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Ultra-high frequency (UHF) detection method can effectively detect the signals of partial discharge (PD) in electrical equipment. Hence the authors designed a sensor of miniaturized planar spiral antenna for detecting PD in gas insulated substations (GISs), which is sine-wave meandered based on the traditional Archimedean spiral antenna in order to reduce the antenna’s size. The test results indicate that this antenna has a wide-frequency band of 0.92~3GHz in terms of the voltage standing wave ratio (VSWR) which is smaller than 2. The antenna is smaller and its structure is simpler, its diameter is 97mm and its height is 51mm; Besides, this antenna has an ultra-wideband, great directivity and the feature of omnidirectional radiation. Therefore, the proposed antenna is quite promising for PD on-line detection applications

A Study on a Miniaturized Planar Spiral Antenna for Partial Discharge Detection in GIS