Dry type distribution transformer
Sönmez Transformer Company
The construction of a transformer comprises two active components: the ferromagnetic core and the windings. Within the transformer industry, the core and windings together are normally referred to as the "active part". The passive part of a transformer is the cooling system, consisting of the tank and the cooling liquid (mineral oil, silicone liquid or synthetic organic esters).
Core
The core is constructed using thin sheets of cold-rolled grain-oriented magnetic silicon steel insulated on both sides. Conventional grain oriented steel (CGO steel) is used for transformers with normal no-load loss characteristics, while transformers with reduced no-load losses are built using higher-quality HiB steel (usually laser treated).
Winding
Low voltage windings are usually made of copper or aluminium sheet conductor (foil). The benefit of this is that any high voltage ampere-turn asymmetry which might occur is compensated automatically by an appropriate internal current distribution in the low voltage foil.
High voltage windings are almost exclusively of layered construction. The copper or aluminium conductors are made of one or more round or square wires, either with an insulating enamel coating or wrapped in insulating paper(according to insulating class). Each design is drawn up in accordance with the specific characteristics of the conductor material to be used.
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