The structure and principle of three on-line oil filters of the on-load tap-changer in transformers are introduced. Their applications are compared one another.
介绍了三种变压器有载分接开关带电滤油装置的结构和原理，并对其应用进行了比较。
2
The paper introduces a transformation by PLC and frequency-changer in the light of current lashing problem of drawing-oil tube cleaning machine in oil field enterprises.
本文针对油田企业中抽油管清污机中存在的冲击问题，用PLC、变频器等对其控制进行了改造。
3
The reason is analysed for oil leakage of on-load tap-changer. According to the on-site measuring result of this OLTC, some correspondent treatment methods are pointed out.