用于单断口126kV真空灭弧室的三分之二匝线圈电极的装配角研究

摘要

The objective of this research is to compare mounted angles between a pair of 2/3 coil-type AMF electrodes in a 126 kV single-break vacuum interrupter.Three kinds of mounted angles are investigated,which have 0°,30°and 60°slot shift between a pair of contact plates,respectively.A comparison of the mounted angles is made based on the distribution of axial magnetic flux density,the AC and DC resistance,the anode discharge mode,and the contact erosion pattern.The axial magnetic flux density,both in the intermediate plane of the electrode gap and on the contact plate under each mounted angle case is compared.The AC and DC resistance for each case are also analyzed.A high-speed Charge Coupled Device (CCD) camera is used to record the arc discharge mode under different mounted angle cases.After 6 interruptions with 40 kA arcing current,the contact erosion conditions with different mounted angle cases are compared.The simulation and experiments all show that when the mounted angle is 30°,the electrode has the smallest resistance and the maximum effective axial magnetic,and it exhibits the best current loading and breaking performance.%在三分之二匝线圈电极中存在三种可以采用0°、30°和60°的装配角,装配角不同将影响电极的电磁场性能,并对真空灭弧室的开断和载流能力产生影响.本文使用电磁场仿真和试验的方法研究用于单断口126 kV真空灭弧室的三分之二匝线圈电极的装配角问题.针对采用不同装配角的电极,比较了磁场分布、回路电阻、电弧形态以及燃弧后触头表面烧蚀程度.使用电磁场仿真的方法计算了采用不同装配角的电极在不同开距时的磁场分布,以及闭合状态下的回路电阻值.使用高速摄影仪拍摄了不同装配角的电极在可拆真空灭弧室中的电弧形态,每对电极各进行了6次40 kA电流燃弧试验,并对燃弧后的触头表面状态进行了比较.研究结果表明,装配角为30°时三分之二匝线圈电极产生的回路电阻最小,纵向磁场最强,对应的载流和开断能力最强.