Effect of Potential Distribution of Main Shield on Internal Insulation Performance of Vacuum Interrupter

doi:10.16183/j.cnki.jsjtu.2023.553

Abstract

Abstract:

As an environmentally friendly switchgear technology, vacuum circuit breakers have a wide range of application prospects. However, both single and break vacuum circuit breakers face the issues of uneven potential distribution in the main shielding case of the vacuum arc extinguishing chamber, with more prominent potential imbalance in the tank structure. To study the effect of the potential distribution of the main shielding cover on the internal insulation performance of a vacuum interrupter, a partial voltage model of the main shielding case of a vacuum interrupter is established. The COMSOL software is used to calculate and analyze the effect of the main shielding case potential change on the internal electric field by placing an external capacitor around the vacuum interrupter to adjust the share of the main shielding case potential in the inter-fracture potential. Based on the simulation results, power frequency and lightning impulse withstand voltage experiments are conducted on a 10 kV vacuum arc extinguishing chamber at different main shielding case voltages. The results show that the internal electric field strength decreases and then increases as the main shielding case potential rises, with the minimum peak field strength inside the vacuum interrupter occurring at 50% main shielding voltage. The simulation and experimental results are basically consistent. At a contact distance of 6 mm, the power frequency breakdown voltage increases by 5.4% and the lightning impulse voltage increases by 6.7% when the potential of the main shielding case is 50% of the inter fracture potential. This study provides reference for improving the internal insulation performance of vacuum arc extinguishing chambers and for the application of higher voltage level vacuum circuit breakers.

Key words: vacuum interrupter, main shield potential, electric field simulation, insulation performance

CLC Number:

TM561

CHENG Xian, LI Guanjun, GE Guowei, DU Shuai, ZHANG Wanlong. Effect of Potential Distribution of Main Shield on Internal Insulation Performance of Vacuum Interrupter[J]. Journal of Shanghai Jiao Tong University, 2025, 59(10): 1546-1557.

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电极	1	2	3	4
1	0.4273	5.9527	1.4195	1.0710
2	5.9527	0.7127	5.8175	1.9235
3	1.4195	5.8175	0.6031	1.8482
4	1.0709	1.9234	1.8484	10.0531