Winding is an important part of dry-type transformer, which is composed of transmission line and insulation. Transformer engineering calculations are inseparable from the winding. The primary and secondary windings are composed of the dry-type transformer electrical control system. The structure and structural dimensions of the winding determines the transformer characteristics “Measurement of the winding, not only to achieve the transmission capacity, voltage ratio, characteristic impedance and other technical properties, and also to ensure that the winding has sufficient insulation strength, high temperature resistance strength impact toughness.

Heart type transformer winding cross-section is generally circular winding construction form has a round simple type, spiral type, rotary type, worry type or cell phone within the screen type and other different. Furnace transformer with transformer storm and low voltage transformer, when the regulator transformer and transformer mounted to the same oil tank, its low-voltage windings are also used 8-type winding. Some special transformers, but also the use of double talk type and with bare copper bending planing of the low-voltage winding. Measurement of the winding should first be based on the capacity of the winding, the working voltage and its transformer method and other provisions of the construction of a reasonable selection of the winding form.

1.1 Dry-type transformer drum winding

Figure simple winding is generally by the cheap transmission line or figure wire – minister leaning against the side of the winding, during which there is no gap, this kind of primaquine; impact toughness is weaker heat-exhausted area is small, so generally used for small capacity transformer. It also has a single round simple type, two round simple type, double round simple type and by section round simple type difference.

Single-sided round simple winding only a layer of wire turns, the head and tail of the winding at the end of the winding lead out. The two-layer round simple winding has only two layers of turns. The head and tail of the winding are led out at the same end of the winding. The solid layer is insulated and heat-exhausted according to the provisions of the main oil pipeline (or air pipe) or padded with solid insulation. Because the single, two-layer round simple winding can accommodate the thin wire bandit is small, so generally used for 630kVA and the following small-capacity transformer low-voltage winding.

Double-layer round simple type has more than two star fine line minister. The first genus can also be in the winding of the same lake out of the middle of the group from the junction can also lead out of the transformer using the tap according to the insulation layer and exhaust heat regulations, there are one or more solid layer placed in the main oil channel or road), other solid layer pad) solid insulation. Because the double-layer around the simple type of group can accommodate the

The line west is more, so generally used for 630KVA and the following small-capacity transformer, as 3035W high-voltage winding.

Wu according to the section of the district simple winding is by a good radial sort of multi-layer medical cylinder type group ShenLian composed of each double-layer round simple winding is called a – section. The center of each segment is paper or

Because of the large number of wires that can be accommodated by the section surface cylinder winding, it can be used as: 2000kVA and below small capacity transformer as 60kV and below high voltage winding.

1.2 Spiral winding for dry-type transformers

Spiral winding is made of several flat transmission lines and winded, especially as a single-sided diagram of the simple group: but the neighboring wires should be separated by pads, and each section is a sink, the impact toughness of this type of winding is higher than that of the national cylindrical type. Heat dissipation area is also very large: but its ability to accommodate the scarcity of fine wire less, so generally used in a variety of capacity transformer low-voltage winding, spiral energy group also has a single spiral Go fixed, double spiral and four spiral and so on.