Optimization Method of Insulation Performance of 500kv Porcelain Column Circuit Breaker for AC Filter

Abstract

The invention discloses an insulating property optimization method of a 500kV porcelain pole breaker used for an alternating current filter. The insulating property optimization method comprises the following steps: 1) judging the fault type of the 500kV porcelain pole breaker, wherein the fault type comprises an external insulating fault and an internal insulating fault; and 2) when the fault type is an external insulating fault, optimizing a dry arcing distance, improving the air pressure of an arc extinguish chamber or investing a breaking phase selected function when the fault type is a restrike fault, improving contact materials when the fault type is the electric field distortion of the arc extinguish chamber since the contact splashes metal foreign matters, and optimizing a voltage sharing capacitor and an arc extinguish chamber arrangement structure when the fault type is that the contact of the arc extinguish chamber radially breaks down the inner wall of a porcelain cover. According to different fault types, different optimization methods used for improving the insulating property of the breaker are put forward to guarantee that insulating faults including the internal restrike, the external insulating flashover and the like of the arc extinguish chamber can be avoided under the situation that the breaker frequently switches the alternating current filter and is subjected to high transient recovery voltage.

Description

technical field [0001] The invention relates to a method for optimizing the insulation performance of a 500kV porcelain column circuit breaker used in an AC filter under AC and DC working conditions, which analyzes the influence of the special operating conditions of the AC filter (hereinafter referred to as ACF) on the insulation performance of the circuit breaker, and aims at A method for optimizing the insulation performance of circuit breakers for AC filters is proposed. Background technique [0002] During the breaking process of the 500kV porcelain column circuit breaker used by ACF, due to the change of system parameters and working conditions, the electromagnetic energy conversion between the capacitor and the inductor will be caused, resulting in internal overvoltage. At the same time, after disconnection, the fractures need to withstand the joint action of AC and DC mixed overvoltages, which is an operating condition that ordinary AC system circuit breakers do not ...

AI Technical Summary

Problems solved by technology

Generally speaking, there are not many researches on the insulation characteristics of circuit breakers under the mixed superposition of AC and DC at home and abroad. Therefore, the insulation performance of circuit breakers used for ACF still uses the conventional insulation design, resulting in frequent failures. According to statistics, from 2014 to In 2015, a certain type of circuit breaker had 8 internal re-breakdowns in the arc extinguishing chamber, 1 explosion and 3 external insulation flashovers in the NZ converter station, and another type of circuit breaker had 1 explosion in the QX converter station ACCIDENT

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