摘要
针对发电机出口断路器特殊的工作条件,从真空灭弧出发,选择市场上成熟的杯状和线圈式纵磁触头作为研究对象,首先分析了典型杯状和线圈触头间隙磁场分布情况,对比了2种结构磁场分布的差异。然后对2种触头的关键结构分别进行优化,利用仿真分析的方法对比了改进前后触头间隙磁场分布的改善情况。最后基于改进结构的2种纵磁触头在可拆卸真空腔体内进行不同短路电流下的燃弧试验。从试验结果看,杯状触头电弧能更好地在触头表面维持扩散态,而线圈触头存在磁场集聚,电弧"偏烧"的情况,预测在更大短路电流下杯状触头的熄弧性能和抗烧蚀能力会优于线圈触头。该文开展的触头间隙磁场和电弧试验研究为发电机出口真空灭弧室的进一步试验研究提供了重要参考依据。
For the special working conditions of circuit breaker of generator,we experimentally investigated cup-type and coil-type contacts which are mature in market from the point of view of vacuum arc extinguishing.Firstly,we analyzed the axial magnetic field distribution of typical cup-type and coil-type contacts and compared the differences for these two structures.Secondly,we optimized the key structure of contacts stated above by using simulation analysis and compared the magnetic field distribution before and after improvement.Lastly,based on two types of improved contacts,arcing tests under different short circuit currents were carried out in a removable vacuum cavity.The experimental results reveal that the diffusion state of arc can be better kept on the whole surface of the cup-type contact,and arc tends to gather and partially burn for the coil-type contact.Therefore,we predict that the cup-type contact performs better than the coil-type contact for arc extinguishing and burning erosion resistance under greater short circuit current.The research of magnetic field and arcing test carried out in this paper will supply an important basis for further experimental research of generator circuit breaker.
作者
费翔
朱志豪
袁端磊
王海燕
马明乐
FEI Xiang;ZHU Zhihao;YUAN Duanlei;WANG Haiyan;MA Mingle(Pinggao Group Co.,Ltd.,Pingdingshan 467000,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2019年第11期3700-3707,共8页
High Voltage Engineering
基金
国家电网公司科技项目(15 kV/6 300 A/80 kA真空断路器及真空灭弧室关键技术研究及应用)~~
关键词
发电机断路器
杯状触头
线圈触头
纵磁
磁场分布
燃弧试验
偏烧
熄弧性能
generator circuit breaker
cup type contact
coil type contact
axial magnetic field
distribution of magnetic field
arcing test
partial burn
arc extinguish capability
