Controllable lightning arrester of trigger type overvoltage control switch with field distortion structure

Abstract

A controllable lightning arrester of a trigger type overvoltage control switch with a field distortion structure comprises a zinc oxide lightning arrester and the trigger type overvoltage control switch with the field distortion structure, the zinc oxide lightning arrester comprises a fixed lightning arrester and a controllable lightning arrester which are connected in series, and the controllable lightning arrester is connected in parallel with a trigger type overvoltage control switch with a field distortion structure; and the upper electrode of the fixed lightning arrester is connected with the upper end of protected electrical equipment, and the lower electrode of the controllable lightning arrester is connected with the lower end of the protected electrical equipment. When lightning overvoltage or operation overvoltage in a power transmission and distribution network exceeds a certain threshold value, the field distortion trigger type overvoltage control switch is automatically switched on, so that a controllable part in 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.

Description

technical field [0001] The invention relates to a trigger-type controllable surge arrester for an overvoltage control switch in the fields of electric power, high-speed information railway power transmission, etc., in particular to a trigger-type controllable surge arrester for a trigger-type overvoltage control switch with a field distortion 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 powe...

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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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