高压电器2025，Vol.61Issue(6)：138-148,11.DOI:10.13296/j.1001-1609.hva.2025.06.016
油路隔离型变压器用套管的设计与验证研究
Study on Design and Verification of Bushing for Oil-circuit-isolation Type Transformer
罗宇 1王翰 1吴细秀 1冯宇 2杜砚 2孟培培1
作者信息
- 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
- 折叠
摘要
Abstract
In view of such issues as long maintenance cycle and high cost after the fault of bushing for transformer,a type of oil circuit isolation plug-in design for the bushing is proposed,which separates partially the oil of the bushing from the oil tank of transformer through the base structure,so that the inner cavities of the base and of the oil tank of transformer 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 bush-ing.For this reason,how to perform the improved design of the rubber-impregnated paper capacitor core of the plugga-ble bushing is specifically discussed in this paper and the prototype has been manufactured.For verifying the design correctness of the base structure and capacitor core,simulation and test verification are developed in this paper,in which,the simulation verification is to set up a integrated three-dimensional electric-magnetic-thermal coupling mod-el of the bushing to analyze the temperature rise and electric field distribution under the power frequency conditions,focusing on the effects of Joule heat,eddy current loss and dielectric loss on the temperature rise.The simulation re-sults show that the maximum field strength of the capacitor core of which the design is improved in coordination of the rising base is about 2.29 kV/mm and the capacitor core has sufficient safety margin and good ability to improve the electric field distribution.The highest temperature of the bushing under the power frequency condition appears near the plugging head of the base,which is 97.215℃and meets design requirement of the bushing.The power frequency withstanding voltage test and temperature rise test are performed respectively,the result of the former shows that the designed prototype has sufficient insulation and of the latter show that its difference from the simulation is very small.Both simulation and test show that the design has better insulation and current-carrying ability.关键词
变压器套管/插拔式结构/电容心子/电—磁—热耦合/型式试验Key words
bushing for transformer/plug-in structure/capacitor cores/electric-magnetic-thermal coupling/type test引用本文复制引用
罗宇,王翰,吴细秀,冯宇,杜砚,孟培培..油路隔离型变压器用套管的设计与验证研究[J].高压电器,2025,61(6):138-148,11.
