摘要
万能式断路器广泛应用于低压配电网,其温升特性关乎设备安全和系统稳定运行。首先论述了基于电磁热流多物理场耦合方法的万能式断路器温升计算流程和基本原理;接着建立了万能式断路器的三维仿真计算模型,并确定了仿真计算的边界条件,完成了万能式断路器在自然对流下的稳态温升仿真,获得了断路器各组件的温升特性;最后为了验证计算结果开展了万能式断路器的温升实验,各接线端子温升计算误差在10%以内,结果表明提出的基于电磁热流多物理场耦合的温升仿真方法是有效的。
Air circuit breaker is widely used in low voltage distribution system.Its temperature-rise characteristics have critical effects on the safety of power equipment and system.Firstly,the calculation process and basic principle of electromagnetic-thermal-fluid multiphysics coupling method to calculate the temperature rise of the circuit breaker are discussed.Secondly,the simulation calculation model of the air circuit breaker is built,and the boundary conditions of the simulation calculation are discussed.After that,the steady-state temperature rise simulation of the air circuit breaker under natural convection is completed,and the temperature rise characteristics of each component of the circuit breaker are obtained.Finally,in order to verify the calculation results,the temperature rise test of the air circuit breaker is carried out.The results show that the temperature rise calculation error rates of the terminals are less than 10%,which proves the validation of the proposed electromagnetic-thermal-fluid multiphysics coupling method to calculate the temperature rise.
作者
屈建宇
徐宏宇
QU Jianyu;XU Hongyu(State Grid Xi’an Electric Power Supply Company,Xi’an 710032,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《电器与能效管理技术》
2021年第4期40-45,共6页
Electrical & Energy Management Technology
关键词
万能式断路器
温升
电磁热流
有限元
自然对流
air circuit breaker
temperature rise
electromagnetic-thermal-fluid
finite element
natural convection
