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Partial discharge (PD) is a small electrical spark which happens within the insulation of medium and high voltage electrical assets. It is important to note that the discharge will erode the insulation and eventually result in disastrous insulation failure. Thus, PD detection is a crucial issue in high voltage insulation area. However, for the on-site field PD measurement, the high frequency (HF) PD signals detected by sensors are vulnerable to interference and background noise. This has a negative effect on high voltage apparatus fault diagnosis and localization accuracy. For that reason, noise suppression becomes an urgent and vital issue of field HF PD signal testing. This book is aimed to presents the design for a filtering circuit for suppressing the noise along with PD in high frequency measurement. A filtering circuit has been designed and developed for the purpose to filter out the noise along with PD with decent accuracy and efficiency. Then, performance analysis is conducted and found out that the designed filter for PD noise suppression in high frequency is successfully developed.