What are the factors affecting the price of dry-type transformers?

GNEE dry type distribution transformer

• Choice of insulating material：

Generally speaking, insulation classes F and H are used for the insulation of primary and secondary windings. This is due to the high temperature resistance of these classes i.e. 150°C for class F insulation and 180°C for class H insulation. Generally, varnish and polyester resin are used as the insulating material of the coil. In addition to its excellent temperature resistance and mechanical strength; dielectric strength and thermal shock resistance are the necessary capabilities of the insulation material selected for winding.

• Selection of winding material:

Typically, copper and aluminum are used to make windings or coils. Although copper is a better conductor of electricity, aluminum coil transformers are low cost and lightweight. For the same rated current, a copper conductor with a smaller cross-section is used as the winding material in the transformer. Copper coils have higher mechanical strength than aluminum coils.

• Select a core material with low hysteresis loss:

Core material selection is critical in transformer design. The core material must have high magnetic permeability and low hysteresis loss. Generally, silicon steel, CRGO, etc. are used to achieve the minimum hysteresis loss and high magnetic permeability. The iron loss (ie, no-load loss) of the new amorphous alloy transformer is 70-80% lower than that of traditional transformers that generally use silicon steel as the core. As the loss is reduced, the demand for power generation is also reduced, and the emission of greenhouse gases such as carbon dioxide is also reduced accordingly.

• The rest is the choice of accessories：

Other accessories include, cooling system (the shell is equipped with forced cooling cover, radiator for forced air cooling), controller (temperature controller, protective relay, current transformer), connector (terminal board, plug, socket), scattered accessories ( brackets, washers, screws, etc.).

medium voltage dry type transformers