Experimental Determination of Temperature Influence on No-Load Losses and Transformation Coefficient of Power Three-Phase Two-Winding Transformer

Abstract

The results of experimental determination of the influence of temperature on the no-load losses and the transformation coefficient of a power three-phase two-winding transformer are presented. Experimental studies were carried out at phase voltages on the higher voltage windings of the tested power transformer equal to 200, 210, 220, 230, 240 V, in accordance with the requirements of GOST 3484.1 for conducting the experiment of idling and determining the transformation coefficient. According to the results of the pilot study concluded that with increasing temperature the magnetic system power three-phase two-winding transformer 32 °C the total losses of active power idle in all three phases decrease on average by 1,5 % for the phase voltages in the range of ± 10 % from the nominal value of 220 V. The transformation coefficient of a power transformer with the same change in temperature and phase voltages practically does not change.