电力系统保护与控制2025，Vol.53Issue(9)：70-81,12.DOI:10.19783/j.cnki.pspc.240038
考虑地铁杂散电流干扰的电网变压器振动噪声耦合效应
Power grid transformer vibration-noise coupling effect considering subway stray current interference
摘要
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.关键词
杂散电流/突变性/多场耦合/振动噪声/态势感知Key words
stray current/mutation characteristics/multi-physics coupling/vibration noise/situational awareness引用本文复制引用
潘超,安景革,刘闯,李载源,石晓博,杜毅..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):70-81,12.基金项目
国家重点研发计划项目资助(2021YFB2400800)This work is supported by the National Key Research and Development Program of China(No.2021YFB2400800). （2021YFB2400800）
