CN219349969U

CN219349969U - Middle lifting insulating structure of crossed coil of balance traction transformer

Info

Publication number: CN219349969U
Application number: CN202320405515.4U
Authority: CN
Inventors: 郑会奇; 陆瀚; 朱桂英; 王强; 蒋雍
Original assignee: Clp Jiangsu Transformer Manufacturing Co ltd
Current assignee: Clp Jiangsu Transformer Manufacturing Co ltd
Priority date: 2023-03-07
Filing date: 2023-03-07
Publication date: 2023-07-14
Anticipated expiration: 2033-03-07

Abstract

The utility model provides a balanced traction transformer crisscross coil middle part rises layer insulation system, balanced traction transformer's inside is equipped with the inlayer coil, the skin of inlayer coil is equipped with outside coil, inlayer coil and the crisscross integral type of middle part of outer coil link to each other, be equipped with the inlayer cardboard between inlayer coil and the outer coil, the middle part of a side of inlayer cardboard be equipped with and rise layer opening, rise layer opening horizontal equidistant be equipped with two, the wall middle part between two rise layer openings is equipped with the fracture, rise layer open-ended outside and be equipped with the arc, the insulation of inlayer upper and lower part is reliable, convenient coiling, guarantees the potential difference insulation of inlayer middle part disconnection position reliably, the opening of middle part rise layer position can reliably protect.

Description

Middle lifting insulating structure of crossed coil of balance traction transformer

Technical Field

The utility model belongs to the technical field of wire continuous winding structures of balanced traction transformers, and particularly relates to a middle lifting insulating structure of a crossed coil of a balanced traction transformer.

Background

At present, the electrified railway adopts more traction transformers with V and V wiring, and the three phases of a power grid are seriously unbalanced due to the single-phase power supply load characteristic of the electrified railway, and the negative sequence component is very large. The YNV type balanced traction transformer can effectively eliminate third harmonic, the negative sequence voltage percentage is smaller, the influence on a power grid is smaller, and the traction transformer with V wiring has obvious advantages compared with a traction transformer with V wiring.

The windings of the low-voltage b-phase extension coils b3 and b4 of the 110KV grade YNV traction transformer are required to be wound in a crisscross manner, and the potential difference between the upper coil and the lower coil of the inner layer is more than 35KV; the potential difference between the inner layer and the outer layer coil is also more than 35KV; by researching the insulation structure of the middle lifting layer part of the inner layer and the outer layer, continuous winding is adopted, so that the reliable insulation of higher potential difference is ensured, and the production efficiency and the quality are improved;

the prior art is that the middle part crisscross part of the inner layer and the outer layer needs to be disconnected, the disconnection head is led out through copper sheet welding, the welding quantity is large, the copper sheet leading-out space is large, and the overall cost is high.

Disclosure of Invention

In order to solve the problem, the middle part of the crisscross coil of the balanced traction transformer is provided with the interlayer coil in an insulating structure, the inner layer coil is provided with the outer layer coil, the interlayer coil is connected with the middle part of the outer layer coil in a crisscross integrated manner, the interlayer coil is provided with the inner layer paperboard between the inner layer coil and the outer layer coil, the middle part of one side edge of the inner layer paperboard is provided with the interlayer opening, the interlayer openings are transversely and equidistantly provided with two, the middle part of a partition between the two interlayer openings is provided with a fracture, the outer side of the interlayer opening is provided with an arc plate, the upper part and the lower part of the inner layer are reliably insulated and conveniently wound, the potential difference insulation of the middle part of the inner layer and the outer layer is reliably ensured, and the notch of the middle part interlayer opening can be reliably protected.

