Application of complex wavelet transform to suppress white noise in GIS UHF PD signals

作者：Xu Zhongrong^*; Tang Ju; Sun Caixin

来源：IEEE Transactions on Power Delivery, 2007, 22(3): 1498-1504.

DOI：10.1109/TPWRD.2007.899767

• complex wavelet transform (CWT)
• denoising
• gas-insulated switchgear (GIS)
• partial discharge (PD)
• white noise

During online partial discharge (PD), ultra-high-frequency (UHF) detection of gas-insulated switchgear (GIS), obtaining acceptable levels of sensitivity, still continues to remain a very challenging task, primarily due to strong electromagnetic interference (including white-noise, random, discrete spectral, and stochastic pulses). As white-noise interference stands in the breach existing in GIS PD UHF detection inevitably, the available suppression methods are unsatisfactory. According to the feature of white noise, the Daubechie's complex wavelet is constructed. Through the simple information (SI) and combined information (CI) of the complex wavelet transform (CWT), the denoising method of simulation signals and field signals of I'D UHF is studied by the authors. In view of the estimation parameters, the results manifest that white-noise in GIS I'D UHF signals can be suppressed effectively by the SI and CI of the CWT.

• 出版日期2007-7
• 单位重庆大学