Temperature Distribution in the Insulation System of Condenser-Type HV Bushing—Its Effect on Dielectric Response in the Frequency Domain

HV bushings are an important part of the equipment large power transformers, responsible for their many serious (including catastrophic) failures. Their proper exploitation needs to apply correct and reliable diagnostics, e.g., use dielectric response methods, that take into account specific construction working conditions. In this article, based on laboratory tests carried out a real bushing, it has been shown significant temperature distribution within its core significantly affects shape insulation; therefore, approach modeling should be changed. Hence, new method interpreting results, using so-called 2XY model, is proposed. Subsequently, measurements made insulators in operation, was verified. conclusion, can stated model improves reliability analysis, which confirmed future by withdrawn revised insulators.