# Improvement of the evaluation method of calculation of power losses in power transformer

## Authors

• O.S. Pidlisniy O.S. Student of the Faculty of Electrical Engineering of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia, Ukraine
• S.P. Lushchin Ph.D, Associate professor, Associate professor of the department of physics of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia, Ukraine

## Keywords:

, power losses, power transformer, efficiency, analytical and calculation method, transformer efficiency

## Abstract

Purpose. The purpose of the work is to perform analytical analysis of methods for calculating power losses of a power transformer and to improve the estimation method of calculation to increase the accuracy of calculating power losses on the example of an industrial power transformer.

Methodology. Analytical and calculation method was used to determine power losses in the power transformer.

Findings. Analysis of the main power losses of power transformers is an important task to determine the optimal conditions for their operation. Analytical analysis of transformer power loss calculation methods is carried out. The relative contribution of different types of power losses is shown. The calculation of energy losses of the power transformer TM 1000/10/0.4 is performed. The losses of active and reactive energy of the transformer are determined. The efficiency of the power transformer is calculated. A generalizing formula for determining the efficiency of the transformer is proposed.

Originality. On the basis of the analytical analysis of methods of calculation of power losses of the power transformer the estimation technique is improved and calculation of losses of active and reactive energy of the industrial power transformer TM 1000/10/0.4 is carried out. A new generalizing formula for determining the efficiency of a power transformer, which takes into account the operating time of the transformer at maximum load, is proposed.

Practical value. The estimation method for calculating the power losses of an industrial power transformer under load is improved, in which a generalizing formula for determining the efficiency of a transformer is applied. The proposed technique simplifies the calculations, reduces the estimated time to determine the operating parameters of the power transformer with the required accuracy. The proposed technique was tested on the example of the power transformer TM 1000/10/0.4. It is shown that with increasing maximum load time, the efficiency of the transformer increases and asymptotically approaches the maximum value.

## Author Biographies

### O.S. Pidlisniy O.S., Student of the Faculty of Electrical Engineering of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia

Student of the Faculty of Electrical Engineering of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia

### S.P. Lushchin, Ph.D, Associate professor, Associate professor of the department of physics of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia

Ph.D, Associate professor, Associate professor of the department of physics of the National University ”Zaporizhzhia Polytechnic”, Zaporizhzhia

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