CN202523535U - Body structure of 66kV level rectifier transformer - Google Patents

Abstract

The body structure of a 66kV class rectifier transformer designed by the utility model solves the technical problem that the body structure of the existing 35kV class rectifier transformer often cannot meet the use requirements of the current 66kV class DC traction line. The utility model comprises a hollow shell, and the shell is equipped with a high-voltage coil with iron yoke insulation, a high-voltage coil head, a high-voltage coil end and a high-voltage end ring, and a low-voltage coil head, a low-voltage coil end and a low-voltage end ring. The low-voltage coil is characterized in that the low-voltage coil is set outside the high-voltage coil, and an electrostatic ring is provided between the head end of the high-voltage coil, the end of the high-voltage coil and the high-voltage end coil. The electric field at the end of the high-voltage coil of the utility model is evenly distributed; the creepage distance of the high-voltage coil is large; the insulation strength is reliable;

Description

Body Structure of a 66kV Class Rectifier Transformer

technical field

The utility model relates to the technical field of rectifier transformer manufacturing, in particular to a body structure of a 66kV rectifier transformer.

Background technique

The rectifier transformer is used as the power transformer of the rectifier device. Its function is to provide AC power to the rectifier, and the rectifier converts the AC power into DC power to provide DC power supply. It is mainly used in metallurgy, chemical industry, locomotive traction and transmission and other industries. At present, most of the rectifier transformers used in China are of voltage level of 35kV and below, and the line loss of rectifier transformers of voltage level of 35kV and below is large and the operation cost is high. With the rapid development of my country's modern industrialization, power grid transformation, and voltage increase, 66kV rectifier transformers have emerged as the times require. However, the existing 35kV rectifier transformer body structure often cannot meet the current 66kV DC traction line requirements.

Utility model content

The purpose of this utility model is to provide a body structure of a 66kV rectifier transformer that can meet the requirements of the DC traction line in order to solve the above-mentioned deficiencies in the prior art.

In order to achieve the above purpose, the body structure of a 66kV rectifier transformer designed by the utility model includes a hollow shell, and the shell is equipped with an iron yoke insulation, a high-voltage coil head end, a high-voltage coil end and a high-voltage coil. The high-voltage coil of the end coil and the low-voltage coil with the head of the low-voltage coil, the end of the low-voltage coil and the end of the low-voltage coil are characterized in that the low-voltage coil is sleeved outside the high-voltage coil, and the first end of the high-voltage coil, the end of the high-voltage coil and the high-voltage end coil Electrostatic rings are arranged between them, and an angle ring is symmetrically arranged between the head end of the high-voltage coil and the end of the high-voltage coil and the iron yoke insulation, and the head end of the low-voltage coil and the end of the low-voltage coil are also symmetrically arranged between the iron yoke insulation. corner ring. The electrostatic ring can reduce the electric field intensity on the metal surface, reduce the maximum value of the electric field intensity at both ends of the high-voltage coil, and uniformly distribute the electric field at the end; the creepage distance of the high-voltage coil is large; it can meet the current requirements for the use of DC traction lines and the low-voltage coil is easy to go out. Installation saves time and effort.

As a further improvement and supplement to the above structure, the utility model also includes the following additional technical features or any combination of these features:

The upper end of the casing is provided with a pressing plate with pressing nails, which makes the body axially tight and tight, and can improve the short-circuit resistance of the transformer body.

Both the head end of the high voltage coil and the end of the high voltage coil are tangled winding, and the middle section of the high voltage coil is wound continuously, so the winding is reliable and the operation effect is good.

The low-voltage coil is wound in a double-cake manner, that is, the star-connected coil and the delta-connected coil are staggered and wound together. The winding is reliable and the operation effect is good.

There is a large oil gap between the high-voltage coil and the low-voltage coil, leaving enough safe insulation distance, and the insulation strength is reliable.

The body structure of a 66kV rectifier transformer obtained by the utility model has uniform distribution of the electric field at the end of the high-voltage coil; large creepage distance of the high-voltage coil; reliable insulation strength; strong overload and short-circuit resistance ability, which can meet the requirements of the current DC traction line The use requirements and the low-voltage coil outlet are convenient, and the installation saves time and effort.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1-high-voltage coil, 2-low-voltage coil, 3-head end of high-voltage coil, 4-end of high-voltage coil, 5-head of tap section, 6-high-voltage end coil, 7-electrostatic ring, 8-iron yoke insulation, 9-angle ring, 10-high voltage coil axial outlet, 11-low voltage star radial outlet, 12-low voltage angle radial outlet, 13-press nail, 14-press plate, 15-core, 16-large oil gap.

