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<p>To address the challenge that the internal structure of gas insulated switchgear is fully enclosed and its operating condition cannot be directly observed this study develops a multispectral fiber scope imaging system that enables in situ and coordinated observation of internal structural conditions temperature distribution and optical characteristics of partial discharge. The system combines visible infrared and ultraviolet imaging channels and integrates a high density special image transmitting fiber bundle high voltage gas tight packaging and a wide field optical probe design which overcomes the long standing limitation of poor visibility inside sealed high voltage environments. Through simulation experiments of typical overheating and discharge defects the system demonstrates stable imaging performance under complex electromagnetic conditions and shows the complementary advantages of multispectral information. Field validation on a 500&#xa0;kV GIS installation further confirms that the system can be integrated into operating GIS equipment without power interruption or enclosure opening and can provide stable internal visual information during on-site commissioning and testing. These results indicate that multispectral fiber-scope imaging offers an effective and practical approach for internal condition sensing and assisted diagnosis of high-voltage electrical equipment, supporting intelligent condition monitoring, reliability enhancement, and sustainable operation and maintenance of smart power grids.</p>

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Application of a Multispectral Fiber-Scope Imaging System for In-Situ Diagnosis of Internal Defects in High-Voltage Electrical Equipment

  • 期刊论文

  • 发表日期：

    2026年6月17日

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  • Yanhui Meng,
  • Zihui Yin,
  • Ruifeng Zhou,
  • Zhilong Zhao,
  • Nan Zhang

摘要

To address the challenge that the internal structure of gas insulated switchgear is fully enclosed and its operating condition cannot be directly observed this study develops a multispectral fiber scope imaging system that enables in situ and coordinated observation of internal structural conditions temperature distribution and optical characteristics of partial discharge. The system combines visible infrared and ultraviolet imaging channels and integrates a high density special image transmitting fiber bundle high voltage gas tight packaging and a wide field optical probe design which overcomes the long standing limitation of poor visibility inside sealed high voltage environments. Through simulation experiments of typical overheating and discharge defects the system demonstrates stable imaging performance under complex electromagnetic conditions and shows the complementary advantages of multispectral information. Field validation on a 500 kV GIS installation further confirms that the system can be integrated into operating GIS equipment without power interruption or enclosure opening and can provide stable internal visual information during on-site commissioning and testing. These results indicate that multispectral fiber-scope imaging offers an effective and practical approach for internal condition sensing and assisted diagnosis of high-voltage electrical equipment, supporting intelligent condition monitoring, reliability enhancement, and sustainable operation and maintenance of smart power grids.