WO2022082880A1

WO2022082880A1 - End insulation device for voltage regulation coil of oil-immersed power transformer

Info

Publication number: WO2022082880A1
Application number: PCT/CN2020/127410
Authority: WO
Inventors: 戴志强
Original assignee: 吴江变压器有限公司
Priority date: 2020-10-21
Filing date: 2020-11-09
Publication date: 2022-04-28
Also published as: CN112151248A

Abstract

An end insulation device for a voltage regulation coil of an oil-immersed power transformer, mounted on upper and lower ends of a voltage regulation coil (200), and comprising an insulating device body (100). The insulating device body (100) is cylindrical; several process through holes (101) are arranged on the surface of the insulating device body (100); the diameter of the process through holes (101) on the insulating device body (100) is 6-10 mm; the inner diameter of the voltage regulation coil is d, and the outer diameter of the voltage regulation coil is D; the number of support strips is n; the distance between every two process through holes (101) in the horizontal direction is 3.14*(d+D)/2n; the distance between every two process through holes (101) in the vertical direction is 100-140 mm; the shortest distance between the process through holes (101) and upper and lower sides of the insulating device body (100) is 50-100 mm. The process through holes (101) can increase the contact area of the insulation device body (100) during the oil immersion, so that the end insulation can be completely immersed. According to the mode of arranging the process holes by the pattern in the present solution, on the basis of not changing the functionality of the end insulation, the problems that the original end insulation structure cannot be immersed by the transformer oil, and gas is sealed in the insulation and cannot be discharged are solved.

Description

Oil-immersed power transformer voltage regulating coil end insulation device

technical field

The invention relates to a transformer component, in particular to an end insulating device for a voltage regulating coil of an oil-immersed power transformer.

Background technique

The upper and lower ends of the voltage regulating coil of the oil-immersed power transformer generally have end insulation. The end insulation is generally made of laminated insulating cardboard and is cylindrical. In the traditional structure, the end insulation is designed in a cylindrical shape and is installed on the upper and lower parts of the coil to fix, compress and increase the creepage distance of the coil. When the thickness of the voltage regulating coil is large, in order to ensure the effect of the end insulation, the thickness of the end insulation needs to be increased simultaneously. However, once the thickness of the end insulation is large, there is a situation where the transformer oil cannot fully penetrate the end insulation, the air existing in the end insulation cannot be separated out, and the gas is trapped in the end insulation, which increases the breakdown of the end insulation. The probability and the possibility of increased partial discharge during product operation have left hidden dangers for the stable operation of the product in the later stage.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to provide an end insulation device for the voltage regulating coil of an oil-immersed power transformer, which is improved for the situation that the original end insulation structure cannot be penetrated by transformer oil, and the gas pocket cannot be precipitated in the insulation.

The technical solution adopted by the present invention to solve the technical problem is as follows: an insulating device for the end of a voltage regulating coil of an oil-immersed power transformer, which is installed on the upper and lower ends of the voltage regulating coil, and includes an insulating device body; the insulating device body is in the form of a cylinder. A plurality of process through holes are formed on the surface of the insulating device body.

Further, the diameter of the process through hole on the insulating device body is 6-10 mm.

Further, the inner diameter of the voltage regulating coil is d, the outer diameter is D, the number of struts is n, and the distance between every two process through holes in the horizontal direction is 3.14*(d+D)/2n.

Further, the distance between every two process through holes in the vertical direction is 100-140 mm.

Further, the distance from the process through hole to the upper and lower sides of the insulating device body is at least 50-100 mm.

The beneficial effects of the present invention are: the process holes are added on the insulating device body of the present invention, which ensures that the insulating device body can be completely infiltrated by the transformer oil, and the insulating device body does not contain air, thereby ensuring the reliability of the insulating device body; The process holes are arranged according to a certain rule, which ensures that there is no air in the process holes and the reliability of the coil finished product.

Description of drawings

Fig. 1 is a schematic diagram of the body structure of an insulating device;

Figure 2 is a schematic diagram of the installation of the insulating device body.

Marked in the figure are: 100, the body of the insulating device; 101, the process through hole; 200, the voltage regulating coil; 210, the stay.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, which are only used to explain the present invention, and do not limit the protection scope of the present invention.

Example

As shown in FIG. 1 and FIG. 2 , the insulating device at the end of the voltage regulating coil of the oil-immersed power transformer is installed on the upper and lower ends of the voltage regulating coil 200, and includes the insulating device body 100; the insulating device body 100 is cylindrical; A plurality of process through holes 101 are formed on the surface of the insulating device body 100 . The increased process through holes 101 can increase the contact area of the insulating device body when it is immersed in oil, so that the end insulation can be completely saturated, and the reliability of the end insulation can be ensured.

On the above basis, the diameter of the process through hole 101 on the insulating device body 100 is 6-10mm; in this example, the diameter of the process through hole 101 is 8mm; the inner diameter of the voltage regulating coil 200 is d, the outer diameter is D, and the support The number of bars 210 is n, and the distance between every two process through holes 101 in the horizontal direction is 3.14*(d+D)/2n; the distance between every two process through holes 101 in the vertical direction is 100-140mm, in this example The spacing is 120mm; the distance from the process through hole 101 to the upper and lower sides of the insulating device body 100 is at least 50-100mm. According to the method of regularly arranging the process holes in this scheme, on the basis of not changing the insulation function of the end, the problem that the insulation structure of the original end cannot be penetrated by transformer oil and the gas pocket cannot be precipitated in the insulation is solved. It ensures the reliability of the end insulation and the reliability of the finished coil, which lays the groundwork for the stable operation of the product.

The above embodiments should not limit the present invention in any way, and all technical solutions obtained by means of equivalent replacement or equivalent conversion fall within the protection scope of the present invention.

Claims

An insulating device for the end of a voltage regulating coil of an oil-immersed power transformer, which is installed on the upper and lower ends of a voltage regulating coil (200), and is characterized in that: it comprises an insulating device body (100); and the insulating device body (100) is cylindrical A plurality of process through holes (101) are formed on the surface of the insulating device body (100).
The insulating device for the end of a voltage regulating coil of an oil-immersed power transformer according to claim 1, wherein the diameter of the process through hole (101) on the insulating device body (100) is 6-10 mm.
An insulating device for the end of a voltage regulating coil of an oil-immersed power transformer according to claim 1, characterized in that: the inner diameter of the voltage regulating coil (200) is d, the outer diameter is D, and the number of struts (210) is d. n, the distance between every two process vias (101) in the horizontal direction is 3.14*(d+D)/2n.
The insulating device for the end of a voltage regulating coil of an oil-immersed power transformer according to claim 1, characterized in that the distance between every two process through holes (101) in the vertical direction is 100-140 mm.
An oil-immersed power transformer voltage regulating coil end insulation device according to claim 1, characterized in that: the distance from the process through hole (101) to the upper and lower sides of the insulation device body (100) is at least 50- 100mm.