中压开关柜梅花触头接触故障下的温升特性研究  

Study on Temperature Rise Characteristics of Contact Failure of Tulip Contacts of Medium-voltage Switchgear

作　　者：孙韬 赵莉华[1] 龙辰 王泽龙 任俊文 黄小龙 SUN Tao;ZHAO Lihua;LONG Chen;WANG Zelong;REN Junwen;HUANG Xiaolong(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,成都610065

出　　处：《高压电器》2023年第5期130-138,共9页High Voltage Apparatus

基　　金：中央高校基本科研专项资金(YJ201852)。

摘　　要：中压开关柜梅花触头接触故障所导致的发热问题会显著影响开关柜的电气和绝缘性能,对电力系统的安全稳定运行造成隐患。为探究中压开关柜的温升问题,文中建立了具有完整梅花触头结构的温度场和流场耦合中压开关柜模型,运用有限元分析法,对正常情况和梅花触头接触故障下中压开关柜内温度场和流场分布进行了仿真分析。结果表明:正常情况下,中压开关柜温升最高处为断路器触头,柜内空气循环流动方向会使三相导体温升存在差异。梅花触头接触故障下故障点温升最高,故障对开关柜温升的影响较大,对流场的影响较小。The heating problem due to contact failure of tulip contact of medium voltage switchgear will significantly affect electrical and insulation performance of the switchgear and cause a hidden danger to the safe and stable operation of the power system.In order to explore the temperature rise problem of MV switchgear,the temperature filed and flow field coupling MV switchgear model with complete tulip contacts structure is set up in this paper.The finite element analysis method is used to simulate and analyze the temperature field and flow field distribution in MV switchgear under normal conditions and tulip contacts failure.The results show that under normal case the highest temperature rise of the medium-voltage switchgear is in the contact of circuit breaker,and the air circulation flow direction inside the switchgear will cause the temperature rise of three-phase conductor to have difference.The temperature rise of the the fault point of tulip contacts in the case of contact fault is the highest.The influence of the fault on the temperature rise of the switchgear is bigger,but on the flow field is smaller.

关 键 词：开关柜 梅花触头 接触故障 温升特性 建模仿真 

分 类 号：TM591[电气工程—电器]