Research on detecting receptive capacity for UHF senor using time-frequency reference method

This paper presents a method to detect receptive capacity of external ultra-high frequency (UHF) senor for gas insulated switchgear (GIS) partial discharge (PD) testing using time-frequency reference method. It is always crucial to detect PD using UHF inspection device for live GIS, while the affection of senor performance on PD detecting accuracy is very important. So this paper, analyzing the disadvantages of existing inspection method for UHF capacity, makes use of time-frequency reference method to represent the receptive capacity for UHF senor. The standard unipolar probe antenna and pulse signal source are employed to inject signal and build electromagnetic field in GTEM cell. The receptive capacity for UHF senor is computed by combining spectra curve of unipolar probe antenna with the time-domain signals, which is tested by standard unipolar probe antenna and UHF senor. This paper achieves the objective of detecting receptive capacity for three UHF sensors by building up a detecting system, and detection results indicate that the method in this paper is effective to detecting receptive capacity for UHF senor.