一起500 kV斷路器防跳回路異常分析及改進

 

顧用地，張東明，許格，劉杰，彭晨光

（國網(wǎng)浙江省電力有限公司檢修分公司，浙江 杭州 311232）

 

    摘 要：某500 kV線路斷路器出現(xiàn)多次合閘- 分閘的“跳躍”現(xiàn)象，防跳功能失敗。分析了防跳失敗的原因為斷路器的分閘時間比防跳繼電器勵磁動作時間要快，在防跳回路未形成自保持的情況下，斷路器完成了分閘，致使防跳失敗。提出兩種改進方法，一種是把防跳繼電器更換為快速繼電器，并采用提前閉合、延后打開型的斷路器輔助接點作為啟動防跳繼電器勵磁的斷路器位置接點；另一種是在斷路器合閘控制回路中增加一條短接線，利用合閘彈簧儲能接點來實現(xiàn)防跳繼電器勵磁后的自保持，從而避免防跳失敗。

    關(guān)鍵詞：500 kV 斷路器；防跳功能；快速繼電器；儲能接點

    中圖分類號：TM561     文獻標(biāo)識碼：B     文章編號：1007-3175(2018)04-0032-03

    Abstract: That certain 500 kV line circuit breaker appeared several closing-opening "jump" phenomenon causes the unsuccessful anti-jump. This paper analyzed that the reason of unsuccessful anti-jump was that the opening time of circuit breakers was shorter than the excitation action time of anti-jump relays. When the anti-jump circuit didn’t form self-holding, the circuit breaker had been opened, resulting in an anti-jump failure. Two improved methods of circuit breaker anti-jump circuits were put forward, one was to make the current anti-jump relay replaced by a fast relay, with the early closure-delayed opening of the circuit breaker auxiliary contact to start the anti-jump relay, the other was to add a short wiring in the circuit breaker closing control circuit, with the closing spring energy contacts to realize the anti-jump relay excitation self-sustaining, so as to avoid antijump failure.

    Key words: 500 kV circuit breaker; anti-jump function; fast relay; spring energy contact