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Improvement of AMF distribution in the inter-contact gap of VCB

机译：改善VCB接触间隙中AMF的分布

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摘要

Nowadays, many manufacturers of vacuum circuit breakers (VCB) apply the axial magnetic field (AMF) to stabilise the electric arc diffusion during current breaking process. In many papers, various designs of contacts are proposed to improve the AMF distribution between circuit breaker's contacts. In the present paper, some methodological aspects of AMF investigations have been presented and discussed. In the beginning, a short explanation of AMF influence on arc behaviour has been presented. A simplified physical model of phenomena considered has been applied for this purpose. The above analysis indicates that special attention should be paid to reach possibly high value of the axial magnetic field density especially in the peripheral electrode region. An own laboratory stand for AMF measurements has been described. Measurement and computational results of AMF distribution have been compared. The computations have been done with a commercial software package Maxwell (Ansoft) based on the finite element method (FEM). Good convergence of the results compared indicates that AMF can be investigated in experimental as well as in theoretical way. The numerical analysis presented enabled to select the contact configuration which ensures more stable arc behaviour during the circuit breaking process. Images of arc behaviour registered with a high speed camera for a new contact construction as well as contacts known from industrial practice have been presented.
机译：如今，许多真空断路器（VCB）制造商都采用轴向磁场（AMF）来稳定电流断开过程中的电弧扩散。在许多论文中，提出了各种设计的触头，以改善断路器触头之间的AMF分布。在本文中，已经提出并讨论了AMF调查的一些方法论方面。首先，简要介绍了AMF对电弧行为的影响。为此目的，已考虑了简化的现象物理模型。上述分析表明，应特别注意轴向磁场密度可能达到很高的值，尤其是在周边电极区域。已经描述了自己的用于AMF测量的实验室支架。比较了AMF分布的测量和计算结果。已经使用基于有限元方法（FEM）的商业软件包Maxwell（Ansoft）进行了计算。比较结果的良好收敛性表明，AMF既可以通过实验方式也可以通过理论方式进行研究。所提供的数值分析能够选择触点配置，以确保在断路过程中更稳定的电弧行为。已经呈现了用高速相机记录的用于新触点结构以及工业实践已知的触点的电弧行为图像。

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