基于电-热流场双向耦合的直流继电器温升特性仿真研究  

Simulation Research on Temperature Rise Characteristics of DC Relay Based on Bidirectional Coupling of Electromagnetic-Heat Flow Field

作　　者：于人杰 王刚 王亚宾 唐俊平 李兴文[1] YU Renjie;WANG Gang;WANG Yabin;TANG Junping;LI Xingwen(State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;Sanyou Corporation Limited,Dongguan 523000,China)

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [2]三友联众集团股份有限公司,广东东莞523000

出　　处：《电器与能效管理技术》2024年第1期18-23,共6页Electrical & Energy Management Technology

基　　金：陕西省科技计划项目(2022TD-59)。

摘　　要：高压直流继电器体积小、散热能力有限,长期工作下存在局部过热的风险,发热严重时甚至影响到接触稳定性和继电器工作寿命。针对200 A直流继电器,综合考虑导体回路通电下欧姆损耗发热,在大空间的自然热对流、热传导以及热辐射、材料电阻率随温度变化等因素,建立继电器在额定工况下电-热流场双向耦合模型,设置电阻率随温度变化函数,进行耦合计算。最后,搭建对应的样机测温平台,对仿真正确性进行验证。结果表明双向耦合结果比单向耦合结果高约5.1%,与实验测量值误差小于6.2%,验证了电热流场双向耦合的有效性。High voltage DC relays have small size and limited heat dissipation capacity.There is a risk of local overheating under long-term operation.It can even affect the contact stability and the working life of the relay when the heating is serious.Aiming at the 200 A DC relay,comprehensively considering the ohmic loss heating of the conductor circuit under power,and the natural heat convection,heat conduction and heat radiation of the relay in large space,the change of material resistivity with temperature and other factors,the bidirectional coupling model of the relays under rated working conditions is established,the resistivity change function with temperature is set,and the coupling calculation is performed.Finally,the corresponding temperature measuring platform of the prototype is built to verify the correctness of the simulation.The results show that the bidirectional coupling results are about 5.1%higher than the unidirectional coupling results,and the error with the experimental measurement is less than 6.2%,which can verify the validity of the bidirectional coupling of the electric heat flow field.

关 键 词：直流继电器 温升 电热流场仿真 双向耦合 

分 类 号：TM581[电气工程—电器]