EP-4742284-A1 - HIGH-VOLTAGE WINDING AND DRY-TYPE TRANSFORMER

EP4742284A1EP 4742284 A1EP4742284 A1EP 4742284A1EP-4742284-A1

Abstract

Disclosed is a high-voltage winding (130), comprising a winding body (1310), a high-voltage coil (1320), a high-voltage insulating layer (1330), and an external insulating layer (1340). The winding body (1310) comprises a plurality of winding plates (1313, 2311, 1316); the plurality of winding plates (1313, 2311, 1316) are uniformly distributed in the circumferential direction of the winding body (1310); a wire is wound on the winding plates (1313, 2311, 1316) to form the high-voltage coil (1320); two ends of the wire form two external connections (D, X); the high-voltage insulating layer (1330) wraps the high-voltage coil (1320) and the winding body (1310); and the external insulating layer (1340) wraps the side walls of the external connections (D, X). Further disclosed is a dry-type transformer (10). The high-voltage winding (130) uses the external insulating layer (1340) to wrap the side walls of the external connections (D, X), thereby preventing the permeation of water vapor, ensuring the sealing effect, and effectively avoiding the problem of discharge of a wire outlet end.

Inventors

LIU, JUN
TAO, Wuye

Assignees

Jiangsu Shemar Electric Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240711

Claims (18)

A high-voltage winding, comprising: a winding body, a high-voltage coil, a high-voltage insulating layer, and an external insulating layer, wherein the winding body comprises a plurality of winding plates, the plurality of winding plates being evenly distributed along a circumferential direction of the winding body, wherein a conductor is wound around the winding plates to form the high-voltage coil, two ends of the conductor respectively form two external connectors, wherein the high-voltage insulating layer is wrapped around the high-voltage coil and the winding body, and the external insulating layer is wrapped around sidewalls of the external connectors.
The high-voltage winding according to claim 1, wherein each external connector is further connected to a center conductor, the center conductor being configured to support the each external connector, and the external insulating layer is wrapped around the each external connector and the center conductor.
The high-voltage winding according to claim 2, wherein the each external connector is connected to the center conductor by welding.
The high-voltage winding according to claim 1, wherein the external insulating layer comprises a sheath and a plurality of sheds, wherein the sheath is arranged on outer peripheries of the external connectors, and the plurality of sheds are spaced apart on an outer periphery of the sheath.
The high-voltage winding according to claim 4, wherein each winding plate is provided with a plurality of comb teeth, and the high-voltage coil comprises a plurality of coil sections, wherein at least one of the coil sections is arranged between two adjacent comb teeth on the each winding plate.
The high-voltage winding according to claim 1, wherein the winding body further comprises a plurality of auxiliary members, the plurality of auxiliary members being ring-shaped and spaced apart along an axial direction of the high-voltage winding, wherein the auxiliary members are respectively engaged with and connected to the winding plates.
The high-voltage winding according to claim 1, wherein each winding plate is provided with a plurality of winding members that are movable along the each winding plate, and a winding groove is formed between two adjacent winding members on the each winding plate and is configured to wind the conductor.
The high-voltage winding according to claim 7, wherein each winding member is provided with a moving groove, and the each winding member is slidably connected to the each winding plate through the moving groove.
The high-voltage winding according to claim 8, wherein the each winding plate is an I-shaped long strip, the moving groove in the each winding member is a T-shaped groove, at least part of the each winding plate passes through the moving groove, to enable the each winding member to move along the each winding plate.
The high-voltage winding according to claim 1, wherein the external insulating layer and the high-voltage insulating layer are made of high-temperature vulcanized silicone rubber.
The high-voltage winding according to claim 1, wherein the external insulating layer and the high-voltage insulating layer are integrally injection-molded.
The high-voltage winding according to claim 1, further comprising a semi-conductive shielding layer, the semi-conductive shielding layer being wrapped around an outer peripheral surface of the high-voltage insulating layer.
The high-voltage winding according to claim 12, wherein the semi-conductive shielding layer is a semi-conductive silicone rubber layer formed by an injection process, or the semi-conductive shielding layer is a semi-conductive paint layer formed by a spraying process.
The high-voltage winding according to claim 1, wherein a curved-surface structure is arranged on an outer surface of the high-voltage insulating layer.
The high-voltage winding according to claim 14, wherein a plurality of sheds or a plurality of arc-shaped protrusions are arranged on an outer periphery of the high-voltage insulating layer, the plurality of sheds or the plurality of arc-shaped protrusions being evenly spaced apart along an axial direction of the high-voltage winding to form the curved-surface structure.
The high-voltage winding according to claim 1, wherein an intermediate insulating layer is provided between each winding plate and the high-voltage coil, wherein the intermediate insulating layer is an elastic insulator, the elastic insulator being a silicone rubber gasket, a high-temperature vulcanized silicone rubber layer, a liquid silicone rubber layer, or a room-temperature vulcanized silicone rubber layer.
The high-voltage winding according to claim 16, wherein the intermediate insulating layer comprises a first insulating layer and a second insulating layer, wherein the first insulating layer is wrapped around an outer periphery of the each winding plate, the second insulating layer is wrapped around an outer periphery of the conductor, so that the intermediate insulating layer is located between the winding body and the high-voltage coil, wherein the first insulating layer and the second insulating layer are liquid silicone rubber layers.
A dry-type transformer, comprising an iron core, a low-voltage winding, and the high-voltage winding according to any one of claims 1 to 17, wherein the low-voltage winding is sleeved on the iron core, and the high-voltage winding is sleeved on the low-voltage winding.

