特高压有载调压变压器差动保护特性分析  

Analysis of Differential Protection Characteristic for On-Load-Tap-Changer Transformer of UHV

作　　者：李岩军[1] 周春霞[1] 肖远清[2] 郭晓[3] 

机构地区：[1]中国电力科学研究院,北京100192 [2]北京四方继保自动化股份有限公司,北京100085 [3]国电南京自动化股份有限公司,江苏南京210003

出　　处：《中国电力》2014年第9期112-117,148,共7页Electric Power

摘　　要：为研究特高压有载调压变压器差动保护特性,从变压器差动保护基本特性、差流不平衡特性等方面进行了研究,指出常规调压变压器保护在特高压变压器有载调压过程中的动作风险。通过对差流不平衡特性影响因素深入分析,给出调压变压器差动保护额定电流选取建议。通过仿真试验得到了不同档位下差流分布情况,提出了有载调压过程中调压变压器差动保护整定策略,并通过仿真试验得到验证。In order to investigate the differential protection characteristics for on-load-tap-changer transformers of UHV,the basic performances of differential transformer protection and its unbalanced differential current were studied,by which it is found that the conventional protection of on-load-tap-changer transformers may have a potential risk during the transformer tap adjustment.Through the further analysis of the influencing factors on the characteristics of unbalanced differential current,suggestions about the selection of ratedcurrent of differential protection for on-load-tap-changer transformers were proposed.In addition,the differential current distribution during the transformer tap adjustment is obtained by the simulation and the setting strategy is accordingly provided,which is also validated by the simulation.

关 键 词：调压变压器 差动保护 额定电流 整定策略 特高压 仿真试验 档位 差流 

分 类 号：TM773[电气工程—电力系统及自动化]