Measurements of the Insulation Resistance in Distribution Transformers of a 20 kV Network

E.I. Koufakis, C.G. Karagiannopoulos, and P.D. Bourkas (Greece)


Distribution transformer, transformer insulating system, life cycle prediction, insulating resistance, dielectric absorption, polarization index.


As the need to improve the reliability of electrical power systems increases, many efforts are made in recent times for the development of reliable methods for the preventive diagnosis and maintenance of transformers. This paper primarily refers to measurements of the insulating resistance of distribution transformers of a 20 KV network. It overhauls the dielectric absorption ratio and the polarization index of 24 distribution transformers and indicates the observations and comments on the condition of the insulation system of the transformers.

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