Abstract: An LS Peano fractal antenna, which integrates the self-similarity and spatial filling features of fractal technology, was designed for detecting the ultra- high frequency signals generated by gas insulated switchgear (GIS) partial discharge (PD). Firstly, we analyse the design principle of a miniaturised antenna based on the LS Peano fractal curve, using ANSYS HFSS to simulate and design the LS Peano fractal antenna. Then we made the antenna object according to the optimised simulation results, and the standing wave ratio of this antenna was tested by vector network analyser. Finally, the GIS PD test platform was built in a laboratory, and PD trials involving a metal protrusion defect are conducted therewith. The test results show that: the LS Peano fractal antenna has ellipsoidal directivity the antenna is small, the actual size is only 27.6 mm x 27.6 mm x mm the measured results indicate that the voltage standing wave ratio (VSWR) of this antenna is less than 4.5 in the range from 300 MHz to 3 GHz, which has better partial discharge monitoring ability the VSWR of this antenna is less than 2 in the range from 1.1 GHz MHz to 3 GHz, which has a higher density of monitoring partial discharge the laboratory test results show that the LS Peano fractal antenna offers good performance, and can therefore be applied to on-line PD monitoring applications.

Keywords: Gas insulated substation, LS Peano fractal antenna, Miniaturization, Partial discharge, Ultra-high frequency.
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