Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS

PENG Zhaoyu; WANG Shan; LONG Yunfeng; MA Hongming; YANG Zhou; QIU Pengfeng; LI Xu; SUN Zaichao; YANG Kaiyue; LUO Guanghong

doi:10.13296/j.1001-1609.hva.2026.09.010

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Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS

Research on Insulation Medium and Discharge Mechanisms | 更新时间：2026-09-10

- Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS
- High Voltage Apparatus Vol. 62, Issue 9, Pages: 89-98(2026)
- 作者机构：
  
  云南电网有限责任公司电力科学研究院，昆明 650000
  云南电网有限责任公司，昆明 650000
  云南电网有限责任公司怒江供电局，云南怒江 673100
  云南电网有限责任公司临沧供电局，云南临沧 677000
  云南电网有限责任公司楚雄供电局，云南楚雄 675000
  云南电网有限责任公司德宏供电局，云南德宏 678400
- 作者简介：
- 基金信息：
- DOI：10.13296/j.1001-1609.hva.2026.09.010
  CLC：
- Received：22 March 2026，
  
  Revised：2026-05-21，
  
  Published：16 September 2026
- 稿件说明：
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PENG Zhaoyu, WANG Shan, LONG Yunfeng, et al. Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS[J]. High Voltage Apparatus, 2026, 62(9): 89-98.
DOI：

PENG Zhaoyu, WANG Shan, LONG Yunfeng, et al. Simulation of the Spatial Correlation Between X-ray-induced Charged-particle Source Terms and Discharge-sensitive Regions in GIS[J]. High Voltage Apparatus, 2026, 62(9): 89-98. DOI： 10.13296/j.1001-1609.hva.2026.09.010.

摘要

X射线辅助局部放电检测可通过辐射电离提供初始电子，降低微小缺陷放电的统计时延，从而提高隐蔽缺陷的激发和检出概率。针对GIS内部金属、气体和固体绝缘多介质并存条件下辐射诱导二次带电粒子源项尚不明确的问题，文中基于Geant4建立包含SF

气体、中心导体、金属外壳、金属嵌件和环氧绝缘子的GIS真型粒子输运模型，对0.1、1、5、10 MeV入射光子开展蒙特卡罗输运计算。通过统计能量沉积、γ光子相互作用过程、二次电子及正电子产生通道和带电粒子空间分布，分析预电离源项形成规律及其与潜在放电敏感区域的空间关系。结果表明：100 keV光子主要受入射端金属外壳屏蔽约束，二次电子射程较短，预电离源项主要集中于外壳和金属嵌件附近；1 MeV时康普顿散射占比达89.84%，二次电子分布向中心导体、绝缘子和气隙邻近区域扩展；在文中GIS几何模型和入射方向条件下，5～10 MeV光子使中心导体附近成为主要能量沉积和相互作用区域，并出现电子—正电子对产生。研究结果可为X射线辅助GIS缺陷检测参数选择及辐射—放电耦合建模提供源项依据。

Abstract

X-ray-assisted partial discharge detection can provide initial electrons through radiation ionization

thereby reducing the statistical time lag of discharges at microscopic defects and enhancing excitation and detection probability 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 SF

gas

central conductor

metal enclosure

metal inserts

and epoxy insulators 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 spatial distribution of charged particles

the formation characteristics of the pre

-ionization sources terms and their spatial 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 exhibiting 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 secondary 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 production 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.

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