VV接线变压器差动保护方案研究.pdfVIP

第 39 卷 第 10 期 电力系统保护与控制 Vol.39 No.10 2011 年5 月16 日 Power System Protection and Control May 16, 2011 V/V接线变压器差动保护方案研究 刘 巍 （中铁第一勘察设计院集团有限公司，陕西 西安 710043） 摘要：针对某变电所现场改造的需要，提出了一种基于V/V接线牵引变压器的差动保护方案。为了提高牵引变压器容量利用 率，电气化铁道改造过程中常采用 V/V 接线变压器。但由于早期型号微机保护装置设计的不完善，原有的保护方案无法为 V/V接线变压器提供充分的保护。分析了原有保护方案可能存在的拒动情况，并在满足原有微机保护接口要求的前提下提出 了一种V/V接线变压器差动保护接线方式。仿真结果验证了该保护方案的正确性。 关键词: V/V接线变压器；差动保护；保护接线；仿真 Study on differential protection scheme for V/V connection transformer LIU Wei （China Railway First Survey and Design Institute Group LTD，Xi’an 710043, China ） Abstract: For the requirement of traction substation upgrading reformation, a new differential protection scheme for V/V connection traction transformer is introduced. In order to improve the utilization ratio of transformer, V/V connection transformer is often used in traction substation upgrading reformation. Because of the limitation of early phase microprocessor-based relay, the existing protection scheme cannot satisfy the reliability of differential protection for V/V connection transformer. The misoperation condition of existing protection scheme is discussed, and then a new differential protection scheme for V/V connection transformer is introduced to meet the needs of the existing microprocessor-based relay. The simulation results prove the correctness of the introduced scheme in this paper. Key words: V/V connection transformer; differential protection; wire connection of protective relay; simulation 中图分类号： TM77 文献标识码：A 文章编号： 1674-3415(2011)10-0130-05 0 引言 1 变压器差动保护原理 电流差动保护不但能够正确区分内外部故障，