Influence of Electric Substation Disturbances on Dielectric Dissipation Factor Variation at Bushings

S.-D. Nedelcut, D. Sacerdotianu, and D.-M. Purcaru (Romania)


Isolated bushing; capacitor; insulator; transformer


At present, the tendency to implement the condition-based maintenance (CBM), which allows the optimization of the expenses for equipment monitoring, is more and more evident; also, the transformer substations with remote monitoring are increasingly used. This paper reviews all the advantages of the on-line monitoring and presents an original equipment for on-line monitoring of bushings. The paper presents a study of the temperature field, using the finite element method. For carrying out this study, the 3D modelling of the above mentioned bushing was performed. The analysis study is done taking into account the extreme thermal stresses, focusing at the level of the first cooling wing section of the ceramic insulator. This fact enables to justify the tanĪ“ variation in time, depending on the transformer loading and the environmental conditions.

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