Optimization of Design of Very High Power Transformers in Power System

The research carried out aims at reducing the exploitation costs in case of very high power transformers which operate in the power system. Active and reactive electrical energy losses are high in these transformers and, taking into account their long duration of operation, there result very high exploitation costs. That is why, this paper shows that an optimal design of this transformer, taking also into account the imposed restrictive conditions (gauge dimensions, short-circuit voltage), can substantially reduce this cost. For example, in case of the transformer rated at 250 MVA, optimally designed, the exploitation cost was reduced by Delta ce=14.319%=1539000 (sic), as against the existing transformer. The simulations carried out and presented justify the optimum constructive solution, proposed.