There is typically a high level of non-linear load in renewable energy and data centre applications, which generates significant harmonics. Dry-type transformers can be designed to withstand these high levels of harmonic and non-linear load – which create additional heat in the equipment. This can also cause leakage currents, which need to be addressed using an electrostatic shield. This is installed between the low voltage (LV) and medium voltage (MV) windings, to deal with any stray earth current that occurs as a result of the non-linear load.
A key aspect in designing the transformer is the use of a special type of resin for the MV winding. This renders the transformer more suitable for changing load conditions. Particularly with renewable energy applications, the transformer varies between being fully loaded and unloaded every day. The specialised resin more effectively accommodates the frequent contraction and expansion of the windings. Flux densities can also be altered in the design to cater for the non-linear load.
There is typically a high level of non-linear load in renewable energy and data centre applications, which generates significant harmonics. Dry-type transformers can be designed to withstand these high levels of harmonic and non-linear load – which create additional heat in the equipment.