Abstract：Built-in ultra high frequency (UHF) sensor design needs to consider the safety and some other requirements such as miniaturization, low return loss and high sensitivity. Accordingly, this paper designs a new built-in UHF sensor with nipple column for gas-insulated switchgear (GIS). The effects of short-circuit pin number and position on sensor are analyzed though simulations. Combined with flange size of GIS, the optimum design is determined. Through simulations and experiments, the performance parameters affecting the sensor are discussed. The results show that both return loss and sensitivity achieve optimal, when short-circuit pin number for 110kV GIS is 4 and short circuit needle distance from the center of the circle is 40mm. In the laboratory, the sensor is verified by high and low temperature resistance test, air tightness test and partial discharge detection. The experimental results show that the developed sensor has good performance in high and low temperature resistance test as well as air tightness test; it has good response characteristic and high detection sensitivity in internal typical partial discharge of GIS. The developed sensor can detect clear discharge UHF waveforms and the detection SNRs are greater than 10.
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2017, Vol. 32 