The inner layer coil comprises b 1-b 10 coils and y 10-y 1 coils, the outer layer coil comprises b 20-b 2 coils and y 2-y 20 coils, the b10 head is connected with the b20 head through a whole line, the y10 head is connected with the y20 head through a whole line, the b 10-b 20 and the y 10-y 20 are crossed, soft angle rings are arranged at the positions of the b 10-b 20 head and the y 10-y 20 head, a plurality of cushion blocks are arranged between every two equidistant turns of the inner layer coil and the outer layer coil, the number of turns of the wire of the y 10-y 1 coil is 39 turns of wire, the number of turns of the wire of the y 2-y 20 coil is 39 turns of wire, the number of turns of the wire of the b 1-b 10 coil is 39 turns of wire, the number of turns of the wire of the b 20-b 2 coil is 39 turns of wire, the number of turns of the wire of the y 1-y 2 coil is 78 turns, and the number of turns of the wire of the b 1-b 2 coil is 78.

The inboard of inlayer coil is equipped with insulating inner tube, and the shape of inlayer cardboard is rectangular cardboard, and the setting of the horizontal curved circle of inlayer cardboard is between inlayer coil and outer coil, and the horizontal on-line of one side of inlayer cardboard is equipped with the layer opening that rises from top to bottom symmetry, layer opening that rises shape be vertical rectangle, layer open-ended outside surface links to each other with the arc, and this text both makes things convenient for the insulation of inlayer upper and lower part reliable, convenient coiling. The paper board between the inner layer and the outer layer is convenient to install and operate, the position of the coil after being pressed is convenient to change, and insulation reliability and position assurance can be guaranteed.

The shape of the arc plate is rectangular, the surface of the arc plate is transversely provided with a curved cambered surface, the radian of the arc plate is equal to that of the inner paperboard, one side of the transverse central line of the arc plate is provided with a U-shaped clamping groove, the U-shaped clamping groove is a through groove, the U-shaped clamping groove is transversely arranged on one side of the arc plate, the insulation reliability of the interlayer potential difference of the inner layer and the outer layer is ensured, and the notch of the middle lifting layer part can be reliably protected.

The beneficial effects are that:

the insulation of the upper and lower parts of the inner layer is convenient, reliable and convenient to wind. The paper board between the inner layer and the outer layer is convenient to install and operate, the position of the coil after being pressed is convenient to change, and insulation reliability and position assurance can be guaranteed.

The potential difference insulation reliability of the disconnection part in the middle of the inner layer and the outer layer is guaranteed, and the creepage distance of the stay of the inner layer and the stay of the outer layer meets the drawing requirement.

And the insulation reliability of the interlayer potential difference between the inner layer and the outer layer is ensured, and the defect of the middle layer lifting part can be reliably protected.

Drawings

FIG. 1 is a schematic diagram of the wiring structure of an inner layer coil of a middle lifting insulating structure of a crossed coil of a balanced traction transformer;

FIG. 2 is a schematic diagram of the outer layer coil wiring structure of the middle lifting layer insulation structure of the crossed coil of the balance traction transformer;

FIG. 3 is a schematic top-down wiring diagram of a middle lift insulation structure of a crossed coil of the balanced traction transformer;

FIG. 4 is a schematic diagram of a screen of a middle lift insulating structure of a crossed coil of a balanced traction transformer;

FIG. 5 is a schematic diagram of an arcuate plate of a middle boost insulating structure of a crossed coil of a balanced traction transformer;

FIG. 6 is a top view of an arcuate plate of a middle riser insulation structure of a crossed coil of the balanced traction transformer;

in the figure; 1. the inner layer coil, 2, the outer layer coil, 3, the insulating inner cylinder, 4, the interlayer paper board, 5, b10 head, 6, y10 head, 7, y20 head, 8, b20 head, 9, cushion block, 10, soft angle ring, 11 and layer lifting opening.

Detailed Description

In order to enhance the understanding of the present utility model, the present utility model will be further described in detail with reference to the following examples and drawings, which are provided for the purpose of illustrating the present utility model only and are not to be construed as limiting the scope of the present utility model.

An inner layer coil 1, an outer layer coil 2, an insulating inner cylinder 3, an interlayer paper board 4, a b10 head 5, a y10 head 6, a y20 head 7, a b20 head 8, a cushion block 9, a soft angle ring 10 and a lifting layer opening 11.

