Identification of Sulphide Content in Pressboard Insulation in Transformer Adopting LIBS and Wavelet Technique

In transformers, silver sulfide and copper sulfide can form and cause a significant threat to its life. Identification of sulfur content formation in transformer insulation and diagnosing the level of its migration in pressboard material is a major challenge. In the present study, methodical experimental studies were carried out for sulfide formation and for its diffusion in pressboard material. The level of diffusion of sulfur content in the pressboard was diagnosed by adopting laser-induced breakdown spectroscopy (LIBS). The wavelet technique was adopted to enhance the LIBS signal thereby enhancing the efficiency of the technique for identification of the level of diffusion of sulfide contents.