摘要
±400 kV换流变压器阀侧套管的设计裕度均低于特高压等级换流变压器套管,且±400 kV换流变压器阀侧套管在换流阀厅用量较大,因此有必要针对±400 kV换流变压器阀侧套管绝缘结构设计进行具体分析讨论。分析了±400 kV换流变压器阀侧套管双导电管结构的发热机理,从理论解析角度给出了双导电管结构的设计尺寸,进一步优化设计了套管的芯体绝缘结构,从内、外绝缘配合的角度给出了套管的外绝缘设计方案,并对其整体电场分布情况进行了校核计算:工作电压下其径向电场强度控制在3.11 kV/mm,工频耐压下其轴向电场强度控制在0.51 kV/mm,均满足±400 kV换流变压器阀侧套管设计电场强度控制要求。对研制完成的±400 kV换流变压器阀侧套管进行型式实验,结果表明所研制的套管通过了工频干耐受电压试验并局部放电测量、雷电冲击干耐受电压试验和温升试验等典型型式试验。
The design margin of valve side bushing of±400 kV converter transformer is lower than that of UHV converter transformer,and the number of valve side bushing used in±400 kV converter transformer is large in converter valve hall,so it is necessary to analyze and discuss the insulation structure design of valve side bushing of±400 kV converter transformer.The heating mechanism of the double conductive tube structure of the valve side bushing of±400 kV converter transformer is analyzed,the design size of the double conductive tube structure is given from the theoretical analysis point of view,the core insulation structure of the bushing is further optimized,the external insulation design scheme of the bushing is given from the perspective of internal and external insulation coordination,and the overall electric field distribu⁃tion is calculated and checked.The radial electric field intensity is controlled at 3.11 kV/mm under wor-king voltage,and the axial electric field intensity is controlled at 0.51 kV/mm under the power frequency withstand voltage,which meet the requirements of electric field intensity control in the design of valve side bushing of±400 kV converter transformer.Furthermore,the type test of the developed valve side bushing of±400 kV converter transformer is carried out,and the results show that the developed bushing passes the typical type tests such as power frequency dry withstand voltage test with partial discharge measure⁃ment,lightning impulse dry withstand voltage test and temperature rise test.
作者
张施令
彭宗仁
宁鑫
田汇冬
ZHANG Shiling;PENG Zongren;NING Xin;TIAN Huidong(Electric Power Research Institute of State Grid Chongqing Electric Power Company,Chongqing 401123,China;State Key Laboratory of Electrical Insulation and Power Equipment,Xi’an Jiaotong University,Xi’an 710049,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610072,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2021年第6期199-206,共8页
Electric Power Automation Equipment
关键词
±400
kV换流变压器阀侧套管
双导电管结构
优化设计
电场强度控制
±400 kV valve side bushing of converter transformer
double conductive tube structure
optimiza⁃tion design
electric field intensity control
