摘要
为了分析断路器梅花触头温度分布规律,采用虚拟材料法描述了梅花触头触指的接触电阻特性,结合电磁-应力-温度有限元数值计算仿真,建立了梅花触头温度场数值仿真模型。利用上述模型分析了额定电流与短路工况下梅花触头的温升特性,计算结果表明虚拟材料法能够同时描述触指端部的收缩电阻与附加电阻,从而模拟接触交界面的局部高温。随后,进一步分析弹簧压力与压力均匀性对梅花触头温度场的影响,计算结果表明,弹簧压力减小及触指压力不平衡均会导致梅花触头温升增加。所提方法能够为断路器梅花触头设计与过热缺陷分析提供参考。
In order to analyze the temperature distribution of circuit breaker tulip contact,thermal field simulation model for tulip contact is built combined with the electromagnetic-stress-thermal coupled finite element simulation and virtual material method which models the contact resistance characteristics of tulip contact.The temperature rise characteristic of tulip contacts under rated current condition and short-circuit condition is analyzed with the model.Results show that virtual material method can describe the shrinkage resistance and additional resistance at the end of the contact finger simultaneously,and is capable to simulate the partial high temperature of the contact interface.Then,the influence of spring pressure and pressure uniformity on the thermal field of tulip contact is analyzed.Results show that the decrease of spring pressure and the imbalance of contact finger pressure may lead to the increase of the temperature rise of the tulip contact.The proposed method can be used as a reference for the design and the overheating analysis of tulip contact.
作者
张爽
张璐
潘晓敏
夏循进
ZHANG Shuang;ZHANG Lu;PAN Xiaomin;XIA Xunjin(Journal of Wuhan Institute of Shipbuilding Technology,Wuhan 430072,China;State Grid Henan Power Company,Zhengzhou 450000,China;Wuhan NARI Limited Liability Company,State Grid Electric Power Research Institute,Wuhan 430074,China)
出处
《南方电网技术》
CSCD
北大核心
2020年第11期74-80,共7页
Southern Power System Technology
基金
国家海洋局“十三五”海洋经济示范区产业化项目(NBHY-2017-Z2)。
关键词
梅花触头
温度场
虚拟材料法
电磁-应力-温度
有限元
tulip contact
thermal field
virtual material method
electromagnetic-stress-thermal
finite element
