高压电器2026，Vol.62Issue(6)：97-104,8.DOI:10.13296/j.1001-1609.hva.2026.06.012
中压电缆早期故障多物理场仿真及时频特征分析
Multi-physical Field Simulation and Time-frequency Characteristic Analysis of Incipient Fault in Medium Voltage Cables
摘要
Abstract
Incipient faults in cables are often accompanied by intermittent arcing,with self-extinuishing of the arc occuring near the current zero-crossinng point,manifesting as self fault clearanc.However,the physical changes du-rig this process are still not well understood.Due to the very short duration of intermittent arc discharge,it is diffi-cult for traditional relay protection equipment to identify incipient faults and appropriate features need to be extract-ed to identify incipient fault signals.In this paper,based on the magneto hydro dynamics theory(MHD),the multi-physical field simulation of medium voltage cables is performed to analyze the variation of current density,magnetic field intensity and temperature distribution during a quarter cycle of intermittent arcing.Short-time Fourier trans-form(STFT)is performed on the simulation waveform so to obtain the frequency domain characteristics of the incipi-ent fault.The results show that in case of incipient fault in cables there is a high frequency component,which is ob-viously different from the normal operation under the 5 kHz frequency treated by Hanning window,and the ampli-tude difference can be up to 85 dB.While,the Hamming window has a weak processing effect,so it is necessary to select or combine appropriate features for identification.关键词
自恢复故障/间歇性电弧/磁流体动力学/时频变换/故障识别Key words
self-fault clearance/intermittent arc/MHD/time-frequency transformation/fault identification引用本文复制引用
赵景涛,王毅松,秦卉,黄墀志,张军,石超群,徐阳..中压电缆早期故障多物理场仿真及时频特征分析[J].高压电器,2026,62(6):97-104,8.基金项目
南瑞集团有限公司科技项目(SGNRGF00XAJS2301698).Project Supported by Science and Technology Project of NARI Group Corporation(SGNRGF00XAJS2301698). （SGNRGF00XAJS2301698）
