摘要
电容器组投切断路器触头烧蚀劣化后会改变合闸预击穿时间,这不仅会影响选相合闸效果,同时也说明预击穿电弧持续时间可作为衡量触头烧蚀状态的指标之一。建立了126 kV SF_(6)断路器灭弧室内合闸预击穿过程电—流体耦合仿真模型,研究了触头劣化过程中合闸预击穿特性,并提出了预击穿时间带电检测方法。结果表明:合闸过程中场强最大点总是出现在静弧触头表面;灭弧室内SF_(6)气体密度几乎保持不变;110 kV电压等级相电压下,触头预击穿电弧持续时间随烧蚀程度变化的试验值与仿真值吻合良好。从电场畸变角度解释了随着触头的表面烧蚀劣化程度增大对应预击穿时间的变化规律,结果可为断路器选相合闸策略和触头状态评估提供理论指导。
The contact ablation and deterioration of circuit breaker after capacitor bank switching can change the pre-breakdown time of closing operation,which will not only affect the effect of phase selection closing,but also in-dicate that the duration of pre-breakdown arc can be used as one of the indicators to measure the ablation status of the contacts.An electric-fluid coupling simulation model is set up for the pre-breakdown process of interrupter of 126 kV SF_(6) circuit breaker,and the pre-breakdown characteristics of the contact in the process of contact deteriora-tion are studied.Moreover,the live detection method of the pre-breakdown time is proposed.The results show that the maximum point of the electric field strength always appears on the surface of the stationary arc contact during the closing process.The density of SF_(6) gas in the interrupter remains almost unchanged.At 110 kV phase voltage,the test value of the pre-breakdown duration of the contact with the variation of ablation degree is in agreement with the simulation value.From the perspective of electric field distortion,the variation of the pre-breakdown duration corresponding to the increase of the surface ablation deterioration of the contacts is explained.The results can pro-vide theoretical guidance for the phase selection and closing strategy of the circuit breaker as well as the state evalu-ation of the contacts.
作者
马飞越
黎炜
孙尚鹏
相中华
吴强
王尧平
王羽
MA Feiyue;LI Wei;SUN Shangpeng;XIANG Zhonghua;WU Qiang;WANG Yaoping;WANG Yu(Power Research Institute of State Grid Ningxia Electrical Power Co.,Ltd.,Yinchuan 750001,China;State Grid Ningxia Electrical Power Co.,Ltd.,Yinchuan 750001,China;School of Electrical Engineering and Automation,Wuhan University,Wuhan 430072,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第4期113-122,共10页
High Voltage Apparatus
基金
国家电网有限公司总部科技项目(5500-202135125A-0-0-00)。
关键词
SF_(6)断路器
预击穿特性
多物理场耦合仿真
选相合闸
触头状态评估
SF_(6)circuit breaker
pre-breakdown characteristic
multi-physical field coupling simulation
phase selection closing
contact status assessment
