摘要
准确计算GIS温升对于产品优化设计、缩短研发周期和降低研发成本等具有重要意义。为此,针对一台126kV三相共箱式GIS,考虑接触电阻、邻近与趋肤效应以及涡流效应的作用,首先建立了电磁–热耦合仿真模型,仿真分析了2 200 A电流条件下GIS的损耗分布及温升特性;接着为了进一步研究气流场对温升的影响,建立了GIS的电磁–热–流耦合模型,对比分析了仅计及GIS内部SF6气体流体域、同时考虑GIS内部SF6和外部空气流体域两种方法的温升计算结果;最后开展了2 200 A电流下的温升实验。结果表明:隔离开关导体的损耗密度要高于断路器导体,且接触电阻的损耗密度最大;考虑内、外流体域的计算方法精度最高,最大相对误差小于10%。研究为GIS温升特性的工程设计提供了有效的方法,也可为其他电力设备的温升计算提供技术参考。
It is very important to precisely calculate the temperature rise of GIS, which may aid the optimization design, shorten the development duration and reduce the development cost. For one 126 kV three-phase-in-one-tank type GIS, taking the contact resistance, proximity and skin effects, and eddy current effect into account, we firstly developed an electromagnetic – thermal coupled model, and then analyzed the loss distribution and temperature rise characteristics under the action of 2 200 A current. In order to further investigate the influence of gas flow, we proposed an electromagnetic – thermal – fluid coupled model for the GIS model, and compared the temperature rise calculation results based on two difference methods, i.e., only considering the GIS inner SF6 fluid domain, or considering both the GIS inner SF6 fluid domain and GIS outer air fluid domain. According to the relevant national standard requirement, experiments for temperature rise were carried out under the same current of 2 200 A. It is revealed that the loss density of disconnector conductors is higher than that of circuit breaker conductors, the calculation precision of the last method is the highest, and the relative error is less than 10%. The results can provide an effective method for optimization design of thermal characteristics of GIS, and technical references for other power equipment.
作者
吴吉
王增彬
吕鸿
王流火
孙帅
汪倩
WU Ji;WANG Zengbin;LüHong;WANG Liuhuo;SUN Shuai;WANG Qian(Electric Power Research Institute,Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China;School of Sciences,Xi’an University of Technology,Xi’an 710048,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2020年第3期815-823,共9页
High Voltage Engineering
基金
广东电网有限责任公司科技项目(GDKJXM20180145).
关键词
GIS
温升
电磁–热耦合
电磁–热–流耦合
气流场
GIS
temperature-rise
electromagnetic-thermal coupling
electromagnetic-thermal-fluid coupling
flow field
