35kV电容式电压互感器高压熔断器熔断的原因分析.pdf

文档介绍：第卷第期
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年月
·124 · 2009Jun. 20096 High High Voltag Voltagee Apparatus ApparatusJun. 2009
电容式电压互感器高压熔断器熔断的原因分析
35 kV
罗军川
四川省广元电业局四川广元
( , 628000)
摘要针对一起电容式电压互感器高压熔断器频繁熔断现象笔者详细分析了电容式电压互感器的工作原理及
: 35 kV , (CVT)
等值电路通过中压互感器的伏安特性试验得出了在系统发生单相接地故障或故障消除的过渡过程中中压互感器
。 CVT , CVT
铁芯深度饱和激发铁磁谐振从而导致高压熔断器熔断的结论笔者还提出在中压互感器二次剩余绕组并联阻尼器是抑
, 。 CVT
制铁磁谐振行之有效的措施同时在产品设计制造时应着力改善中压互感器的空载励磁特性选择伏安特性优越的中压互感
。, ,
器分析结果为改进产品设计提高制造工艺水平和优化运行维护提供了科学依据
。、。
关键词高压熔断器熔断铁磁谐振饱和分析
: CVT ; ; ; ;
中图分类号文献标志码文章编号
: : A :1001-1609(2009)03-0124 -04
Analysis of High-voltage Fuse Blow for 35 kV Capacitor Voltage Transformer
LUO Jun-chuan
(Guangyuan Electric Power Bureau of Sichuan Province, Guangyuan 628000, China)
Abstract: The operation mechanism and equivalent circuit of a capacitor voltage transformer (CVT) are investigated for
analyzing the frequent blow of a 35 kV CVT high-voltage fuse protector. By volt-ampere characteristic test of a medium voltage
CVT, it is found that the core of medium voltage CVT is saturated deeply to excite ic resonance, which leads to
the high-voltage fuse protector blow, during the transition process of single-phase grounding failure or failure elimination. And
then, an available method for ic resonance inhibition is proposed, in which a damper is paralleled to the
secondary residual winding in the medium voltage