基于磁路特征三相三柱式变压器励磁参数识别_索南加乐.pdfVIP

第 31 卷 第 19 期 中 国 电 机 工 程 学 报 Vol.31 No.19 Jul.5, 2011 2011 年 7 月 5 日 Proceedings of the CSEE ©2011 Chin.Soc.for Elec.Eng. 97 0258-8013 (2011) 19-0097-08 TM 77 A 470 40 文章编号： 中图分类号： 文献标志码： 学科分类号： ⋅ 基于磁路特征的三相三柱式变压器励磁参数识别 索南加乐，许立强，焦在滨，杜斌 (西安交通大学电气工程学院，陕西省 西安市 710049) Identification Method for Excitation Inductances of Three-phase Three-limb Transformer Based on Characteristics of Magnetic Circuit SUONAN Jiale, XU Liqiang, JIAO Zaibin, DU Bin (School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, China) ABSTRACT: For the application of excitation parameters in 侧环流不是三相三柱式变压器的励磁电流，在用绕组端电压 transformer protection, the inductance identification method of 代替主磁通感应压降后，可直接应用于 Y/Δ接线变压器，励 three-phase three-limb transformer was proposed. Based on the 磁涌流时仍可准确计算其励磁参数，其特征明确，可与差动 characteristic of magnetic circuit, a mathematic model which 保护配合，构建励磁涌流识别判据。通过统一电磁等效电路 links the voltages induced by the main fluxes and the currents (unified magnetic equivalent circuit，UMEC)仿真模型验证了该 of the windings was established. For transformers with Y/Y 方法的正确性。 connection, using main flux induced voltage, the excitation 关键词：三相三柱变压器；磁等值回路；励磁电感；励磁涌流 inductances can be calculated accurately and steadily under conditions of normal operation, inrush current and external 0 引言 faults, and the characteristics are distinct from internal faults. 变压器保护存在的主要问题是如何准确地区分 The delta side circulating current is no part of excitation