切換電容接觸器合閘涌流的研究

打開文本圖片集

中圖分類號：TM572 文獻(xiàn)標(biāo)志碼：A 文章編號：2095-8188（2025）05-0056-07

DOI： 10.16628/j.cnki.2095-8188.2025.05.008

Abstract：When power capacitors are connected to a circuit，a switching inrush current exceeding 2O0 times theratedcurrent willbe generated.Thecapacitorswitching contactor witha current-limiting resistor isoften used to suppress the switching inrush current.In order to optimize the suppression effect，the switching inrush current waveform when the capacitorbank isput intooperation is studied through therandom inrush current suppression experiments，and the primaryand secondaryswitching inrush currentsaredefined.Three current-limiting resistors with different resistance valuesare replaced onthe same capacitor switching contactor，and theinrush current suppression waveforms are obtained byswitching the capacitorbanks with the same capacity.The studyfinds that if theresistancevalueofthecurrent-limiting resistoristoosmall，theprimary inrush current will exceed the application requirements，if theresistance valueof thecurent-limiting resistor is too large，thesecondary inrush current will exceed the application requirements.However，asuitable resistance value of the current-limiting resistor is selected to make the suppression ofthe primaryand secondary inrush currentsachieve theexpected ffect.This providesa reference forthe inspection and selection of capacitor-switching contactors and the determinationof the resistance value of the current-limiting resistor.

Keywords：capacitor-switching contactor；current-limiting resistance；inrush current suppression; primary and secondary inrush current

0 引言

電力電容器被大量應(yīng)用于電力輸配電系統(tǒng)的無功補(bǔ)償和大容量電動(dòng)機(jī)無功補(bǔ)償?shù)葓龊?，然而電容器組在投入線路時(shí)，由電工理論的換路定律可知，電容器組接通瞬間會(huì)出現(xiàn)極高的合閘涌流，該電流峰值可高達(dá)額定電流有效值的200倍以上。（剩余4803字）