NOVEL HIGH-VOLTAGE LEAD STRUCTURE FOR THREE-DIMENSIONAL WOUND CORE OF TRANSFORMER

Abstract

Disclosed is a three-dimensional wound core transformer high-voltage lead structure, comprising a three-dimensional wound core (1) formed by three rectangular single frames, and A-phase, B-phase and C-phase windings (2), wherein the three-dimensional wound core comprises three core posts and an upper yoke and a lower yoke, the upper yoke and lower yoke of the three-dimensional wound core are respectively triangular structures, the A-phase, B-phase and C-phase windings are correspondingly arranged on the three core posts, each winding comprises an internal low-voltage winding and an external high-voltage winding, and the A-phase, B-phase and C-phase high-voltage windings are jointly connected via a lead-out line (3) to a tap changer (4); and characterised in that the tap changer is located outside the triangular structure of the upper yoke, and on a vertical extension line at a mid-point between the A-phase and the C-phase windings. The high-voltage lead structure means that the lead length is greatly shortened, few lead clamps are needed, and lead to ground discharge points are significantly reduced, improving the reliability of transformer products.

Claims

1. A high-voltage lead structure for a three-dimensional wound core of a transformer, comprising A-phase, B-phase and C-phase windings; and a three-dimensional wound core spliced by three rectangular single frames and comprising three core legs, an upper iron yoke and a lower iron yoke; the upper iron yoke and the lower iron yoke of the three-dimensional wound core are triangular structures respectively; the A-phase, B-phase and C-phase windings are correspondingly arranged in the three core legs; each single-phase winding has an internal low-voltage winding and an external high-voltage winding; high-voltage windings of the A-phase, the B-phase and the C-phase are jointly connected to a tap switch through lead-out wires; and the tap switch is located outside the triangular structure of the upper iron yoke and is arranged in a vertical extension line of a midpoint between the A-phase and C-phase windings.

2. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 1, wherein the lead-out wire of the B-phase high-voltage winding is located in the vertical extension line of the midpoint between the A-phase and C-phase windings.

3. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 2, wherein the lead-out wire of the B-phase high-voltage winding is located in the triangular structure of the upper iron yoke.

4. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 1, wherein the lead-out wires (3) of the A-phase and C-phase high-voltage windings are located outside the triangular structure of the upper iron yoke.

5. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 1, wherein the rectangular single frame is continuously wound by a plurality of sheets or amorphous alloy strips of silicon steel.

6. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 2, wherein the lead-out wires of the A-phase and C-phase high-voltage windings are located outside the triangular structure of the upper iron yoke.

7. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 3, wherein the lead-out wires of the A-phase and C-phase high-voltage windings are located outside the triangular structure of the upper iron yoke.

8. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 2, wherein the rectangular single frame is continuously wound by a plurality of sheets or amorphous alloy strips of silicon steel.

9. The high-voltage lead structure for a three-dimensional wound core of a transformer according to claim 3, wherein the rectangular single frame is continuously wound by a plurality of sheets or amorphous alloy strips of silicon steel.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:

[0014] FIG. 1 is a structure diagram according to the disclosure.

DETAILED DESCRIPTION

[0015] The disclosure is further described below with reference to the drawings and the embodiments.

[0016] As shown in FIG. 1, a novel high-voltage lead structure for a three-dimensional wound core of a transformer according to the disclosure includes a three-dimensional wound core 1 spliced by three rectangular single frames, and A-phase, B-phase and C-phase windings, wherein the three-dimensional wound core 1 includes three core legs, an upper iron yoke and a lower iron yoke. The upper iron yoke and the lower iron yoke of the three-dimensional wound core 1 are triangular structures respectively. The A-phase, B-phase and C-phase windings 2 are correspondingly arranged in the three core legs, wherein each single-phase winding 2 includes an internal low-voltage winding and an external high-voltage winding. High-voltage windings of the A-phase, the B-phase and the C-phase are jointly connected to a tap switch 4 through lead-out wires 3. The tap switch 4 is located outside the triangular structure of the upper iron yoke and is arranged in a vertical extension line of a midpoint between the A-phase and C-phase windings.

[0017] The lead-out wire 3 of the B-phase high-voltage winding is located in the vertical extension line of the midpoint between the A-phase and C-phase windings.

[0018] The lead-out wire 3 of the B-phase high-voltage winding is located in the triangular structure of the upper iron yoke.

[0019] The lead-out wires 3 of the A-phase and C-phase high-voltage windings are located outside the triangular structure of the upper iron yoke.

[0020] According to the disclosure, by adjusting a position of a B-phase lead-out wire of the high-voltage winding and a distance between the A-phase and the C-phase, an output end of the lead-out wire 3 of the B-phase high-voltage winding and a tap are concentrated in a middle of the distance between the A-phase and the C-phase. The lead-out wire 3 of the B-phase high-voltage winding is directly penetrated from the middle of the A-phase and the C-phase, and is led to the tap switch. Positions of tapped lead-out wires 3 of the A-phase and the C-phase directly face the tap switch 4, so that a length of the lead is greatly shortened, the required lead clamping pieces are few, and discharge points of the lead to the ground are greatly reduced, thus improving the reliability of a transformer product.

[0021] The rectangular single frame is continuously wound by a plurality of sheets or amorphous alloy strips of silicon steel.

[0022] It should appreciate that, the description above does not limit the disclosure, and the disclosure is not limited to the embodiments above. Any variation, modifications, additions or substitutions made by those skilled in the art within a substantial scope of the disclosure shall also fall within the protection scope for the disclosure.

[0023] It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described herein above. In addition, unless mention was made above to the contrary, it should be noted that all of the accompanying drawings are not to scale. A variety of modifications and variations are possible in light of the above teachings without departing from the scope and spirit of the invention, which is limited only by the following claims.