变压器内典型油纸绝缘缺陷的高频局部放电传播特性研究

Time-frequency Propagation Characteristics of Transformer Partial Discharge Based on High Frequency Method

基于高频法检测局部放电技术已经相对成熟,为了现场检测和对变压器运行状况做出准确诊断,文中提出了利用高频法检测分析放电信号传播特性的方法。通过建立仿真模型确定了频带选择范围,并建立试验平台,利用多传感器同时测量和采集实时信号,对比研究了局部放电在变压器内部传播后以及在不同位置放电时高频信号的频谱特性。结果表明,高频局部放电检测法能够对变压器缺陷进行高效检测且高频信号变化规律明显,为实际的波形检测提供了试验依据。

The technology of detecting partial discharge based on high frequency method has been relatively mature. For on-site detection and accurate diagnosis of transformer operating condition, a method for detecting and analyzing the propagation characteristics of discharge signals is proposed by using the high frequency method. A simulation model is established to determine the band selection range, and a test platform is built to simultaneously measure and acquire of real-time signals using multiple sensors. Comparison of the spectral characteristics of the partial discharge high-frequency signals between after propagation inside the transformer and at different positions. The results show that the high-frequency partial discharge detection method can effectively detect transformer defects and has a clear variation rule of high-frequency signal, providing experimental basis for actual waveform detection.