Detailed ways

Below by embodiment in conjunction with accompanying drawing, the utility model is further described.

As shown in Figure 1, the body structure of a 66kV rectifier transformer described in this embodiment includes a hollow shell, and the shell is equipped with an iron yoke insulation 8, a high-voltage coil head 3, and a high-voltage coil end. 4 and the high-voltage coil 1 of the high-voltage end coil 6 and the low-voltage coil 2 with the head end of the low-voltage coil, the end of the low-voltage coil and the low-voltage end coil. An electrostatic ring 7 is provided between the coil head 3, the high-voltage coil end 4 and the high-voltage end coil 6. The purpose is to reduce the electric field intensity on the metal surface of the electrostatic ring, reduce the maximum value of the electric field intensity at both ends of the high-voltage coil, and uniformly end the electric field. distributed. An angle ring 9 is symmetrically arranged between the high-voltage coil head end 3 and the high-voltage coil end 4 and the iron yoke insulation 8 respectively, and an angle ring is also symmetrically arranged between the low-voltage coil head end and the low-voltage coil end and the iron yoke insulation respectively, which can Increase the creepage distance of the high voltage coil.

The upper end of the housing is provided with a pressing plate 14 with pressing nails 13, and the body is pressed by spring pressing nails 13. The pressing plate 14 is made of laminated cardboard with a certain thickness, so that the axial direction of the body is tight and tight, and the body of the transformer can be improved. short-circuit resistance capability. Both the head end 3 of the high-voltage coil and the end 4 of the high-voltage coil are wound in a tangled manner, the middle section of the high-voltage coil 1 is wound in a continuous manner, and the low-voltage coil 2 is wound in a double-cake manner. The winding means that the star-connected coils and the delta-connected coils are staggered and wound together, as shown in Figure 1, 5 is the head of the tap section, 10 is the axial outlet of the high-voltage coil, 11 is the radial outlet of the low-voltage star connection, and 12 is the low-voltage angle Connect to the outgoing line. The casing is also provided with an iron core 15, and there are large oil gaps 16 between the iron core 15 and the high-voltage coil 1 and between the high-voltage coil 1 and the low-voltage coil 2, ensuring a sufficient safe insulation distance.

Claims (5)

1. the machine body structure of a 66kV level rectifier transformer; Comprise hollow housing; The high-tension coil (1) of band core insulation (8), high-tension coil head end (3), high-tension coil terminal (4) and high-pressure side circle (6) and the low-voltage coil (2) of band low-voltage coil head end, low-voltage coil end and low-pressure end circle are housed in the described housing; It is characterized in that described low-voltage coil (2) is enclosed within high-tension coil (1) outside; Between high-tension coil head end (3), high-tension coil terminal (4) and high-pressure side circle (6), be equipped with electrostatic ring (7); Said high-tension coil head end (3), high-tension coil terminal (4) respectively and be symmetrical set a square ring (9) between the core insulation (8), said low-voltage coil head end, low-voltage coil end are respectively and also be symmetrical set a square ring between the core insulation.

2. the machine body structure of 66kV level rectifier transformer according to claim 1 is characterized in that described housing upper end is provided with the pressing plate (14) that band is pressed nail (13).

3. the machine body structure of 66kV level rectifier transformer according to claim 1 and 2 is characterized in that described high-tension coil head end (3) and high-tension coil terminal (4) all adopt to be entangled with the formula coiling, the coiling of high-tension coil (1) interlude employing continous way.

4. the machine body structure of 66kV level rectifier transformer according to claim 1 and 2 is characterized in that described low-voltage coil (2) adopts two cake formula coilings, and the coiling of described pair of cake formula is the common coiling that is staggered of star wiring circle and corner connection coil.

5. the machine body structure of 66kV level rectifier transformer according to claim 1 and 2 is characterized in that leaving big oil clearance (16) between described high-tension coil (1) and the low-voltage coil (2).

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