摘要
特高压电抗器套管是实现电力电抗器与电站架空线间电气连接的重要设备,高海拔应用环境为电抗器套管电气结构设计提出了更高要求,文中主要针对其内外绝缘结构设计进行讨论。研究内容主要分为3部分:(1)讨论了电抗器套管外瓷套干弧距离计算,并从套管尾部、套管均压罩、套管内绝缘3方面进行了设计和分析;(2)建立了电抗器套管三维电场仿真计算模型;(3)在实际运行环境下对其绝缘性能进行计算分析。研究结果表明:高海拔条件下应对电抗器套管外部金具及外瓷套闪络电压进行海拔修正,计算表明金具、闪络电压修正系数分别为2.07、1.36,且套管端部应装配双环型均压罩;套管外部瓷套的绝缘距离设计为8 500 mm,且尾部绝缘距离设计为1 955 mm;有限元校核计算表明,顶部均压环表面最大场强为1.251 kV·mm^(-1),尾部均压环表面最大场强为16.962 kV·mm^(-1);套管芯子靠近中心导杆侧轴向场强略高于法兰侧,场强最大值为0.550 kV·mm^(-1)。计算结果可为特高压输电工程用电抗器套管绝缘结构设计提供一定的理论依据。
The ultra high voltage reactor bushing is an important equipment to realize the electrical connection between the reactor and the valve tower. High altitude application environment puts forward higher requirement for electrical structure design of reactor bushing. The paper mainly discusses the design of the internal and external insulation structure. The research content are divided into three parts,the calculation of dry arc distance of the bushing porcelain is discussed. The design and analysis of the tail of the bushing,the corona ring and the inner insulation of the bushing has been done. The three dimensional electric field simulation models have been set up to calculate and analyze the insulation performance of the bushing. The results show that the elevation correction of the external ring and the flashover voltage of the porcelain under high altitude should be done,and the calculation shows that the correction coefficient are 2.07 and 1.36 respectively,and the end of the bushing should install with double type ring.The insulation distance of the hollow porcelain insulator is designed as 8 500 mm. The insulation distance of the bushing tail is designed as 1 955 mm. The maximum field strength of the corona ring is 1.251 kV·mm^（-1）,and the maximum field strength on the surface of tail corona ring is 16.962 kV·mm^（-1）. The axial field strength of the bushing core near center conductor is higher than the flange side,and the maximum field strength is 0.55 kV·mm^（-1）. The results of the paper can provide the theoretical basis for the design of the insulation of the reactor transformer bushing used in the UHV transmission project.
作者
张施令
彭宗仁
ZHANG Shiling;PENG Zongren(State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute,Chongqing 401123,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi＇an Jiaotong University,Xi＇an 710049,China)
出处
《高压电器》
CAS
CSCD
北大核心
2018年第8期199-206,共8页
High Voltage Apparatus
基金
重庆市基础科学与前沿技术研究(cstc2017jcyi AX0461)~~
关键词
特高压电抗器套管
外绝缘
电场仿真
结构设计
UHV reactor bushing
external insulation
electric field simulation
structure design
