摘要
针对某用于高海拔的12 kV真空断路器发生的工频耐压试验击穿故障,采用Solid Works三维建模软件建立仿真模型,通过Ansys Workbench对其进行静电场仿真,得到了断路器的等电位线分布图及电场分布云图。通过分析等电位线分布图及电场分布云图,找到了电场集中的位置并发现该产品发生工频耐压试验击穿故障的原因:是由于该产品绝缘拉杆与极柱伞裙设计不合理,导致高、低压电位分布发生畸变引起。在保障设备满足安全运行和经济性最优的前提下,提出了通过优化绝缘拉杆伞裙和极柱伞裙布置的方法增大空气净距离的优化方案,并对优化后的模型进行仿真验证,优化后的空气域场强最大值从优化前的3.31×10~6mV/mm降低到优化后的2.82×106mV/mm,降幅达到14.8%;再按照GB/T 20635—2006《特殊环境条件高原用高压电器的技术要求》要求对优化后的设备进行绝缘耐压验证试验,优化后的产品工频耐压水平提高到51 kV,完全满足海拔2 000 m的运行要求,充分证明这种优化方案能有效解决该高原型12 kV真空断路器工频耐压试验时高压嵌件周围空气域易于被击穿的问题,并且这种优化方案对原产品模具的结构改动最小、改造工作量最少,改造成本最低,对同类应用于高原地区的中压开关设备的绝缘设计具有重要参考价值。
In the power frequency withstand voltage test of a 12 kV vacuum circuit breaker for plateau, the airspace of coupling bolt is susceptible to breakdown. In this study, a simulation model was established by the 3-dimensional modeling software SolidWorks, and the electrostatic field was simulated by Ansys Workbench to obtain the distribution diagram of the equipotential lines of the circuit breaker and the distribution of the electric field. The concentration location of the electric field and the reason why the breakdown occurred in the voltage withstand test of the product were found by analyzing the distribution diagram of the equipotential lines and the distribution of the electric field--the unreasonable designs of the insulation rod and the pole umbrella skirts resulted in distribution distortion of high and low potentials. A method for optimizing the insulation rod and the umbrella skirts was proposed to increase the air clearance on the premise of guaranteeing safe operation of the equipment and minimum cost. Finite element simulation of the optimized model was conducted with the software ansys, and the result indicates that the maximum field strength in the air domain decreases by 14.8%, from 3.3 1×106 mV/mm to 2.82×106 mV/mm. According to the national standard GB/T 20635-2006 special environment condition-technical requirements of high-voltage apparatuses for plateau, insulation withstand voltage test of the optimized equipment was conducted, and the result show that the power frequency withstand voltage level gets up to 51 kV, completely meeting the operation requirements for the altitude of 2 000 m. It is proved that the proposed optimization solution can effectively solve the above breakdown problem of the 12 kV vacuum circuit breaker. And this solution needs minimal change of the original structure, least reconstruction, and lowest cost. This study may offer a reference for optimization design of insulation structure of medium voltage switchgear for plateau.
作者
韩筛根
王涛
魏东新
HAN Shaigen;WANG Tao;WEI Dongxin(Beijing Key Laboratory of Distribution Transformer Energy-saving Technology（China Electric Power Research Institute）,Beijing 100192,China;Weifang Electric Power Company,State Grid Shandong Electric Power Company,Shandong Weifang 261021,China;Wisest Power,Beijing 100142,China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第9期52-57,66,共7页
High Voltage Apparatus
基金
国网公司总部科技项目资助项目~~
关键词
耐压故障
真空断路器
ANSYS
电场优化
绝缘拉杆
voltage fault
vacuum circuit breaker
Ansys
electric field optimization
insulating rod
