基于等效短路试验的变压器绕组线累积效应  

Cumulative Effect of Winding Wires in Transformer Based on Equivalent Short-circuit Test

作　　者：李鹏 隋华泽 徐征宇 李林达 汪可 汪佐宪 张书琦 赵志刚 LI Peng;SUI Huaze;XU Zhengyu;LI Linda;WANG Ke;WANG Zuoxian;ZHANG Shuqi;ZHAO Zhigang(China Electric Power Research Institute,Haidian District,Beijing 100192,China;SIEMENS Energy Transformer(Guangzhou)Co.,Ltd.,Guangzhou 510530,Guangdong Province,China)

机构地区：[1]中国电力科学研究院有限公司,北京市海淀区100192 [2]广州西门子能源变压器有限公司,广东省广州市510530

出　　处：《中国电机工程学报》2025年第6期2411-2422,I0032,共13页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

基　　金：国家自然科学基金联合基金项目(U2166213)。

摘　　要：绕组线是电力变压器线圈轴向支撑结构的关键材料之一,多次短路冲击下变压器绕组线的累积效应尚不清晰。该文提出适用于变压器绕组线的多次短路冲击等效试验方法,搭建模拟短路力的动态冲击试验平台,与传统静态试验方法相比更符合实际故障情况。试验获得绕组线在多种不同短路工况下的累积形变规律,结果表明:累积形变随短路次数增加呈增长饱和趋势;短路间隔类型对绕组线累积效应特性具有影响;以一台500kV变压器为实例计算,多次短路后各线圈阻抗最大变化为1.21%,有潜在失稳风险。研究结果揭示了绕组线的多次短路累积效应特性,为进一步研究多次短路累积效应对变压器抗短路能力的影响和短路动态计算提供了技术支撑。Winding wires are crucial components of structural supports along the axial direction of the coils in power transformers.However,the cumulative effects of multiple short-circuit impacts on transformer winding wires remain unclear.This paper proposes a multiple short-circuit impact equivalent test method applicable to winding wires.A dynamic impact test platform is constructed to overcome the limitations of static loads in material tests.The experiment reveals the patterns of cumulative deformations of winding wires.The results indicate that the cumulative deformation increases and saturates with the increasing number of short-circuits.The type of short-circuit interval influences short-circuit cumulative properties of winding wires.A calculation method for transformer coil impedance changes based on deformations of winding wires is proposed.Example calculations demonstrate that the impedance of each coil changes after multiple short-circuits,with a maximum impedance change of 1.21%,leading to a potential risk of fault.The research elucidates the cumulative effect properties of multiple short-circuits on winding wires,providing technical support for further studying the influence of multiple short-circuit cumulative effects on transformer short-circuit withstand capability and dynamic response calculations of transformer coils.

关 键 词：多次短路 绕组线 累积形变 抗短路能力 累积效应特性 

分 类 号：TM407[电气工程—电器]