基金项目:
国家自然科学基金(51407163;
51477024;
51777025);
中国博士后科学基金(2017M622370);
河南省高校重点科研项目(16A470014;
19A470008);
Project supported by National Natural Science Foundation of China (51407163, 51477024, 51777025), China Postdoctoral Science Foundation (2017M622370), Key Scientific Research Projects of Colleges and Universities in Henan (16A470014, 19A470008);
In order to investigate the distribution and influence of the unbalanced magnetic field (BMF) in multi-break VCBs, the concept of the magnetic arc blow in multi-break VCBs is firstly proposed and the magnetic arc blow is caused by unbalanced magnetic field which is produced by the interaction between each breaks and the connection bus is analyzed. The magnetic field model of the double-break VCBs in different configurations is established. The magnetic field distribution is calculated by the Ansoft Maxwell. Based on the simulation data of the magnetic field in double-break and single-break VCBs, the vector calculation is used to calculate the unbalanced magnetic field. The laws of the unbalanced magnetic field influenced by the configuration and vacuum arcs are obtained. The simulation results indicate that the BMF of the double-break VCBs is below 30 mT with different configuration and distance when the main current is 10 kA. The BMF decreases as the distance of the vacuum interrupters in double-break VCBs. The magnetic field shield, which is achieved by smearing the magnetic material on the copper shield, is proposed to restrain the BMF in double-break VCBs. The BMF and optimal method is obtained which is useful to the configuration and optimization design of the multi-break VCBs from the aspect of the magnetic field distribution.
KEY WORDS :multi-break VCBs;unbalanced magnetic field;magnetic field distribution;magnetic arc blow;magnetic field shield;
多断口真空开关磁偏弧的机理为:真空电弧与横向磁吹的相互作用,对此在低压直流开断中研究较多,Pedrow P D研究了故障电流磁场参数、分流电容、杂散电感参数等对真空电弧电流转移过程的影响,并测量了转移过程中的真空电弧等离子体密度[13]。在电流>6 kA时,Emtage P R提出利用横向磁吹和分流电容共同作用,并应用于故障限流[14]。Kim M J对电压22.9 kV故障限流器的技术参数和限流效果进行了分析,故障限流最大达到12.5 kA[15-16]。Hyun O B在上述混合型超导限流器加入IGCTs或则IBGTs单元提高转移的可靠性[17]。Fedorov V A分析了非均匀磁场、横向磁场、分流电容参数对直流真空电弧熄灭过程的影响,得到横向磁场能够增加电弧电压和小电流下电弧的不稳定性的结论,进而有利于直流开断过程。在此基础上基于磁流体模型,通过分析磁场作用下的离子运动轨迹,分析了电流开断阈值与磁场的关系[18-20]。电流转移成败可通过Weilbull分布描述其转移成功率[21-22]。
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