脉冲电容器残余电荷对MOV残压影响的试验研究  

Experimental Research on the Effect of the Impulse Capacitance Residual Charge on MOV Residual Voltage

作　　者：赵佳欢[1] 王培[1] 牛萍[1] 汪计昌 冯晶晶 

机构地区：[1]嘉兴市气象局,浙江嘉兴314000 [2]扬州雷凯信息技术有限公司,江苏扬州225127 [3]桐乡市气象局,浙江桐乡314500

出　　处：《电瓷避雷器》2012年第6期52-55,61,共5页Insulators and Surge Arresters

摘　　要：基于GB18802.1-2011,对MOV进行8/20μs冲击电流试验时,经常发现当冲击电流归零后,残压或者持续一段时间归零(正峰)、或者过零(反峰)后再归零。为解释这一普遍存在的试验现象,对冲击试验回路在带负载情况下进行了等效电路分析,并利用试验得出:由于冲击后主回路开关不能迅速切断回路,使电容器上残余电荷形成的电压加在试品上导致电流过零后还存在残压,其值等于电容器残余电荷形成的电压,持续时间为开关关断所用时间。Based on GB18802.1-2011,when 8/20μs impulse current is applied on MOV,it is always found that when impulse current became zero,the residual voltage may either hold for a moment then become zero（positive peak） or become zero after zero passage（negative peak）.To explain the widespread test phenomenon,an equivalent circuit analysis are carried out on the impulse test circuit and the test results obtained that： since the switch couldn＇t switch off the circuit quickly enough,the residual voltage formed by residual charge of the capacitance is applied on the test sample,which cause that the residual voltage still exist after current zero passage,the value is equal to the voltage formed by the residual charge of the capacitance,the duration is the time of switched off.

关 键 词：8 20μs冲击电流 MOV残压 开关关断时间 电容器剩余电荷 

分 类 号：TM862[电气工程—高电压与绝缘技术]