750kV金属氧化物避雷器电位分布研究  

Study on the potential distribution of 750 kV metal oxide surge arrester

作　　者：郭洁[1] 何计谋[2] 李晓峰 

机构地区：[1]西安交通大学电气学院,陕西西安710049 [2]西安电瓷研究所,陕西西安710077 [3]辽河石油勘测局供电公司,辽宁盘锦124010

出　　处：《中国电力》2006年第1期15-17,共3页Electric Power

摘　　要：超高压无间隙金属氧化物避雷器(MOA)是超高压绝缘配合的基础,避雷器的保护特性决定着设备制造技术难度和工程造价。在提高MOA保护特性的同时必须保证其自身工作可靠性。超高压MOA的电位分布严重影响着电阻片的工作荷电率,局部荷电率过高会引起MOA加速老化和热崩溃。改善MOA电位分布,降低局部荷电率是提高超高压MOA运行可靠性的重要环节。采用ANSYS5.7分析软件对750 kV系统用MOA进行了电位分布仿真计算,利用电流法进行了电位分布实测研究,对几种改善超高压MOA电位分布措施进行了分析。分析表明:超高压MOA电位分布的改善宜采取综合改进措施。The metal oxide surge arrester （MOA） used for EHV power systems is a base of insulation co-ordination. The degree of difficulty to manufacture electric power equipment and whole-project cost are mostly depended on the characteristics of MOA. At the same time of improving the protecting characteristics of MOA, it is necessary to ensure MOA operating reliability. The potential distribution of MOA in EHV power systems seriously affects the electric load rate of ZnO resistors in MOA. During operation, the part of ZnO resistors, which has higher electric load rate, would be accelerated ageing process to thermal breakdown. It is very important to improve the potential distribution of MOA and reduce the electric load late of ZnO resistors in EHV power systems. The simulating calculation of potential distribution for 750 kV MOA was carried out by using software ANSYS5.7, and the practical measurement of potential distribution was implemented by adopting current method. Several measures for improving the potential distribution of MOA in EHV power systems were analyzed. It is suggested that the MOA used for EHV power systems needs to be taken comprehensive measurements to improve the potential distribution.

关 键 词：MOA 电位分布不均匀系数 荷电率 

分 类 号：TM862[电气工程—高电压与绝缘技术]