Controllable lightning arrester based on trigger type overvoltage control switch with antifouling structure

Abstract

A controllable lightning arrester with a surface-triggered overvoltage control switch with an antifouling structure is formed by combining the surface-triggered overvoltage control switch and a zinc oxide lightning arrester. The zinc oxide lightning arrester is divided into a fixed lightning arrester and the controllable lightning arrester, and the surface trigger gas overvoltage control switch is connected in parallel with the controllable part of the lightning arrester. When lightning overvoltage or operation overvoltage occurring in a power transmission and distribution network exceeds a certain threshold value, the surface trigger type gas overvoltage control switch with the antifouling structure automatically acts, so that the controllable part of the lightning arrester is short-circuited, and the purpose of limiting the overvoltage amplitude at the two ends of the whole lightning arrester is achieved. When lightning overvoltage and operation overvoltage occur, the surface trigger type overvoltage control switch with the antifouling structure automatically acts, and the controllable part of the lightning arrester is short-circuited, so that the operation overvoltage or the impact residual voltage is obviously reduced to the impact residual voltage value of the fixed part.

Description

technical field [0001] The invention relates to a controllable surge arrester in the fields of electric power, high-speed information railway power transmission, etc., in particular to a controllable surge arrester based on a trigger-type overvoltage control switch with an anti-fouling structure. Background technique [0002] Overvoltage protection is an important guarantee for the safe operation of power systems. With the increase of the voltage level of the power transmission and distribution network, the overvoltage level will directly affect the selection, manufacturing technology and engineering cost of power equipment. Among them, the operating overvoltage is the decisive factor for the insulation level of the power system. At the same time, since the protection level of lightning overvoltage is also the main performance evaluation index of arresters, it also plays a decisive role in the insulation level of power equipment. Due to the restriction of the technical perf...

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Problems solved by technology

However, there are serious defects in the following two aspects: ①Due to the limitation of the thyristor voltage, many thyristors need to be connected in series under high voltage conditions, and the technical problem of synchronous triggering needs to be solved; ②Because the thyristor is affected by its voltage change rate dU / dt and current change The limitation of the rate dI / dt requires additional voltage and current limiting measures to protect it, which increases the complexity of overvoltage protection and also has a relatively large impact on the voltage distribution of the arrester

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