Study About the Active/Reactive Power Balance of a 110/6 kV Transformer

Power transformers are probably one of the most complicated and most important equipment working inside the power transmission and distribution system. The assessment of the technical status is performed with the double purpose of extending its life and to reduce all risks. It is a complex and important task, depending on the role of that transformer inside the system. It could be a routine set of investigations or special investigations that appeal to the latest techniques and methods of measurement. In order to get a correct diagnosis, the measured data must be as accurately obtained, correlated and evaluated starting from the applicable technical regulations, the latest recommendations and information from the literature, and based also on the similar technical experience. This paper will present a case study for the variation of the load efficiency (the efficiency) as well as some economical aspects, based on real measurements and technical data sheet parameters.