CN210956415U

CN210956415U - Insulation structure between end cakes of high-voltage coil of power transformer

Info

Publication number: CN210956415U
Application number: CN201922311174.0U
Authority: CN
Inventors: 陈玉国
Original assignee: Shandong Dachi Chixiang Electric Co ltd
Current assignee: Shandong Dachi Chixiang Electric Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-07-07
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses an insulation system between power transformer high voltage coil tip cake, including unshakable in one's determination, the outside unshakable in one's determination is equipped with low voltage coil, low voltage coil's the outside is equipped with high voltage coil, the first cake and the second cake of high voltage coil upper end are tip line cake A and tip line cake B respectively, be equipped with insulating part M and insulating part N between tip line cake A and the tip line cake B respectively. The transformer has compact insulation structure design, is simple and easy to operate, and is convenient and practical; the special insulating part is arranged close to the paper-covered wire, so that an oil gap between the special insulating part and the paper-covered wire is eliminated, the field intensity in oil is effectively reduced (the distance between an oil duct and the wire is increased), and the phenomenon that the insulating effect is influenced due to the fact that the field intensity is higher because of the possibly existing small oil gap is avoided. Meanwhile, the structure has lower cost, but actually enhances the insulation strength between the coil cakes at the end part of the high-voltage coil of the power transformer and improves the running reliability of the transformer.

Description

Insulation structure between end cakes of high-voltage coil of power transformer

Technical Field

The utility model relates to a transformer manufacturing technology field, concretely relates to insulation system between power transformer high-voltage coil tip cake.

Background

In addition to the short-term and long-term overvoltage during insulation test and actual operation, the high-voltage coil of the power transformer also bears continuous working voltage on the wire insulation, which is an important basis for determining the wire insulation. In general, it is practically impossible to obtain the same initial surge voltage between the end plates of the high-voltage coil with high voltage, and it is generally necessary to increase the thickness of the insulation of the conductor turns to obtain sufficient insulation strength, but there is a limit to increase the insulation of the conductor turns because increasing the insulation of the turns reduces the series capacitance of the coil, increases the temperature rise of the winding, and decreases the space factor of the winding, and also increases the cost.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides an insulation system between power transformer high tension coil tip cake.

The utility model discloses a realize through following technical scheme:

the utility model provides an insulation system between power transformer high voltage coil end cake, includes unshakable in one's determination, the outside of unshakable in one's determination is equipped with low voltage coil, low voltage coil's the outside is equipped with high voltage coil, the first cake and the second cake of high voltage coil upper end are tip line cake A and tip line cake B respectively, be equipped with insulating part M and insulating part N between tip line cake A and the tip line cake B respectively.

Preferably, the cross sections of the insulating pieces M and the insulating pieces N are L-shaped, so that the insulating effect is enhanced.

Preferably, the insulating part M and the insulating part N are made of a plurality of insulating papers, the insulating papers are soft and can be formed by adapting to the shape of a paper-covered wire, and the insulating parts which are integrated are placed on the inner diameter sides of two adjacent wire cakes at the end part of the coil and the adjacent surfaces of the two adjacent wire cakes to form an insulating structure between the cakes.

The beneficial effects of the utility model are embodied in: the transformer has compact insulation structure design, is simple and easy to operate, and is convenient and practical; the special insulating part is arranged close to the paper-covered wire, so that an oil gap between the special insulating part and the paper-covered wire is eliminated, the field intensity in oil is effectively reduced (the distance between an oil duct and the wire is increased), and the phenomenon that the insulating effect is influenced due to the fact that the field intensity is higher because of the possibly existing small oil gap is avoided. Meanwhile, the structure has lower cost, but actually enhances the insulation strength between the coil cakes at the end part of the high-voltage coil of the power transformer and improves the running reliability of the transformer.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic view of a main structure of a power transformer according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of an insulation structure between end cakes of the high voltage coil of "part I" in fig. 1.

In the figure, 1 iron core, 2 low-voltage coil, 3 end coil A, 4 insulating parts M, 5 high-voltage coil, 6 insulating parts N and 7 end coil B.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

For ease of description, spatially relative terms, such as "upper," "lower," "left," "right," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatial terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "lower" can encompass both an upper and a lower orientation.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

With reference to fig. 1, the insulation structure between the end cakes of the high-voltage coil of the power transformer of the embodiment includes an iron core 1, a low-voltage coil 2 is arranged on the outer side of the iron core 1, a high-voltage coil 5 is arranged on the outer side of the low-voltage coil 2, the first cake and the second cake at the upper end of the high-voltage coil 5 are an end cake A3 and an end cake B7, and an insulation member M4 and an insulation member N6 are arranged between the end cake A3 and the end cake B7.

In the embodiment, the cross sections of the insulating piece M4 and the insulating piece N6 are both L-shaped, so that the insulating effect is increased; the insulating piece M4 and the insulating piece N6 are made of a plurality of pieces of insulating paper, the insulating paper is soft and can be formed by adapting to the shape of the paper-covered wire, and the insulating pieces integrated with the adjacent surfaces of the two adjacent wire cakes on the inner diameter side of the two adjacent wire cakes at the end part of the coil form an insulating structure between the two wire cakes, so that oil gaps between the insulating pieces and the paper-covered wire are eliminated, and the insulating strength is further effectively enhanced.

The transformer coil inter-cake insulation structure of the transformer has compact design, is simple and easy to operate, and is convenient and practical; the special insulating part is arranged close to the paper-covered wire, so that an oil gap between the special insulating part and the paper-covered wire is eliminated, the field intensity in oil is effectively reduced (the distance between an oil duct and the wire is increased), and the phenomenon that the insulating effect is influenced due to the fact that the field intensity is higher because of the possibly existing smaller oil gap is avoided. Meanwhile, the structure has lower cost, but actually enhances the insulation strength between the coil cakes at the end part of the high-voltage coil of the power transformer and improves the running reliability of the transformer.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. The utility model provides an insulation system between power transformer high voltage coil end cake, includes unshakable in one's determination, the outside of unshakable in one's determination is equipped with low voltage coil, low voltage coil's the outside is equipped with high voltage coil, its characterized in that: the first cake and the second cake at the upper end part of the high-voltage coil are respectively an end part wire cake A and an end part wire cake B, and an insulating part M and an insulating part N are respectively arranged between the end part wire cake A and the end part wire cake B.

2. An insulation structure between end cakes of a high-voltage coil of a power transformer as claimed in claim 1, wherein: the cross sections of the insulating piece M and the insulating piece N are both L-shaped.

3. An insulation structure between end cakes of a high-voltage coil of a power transformer as claimed in claim 1, wherein: the insulating piece M and the insulating piece N are made of a plurality of insulating papers.