直流分量時(shí)間常數(shù)對(duì)斷路器非對(duì)稱開(kāi)斷性能影響分析

 

劉小浩，劉旭，李健，蘇其莉，劉超峰，王磊

（河南平高電氣股份有限公司，河南 平頂山 467001）

 

    摘 要：從短路電流的有效值、燃弧時(shí)差、電弧能量等方面分析了直流分量時(shí)間常數(shù)對(duì)斷路器非對(duì)稱電流開(kāi)斷性能的影響，給出了非對(duì)稱短路計(jì)算模型及計(jì)算方法。結(jié)果表明直流分量時(shí)間常數(shù)越大，短路電流中直流分量越大且衰減越慢，燃弧時(shí)差越大，電弧能量越大，電流過(guò)零時(shí)di /dt 降低，TRV 參數(shù)亦有所降低，且非對(duì)稱電流開(kāi)斷時(shí)，直流分量時(shí)間常數(shù)增大將導(dǎo)致斷路器的開(kāi)斷條件變得苛刻。

    關(guān)鍵詞：直流分量時(shí)間常數(shù)；非對(duì)稱開(kāi)斷；短路電流有效值；燃弧時(shí)差

    中圖分類號(hào)：TM561     文獻(xiàn)標(biāo)識(shí)碼：A     文章編號(hào)：1007-3175(2016)08-0047-04

    Abstract: This paper analyzed the direct current (DC) component time constant influence on asymmetrical current breaking ability of circuit breakers from the aspects of effective value of short-circuit current, difference of arcing time, arc energy and so on, and gave the calculation model and method of asymmetrical short-circuit. The results show that the bigger the DC component time constant is, the bigger the DC component in short-circuit current is, the slower the attenuation is, the bigger the difference of arcing time is , the bigger the arc energy is. When the current is zero, the parameters of di/dt and TRV are decreased. When the asymmetrical current cuts off, the increase of the DC component time constant will make the breaking conditions of circuit breakers more rigorous.

    Key words: direct current component time constant; asymmetrical breaking; effective value of short-circuit current; difference of arcing time