As shown in fig. 1, 2, 3, 4, 5, 6;

the middle lifting layer insulating structure of the crisscross coil of the balance traction transformer is characterized in that an inner layer coil 1 is arranged in the balance traction transformer, an outer layer coil is arranged on the outer layer of the inner layer coil 1, the inner layer coil 1 is connected with the middle lifting head of the outer layer coil 2 in a crisscross integrated manner, an inner layer paperboard is arranged between the inner layer coil 1 and the outer layer coil 2, lifting layer openings 11 are arranged in the middle of one side edge of the inner layer paperboard, two lifting layer openings 11 are transversely and equidistantly arranged, a fracture is arranged in the middle of a partition between the two lifting layer openings 11, arc plates are arranged on the outer side of the lifting layer openings 11, the inner layer coil 1 comprises b 1-b 10 coils and y 10-y 1 coils, the outer layer coil 2 comprises b 20-b 2 coils and y 2-y 20 coils, b10 head 5 is connected with the whole line of b20 head 8, y10 head 6 is connected with the whole line of y20 head 7, the two ends of the b 10-b 20 and the y 10-y 20 are crossed, soft angle rings 10 are arranged at the positions of the b 10-b 20 head 8 and the y 10-y 20 head 7, a plurality of cushion blocks 9 are arranged between every two equidistant turns of the inner layer coil 1 and the outer layer coil 2, the turns of the wires of the y 10-y 1 coil are 39 turns of wires, the turns of the wires of the y 2-y 20 coil are 39 turns of wires, the turns of the wires of the b 1-b 10 coil are 39 turns of wires, the turns of the wires of the b 20-b 2 coil are 39 turns of wires, the turns of the wires of the y 1-y 2 coil are 78 turns, the turns of the wires of the b 1-b 2 coil are 78 turns, the inner side of the inner layer coil 1 is provided with an insulating inner cylinder 3, the inner layer paperboard is rectangular paperboard, the inner layer paperboard is transversely bent and circularly arranged between the inner layer coil 1 and the outer layer coil 2, the transverse middle line of one side of the inner layer paperboard is provided with lifting layer openings 11 which are symmetrically arranged up and down, the shape of the lifting layer opening 11 is a vertical rectangle, the outer side surface of the lifting layer opening 11 is connected with an arc plate, the shape of the arc plate is rectangular, the surface of the arc plate is transversely provided with a curved cambered surface, the radian of the arc plate is equal to that of a layer of paperboard, one side of the transverse central line of the arc plate is provided with a U-shaped clamping groove, the U-shaped clamping groove is a through groove, and the U-shaped clamping groove is transversely arranged on one side of the arc plate.

Implementation examples;

the method comprises the steps of adopting a continuous wire lifting insulating structure, firstly winding y 10-y 1 coils (39 turns in total) at the lower part of an inner layer from bottom to top in a left winding direction (clockwise) on a host machine vertical winding machine, and shifting positions (see figure 1 for details) at 3-4 gears of the inner layer according to drawing requirements, and then completely winding 39 turns of wires of b 1-b 10 coils, namely, the y 10-y 11 coils at the lower part of the inner layer and the b 1-b 10 coils at the upper part of the inner layer.

The upper-most one turn of the coils at the lower parts y 1-y 10 of the inner layer and the lower-most one turn of the coils at the upper parts b 1-b 10 of the inner layer are respectively protected from inside to outside by using a 0.5mm insulating paperboard, and the soft angle ring 10 is protected from outside to inside by using a 0.5mm insulating paperboard.

The upper part b 1-b 10 coil of the inner layer and the lower part y 10-y 1 coil of the inner layer are prepared for lifting after insulation protection is carried out on the middle broken part, two pieces of 2.0mm T4 paper boards are placed between the inner layer coil 1 and the outer layer coil 2, and two reserved outlets are reserved on the interlayer paper boards 4 at the lifting part of the middle part; because the axial height in the coil winding process can not meet the axial height of the drawing under the condition of no axial pressure, the axial height is generally about 60-100 mm higher than the drawing height. The height of the head position of the middle lifting layer is about 50-70 mm higher than the drawing size; the gap of the interlayer insulating paper is at least 70mm higher than the actual head height.

