Research and Analysis of UHF Partial Discharge based on 35kV Switch Cabinet

With the continuous improvement of power supply reliability requirements, it puts forward higher requirements for equipment management units. With the increase of equipment operation life, affected by damp, vibration and other factors, it will cause poor contact of equipment conductor, which will cause partial discharge phenomenon and insulation performance decline, and then seriously affect the safe and stable operation of equipment. This paper analyzes the characteristics of the electric field distribution between the shielding layer of the bushing and the voltage-equalizing spring, and proposes an improved structure of the voltage-equalizing spring, which is verified by the withstand voltage test and partial discharge test, and achieves good test results.