Measurement and analysis of electromagnetic field around transformer substation and base station using wavelet transform

When transformer substation is under base station, electromagnetic fields around transformer substation is complex and especially base station perhaps is so great influenced from transformer substation that communication is interrupted. This paper mainly uses a wavelet denoising method for partial discharge (PD) signal and base station signal extraction from the electromagnetic interference existing in electrical machines such as high frequency sinusoidal noise, pulse-shaped noise .The proposed denoising method is performed through multi-resolution signal decomposition, numerical simulating base station signal and PD pulse immersed in severe noise have been investigated. In conclusion, base station signal and PD pulse can distinguished from a noisy background, thus providing the reference for EMI measurement and design.