摘要
振动法是诊断变压器运行中潜伏故障的一种有效手段,不仅能够检测出故障绕组,还能检测铁心的状况,对其进行充分的研究有良好的应用前景。文中提出了一种不空载运行变压器取得变压器铁心振动信号基频成分的负载电流法。模拟变压器实际运行时的情况,测量了不同负载电流及空载情况下变压器本体的振动加速度信号。通过拟合的负载电流与振动加速度信号基频成分的关系曲线,得到了负载电流为零时变压器振动信号基频成分的幅值,这个值与空载情况测得的振动信号基频成分相当,说明了利用这种方法可以提取出变压器铁心振动信号的基频成分。文中最后利用负载电流法对于铁心故障进行了监测,并与小波包分析法进行比较,结果证明了这种方法可初步判定铁心的状况。
The vibration method is an effective method used for on-line monitoring the power transformer delitescent fault,it can monitor not only the winding,but also the condition of core.It is a recommended method that should be studied deeply.In this paper,a method extracting cores vibration signal with operating transformer at on-load condition was introduced.The transformer抯 vibration accelerated signals at different on-load current and no-load condition were measured.From the fitted curve of on-load current versus fundamental frequency component of vibration accelerated signal,the value of fundamental frequency component was gained as the on-load current was zero,and it was almost equivalent to the fundamental frequency component of vibration accelerated signal measured at no-load condition,thus using on-load current method the fundamental frequency component of cores vibration can be acquired.The core with fault was finally monitored using the on-load current method compared with WPT method.From the result of experiment,we can see this method is very useful to estimate the condition of the transformer core
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第6期154-158,共5页
Proceedings of the CSEE
