CN113284722A

CN113284722A - Supporting structure for improving radial short-circuit resistance of transformer

Info

Publication number: CN113284722A
Application number: CN202110546711.9A
Authority: CN
Inventors: 邹德旭; 颜冰; 王山; 代维菊; 洪志湖; 钱国超; 周仿荣; 程志万; 彭庆军; 朱家良; 王浩州
Original assignee: Electric Power Research Institute of Yunnan Power Grid Co Ltd
Current assignee: Electric Power Research Institute of Yunnan Power Grid Co Ltd
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2021-08-20
Anticipated expiration: 2041-05-19
Also published as: CN113284722B

Abstract

The application provides a supporting structure for improving the radial short-circuit resistance of a transformer, which comprises an iron core window, a winding and a stay bar; wherein, the iron core window includes the iron core post, the winding includes a plurality of coil, a plurality of the coil housing is in form the multilayer annular structure who uses the iron core post as the center on the iron core post, adjacent two form the oil duct between the coil, a plurality of the stay is in around the setting of the unequal interval of iron core post in the oil duct, just the stay is insulating material. The application provides a supporting structure who improves transformer radial short circuit resistance can play good improvement effect to preventing that the transformer from taking place radial bending deformation in the winding under the short circuit strikes, has improved the radial short circuit resistance ability of transformer.

Description

Supporting structure for improving radial short-circuit resistance of transformer

Technical Field

The application relates to the technical field of transformers, in particular to a supporting structure for improving the radial short-circuit resistance of a transformer.

Background

A transformer is a stationary electrical device used to transform ac voltage, current and transmit ac power. The magnetic field induction type magnetic resonance transformer consists of two or more coil windings wound on the same iron core, wherein the windings are connected through an alternating magnetic field and work according to the electromagnetic induction principle. The transformer is the core of the whole power system, and if a fault occurs, the normal operation of the whole power system is affected, so how to perfect the transformer and reduce the occurrence frequency of short-circuit faults is always a research hotspot in the technical field of transformers.

At present, a method for improving the short-circuit resistance of a transformer is to adopt a compression measure at the end part of a coil, but the method can only improve the short-circuit resistance of the transformer in the axial direction and cannot improve the short-circuit resistance of the transformer in the radial direction.

Disclosure of Invention

The application provides an improve bearing structure of transformer radial anti short circuit ability to improve the anti short circuit ability of transformer in radial direction.

The application provides a supporting structure for improving the radial short-circuit resistance of a transformer, which comprises an iron core window, a winding and a stay bar;

the iron core window comprises an iron core column, the winding comprises a plurality of coils, the coils are sleeved on the iron core column to form a multi-layer annular structure with the iron core column as the center, an oil passage is formed between every two adjacent coils, and the supporting strips are arranged in the oil passage.

Optionally, a plurality of the stays disposed in the oil passage are distributed around the core limb.

Optionally, the plurality of supporting strips distributed around the core limb are distributed at unequal intervals.

Optionally, a closed area is formed in the core window, and the shorter the distance between the stay closer to the closed area and the adjacent stay is, the longer the distance between the stay farther from the closed area and the adjacent stay is.

Optionally, the stay is made of an insulating material.

According to the technical scheme, the supporting structure for improving the radial short-circuit resistance of the transformer comprises an iron core window, a winding and a supporting strip; wherein, the iron core window includes the iron core post, the winding includes a plurality of coil, a plurality of the coil housing is in form the multilayer annular structure who uses the iron core post as the center on the iron core post, adjacent two form the oil duct between the coil, a plurality of the stay is in around the setting of the unequal interval of iron core post in the oil duct, just the stay is insulating material. The application provides a supporting structure who improves transformer radial short circuit resistance can play good improvement effect to preventing that the transformer from taking place radial bending deformation in the winding under the short circuit strikes, has improved the radial short circuit resistance ability of transformer.

Drawings

In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a supporting structure for improving the radial short-circuit resistance of a transformer according to the present invention;

fig. 2 is a schematic cross-sectional structure diagram of the strut distribution of the present application.

Detailed Description

Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.

Under the current big development background of national power grid construction, the technical development of electrical equipment gradually approaches to maturity. The transformer is an important electrical device in the power system, and in order to ensure the safe and stable operation of the power system, the requirement on the failure rate of the transformer in the electrical industry is more and more strict.

