Effect of Electric Field Distribution on Branching Characteristics of Streamers in Transformer Oil

IF 1 4区工程技术 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEJ Transactions on Electrical and Electronic Engineering Pub Date : 2026-04-06 Epub Date: 2025-09-30 DOI:10.1002/tee.70172

Tao Zhu, Yangze Lu, Wei Shan, Li Chen, Yu Shen, Bo Jiang, Rui Liu

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引用次数: 0

Abstract

Electrical insulation and discharge phenomena under high electric fields pose critical limitations on the overall performance and reliability of oil-immersed transformers. Under high electric fields, transformer oil is prone to streamer discharge, and the changes in electric field distribution caused by streamer branching directly influence the streamer development process and breakdown voltage of the oil. However, due to limitations in observation equipment and recording systems, the electric field distribution changes induced by streamer branching during discharge are challenging to measure directly. To address this, a two-dimensional needle-plate discharge model in transformer oil was established. Based on experimentally obtained streamer discharge images, a discharge fractal model was constructed frame by frame, and the fractal dimension was calculated using the box-counting method to validate the model's accuracy. Subsequently, the influence of electric field distribution on streamer branching development was analyzed through electrostatic field simulations, and a probability function describing the relationship between electric field strength and branching development was obtained via statistical analysis. This study is significant for improving traditional simulation models, providing a more reasonable simulation of discharge fractal phenomena under actual conditions, and contributing to a deeper understanding of transformer oil discharge mechanisms. © 2025 Institute of Electrical Engineers of Japan and Wiley Periodicals LLC.

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电场分布对变压器油中拖缆分支特性的影响

高电场条件下的电气绝缘和放电现象是制约油浸变压器整体性能和可靠性的重要因素。在高电场作用下，变压器油容易发生流线型放电，流线型分支引起的电场分布变化直接影响到油的流线型发展过程和击穿电压。然而，由于观测设备和记录系统的限制，在放电过程中流线分支引起的电场分布变化难以直接测量。针对这一问题，建立了变压器油中二维针板放电模型。基于实验获得的流光放电图像，逐帧构建了放电分形模型，并采用盒计数法计算了分形维数，验证了模型的准确性。随后，通过静电场模拟分析电场分布对拖缆分支发展的影响，并通过统计分析得到描述电场强度与分支发展关系的概率函数。本研究对于改进传统的仿真模型，更合理地模拟实际工况下的放电分形现象，有助于更深入地认识变压器油放电机理具有重要意义。©2025日本电气工程师协会和Wiley期刊有限责任公司。

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来源期刊

IEEJ Transactions on Electrical and Electronic Engineering 工程技术-工程：电子与电气

CiteScore

2.70

自引率

10.00%

发文量

199

审稿时长

4.3 months

期刊介绍： IEEJ Transactions on Electrical and Electronic Engineering (hereinafter called TEEE ) publishes 6 times per year as an official journal of the Institute of Electrical Engineers of Japan (hereinafter "IEEJ"). This peer-reviewed journal contains original research papers and review articles on the most important and latest technological advances in core areas of Electrical and Electronic Engineering and in related disciplines. The journal also publishes short communications reporting on the results of the latest research activities TEEE ) aims to provide a new forum for IEEJ members in Japan as well as fellow researchers in Electrical and Electronic Engineering from around the world to exchange ideas and research findings.