描述
三、110kV及以上互感器故障的处理方法
110kV及以上有缺陷的互感器的处理方法主要有吊芯检查、修渗漏、更换密封垫、换油、真空干燥、结构改进等。
对于器身受潮轻微且只能在现场处理的,一般采用真空热油循环处理,当热油进入互感器内部后,绝缘介质受热,其内部水分就会蒸发,由互感器顶部及滤油机排出,通过不断的循环达到干燥的目的。
采用真空干燥处理受潮器身时,真空度要维持在750mmHg柱以上,器身进入烘房后,温度要从低到高缓慢增加。温度在40℃时烘48h,到60℃时烘48h,到75℃时48h,最后到95℃时,每小时应探测绝缘电阻一次,当其值在6~8h保持不变或变化不大时,则真空干燥完毕。实践证明,把烘房上下限温度调节在10℃时,干燥效果最好,应当注意的是在干燥过程中为防止密封垫受热老化,要将其取下,并把一次末端和二次出线端小瓷套松开。对储油柜密封不良及密封胶囊质量较差的,可以采用加装波纹膨胀器的方法来改变密封性能;对二次板受潮导致的tgδ偏大的问题,可以通过更换原二次接线板,更改二次出线小套管的办法解决。
四、结束语
通过对互感器的检查及对试验数据的分析,可以判断出互感器的故障情况,从实际对故障设备的解体大修情况来看,与笔者所述基本吻合,但高压互感器的故障情况种类繁多,原因错综复杂,还需要在运行实践中不断总结、创新经验。
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