Abstract The vacuum interrupter of transmission grade is an urgent industry-level problem to be solved. In order to overcome the insulation bottleneck of single-break vacuum interrupter and the complex structure of multi-break series, this paper innovatively proposes an integrated high-voltage vacuum interrupter structure based on two-gap asynchronous linkage. The structure adopts the asynchronous linkage of the auxiliary gap and the main gap in series, and the auxiliary gap assists the main gap insulation and arc extinguishing, and controls the opening speed of the two gaps through the intermediate self-driving mechanism, so that the main and auxiliary gaps can be opened according to the preset requirements. This structure uses an operating mechanism structure more simple than the multi-break series technology. Its size is similar to that of single-break vacuum interrupter, and it can also improve the insulation degree of single-break vacuum interrupter while being smaller than the size of multi-break series connection. It is expected to realize the engineering application of vacuum interrupter with voltage level of 252 kV and above. In this paper, the electric field simulation model of the integrated high-voltage vacuum interrupter with two-gap asynchronous linkage is established. The electric field simulation of the model is carried out by COMSOL software. The influence of the opening distance of the main and auxiliary gaps and the structure of the shielding cover on the relationship between the electric field intensity and the voltage distribution is obtained. In addition, according to the equivalent capacitance obtained by simulation, the influence of the direction of the inlet and outlet lines on the voltage distribution is analyzed in principle. Aiming at the problem of different voltage division between main and auxiliary gaps caused by different directions of inlet and outlet lines, voltage division measures such as shielding cover structure and annular ceramic grading capacitor are proposed, and the effects of these two measures on electric field improvement are analyzed. The results show that when the static end cover is the outlet end and the moving end cover is the inlet end, the main gap spacing is 60 mm and the auxiliary gap spacing is 30 mm, which can meet the distribution of the partial pressure relationship according to the size of the gap spacing. Compared with the long gap spacing of 60 mm, the maximum electric field intensity is reduced by 27.3%. Although the shielding cover structure can meet the requirements of two-way breaking, it will increase the internal field strength of the vacuum interrupter and reduce the internal insulation. The external parallel ring ceramic grading capacitor can meet the requirements of bidirectional breaking. When the inlet end is in the static end cover, the maximum electric field strength of the external parallel ring ceramic grading capacitor vacuum interrupter is about 30% lower than that of the non-parallel capacitor vacuum interrupter. The feasibility and effectiveness of the integrated high-voltage vacuum interrupter structure based on two-gap asynchronous linkage are preliminarily explained. The research provides new ideas and methods for the development of high-voltage vacuum interrupter.
Ge Guowei,Wang Wenbo,Cheng Xian等. Electric Field Design of Integrated High-Voltage Vacuum Interrupter Based on Two-Gap Asynchronous Linkage[J]. Transactions of China Electrotechnical Society, 2024, 39(17): 5555-5564.
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