摘要详情

ID / 提交时间

87 / 2024-04-11 15:00:04

标题

Optimization of Buckling Stability of Spring Operating Mechanism of Vacuum Circuit Breaker Based on Tolerance Chain Simulation

关键字

spring operating mechanism,buckling stability,tripping force,tolerance chain simulation

主题及专题

1)Emerging HV Switching Technologies

状态

终稿

作者

Yimin You / School of Electrical Engineering and Automation, Xiamen University of Technology

Xingyu Li / School of Electrical Engineering and Automation, Xiamen University of Technology

Shuling Zhong / School of Electrical Engineering and Automation, Xiamen University of Technology

摘要

Abstract—In modern power systems, vacuum circuit breakers are important power equipment in the power system, and the buckling stability of their spring operating mechanisms is crucial to the reliable operation of the entire system. However, in practical engineering applications, even if the products are precisely processed according to the drawings and their tolerances fully meet the design requirements, there may still be situations where buckling is unsuccessful or unbuckling is difficult. This situation often occurs due to insufficient consideration of the complexity of interactions between parts and the diversity of actual operating conditions during design.

This study aims to address this practical problem by deeply analyzing the tripping mechanism of the spring operating mechanism of vacuum circuit breakers, and focusing on the impact of the buckling amount on the closed holding state of the mechanism. By establishing a dimensional chain model and using tolerance chain simulation methods, this study reveals the deficiencies in the tolerance fit of existing spring operating mechanisms, and points out the possible failures or defects caused by these deficiencies. The study found that key dimensional parameters such as the distance from the transmission toggle lever axis to the opening roller mounting hole and the diameter of the opening half-axis have a significant impact on the buckling stability. When the tolerances of these key dimensions exceed a reasonable range, it may lead to insufficient buckling, resulting in unsuccessful buckling; conversely, if the buckling amount is too large, it may lead to the failure of the tripper to effectively open, causing difficulty in tripping. The existence of these problems seriously affects the reliability and safety of vacuum circuit breakers.

In the analysis process, we paid special attention to the two indicators of contribution and sensitivity. The contribution indicates the specific impact of a dimensional parameter change on the performance of the final product, helping us determine which dimensional tolerances are the focus of optimization. Sensitivity indicates the sensitivity of product performance to a single dimensional change, allowing us to know which small changes may lead to large performance fluctuations. Fig. 1 shows the simulation results of the buckling tolerance chain.

Fig. 1. Simulation results of the buckling tolerance chain.

Subsequently, this study adopted multiple optimization schemes and analyzed their performance in the worst case through tolerance chain simulation. Through comparative analysis, we found that one of the schemes performed better in reducing the buckling amount and tripping power, which can effectively solve the tripping difficulty problem that may occur during low-voltage operation. In addition, this study also considered the impact of deformation on design dimensions and tolerances, and evaluated the influence of deformation on the closing-holding buckling tolerance chain by adding the deformation obtained from stress simulation to the tolerance chain simulation. The results showed that after considering the deformation, there was little change in the buckling amount, which further verified the effectiveness of the optimization measures.

The findings of this study not only provide important references for the design and manufacturing of vacuum circuit breakers but also offer a new research method and approach for researchers in related fields. Furthermore, it effectively enhances the design reliability and operational performance of the spring operating mechanism, providing robust support for the stable operation of power systems.