The transformer short-circuit fault is one of the faults which are easy to occur in electrical accidents, so that the improvement of the short-circuit resistance of the transformer is always the hot field of the research of experts and scholars in the transformer industry, the radial stability of a transformer winding is an important part influencing the short-circuit resistance of the transformer, and the improvement of the radial stability of the transformer has important significance for the improvement of the short-circuit resistance of the transformer.

Referring to fig. 1, a schematic diagram of a supporting structure for improving radial short-circuit resistance of a transformer according to the present application is shown. As shown in fig. 1, the support structure for improving radial short-circuit resistance of a transformer provided by the present application includes an iron core window 1, a winding 2, and a supporting strip 3.

Iron core window 1 includes iron core column 11 and spliced pole, two and more than two 11 parallel arrangement of iron core column, the spliced pole is connected adjacent two 11, every two adjacent 11 with the connection of iron core column all form closed region 12 between the spliced pole of two adjacent iron core columns 11.

The winding 2 comprises a plurality of coils 21, the plurality of coils 21 are sleeved on the iron core column 11 to form a multi-layer annular structure taking the iron core column 11 as the center, the coils 21 all penetrate through the closed area 12, an oil passage 22 is formed between every two adjacent coils 21, and the supporting strips 3 are arranged in the oil passage 22.

It should be noted that the stays 3 are made of an insulating material, and a plurality of the stays 3 disposed in the oil passage 22 are distributed around the core limb 11.

Fig. 2 is a schematic cross-sectional structure diagram of the strut distribution of the present application. As can be seen from fig. 2, the plurality of stays 3 distributed around the core limb 11 are distributed at unequal intervals.

More specifically, in the oil passage 22, the closer to the closed region 12, the more densely the struts 3 are distributed, and the farther from the closed region 12, the more sparsely the struts 3 are distributed. That is, the shorter the distance between a stay 3 closer to the closed region 12 and its adjacent stay 3 is, the longer the distance between a stay 3 farther from the closed region 12 and its adjacent stay 3 is.

According to the technical scheme, the supporting structure for improving the radial short-circuit resistance of the transformer comprises an iron core window 1, a winding 2 and a supporting strip 3; wherein, iron core window 1 includes iron core post 11, winding 2 includes a plurality of coil 21, a plurality of coil 21 cover form on the iron core post 11 and use iron core post 11 as the multilayer annular structure at center, adjacent two form the oil duct 22 between the coil 21, a plurality of stay 3 is in around the setting of the unequal interval of iron core post 11 in the oil duct 22, just stay 3 is insulating material. The application provides a supporting structure who improves transformer radial short circuit resistance can play good improvement effect to preventing that the transformer from taking place radial bending deformation in the winding under the short circuit strikes, has improved the radial short circuit resistance ability of transformer.

While there have been shown and described what are at present considered the fundamental principles and essential features of the application, and advantages thereof, it will be apparent to those skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments, but is capable of other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.

Claims

1. A supporting structure for improving the radial short-circuit resistance of a transformer is characterized by comprising an iron core window (1), a winding (2) and a stay (3);

wherein, iron core window (1) includes iron core post (11), winding (2) include a plurality of coil (21), a plurality of coil (21) cover form on iron core post (11) and use iron core post (11) as the multilayer annular structure at center, adjacent two form oil duct (22), a plurality of stay (3) set up in oil duct (22).

2. The support structure for improving the radial short-circuit resistance of a transformer according to claim 1, wherein a plurality of said stays (3) disposed in said oil passage (22) are distributed around the core limb (11).

3. The supporting structure for improving the radial short-circuit resistance of the transformer according to claim 2, wherein a plurality of the supporting strips (3) distributed around the core limb (11) are distributed at unequal intervals.

4. The supporting structure for improving the radial short-circuit resistance of the transformer according to claim 3, wherein the core window (1) forms a closed area (12), the shorter the distance between the brace (3) closer to the closed area (12) and the adjacent brace (3) is, the longer the distance between the brace (3) farther from the closed area (12) and the adjacent brace (3) is.

5. The supporting structure for improving the radial short-circuit resistance of the transformer according to claim 4, wherein the supporting bars (3) are made of insulating materials.