Control method and system of controllable arrester

Abstract

The invention provides a control method of a controllable arrester. The controllable arrester is composed of a controllable part and a fixed part, wherein the controllable part and the fixed part areconnected in series. The controllable part is switched through a control switch connected with both ends thereof. When the control switch is closed, the controllable part drops out. When the control switch is opened, the controllable part is in. The control method comprises the steps that line electrification detection is carried out; the controllable part is controlled to be connected in parallelwith opening and closing of the control switch according to the detection result, so that in and out of the controllable part automatically cooperate with opening and closing of a line switch; at thesame time, the running state of the control switch connected in parallel with the controllable part is monitored in real time; and when the control switch is abnormal, the line switch is operated inlinkage. The invention further proposes a control system of the controllable arrester. According to the invention, the control system of the controllable part of the controllable arrester and the control system of the line switch can be decoupled; the logic reliability of the controllable part in closing of the lock line switch is improved; and the intervention of operating personnel is reduced.

Description

technical field [0001] The invention belongs to the field of high voltage and extra high voltage power transmission, and in particular relates to a control method and system of a controllable lightning arrester. Background technique [0002] The controllable surge arrester is an operating overvoltage flexible limiting device that adapts to changes in operating conditions. The arrester body is composed of a controllable part and a fixed part in series. Both ends of the controllable part are connected to control switches in parallel. The control switch can be a power electronic switch , The bypass circuit breaker is realized, the control switch is closed and the controllable part is withdrawn, and the control switch is opened and the controllable part is put into operation. This method is combined with the method of installing a conventional lightning arrester in the middle of the line, which can deeply reduce the operating overvoltage and cancel the closing resistance of the ...

AI Technical Summary

Problems solved by technology

[0007] 1) There are many connections between the control system and the control and protection system of the original line switchgear in the station, which will reduce the reliability of line operating condition switching in the field of power system

[0008] 2) The delay between the operation of cutting off the controllable part and the closing operation of the line switch has not been optimally designed

[0009] 3) When the operation of removing the controllable part fails abnormally, the control strategy for closing the circuit breaker is not designed

[0010] 4) The control of the controllable part requires the intervention of the operator, which reduces the reliability of the operation

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