An Approach for Parameters Estimation of On-load Two Windings Transformers

Rodrigo Nobis da Costa Lima¹; José Rubens Macedo Junior¹

¹ Universidade Federal de Uberlândia

Resumo

An appropriate modelling of transformers is an important requisite for computational studies of electrical systems. Its relevance and the amount of installed transformers on the alternate current grid is massive, what gives this equipment a relevant impact into almost every kind of study. Many methodologies to estimate parameters and model transformers are found in the literature, but most of them are dependent of some tests, which require the disconnection of the equipment, making it hard to apply these methods on transformers that are already operating. Other papers describe methodologies that are independent of the equipment disconnection, however, many of them rely on information that can be hard to attend, like the knowledge of the load characteristic. On the other hand, this paper presents a simple method for measuring and modelling two windings transformers that are already installed and operating, without the need of any special condition but an appropriate waveform meter. The proposed methodology is validated by three industrial plants measurements.

Palavras-chave: transformer modelling; transformer parameters; transformer measurement