Double-U-shaped coil

Abstract

The invention relates to a transformer coil, in particular to a double-U-shaped coil. The double-U-shaped coil comprises an upper part coil and a lower part coil, wherein an axial insulating mechanism is arranged between the two coils; both the upper part coil and the lower part coil have a U-shaped structure consisting of an inner layer coil and an outer layer coil; and the upper part coil and the lower part coil are connected with each other through an outer lead. In the double-U-shaped coil, the coils are arranged in a segmented mode, so the reactance height is effectively lowered, the main insulation distance is widened, flexible changes in a connecting mode and a winding mode can be realized, impedance can be adjusted conveniently, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to a transformer coil, in particular to a double U-shaped coil. Background technique [0002] The low-voltage coils of large power transformers are generally multi-helical or double-layer cylindrical coils (single U-shaped). The multi-helical coil is axially wound around the cylinder, the number of coil turns is large, and the axial length is large, resulting in a high reactance height and an increased fuel tank height. Due to the limitation of the transportation height of the fuel tank, double-layer cylindrical coils are generally used now. The double-layer cylindrical type is to wind the wire along the inner layer first, then bend the wire, and then reversely wind along the outer layer after lifting the layer. The same coil is set in sections, which effectively reduces the reactance height of the coil and meets the requirements for the transportation height of the fuel tank. However, in order to meet the insulation requirements...

AI Technical Summary

Problems solved by technology

The multi-helical coil is axially wound around the cylinder, the number of coil turns is large, and the axial length is large, resulting in high reactance height and increased fuel tank height

Due to the limitation of the transportation height of the fuel tank, double-layer cylindrical coils are generally used now. The double-layer cylindrical type is to wind the wire along the inner layer first, then bend the wire, and then reversely wind along the outer layer after lifting the layer. The same coil is set in sections, which effectively reduces the reactance height of the coil and meets the requirements for the transportation height of the fuel tank. However, in order to meet the insulation requirements, the width of this coil needs to be set larger, resulting in a very tight main insulation distance, and higher cost

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