Because the coil integrally contracts downwards after being axially pressed, the head position of the middle lifting layer moves downwards along with the coil, and the originally reserved outlet opening part does not meet the insulation requirement of normal operation, two arc plates with U-shaped clamping grooves are required to be additionally arranged, and the length dimension of the arc plates is smaller than the clearance distance in the gear by 5-10 mm; the height dimension of the arc-shaped plate is larger than the gap dimension of the interlayer insulating paper by more than 120 mm.

To ensure that two mutually clamped arc plates with U-shaped clamping grooves just protect the middle lifting layer wire reliably, the arc plates can also move downwards naturally along with the middle lifting layer wire along with the axial compression of the coil, and the arc plates can also reliably cover the gap of the interlayer insulating paper after the coil is pressed.

The uppermost one-turn wire of the coils at the lower parts b 2-b 20 of the outer layers and the lowermost one-turn wire of the coils at the upper parts y 20-y 2 of the outer layers are respectively protected from inside to outside by using 0.5mm insulating paper boards to manufacture soft angle rings 10, and then the soft angle rings 10 are protected from outside to inside by using 0.5mm insulating paper boards.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. Balance traction transformer cross coil middle part rises layer insulation system, balance traction transformer's inside is equipped with the inlayer coil, the skin of inlayer coil is equipped with outside coil, its characterized in that, inlayer coil and the crisscross integral type of outer coil's middle part head link to each other, be equipped with the inlayer cardboard between inlayer coil and the outer coil, the middle part of a side of inlayer cardboard be equipped with and rise layer opening, rise layer opening horizontal equidistant be equipped with two, the wall middle part between two rise layer openings is equipped with the fracture, rise layer open-ended outside to be equipped with the arc.

2. The middle lifting insulating structure of the crossed coil of the balanced traction transformer according to claim 1, wherein the inner layer coil comprises b 1-b 10 coils and y 10-y 1 coils, the outer layer coil comprises b 20-b 2 coils and y 2-y 20 coils, the b10 head is connected with the b20 head through a line, the y10 head is connected with the y20 head through a line, the b 10-b 20 and the y 10-y 20 are crossed, soft angle rings are arranged at the positions of the b 10-b 20 head and the y 10-y 20 head, and a plurality of cushion blocks are arranged between every circle of equidistant turns of the inner layer coil and the outer layer coil.

3. The middle lifting insulating structure of the crossed coil of the balanced traction transformer according to claim 2, wherein the number of turns of the wires of the y 10-y 1 coil is 39 turns of the wires, the number of turns of the wires of the y 2-y 20 coil is 39 turns of the wires, the number of turns of the wires of the b 1-b 10 coil is 39 turns of the wires, the number of turns of the wires of the b 20-b 2 coil is 39 turns of the wires, the number of turns of the wires of the y 1-y 2 coil is 78 turns, and the number of turns of the wires of the b 1-b 2 coil is 78 turns.

4. The middle lifting insulating structure of the crossed coil of the balanced traction transformer according to claim 1, wherein an insulating inner cylinder is arranged on the inner side of the inner coil.

5. The middle lifting layer insulating structure of the crisscross coil of the balanced traction transformer according to claim 1, wherein the inner paperboard is rectangular, the inner paperboard is transversely and circularly arranged between the inner coil and the outer coil, lifting layer openings are symmetrically arranged on the transverse middle line of one side of the inner paperboard up and down, the lifting layer openings are vertically rectangular, and the outer side surfaces of the lifting layer openings are connected with the arc plates.

6. The middle lifting insulating structure of the crossed coil of the balanced traction transformer according to claim 5, wherein the arc plate is rectangular in shape, the surface of the arc plate is transversely provided with a curved cambered surface, the radian of the arc plate is equal to that of the inner paperboard, one side of the transverse midline of the arc plate is provided with a U-shaped clamping groove, the U-shaped clamping groove is a through groove, and the U-shaped clamping groove is transversely arranged on one side of the arc plate.