulating mandrel, a fixing seat installed at the low-voltage end of the insulating mandrel, an insert The low-voltage electrode in the fixing seat and the main gap discharge electrode arranged at the high-voltage end of the insulating mandrel, and the silicone rubber vulcanization process used to fix the insulating mandrel, a plurality of the flat discharge electrodes, the fixing seat and The silicone rubber outer sheath of the main gap discharge electrode, wherein, several of the flat plate discharge electrodes are arranged uniformly and in parallel. Zinc oxide-free resistors, green and environmentally friendly, overcome the failure of zinc oxide resistors and the defects of moisture; the arc extinguishing mechanism is composed of three parts: near-cathode effect superposition, near-pole voltage drop superposition, and chamber blowing arc, which can effectively reduce overhead lines due to The arc establishment rate caused by lightning strikes can effectively reduce the line lightning tripping rate under extreme working conditions such as heavy minefields and harsh wet environments.

Description

technical field [0001] The invention relates to the technical field of lightning protection for high-voltage transmission lines in electric power systems, in particular to a flat-plate gap arrester based on superposition of short-arc drop and near-cathode effect. Background technique [0002] With the continuous in-depth research of power system line arresters, the application of various new arresters is developing rapidly. The multi-gap arrester is designed for lightning protection by utilizing the characteristics of multi-section arcs generated by gas gap discharge in high-voltage technology. In the actual application process, the discharge electrode will be loosened between the external surface of the discharge electrode and the external structure due to thermal expansion and contraction due to the thermal effect of the arc burning; under the action of lightning impulse current, the discharge electrode will be Displacement or even falling off is caused by the explosive f...

AI Technical Summary

Problems solved by technology

Under the dual effects of thermal effect and electromagnetic power, the fixed position of the discharge electrode is prone to change and damage the multi-gap structure, which makes the lightning protection characteristics of the multi-gap arrester change, which seriously leads to the failure of its lightning protection function and causes accidents.

[0003] However, the traditional metal oxide arrester has a large structure, is not easy to install, is difficult to process, and the production cost is expensive. There are restrictive factors such as flow capacity, voltage gradient, heat accumulation effect and complex process.

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