摘要
特高压直流换流站占地面积较大,站内存在较大的地电位差,交直流设备的相互影响使得换流站接地网设计存在许多特殊之处。为此,针对常规的设计方法在高土壤电阻率地区接地电阻很难满足规程要求的问题,根据设备安全与人身安全的要求,分析了接地网设计的约束条件,提高了地电位升上限。并结合哈密-郑州直流特高压输电工程郑州换流站的具体条件,对接地网系统的短路电流分流系数进行了详细分析,提出了基于不等间距设计的复合接地网优化布置方案,并通过地网安全分析评估软件,进行了安全性校验,具有重要的工程参考价值。
UHV DC converter station covers a large area, and potential difference in the station is great. Moreover, AC/DC interaction makes grounding grid design of the converter station have specialness. In view of the problem that the conventional design methods are difficult to meet the requirement of specification in high soil resistivity area grounding resistance, and according to equipment safety and personal safety requirement, this paper analyzes the grounding grid design constraint condition and improves the ground potential rise limit. In addition, this paper com- bines with the specific conditions of Zhengzhou converter in the Hami-Zhengzhou UHV DC transmission project, car- ries out a detailed analysis of the grounding grid systenl short-circuit current shunt coefficient, and proposes a layout optimization scheme based on unequal spacing of the composite ground network. Through the ground network security analysis and evaluation software, security checks are carried out and the design is verified to have important engineer- ing reference value.
出处
《电力系统及其自动化学报》
CSCD
北大核心
2014年第12期85-90,共6页
Proceedings of the CSU-EPSA
关键词
直流输电
接地电阻
接地网设计
安全校核
DC power transmission
grounding resistance
ground grid design
security checking
