Abstract
The article presents a method of determining dielectric losses that occur in insulating materials in a power transformer. These losses depend mainly on the electric field stress, pulsation, dielectric loss coefficient, and electrical permittivity of insulating materials. These losses were determined by integrating an expression describing unit losses. The determined dielectric losses were compared with the total losses of the transformer. It turned out that dielectric losses are a fraction of a percent of the total losses. The influence of the electrical permittivity of the insulating liquid and paper insulation on the value of dielectric losses was investigated. This influence was ambiguous, which is characteristic of stratified systems made of materials with different permittivity. An analysis of the influence of the dielectric loss coefficient tan(delta) on the value of dielectric losses in the transformer was carried out. The impact of this coefficient on the amount of dielectric losses turned out to be directly proportional.
Highlights
Most of the dielectric losses occurred in the electrical insulating liquid, which is due to the larger volume of the liquid compared to the volume of paper insulation
The electrical permittivity of paper insulation and the electrical insulating liquid has an ambiguous effect on the value of dielectric losses in the transformer
This effect should be related to the electric field stress in individual insulating materials, which depends on the ratio of electrical permittivity of these materials
Summary
The article does not present dielectric losses in paper or other liquids, and the authors do not determine the dielectric losses in the transformer. In [12], the authors present results referring to particle layers, employing conductive transition metal nitrides as a proposition of alternative materials for photovoltaic applications in order to decrease losses compared to metal nanostructures. They explain different dielectric properties, such as dielectric losses, but they do not present the value of dielectric losses in any electric power device. The article analytically determines the dielectric losses of a 220/110 kV electric power transformer, which occur in its insulation system (paper-oil). The authors analyzed the effect of the dielectric loss coefficient tan(delta) on dielectric losses
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