运行温度下变压器自粘换位导线力学特性研究  

Study on Mechanical Properties of Transformer Continuously Transposed Cables at Operating Temperatures

作　　者：张磊 李锐 陈梁远 潘绍明 ZHANG Lei;LI Rui;CHEN Liangyuan;PAN Shaoming(Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,China;Guangxi Power Grid Equipment Monitoring and Diagnosis Engineering Technology Research Center,Nanning 530023,China;Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment,Nanning 530023,China)

机构地区：[1]广西电网有限责任公司电力科学研究院,广西南宁530023 [2]广西电网设备监测及诊断工程技术研究中心,广西南宁530023 [3]广西电力装备智能控制与运维重点实验室,广西南宁530023

出　　处：《变压器》2024年第1期51-57,共7页Transformer

摘　　要：自粘换位导线在变压器高温运行时,抗短路能力明显下降。为了深入研究高温对自粘换位导线力学性能影响,本文作者对自粘换位导线分别进行了拉伸、剪切以及三点弯曲试验,并建立了导线的三维有限元模型,仿真了自粘换位导线的等效模量与截面的位移与应力。结果表明,铜导线自身屈服强度与弹性模量不随温度变化,自粘漆力学性能与温度显著相关,当温度升高到120℃时,导线粘结强度与抗弯刚度分别下降了83.3%与83.5%,自粘漆等效弹性模量下降了73.9%,绕组截面位移与最大应力增大了135%与300%。研究表明,高温下自粘换位导线力学性能下降明显,为热态下变压器抗短路能力校核提供了依据。When the transformer operates at high temperature,the anti short circuit ability ofcontinuously transposed cables significantly decreases.In order to deeply study the impact of high temperature on the mechanical properties of continuously transposed cables,tensile,shear,and three-point bending tests were conducted on continuously transposed cables in this paper.A three-dimensional finite element model of the wire was established,and the equivalent modulus,displacement,and stress of the cross-section of the wire were simulated.The results show that the yield strength and modulus of elasticity of copper conductors do not vary with temperature,and the mechanical properties of self adhesive paint are significantly related to temperature.When the temperature rises to 120℃,the bonding strength and flexural stiffness of the conductors decrease by 83.3%and 83.5%,respec-tively,the equivalent modulus of elasticity of self adhesive paint decreases by 73.9%,and the cross-sectional displacement and maximum stress of the windings increase by 135%and 300%.The research shows that the mechanical properties of continuously transposed cables decrease significantly at high temperatures,This pro-vides a basis for checking the short-circuit resistance of transformers under hot conditions.

关 键 词：变压器 自粘换位导线 力学性能 

分 类 号：TM406[电气工程—电器]