电力变压器局部放电超声波信号仿真分析

Simulation analysis of partial discharge ultrasonic signal in power transformer

针对变压器局部放电信号在复杂运行环境易受到较强干扰的问题,分析了干扰的传播特性,根据局部放电信号和扰动信号频率分布的特点,设计出了基于带通滤波器和小波分析法分层抑制干扰的模型,借助MATLAB仿真软件对变压器内部放电信号的传播特性进行了仿真。仿真结果表明,分层式抑制干扰方式可以有效地去除窄带和白噪干扰,并保证原始信号能量损失较小,提高了局部放电定位精度,满足了变压器局部放电绝缘在线检测的实际需要。

Aiming at the problem that the partial discharge signal of the transformer is easily disturbed in the complex operating environment, the propagation characteristics of interference are analyzed. According to the characteristics of partial discharge signal and frequency distribution of disturbance signal, the hierarchical interference suppression model is designed based on band - pass filter and wavelet analysis method and simulation is carried out by means of the propagation characteristics of MATLAB simulation software to the internal discharge signal of transformer. The simulation results show that the hierarchical interference suppression method can effectively remove the interference suppression of narrow - band interference and white noise interference, thus ensuring the lower energy loss of original signal, improving the positioning accuracy of partial discharge and meeting the practical needs of on -line detection of partial discharge in transformer.