Description

TECHNICAL FIELD The present application relates to the field of dry-type transformer manufacturing, and in particular, to a high-voltage winding and a dry-type transformer. BACKGROUND In a conventional silicone rubber dry-type transformer, lead-out terminals of a high-voltage winding require connection to structures such as a lead-out bushing and a heat-shrink tube to prevent the problem of discharge at the lead-out terminals. The lead-out bushing generally has a structure formed by casting an epoxy resin insulating layer around a conductive copper rod or by reinforcing the conductive copper rod with a fiberglass-reinforced plastic barrel and then casting liquid silicone rubber sheds thereon. However, this structure cannot be integrally formed with an insulating layer of the high-voltage winding, requiring the design of a sealed structure, which has a problem of sealing failure. The heat-shrink tube typically encapsulates the lead-out terminals by using materials such as PVC or PEC, which cannot achieve a complete seal. Rainwater seeping into the heat-shrink tube may corrode a conductor and affect insulation properties of the product. In addition, the above structures require additional processing and overall assembling, resulting in a long processing cycle. SUMMARY With respect to the shortcomings in the prior art, an object of the present application is to provide a high-voltage winding to solve the problem of sealing failure at lead-out terminals of an existing high-voltage winding. To achieve the above object, the present application employs the following technical means: a high-voltage winding, including a winding body, a high-voltage coil, a high-voltage insulating layer, and an external insulating layer. The winding body includes a plurality of winding plates. The plurality of winding plates are evenly distributed along a circumferential direction of the winding body. A conductor is wound around the winding plates to form the high-voltage coil. Two ends of the conductor respectively form two external connectors. The high-voltage insulating layer is wrapped around the high-voltage coil and the winding body. The external insulating layer is wrapped around sidewalls of the external connectors. Preferably, each external connector is further connected to a center conductor. The center conductor is configured to support the each external connector. The external insulating layer is wrapped around the each external connector and the center conductor. Preferably, the each external connector is connected to the center conductor by welding. Preferably, the external insulating layer includes a sheath and a plurality of sheds. The sheath is arranged on outer peripheries of the external connectors. The plurality of sheds are spaced apart on an outer periphery of the sheath. Preferably, each winding plate is provided with a plurality of comb teeth, and the high-voltage coil includes a plurality of coil sections. At least one of the coil sections is arranged between two adjacent comb teeth on the each winding plate. Preferably, the winding body further includes a plurality of auxiliary members. The plurality of auxiliary members are ring-shaped and spaced apart along an axial direction of the high-voltage winding. The auxiliary members are respectively engaged with and connected to the winding plates. Preferably, each winding plate is provided with a plurality of winding members that are movable along the each winding plate. A winding groove is formed between two adjacent winding members on the each winding plate and is configured to wind the conductor. Preferably, each winding member is provided with a moving groove, and the each winding member is slidably connected to the each winding plate through the moving groove. Preferably, the each winding plate is an I-shaped long strip, the moving groove in the each winding member is a T-shaped groove. At least part of the each winding plate passes through the moving groove, to enable the each winding member to move along the each winding plate. Preferably, the external insulating layer and the high-voltage insulating layer are made of high-temperature vulcanized silicone rubber. Preferably, the external insulating layer and the high-voltage insulating layer are integrally injection-molded. Preferably, the high-voltage winding further includes a semi-conductive shielding layer. The semi-conductive shielding layer is wrapped around an outer peripheral surface of the high-voltage insulating layer. Preferably, the semi-conductive shielding layer is a semi-conductive silicone rubber layer formed by an injection process, or the semi-conductive shielding layer is a semi-conductive paint layer formed by a spraying process. Preferably, a curved-surface structure is arranged on an outer surface of the high-voltage insulating layer. Preferably, a plurality of sheds or a plurality of arc-shaped protrusions are arranged on an outer periphery of the high-voltage insulating layer. The p