摘要
本文在传统方法的基础上,提出了一种新的基于联合时频分析的故障诊断方法。该方法首先根据滤波后的冲击信号得到差异电流信号,然后对差异信号进行联合时频分析,得到时频分布图。不同的时频分布图反映不同的故障特征,不同的故障反映在时频分布图上也是不同的。通过建立故障时频分布图数据库,就可以实现电力变压器故障的自动定位、识别。由于该方法完全由计算机完成,较传统方法准确性高,应用前景更为广阔。
Based on conventional methods, this thesis shows a new method based on the joint time frequency analysis. First, we get the difference current signal, then make joint time frequency analysis and get the joint time frequency distribution. Different fault has different joint time frequency distribution. We can establish fault time frequency distribution database, and realize fault discrimination automatically. The method operated by computer wholly, so it has better accuracy and more application space.
出处
《电源技术应用》
2008年第12期39-41,共4页
Power Supply Technologles and Applications
关键词
电力变压器
故障诊断
联合时频分析
electric transformer
fault discrimination
joint time frequency analysis
