Gas Insulated Switchgear (GIS) is an indispensable component in modern high-voltage power transmission systems, offering a compact and reliable means of managing electrical energy. Nevertheless, its hermetic configuration—pressurized with insulating gases such as SF6—creates obstacles for monitoring internal components. Conventional monitoring approaches lack the capability to provide real-time, non-intrusive data on the operational condition of GIS. This study examines the development of high-performance dielectric windows based on transparent polymer materials, as well as the integration of advanced visual monitoring technologies. The goal is to strengthen the diagnostic capabilities of GIS, thereby improving the safety, reliability, and operational efficiency of power grids.