| 引用本文: | 邓祥力,刘美含,曾 平,等.基于漏磁场相位变化特征的变压器绕组早期故障保护研究[J].电力系统保护与控制,2025,53(24):1-12.[点击复制] |
| DENG Xiangli,LIU Meihan,ZENG Ping,et al.Research on early fault protection of transformer windings based on leakage magnetic field phase change characteristic[J].Power System Protection and Control,2025,53(24):1-12[点击复制] |
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| 摘要: |
| 针对传统变压器保护难以有效识别变压器绕组轻微匝间短路类早期故障的问题，提出一种基于漏磁场相位变化特征的变压器绕组早期故障保护方案。首先，建立非理想绕组结构变压器漏磁场解析模型，计算分析绕组故障前后漏磁分布变化规律。然后，结合漏磁相位突变量、不同测点漏磁相位差等故障分量及漏磁幅值比信息，提出漏磁相位差动保护判据和故障定位逻辑，避免了温度对光纤测量系统的影响。并利用漏磁场解析模型进行保护动作定值整定。最后，通过动模实验与有限元仿真模型验证了所提早期故障判别与定位方案的可行性和有效性。 |
| 关键词: 非理想绕组变压器 漏磁场 相位变化 早期故障保护 |
| DOI：10.19783/j.cnki.pspc.250109 |
| 投稿时间：2025-01-26修订日期：2025-04-25 |
| 基金项目:国家电网有限公司科技项目资助(520940240037)；国家自然科学基金项目资助(51777119) |
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| Research on early fault protection of transformer windings based on leakage magnetic field phase change characteristic |
| DENG Xiangli1,LIU Meihan2,ZENG Ping3,ZHOU Desheng3,DU Zhaoxin3,FENG Qian3 |
| (1. School of Electric Power Engineering, Shanghai University of Electric Power, Shanghai 200090, China;
2. State Grid of China Technology College, Jinan 250002, China; 3. State Grid Shanghai Municipal
Electric Power Company, Shanghai 200437, China) |
| Abstract: |
| To address the difficulty of traditional transformer protection in effectively identifying early-stage faults such as minor inter-turn short circuits in transformer windings, this paper proposes an early fault protection scheme for transformer windings based on the phase change characteristics of the leakage magnetic field. First, an analytical model of the leakage magnetic field for a transformer with a non-ideal winding structure is established, and the variation of magnetic leakage distribution before and after winding failures is analyzed. Then, by combining the fault components such as magnetic leakage phase mutation, phase differences among multiple measuring points, and leakage amplitude ratio, a leakage phase differential protection criterion and a fault location logic are proposed, effectively avoiding the influence of temperature on the optical fiber measurement system. The leakage magnetic field analytical model is also used for setting the operating thresholds of the protection scheme. Finally, the feasibility and effectiveness of the proposed early fault identification and location scheme are verified by dynamic model experiments and finite element simulations. |
| Key words: non-ideal winding transformer leakage magnetic field phase change early fault protection |
