A controllable surge arrester with trigger type overvoltage control switch with field distortion structure

Abstract

A controllable surge arrester with a trigger type overvoltage control switch with a field distortion structure, comprising a zinc oxide surge arrester and a trigger type overvoltage control switch with a field distortion structure, the zinc oxide surge arrester includes a fixed surge arrester connected in series and a controllable Lightning arrester, the controllable lightning arrester is connected in parallel with the trigger type overvoltage control switch with field distortion structure; the upper electrode of the fixed lightning arrester is connected with the upper end of the electric equipment to be protected, and the lower electrode of the controllable lightning arrester is connected with the electric equipment to be protected connected at the bottom. When the lightning overvoltage or operating overvoltage in the transmission and distribution network exceeds a certain threshold, the field distortion triggered overvoltage control switch is automatically turned on, thereby short-circuiting the controllable part of the arrester to limit the overvoltage at both ends of the arrester Amplitude purpose.

Description

technical field [0001] The invention relates to a trigger-type controllable arrester for overvoltage control switches in the fields of electric power, high-speed information railway power transmission and the like, in particular to a trigger-type overvoltage control switch controllable arrester with field distortion structure. Background technique [0002] Overvoltage protection is an important guarantee for the safe operation of power systems. With the improvement of the voltage level of the transmission and distribution grid, the overvoltage level will directly affect the selection of power equipment, manufacturing technology and engineering costs. 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 the arrester, it also plays a decisive role in the insulation level of the power equipment. Due to the ...

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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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