高压自愈式电容器典型交流工况下温度场分析及优化设计  

Temperature Field Analysis and Optimization Design of High-voltage Self-healing Capacitor at Typical Operating Conditions in Power System

作　　者：尹婷[1,2] 严飞[1,2] 王子建[3] 何慧雯[1,2] 李浩原 

机构地区：[1]中国电力科学研究院,北京100192 [2]电网环境保护国家重点实验室,武汉430074 [3]华北电力大学河北省输变电设备安全防御重点实验室,保定071003 [4]华中科技大学电气与电子工程学院,武汉430074

出　　处：《高电压技术》2016年第12期3996-4004,共9页High Voltage Engineering

摘　　要：温度是影响高压自愈式电容器工作性能的重要影响因素。针对高压自愈式电容器在典型工况下的温度场分布进行了仿真与试验研究,并就其结构设计给出了合理化建议。在对电容器结构进行合理简化和基本假设的基础上,基于Ansys软件建立了高压自愈式电容器三维温度场仿真模型,为了验证仿真模型的正确性,设计并试制了两种结构类型的电容器试品,进行了不同工况下的热稳定性能试验,对电容器内部及外壳温度进行了实际测量。通过3种试验条件下电容器各点温升实测与仿真值对比,误差在1℃以内。根据研究结果,考虑减小整体损耗的角度看,对于电容器的设计,聚丙烯膜宽可选较低值,膜厚可选较高值,电容器元件的摆放方式以及电容器元件直径的对散热影响不大,可按较易的出线方式选择。在此基础上对11/3^(1/2)kV、334 kVA高压自愈式电容器内部结构进行了优化设计,并采取第二种仿真软件COMSOL进行了复验,两种仿真软件在相同条件下的温度仿真结果表明偏差<1℃。Temperature is an important factor affecting the performance of high-voltage self-healing capacitor. Conse- quently, the temperature field distribution of high-voltage self-healing capacitor at typical operating conditions in power systems are simulated and experimentally studied. At the same time, some suggestions for its architecture optimization are given. On the basis of reasonable simplification and basic assumption, a 3D temperature field model of high-voltage self-healing capacitor is formulated based on finite element method-Ansys. To validate the models, two types of high-voltage self-healing capacitors are designed and manufactured. The heat stability tests about the two capacitors are conducted in thermostat. The internal and surface temperatures of the capacitors are measured and the results validate the formulated model. By comparing the measured values of the temperature rise of the capacitors with the simulated values through 3 kinds of test conditions, the error is less than 1℃. Based on theoretical analysis and numerical calculations, some important aspects in the process of design of high-voltage self-healing capacitor are given, and choosing the wider and thicker polypropylene film can be helpful for reducing the total loss. The arrangement of capacitor components and diameter of capacitor component have little effect on the loss, thus can be selected according to the easier way out. On the basis of the above investigations, the optimal design about a high-voltage self-healing capacitor with a nominal voltage of 11/3 kV and a capacity of 334 kVA is presented an reinspected with the different simulation tool COMSOL. The emula- tion results of the two simulation software under the same conditions are within 1 ℃.

关 键 词：自愈式电容器 温度场 发热计算 有限元 优化设计 

分 类 号：TM53[电气工程—电器]