Mechanical Properties Of Epoxy-Bonded Continuously Transposed Conductors(CTCs) at High Temperature and its Influence on Mechanical Strength of Windings

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Pub Date : 2022-10-30 DOI:10.1109/CEIDP55452.2022.9985276

Xiaoyu Zhu, J. Zhan, Lingfeng Jin, Zhi Yang, Suning Liang, Fan Zhang, S. Ji

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Abstract

Epoxy-bonded continuously transposed conductors (CTCs) can enhance windings’ short circuit strength due to the bunch of conductors are bonded by epoxy coating. However, the coating’s bonding strength decrease with the increasing temperature and consequently reduce the mechanical strength of CTCs. This paper analyzes the change of CTCs mechanical strength with temperature. The tensile test explored the elastic modulus and yield strength of copper conductor. The adhesive strength of self-adhesive paint was investigated by adhesive test. The bending strength of CTCs was investigated by three-point bending test. We calculated the elastic modulus of self-adhesive paint by finite element model. Based on the existing winding critical load calculation equations, we calculate the elastic modulus and moment of inertia of CTCs at different temperatures. And we calculate the winding critical load equation with the influence of temperature. The research content has certain significance for improving the short-circuit withstand capacity of transformer.

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环氧键合连续转置导体(ctc)高温力学性能及其对绕组机械强度的影响

环氧树脂连续转置导体(ctc)是一种由环氧涂层粘合而成的连续转置导体，可以提高绕组的短路强度。涂层的结合强度随着温度的升高而降低，从而降低了ctc的机械强度。本文分析了CTCs机械强度随温度的变化规律。拉伸试验探讨了铜导体的弹性模量和屈服强度。通过粘接试验研究了自粘涂料的粘接强度。采用三点弯曲试验研究了ctc的抗弯强度。采用有限元模型计算了自粘涂料的弹性模量。基于现有的绕组临界载荷计算方程，计算了不同温度下ctc的弹性模量和转动惯量。并计算了考虑温度影响的绕组临界负载方程。研究内容对提高变压器抗短路能力具有一定的意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

2022 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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