摘要
对1 100 kV高压组合开关电器(GIS)用SF_6气体绝缘复合套管内部SF_6气体压强的确定、GIS复合套管内屏蔽结构许用场强进行了讨论分析,确定了套管内部金属屏蔽和外绝缘结构设计方案。基于此,建立了1 100 kV GIS套管的三维有限元仿真计算模型,并对其内部金属屏蔽和绝缘件电场分布进行了仿真模拟,同时对套管基座进行了机械应力分布计算。结果表明:套管金属屏蔽最大电场强度约为10 k V/mm,复合绝缘子护套表面电位分布接近线性分布;当负荷加载方向垂直于GIS管道方向时,弯曲应力最大值为11.2 MPa;在1.1倍额定电流6 930 A下,套管中温度最高点位于中心导杆附近,最高温度为80℃,满足设计要求,试制的SF_6气体绝缘复合套管通过了全部型式试验。
The determination of gas pressure in SF6 gas insulated composite bushing for 1 100 kV GIS and the allowable field strength of internal shielding structure in composite bushing were discussed,and the design scheme of internal metal shielding and external insulation structure of bushing was determined.Based on this,a three-dimensional finite element simulation model of 1 100 kV GIS bushing was established.The electric field distribution of internal metal shielding and insulation parts was simulated,and the mechanical stress distribution of bushing base was calculated.The results show that the maximum electric field intensity of metal shielding is about 10 kV/mm,and the potential of composite insulator sheath surface is almost linear distribution.When the loading direction is vertical to the direction of GIS,the maximum bending stress is 11.2 MPa.Under the 1.1 times of rated current 6 030 A,the highest temperature of the bushing is 80℃,which appears near the center bar.The test results meet the design requirements,and the trial-produced SF6 gas insulated composite bushing passes all type tests.
作者
张施令
何永胜
李乃一
彭宗仁
ZHANG Shiling;HE Yongsheng;LI Naiyi;PENG Zongren(Electric Power Research Institute of State Grid Chongqing Electric Power Company,Chongqing 401123,China;State Grid Chongqing Electric Power Company,Chongqing 400014,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《绝缘材料》
CAS
北大核心
2019年第4期50-56,共7页
Insulating Materials
基金
重庆市基础科学与前研技术研究(cstc2018jcyjAX0486)
关键词
SF6气体绝缘复合套管
三维有限元
电场分布
应力分布
SF6 gas insulated composite bushing
three-dimensional finite element method
electric field distribution
stress distribution
