直流分量時間常數(shù)對斷路器非對稱開斷性能影響分析
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、燃弧時差、電弧能量等方面分析了直流分量時間常數(shù)對斷路器非對稱電流開斷性能的影響，給出了非對稱短路計(jì)算模型及計(jì)算方法。結(jié)果表明直流分量時間常數(shù)越大，短路電流中直流分量越大且衰減越慢，燃弧時差越大，電弧能量越大，電流過零時di /dt 降低，TRV 參數(shù)亦有所降低，且非對稱電流開斷時，直流分量時間常數(shù)增大將導(dǎo)致斷路器的開斷條件變得苛刻。
關(guān)鍵詞：直流分量時間常數(shù)；非對稱開斷；短路電流有效值；燃弧時差
中圖分類號：TM561 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-3175(2016)08-0047-04
Analysis of Direct Current Component Time Constant Influence on
Asymmetrical Breaking Ability of Circuit Breakers
LIU Xiao-hao, LIU Xu, LI Jian, SU Qi-li, LIU Chao-feng, WANG Lei
（Henan Pinggao Electric Co., Ltd., Pingdingshan 467001, China）
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
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