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Construction Types and Winding Connections
Learn about the principal types of power transformer construction and how the typical magnetic circuits and winding arrangements affect the flow of triple- harmonics and zero-sequence currents.
Two principal types of transformer construction embody the requirements of economics, ease of manufacture, insulation, mechanical strength, and ventilation: core-type and shell-type. The key distinction between the two types lies in the core and winding placement. For core-type transformers, the windings encircle the core, while in shell-type transformers, the core encircles the windings.
There are four ways to connect the primary and secondary windings of the transformers symmetrically. These combinations, along with the typical magnetic circuits configurations, have a profound impact on the transformer and power system performance.
There are four ways to connect the primary and secondary windings of the transformers symmetrically. These combinations, along with the typical magnetic circuits configurations, have a profound impact on the transformer and power system performance.
Arrays of Iron and Coils in Single-phase Transformers
Again, there are two general types of transformers depending on the arrangement of the iron and copper: core-type and shell-type.
In core-type transformers, the iron core is in the form of a hollow square made up of sheet-steel laminations, and the windings surround it. Figure 2 represents, diagrammatically, a core-type transformer.
