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油路隔离型变压器用套管的设计与验证研究
Study on the Designing of Transformer Bushing with Oil-separated Structure and Its Verifying
- 高压电器 2025年 页码：1-8
- 作者机构：
1.武汉理工大学自动化学院，武汉 430070
2.中国电力科学研究院有限公司，武汉 430074
- 作者简介：
罗宇（1998—），男，硕士研究生，主要从事高电压电磁仿真方面的研究（E-mail：1317793848@qq.com）。
吴细秀（1975—），女，副教授，主要从事高电压绝缘技术及高电压电磁仿真方面的研究（E-mail：wuxixiu@whut.edu.cn）。
- 基金信息：
DOI：
中图分类号：-
纸质出版日期：
- 稿件说明：
移动端阅览
罗宇, 王翰, 吴细秀, 等. 油路隔离型变压器用套管的设计与验证研究[J/OL]. 高压电器, 2025,1-8.
LUO Yu, WANG Han, WU Xixiu, et al. Study on the Designing of Transformer Bushing with Oil-separated Structure and Its Verifying[J/OL]. High voltage apparatus, 2025, 1-8.
摘要
针对变压器套管故障后检修周期长、成本高问题，提出一种油路隔离型插拔式套管设计，该套管通过底座结构将套管油中部分和变压器油箱分开，使底座内腔与变压器油箱内腔形成两个独立的空腔，从而使变压器套管实现可插拔，大大简化了检修过程。电容心子的绝缘水平是套管重要性能指标，为此论文专门讨论了如何进行插拔式套管胶浸纸电容心子的改进设计，并制造了样机。为验证底座结构和电容心子设计的正确性，文中开展了仿真和试验验证研究。其中，仿真验证是建立套管整体的三维电—磁—热耦合模型分析工频条件下的温升和电场分布情况，重点讨论了焦耳热、涡损和介损对温升影响。仿真结果表明：配合升高座改进设计的电容心子最大场强约为2.29 kV/mm，具有足够的安全裕度和良好的改善电场分布能力；工频条件下套管最高温度出现在底座插拔头附近，为97.215 ℃，符合套管设计要求。分别开展了工频耐压试验和温升试验，工频耐压试验结果表明设计的样机绝缘水平足够，温升试验结果表明与仿真结果误差小。仿真与试验均表明设计具有较好的绝缘性能和载流能力。
Abstract
For the problem of long maintenance cycle and high cost after transformer bushing failure
an oil separated plug-in bushing design is proposed
which separates the bushing oil-in part from the transformer tank through the base structure
so that the inner cavity of the base and the inner cavity of the transformer tank form two independent cavities
thus making the transformer bushing pluggable and greatly simplifying the maintenance process. The insulation level of the capacitor core is an important performance indicator of the bushing. For this reason
the paper specifically discusses how to carry out the improved design of the pluggable bushing rubber-impregnated paper capacitor core
and manufactures a prototype. To verify the correctness of the base structure and capacitor core design
simulation and experimental validation studies were carried out. Among them
the simulation verification is to establish a three-dimensional electric-magnetic-thermal coupling model of the entire bushing to analyze the temperature rise and electric field distribution under the working frequency conditions
focusing on the effects of Joule heat
eddy loss and dielectric loss on the temperature rise. Simulation results show that: the maximum field strength of the capacitor core is about 2.29 kV/mm
which has enough safety margin and good ability to improve the electric field distribution; the highest temperature of the bushing under the working frequency condition appears near the plugging head of the base
which is 97.215 ℃
which meets the bushing design requirements. The test results show that the insulation level of the prototype design is enough
and the temperature rise test results show that the error is small compared with the simulation results. Both simulation and test show that the design has good insulation performance and current carrying capacity.
关键词
Keywords
references
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