电力系统保护与控制Issue(22)：1-8,8.
特高压变压器的阻抗快速后备保护
Impedance backup protection for UHV large capacity transformers
摘要
Abstract
The backup protection of UHV large capacity transformers consisted of three single phase transformers is studied. The overreach permissive type and the overreach blocking type impedance pilot protection scheme, used as backup protection of these transformers is proposed. The feasibility and superiority of the proposed scheme are proved. Such impedance protections are less affected by magnetizing inrush currents and the correctness of the conclusion is testified by digital simulations. The simulation model of UHV transformer is established. Simulation results prove that the magnetizing inrush current caused by transformer no-load switching and external fault clearing will not make the impedance protection maloperation, while the fault can be cleared fast at interphase short-circuit of transformer exit. The proposed protection scheme can improve the reliability of protection of large capacity UHV transformers.关键词
变压器保护/阻抗保护/纵联保护/超范围允许式/超范围闭锁式Key words
transformer protection/impedance protection/pilot protection/overreach permissive type protection/overreach blocking type protection分类
信息技术与安全科学引用本文复制引用
贺家李,贺继红,汪国新,薛士敏..特高压变压器的阻抗快速后备保护[J].电力系统保护与控制,2014,(22):1-8,8.基金项目
教育部博士点基金资助项目(20100032120074)；国家自然科学基金青年科学基金(51207103，1207102)This work is supported by Doctoral Fund of Ministry of Education of China (No.20100032120074) and National Natural Science Foundation of China (No.51207103 and No.1207102) （20100032120074）
