- Methods for Selecting Mechanical Parameters of Outdoor High-Voltage Vacuum Circuit Breakers (Part 1)
- 2015/11/5 尊时凯龙人生就博电器集团
- At present, vacuum switches have been widely used in various fields at home and abroad. With the popularization and improvement of the application of vacuum switches, users are increasingly in urgent need of understanding and mastering knowledge about the principles, structures, usage, and maintenance of vacuum switches. Combining practical experience, this paper theoretically analyzes the selection principles and empirical data of mechanical parameters of outdoor high-voltage vacuum circuit breakers, providing some technical references for users to better use vacuum switches.
1. Rated Opening Distance
When an outdoor high-voltage vacuum circuit breaker is in the open state, the selection of the distance between the moving and static contacts of the vacuum interrupter is related to factors such as the rated voltage, service conditions, nature of the breaking current, contact material, and withstand voltage strength of the vacuum gap of the outdoor high-voltage vacuum circuit breaker, and mainly depends on the rated voltage and contact material. Since the rated opening distance of the vacuum interrupter has a significant impact on the insulation performance, when the rated opening distance increases from zero, its insulation level will also improve. However, when the opening distance increases to a certain value, the impact of the opening distance on the insulation performance is not significant. If the opening distance is further increased, the mechanical life of the interrupter will be seriously affected. Based on the installation, operation, and maintenance of outdoor high-voltage vacuum circuit breakers, the general selection range of the rated opening distance of outdoor high-voltage vacuum circuit breakers is as follows: 4～8mm for 6kV and below, 8～12mm for 10kV and below, and 20～40mm for 35kV.
2. Contact Travel
The selection of contact travel must ensure that the contacts can still maintain a certain pressure after wear; during opening, the moving contacts can obtain a certain initial kinetic energy, improve the initial opening speed of the switch, break the welding points, reduce the arcing time, and increase the dielectric recovery speed; during closing, the contact spring can be used to obtain smooth buffering and reduce bouncing.
This paper is compiled and organized by DAYA Electrical Group Co., Ltd. (https://www.hygraphics.com/). Please indicate the source when reprinting. - Methods for Selecting Mechanical Parameters of Outdoor High-Voltage Vacuum Circuit Breakers (Part 2)The Importance of Solid Insulated Ring Main Units in Smart Distribution Networks
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