基于磁路耦合的Sen变压器差动保护方案  

Sen Transformer Differential Protection Scheme Based on Magnetic Circuit Coupling

作　　者：郑涛 于佳旭 眭程曦 申由 薛玉石 武剑 ZHENG Tao;YU Jiaxu;SUI Chengxi;SHEN You;XUE Yushi;WU Jian(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Beijing 102206,China;State Grid Shijiazhuang Electric Power Supply Company,Shijiazhuang 050000,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京102206 [2]国网石家庄供电公司,河北石家庄050000

出　　处：《中国电力》2025年第3期108-118,共11页Electric Power

基　　金：国家自然科学基金联合基金资助项目(U2166205);国网河北省电力有限公司科技项目(kj2022-074)。

摘　　要：Sen变压器作为一种潮流调控装置,通过档位调节改变其接入线路两端的电压、电流的幅值与相位以实现潮流调控作用。然而由于其复杂紧凑的接线形式与内部结构,Sen变压器相较于普通电力变压器而言,故障特征更为复杂,为其本体保护配置带来了困难。为解决这一问题,在分析其拓扑结构的基础上,基于基尔霍夫电流定律、电磁感应定律等物理原理,建立了Sen变压器的差动保护方案。该方案于Sen变压器的输入端、输出端以及励磁单元绕组的末端安装电流互感器TA,通过对Sen变压器配置电平衡差动保护与磁平衡差动保护,可反映Sen变压器各绕组的匝间故障与匝地故障,以及绕组之间引线的短路故障,有效解决Sen变压器本体保护配置困难的问题。利用PSCAD/EMTDC仿真平台验证了所提方案的正确性,为后续Sen变压器的深入研究和工程应用提供理论支撑。As a power flow control device,Sen transformer changes the amplitude and phase of voltage and current at both ends of the access line through gear adjustment to achieve power flow regulation.However,due to its complex and compact wiring form and internal structure,Sen transformers have more complex fault characteristics than ordinary power transformers,which brings difficulties to their ontology protection configuration.In order to solve this problem,this paper analyzes the topology of Sen transformer and establishes a differential protection scheme based on physical principles such as Kirchhoff's current law and electromagnetic induction law.The scheme installs TA at the input end,output end of Sen transformer and the end section of the winding of the excitation unit,and by configuring the Sen transformer with balance differential protection and magnetic balance differential protection,it can reflect the turn-to-turn fault and turn-to-turn fault of each winding of Sen transformer,as well as the short circuit fault of the leads between the windings,which effectively solves the problem of difficult protection configuration for Sen transformer body.Finally,the PSCAD/EMTDC simulation platform is used to verify the feasibility of the proposed scheme,which provides a theoretical support for the subsequent in-depth research and engineering application of Sen transformer.

关 键 词：Sen变压器 磁平衡差动保护 电平衡差动保护 

分 类 号：TM4[电气工程—电器]