高压电器2026，Vol.62Issue(9)：89-98,10.DOI:10.13296/j.1001-1609.hva.2026.09.010
GIS内X射线诱导带电粒子源项与放电敏感区关联模拟
Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS
摘要
Abstract
X-ray-assisted partial discharge detection can provide initial electrons through radiation ionization,there-by reducing the statistical time lag of discharges at microscopic defects and enhancing excitation and detection prob-ability of concealed defects.In view of the ambiguity regarding radiation-induced secondary charge particle source terms under the multi-media coexistance condition of metals,gas and solid insulation within GIS,a full-scale GIS particle transport model incorporating SF6 gas,central conductor,metal enclosure,metal inserts,and epoxy insula-tors is developed using Geant4 in this study.Monte Carlo transport calculation is performed for incident photons and energies of 100 keV,1 MeV,5 MeV,and 10 MeV.By statically analyzing the statistical energy deposition,γ-photon interaction processes,generation channels of secondary electron and positron productio,as well as the spa-tial distribution of charged particles,the formation characteristics of the pre-ionization sources terms and their spa-tial correlation with potential discharge-sensitive regions are investigated.The results indicate that 100 keV photons are primarily shielded and constrained by the metal enclosure at the incident end,with secondary electrons exhibit-ing a short secondary range,and the pre-ionization sources terms being mainly concentrated near the enclosure and and metal inserts.At 1 MeV,Compton scattering accounts for 89.84%of the interactions,and the distribution of sec-ondary electrons extends toward the central conductor,insulator and the regions adjacent to gas gaps.Under the GIS geometric model and incident direction conditions adopted in this paper,5～10 MeV photons render the vinicity of the central conductor the primary region for energy deposition and interactions,where electron-positron pair produc-tion also occurs.The study results can provide source-term references for parameters selection in X-ray-assisted GIS defect detection and fo radiation-discharge coupled modeling.关键词
GIS/X射线/Geant4/SF6/康普顿散射/二次电子/能量沉积Key words
GIS/X-rays/Geant4/SF6/Compton scattering/secondary electrons/energy deposition引用本文复制引用
彭兆裕,罗光鸿,王山,龙云峰,马宏明,杨舟,邱鹏锋,李旭,孙再超,杨凯越..GIS内X射线诱导带电粒子源项与放电敏感区关联模拟[J].高压电器,2026,62(9):89-98,10.基金项目
南方电网公司科技项目(基于短波外源辐照的组合电器设备绝缘件缺陷高效激发及快速检出关键技术研究 课题一:短波外源激发绝缘缺陷放电检测方法及局放联合检测装置开发). Project Supported by Science and Technology Project of China Southern Power Grid Co.,Ltd.(Research on Key Technologies for the Efficient Excitation and Rapid Detection of Insulation Defects in Switchgear Based on Short-wave External Irradiation—Topic 1:Development of a Method for Detecting Insulation Defect Discharges via Short-wave External Excitation and a Combined Partial Discharge Detection Device). （基于短波外源辐照的组合电器设备绝缘件缺陷高效激发及快速检出关键技术研究 课题一:短波外源激发绝缘缺陷放电检测方法及局放联合检测装置开发）
