| 引用本文: | 潘 超,安景革,刘 闯,等.考虑地铁杂散电流干扰的电网变压器振动噪声耦合效应[J].电力系统保护与控制,2025,53(9):70-81.[点击复制] |
| PAN Chao,AN Jingge,LIU Chuang,et al.Power grid transformer vibration-noise coupling effect considering subway stray current interference[J].Power System Protection and Control,2025,53(9):70-81[点击复制] |
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| 摘要: |
| 针对城市地铁杂散电流导致电网变压器出现振动噪声异常的问题，提出一种基于杂散电流变化与本体噪声映射关系的变压器失稳判别方法。首先，分析杂散电流干扰电网的主要途径与原理，根据实测数据总结杂散电流的变化特性。然后，提出考虑杂散电流干扰的变压器多场耦合模型，将电磁-机械-声耦合划分为电磁干扰域与振动-噪声传播域的耦合。仿真分析不同场景下变压器多物理特征信息，总结杂散电流突变率、突变时刻对变压器电流、磁通等参数的干扰、传播影响规律。最后，搭建实验平台，测量变压器的多物理特征参数，与仿真对比，验证所提模型与结论的正确性，并基于杂散电流突变率与噪声的映射关系制定失稳判据。结果表明，在杂散电流突变处，变压器振动噪声异常加剧；当杂散电流突变时刻与工频激励初始相位的相角差为90°时，该问题最严重，本体噪声水平升高约10%。该方法为轨道交通临近电网变压器的态势感知与设备保护提供依据。 |
| 关键词: 杂散电流 突变性 多场耦合 振动噪声 态势感知 |
| DOI：10.19783/j.cnki.pspc.240038 |
| 投稿时间：2024-01-07修订日期：2024-05-29 |
| 基金项目:国家重点研发计划项目资助(2021YFB2400800) |
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| Power grid transformer vibration-noise coupling effect considering subway stray current interference |
| PAN Chao1,AN Jingge1,LIU Chuang1,LI Zaiyuan1,SHI Xiaobo1,DU Yi2 |
| (1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology (Northeast
Electric Power University), Ministry of Education, Jilin 132012, China; 2. Dalian Power Supply Company,
State Grid Dalian Electric Power Co., Ltd., Dalian 116001, China) |
| Abstract: |
| To address the abnormal vibration and noise in power grid transformers caused by stray currents from urban subways, a transformer instability identification method based on the mapping relationship between stray current variations and inherent noise is proposed. First, the primary paths and mechanisms of stray current interference in the power grid are analyzed, and the characteristics of the stray current variations are summarized based on measured data. Next, a multi-physics transformer coupling model considering stray current interference is proposed, dividing the electromagnetic-mechanical-acoustic coupling into an electromagnetic interference domain and a vibration-noise propagation domain. Through simulation analysis under different scenarios, the interference and propagation patterns of stray current mutation rate and timing on transformer parameters such as current and magnetic flux are studied. Finally, an experimental platform is set up to measure the multi-physics characteristics of transformers, while the correctness of the proposed model and conclusions are verified by comparing experimental and simulation results. Moreover, an instability criterion is established based on the mapping between the stray current mutation rate and noise. The results indicate that the vibration and noise of the transformer intensify significantly at points of stray current mutation, with the problem being most severe when the phase angle difference between the stray current mutation timing and the initial phase of power frequency excitation is 90°, leading to an approximately 10% increase in the inherent noise level. This method provides a basis for situational awareness and equipment protection of grid transformers near rail transit systems. |
| Key words: stray current mutation characteristics multi-physics coupling vibration noise situational awareness |
