Вопросы измерения потерь холостого хода в эксплуатации для контроля состояния силовых трансформаторов

Abstract

No-load losses measurements of power transformers during operation have been widely used to assess the condition of their magnetic system. Since it is not always possible in operating conditions to carry out such measurements with excitation of transformer by rated voltage, in the middle of the last century, a method for measuring them at a low voltage, which is several percent of the rated voltage, was proposed to control the change in the no-load losses in operation. Due to small excitation voltage, the measurement results are significantly affected by changes in the condition of the magnetic system and residual magnetization, which in practice can lead to diagnostic errors. The article deals with the practical application of no-load losses measurements to assess the condition of transformers, provides examples of erroneous rejection of serviceable transformer equipment, and provides proposals for the development of existing rules in terms of permissible no-load losses increase.