电力系统及其自动化学报2017，Vol.29Issue(10)：65-72,8.DOI:10.3969/j.issn.1003-8930.2017.10.012
纵联支接阻抗保护在超(特)高压线路中的应用
Application of Longitudinal Tapped Impedance Protection to EHV/UHV Lines
李建辉 1井嵘 2刘世明 1吴聚昆 1郭韬1
作者信息
- 1. 山东大学电网智能化调度与控制教育部重点实验室,济南 250061
- 2. 国网山东电力公司烟台供电公司,烟台 264000
- 折叠
摘要
Abstract
In order to overcome the problem of the decrease in the sensitivity of longitudinal current differential protec?tion or even protection failure when an internal ground fault with high resistance occurs on heavy load lines,zero-se?quence current differential protection is introduced as a supplement to the current differential protection in the tradition?al protection scheme. However,zero-sequence differential protection does not have phase-selection capability,and it may refuse to operate when a ground fault with high resistance occurs on open-phase operation lines. To solve this prob?lem,it is suggested that longitudinal tapped impedance(LTI)protection can be served as a supplement to the full cur?rent differential protection to constitute a new protection scheme based on its characteristics,which overcomes the prob?lem induced by zero-sequence current differential protection. The new protection scheme can act quickly and it has natu?ral phase selection capability. Moreover,it is not affected by open-phase operation mode,and does not need to compen?sate the capacitive current. When a ground fault with high resistance occurs,the new protection scheme can operate reli?ably and sensitively. Simulation results verify the correctness and validity of the new scheme .关键词
纵联支接阻抗/纵联差动保护/保护方案/过渡电阻/非全相Key words
longitudinal tapped impedance(LTI)/longitudinal differential protection/protection scheme/transition resistance/open-phase分类
信息技术与安全科学引用本文复制引用
李建辉,井嵘,刘世明,吴聚昆,郭韬..纵联支接阻抗保护在超(特)高压线路中的应用[J].电力系统及其自动化学报,2017,29(10):65-72,8.
