High-voltage coil structure of resin-cast dry-type transformer, winding method and transformer

Abstract

The invention discloses a high-voltage coil structure of a resin-cast dry-type transformer, a winding method and the transformer. In the scheme, the high-voltage coil structure is a cake type coil structure formed through winding with the forward cake winding method. The gap dead corners in the coil are reduced to the maximum, the local discharge quantity of the coil is greatly reduced, the layer insulation of a wire is eliminated, and materials are saved; the space occupancy of the wire in a winding is increased, the coil size can be reduced under the same wire sectional area, and the cost is lowered.

Description

technical field [0001] The invention relates to transformer technology, in particular to resin cast dry-type transformer technology. Background technique [0002] Resin-cast dry-type transformer high-voltage coils, the general manufacturer's structure is a multi-section cylindrical coil, according to the level of voltage, generally 10kV ~ 35kV high-voltage coils are divided into 4 sections to 12 sections, reducing the number of turns per layer of the coil and reducing the number of coil layers voltage between. When winding, each section is equivalent to an independent multi-layer cylindrical coil, and the interlayer insulation material should be used for the high voltage between the wire layers; the connection between the wires between the sections needs to be welded, and the welding needs to be strengthened for insulation treatment. , to ensure product safety. [0003] In daily production, the working state is often changed, and the work efficiency is low; because each la...

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Problems solved by technology

[0003] In daily production, the working state is often changed, and the work efficiency is low; because each layer has multiple turns of wire arrangement, there is a gap between the lower layer wires, when the upper layer wires press the interlayer insulation tightly on the lower layer wires, the lower layer wires The gap between them will affect the pouring resin. The resin is not poured in, so that there will be air gaps in some places inside the coil after casting, which will increase the partial discharge of the coil, which will cause the discharge of the product to exceed the standard and fail

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