This thesis is performed at WSP in Skellefteå, specializing in Rönnskär Education in Skelleftehamn.
Rönnskär’s construction began by Boliden AB in 1928 and it was ready for production in 1930. It produces copper, lead, zinc clinker, gold and silver. In 2010 Rönnskär produced 190000 tons of copper and in 2013 it produced 206 000 tons. Current number of employees is 866.
The electricity supply of the industrial area of Rönnskär is in very high priority and transformer failures leading to lengthy downtime and expensive repairs. Power transformers must have high operational availability transformers which purchases for production must be robust.
This is a comparative study between dry type and oil insulated transformers which summarized in form of recommendation for the future purchases.
The work will highlight the parameters of operational availability and operational safety make calculations for rated short time currents and losses in transformers based on manufacturers data.
The aim of this thesis is to compare various parameters of dry and oil immersed transformers from different manufacturers summarized in a comparison table according to the apparent power and voltage which shows the difference between various types of transformers.
This work is primarily based on the theory of transformers and at the same time on continuous dialogue with the client and the transformer manufacturer.
The recommendations should be viewed as a preliminary study, a deeper analysis and further investigation is required when purchasing transformers, depending on the circumstances and the conditions.
An economic analysis has not been performed because of the limited information.
Keyword for this study is AOS: Availability and Operational Safety.