Surface trigger type controllable lightning arrester composed of surface trigger type overvoltage control switch and zinc oxide lightning arrester

Abstract

A surface trigger type controllable lightning arrester composed of a surface trigger type overvoltage control switch and a zinc oxide lightning arrester comprises the zinc oxide lightning arrester, and the zinc oxide lightning arrester comprises a fixed lightning arrester and a controllable lightning arrester which are connected in series. The upper electrode of the fixed lightning arrester is connected with the upper end of protected power equipment which is connected with the zinc oxide lightning arrester in parallel, and the lower electrode of the controllable lightning arrester is connected with the lower end of protected lightning protection equipment; the controllable lightning arrester is connected in parallel with the surface trigger type overvoltage control switch; and an automatic energy coupling trigger circuit is connected between the controllable lightning arrester and the surface trigger type overvoltage control switch. The surface trigger type overvoltage control switch connected with the controllable lightning arrester in parallel has the remarkable advantages of being high in alternating current and direct current withstand voltage, low in impact breakdown voltage, high in overvoltage response speed, capable of being well matched with the whole lightning arrester and the like, the volt-ampere characteristic of the whole lightning arrester can be remarkably improved, the voltage-to-current characteristic of the whole lightning arrester can be remarkably improved, and the levels of lightning and operating overvoltage are limited.

Description

technical field [0001] The invention belongs to the technical field of arresters, and relates to a trigger-type controllable arrester, in particular to a surface-trigger type controllable arrester composed of a surface-trigger overvoltage control switch and a zinc oxide arrester. [0002] technical background [0003] 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 performance o...

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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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