中压开关柜温升问题研究  

Research on temperature rise of medium voltage switchgear

作　　者：王军委 邓小玉 孙鹏程 Wang Junwei;Deng Xiaoyu;Sun Pengcheng(XJ Electric Co.,Ltd,Xuchang,He’nan 461000)

机构地区：[1]许继电气股份有限公司,河南许昌461000

出　　处：《电气技术》2020年第12期56-61,共6页Electrical Engineering

摘　　要：针对KYN28A-12/4000规格开关柜存在的风机数量多、总功率大,温升指标仅能满足国标要求、裕度不大等问题进行了研究,分析了目前柜体温升薄弱点主要集中在触臂与固封极柱连接处及触头盒内部,其产生原因有柜体设计载流余量不足和关键部位散热不通畅两个方面。通过样机试制及试验验证提出了两点改进措施。结果表明,对4000A规格的手车断路器选用弹簧触指、敞开式触头盒和一体化静触头进行优化设计,可以有效减小动静触头间的啮合力,减少爬坡问题,并且温升试验也能满足要求。In view of the problems existing in KYN28A-12/4000 switchgear,such as the large number of fans,the large total power,the temperature rise index can only meet the requirements of the National Standard and the small margin,etc.,it is analyzed that the weakness of the temperature rise of the cabinet mainly lies in the connection between the contact arm and the fixed pole column and the inside of the contact box.Two improvement measures are put forward through trial production and experimental verification.The results show that the optimal design of 4000A hand truck circuit breaker using spring touch,open contact box and integrated static contact can effectively reduce the meshing force between the dynamic contact and static contact,and reduce the problem of hill climbing,and the temperature rise test can also meet the requirements.

关 键 词：敞开式触头盒 弹簧触指 爬坡 一体化静触头 

分 类 号：TM591[电气工程—电器]