Microscopic Investigation of Surface Microstructure and Material Composition in Standard Insulating Cardboard for UHV Transformers

The traditional evaluation system of extra-high voltage insulating paperboard ignores the influence of microstructure on its performance. The aim of this study is to study the microstructure of the insulating paper surface based on microscopic techniques as well as the composition analysis, to explore the relationship between the microstructure and the macro performance, and to provide a theoretical basis for the optimisation of the production process and quality control. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to comprehensively analyse the micro-morphology, elemental composition and the range of fluctuation of carbon (c) and oxygen (o) elements of insulating paperboards of different manufacturers, so as to make a comprehensive assessment of insulating paperboards at both microscopic and macroscopic levels, and to be able to reveal the mechanism of the formation of its properties in a more in-depth way, which can help to optimise the production process and improve the quality of the product, and thus provide a theoretical basis for further Understanding its performance in different working environments provides a theoretical basis, and provides a scientific basis for the accurate selection of materials in transformer design.