【摘要】 分析了FFT阈值滤波和基于能量比预处理的FFT阈值滤波法,分别采用这两种方法对实际监测信号进行处理,并对比分析了两种信号处理结果。结果表明,FFT阈值滤波法采用不同的滤波系数时,信号处理结果会呈现很大的差异;基于能量比预处理法能找到能量突变的点,信号处理更具针对性,但采用能量比预处理阈值滤波过程中应当注意选取合适的窗口长度,且在信号处理的时候应当尽可能地减少局部放电信号能量的损失。更多还原

【Abstract】 Analysis was made on the fast Fourier transform(FFT) fi ltering method using threshold value and the FFT fi ltering method based on energy-ratio pretreatment. These two methods were adopted to carry out treatment for actually monitor signals, and comparison and analysis were made on two kinds of signal treatment results. The result shows that when the FFT threshold value fi ltering method adopts different fi ltering coeffi cient, the signal processing results will show great difference. The fi ltering method based on energy-ratio pretreatment can fi nd the point where energy suddenly changes, the signal treatment is more pertinent, but in the energy-ratio pretreatment value fi ltering process, appropriate window length should be adopted, and loss of partial discharge should be reduced in signal treatment.更多还原