摘要
依托向家坝至南汇直流输电工程,研究了±800kV换流站交流侧工频过电压、交直流侧操作过电压和雷电过电压、直流线路操作和雷电过电压。重点分析了±800kV与±500kV在直流过电压和绝缘配合方面不同之处。给出了避雷器配置方式、参数的选择原则和方法,确定了换流站各避雷器的保护水平和配合电流及避雷器的能耗及能耗与直流侧的快速保护定值、延迟时间的配合。提出换流站绝缘配合裕度系数和主要设备绝缘水平要求及直流线路操作冲击和雷电冲击要求的最小空气间隙计算方法。
This paper presents the simulation research calculation results on power frequency overvoltage at AC side, switching and lightning overvoltage at both AC and DC side as well as switching and lightning overvoltage of DC transmission line and ±800kV HVDC converter station. The simulation calculation is based on Xiangjiaba-Nanhui HVDC transmission project. The difference of DC overvoltage and insulation coordination between ±800kV and ±500kV HVDC transmission system is analyzed. The arrangement scheme of arresters, selection methods and principle of parameters for ±800kV HVDC converter station are presented. The protection level, coordinating current and energy consumption of arresters as well as the setting value of the protection level at DC side and the coordination of delay time are given by calculation. This paper put forward insulation coordination margin coefficient, requirement on insulation level of main apparatus and the minimum air clearance required by switching and lightning overvoltage of ±800kV HVDC transmission line The optimization of overvoltage protection of DC system and determination of reasonable insulation level for converter station are the basis of design, manufacture and test of equipment at converter station. It is to ensure that the equipment at converter station will not be oversize and the manufacture cost and difficulty will not be too high due to selection of a too high insulation level. Besides, the failure rate, loss of blackout and maintenance cost will also not increase due to selection of a too low insulation level.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2006年第12期125-132,共8页
High Voltage Engineering
关键词
±800
KV
换流站
避雷器
操作过电压
雷电过电压
绝缘配合
±800 kV
converter station
arrester
switching overvoltage
lightning overvoltage
insulation coordination
