摘要
高压直流输电线路合成电场是直流输电工程重要的环境指标,其计算涉及复杂的直流电晕放电过程,往往采用Deutsch假设或Kaptzov假设进行简化,但目前对这两种假设的合理性具体分析不足。对此,分析了应用Deutsch假设需满足的物理条件,实际运用中该假设条件难以满足,计算结果存在一定误差;采用迎风有限元计算模型,针对我国典型±500、±800kV的线路参数进行计算,发现可忽略导线电晕电流变化对导线表面电场强度的影响,满足Kaptzov假设,并与我国±800kV线路地面合成电场的实测结果进行对比,验证了Kaptzov假设比Deutsch假设计算结果更合理。
The total electric field of HVDC transmission line is an important environmental index of HVDC transmission project.The calculation of total electric field involves a complex DC corona discharge process,which is often simplified by Deutsch hypothesis or Kaptzov hypothesis.At present,the concrete analysis of the rationality of these two hypotheses is insufficient.In this paper,the physical conditions for the application of Deutsch hypothesis were analyzed,and in practical application,the hypothesis is difficult to meet,and there are some errors in the calculation results.According to the typical parameters of±500 kV and±800 kV lines in China,the change of potential gradient on the conductor surface caused by the change of corona current can be ignored by using the upstream finite element calculation model,which proves the rationality of kaptzov hypothesis.Compared with the measured results of±800 kV transmission lines in China,it is verified that kaptzov hypothesis is more reasonable than Deutsch hypothesis.
作者
谢辉春
宋敏
卢梦瑶
徐吉来
赵学成
XIE Hui-chun;SONG Min;LU Meng yao;XU Ji-lai;ZHAO Xue-cheng(China Electric Power Research Institute,Wuhan 430074,China;Yichang Operation and Maintenance Branch,State Grid Hubei Maintenance Company,Yichang 443000,China;College of Electrical Engineering New Energy,China Three Gorges University,Yichang 443002,China)
出处
《水电能源科学》
北大核心
2021年第7期184-187,196,共5页
Water Resources and Power
基金
国家电网公司科技项目(GYW11201907738)。
