Determination of Magnetic Losses in a Transformer by Wattmetric Method
The purpose of the article is to describe the methodology for determining the components of losses in the magnetic circuit of a transformer. Based on current empirical knowledge about the extent to which each of the three components of the losses in the steel of the magnetic circuit depends on the frequency of the magnetic field, a wattmetric method for determining these losses has been developed. The method consists in measuring the total losses in the magnetic circuit at three frequencies using the idle experience and calculating the three components of the losses. It does not matter to what extent each component depends on the amplitude of mag-netic induction or other parameters. It has been established that it is advisable to carry out idling experiments in the range of 50 ... 70 Hz, in which there is no dynamic measurement error, and the frequency error of the coefficients of the calculated matrix is negligible. The results obtained for a single-phase transformer are in good agreement with modern ideas about the ratio of the three components of the losses in the magnetic circuit.