基于振动信号时频域特征的换流变真空有载分接开关机械状态检测

Mechanical Condition Detection of Vacuum On⁃load Tap⁃changer for Converter Transformer Based on Time⁃frequency Domain Characteristics of Vibration Signal

文中针对换流变用真空有载分接开关的结构特点,开展分接开关切换过程的振动测试,分析振动信号的时频域特征,提出基于振动信号时频域特征的换流变真空有载分接开关状态检测的方法,并验证其工程可行性,实践结果证明该方法可有效检测分接开关驱动机构异常、支撑板断裂和减振器支座开裂等机械缺陷。

In this paper,according to the structural characteristics of vacuum on⁃load tap⁃changer for converter trans⁃former,vibration test is carried out during switching process in the field.Vibration characteristics in the time domain and frequency domain are studied.Based on the time⁃frequency domain characteristics of the vibration signal,a method to detect the condition of vacuum on⁃load tap⁃changer(OLTC)for converter transformer is proposed,and its engineering validity is verified.This method is proved to be effectively detect mechanical defects of vacuum on⁃load tap⁃changer,such as abnormal motor⁃drive mechanism,broken support plate and cracked absorber support.