CN215342266U

CN215342266U - Insulation structure of oil-immersed distribution transformer

Info

Publication number: CN215342266U
Application number: CN202121407646.3U
Authority: CN
Inventors: 曾锦河; 吴伟义
Original assignee: Guangdong Purlux Electric Co ltd
Current assignee: Guangdong Purlux Electric Co ltd
Priority date: 2021-06-24
Filing date: 2021-06-24
Publication date: 2021-12-28
Anticipated expiration: 2031-06-24

Abstract

The utility model relates to the technical field of electrical equipment, in particular to an insulating structure of an oil-immersed distribution transformer, which comprises a layer of 0.15 mm-thick AMA insulating paper, a plurality of small oil duct supporting strips and an insulating thin paper plate, wherein the AMA insulating paper is wrapped on the outer surface of a low-voltage coil group, the small oil duct supporting strips are uniformly distributed on the outer surface of the AMA insulating paper, the insulating thin paper plate with the thickness of 0.5mm is wrapped on the outer surface of each small oil duct supporting strip to form a smooth arc surface, three layers of 0.15 mm-thick AMA insulating paper are wrapped on the outer surface of the insulating thin paper plate, the AMA insulating paper is formed by compounding and gluing three layers of insulating materials, the middle layer is a polyester film, and the upper layer and the lower layer are cable insulating paper. According to the utility model, the small oil duct stay, the insulating thin paperboard and the AMA insulating paper are used as main insulation, the thicker paperboard is replaced by the AMA insulating paper, the heat dissipation inside the coil is improved by the small oil duct stay, the consumption of the iron core and the copper wire is reduced on the premise of ensuring the electrical performance, the loss is reduced, the product cost is reduced, and the service life of the product is prolonged.

Description

Insulation structure of oil-immersed distribution transformer

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to an insulation structure of an oil-immersed distribution transformer.

Background

At present, one part of main insulation between high and low voltage coils of an oil immersed distribution transformer in China is an insulation structure adopting an oil duct and a paper board, the other part of the main insulation is an insulation structure adopting a corrugated oil duct and a paper board, the distance between the high and low voltage coils is large, and some coils are formed by a plurality of pieces of insulation paper, have no oil duct and have poor heat dissipation effect.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an insulating structure of an oil-immersed distribution transformer by optimizing an insulating structure, wherein a small oil duct stay, an insulating thin paper board and AMA insulating paper are used as main insulation, and a heat dissipation oil duct is arranged, so that the heat dissipation in a coil is improved, the distance between high and low voltage coils is reduced, the using amount of an iron core and a copper wire is reduced, the material cost is reduced, and the service life of a product is prolonged.

An insulation structure of an oil immersed distribution transformer comprises a layer of 0.15mm thick AMA insulation paper wrapped on the outer surface of a low-voltage coil group, a plurality of small oil duct supporting bars uniformly distributed on the outer surface of the AMA insulation paper, an insulation thin paper plate wrapped on the outer surface of each small oil duct supporting bar and having a thickness of 0.5mm to form a smooth arc surface, three layers of 0.15mm thick AMA insulation paper wrapped on the outer surface of the insulation thin paper plate, and a high-voltage coil group wrapped on the outer surface of each small oil duct supporting bar, wherein the number of the small oil duct supporting bars is not less than 4, and a gap is formed between every two small oil duct supporting bars; the AMA insulating paper is formed by gluing and compounding three layers of insulating materials, and the middle layer is a polyester film; the upper and lower layers are cable insulation paper.

As a further scheme of the utility model: a plurality of layers of end insulators are wrapped at two ends of the high-voltage coil group, and the width of the end insulator of the first layer and the second layer close to one end of the AMA insulating paper is 2mm wider than the width of other layers.

Compared with the prior art, the utility model has the beneficial effects that: through little oil duct stay with insulating cardboard and AMA insulating paper as main insulation to the AMA insulating paper replaces thicker cardboard, and little oil duct stay has improved the inside heat dissipation of coil, obtains under the prerequisite of guarantee at electrical property, makes iron core quantity and copper line reduce, reduces the loss, reduces product cost, extension product life.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

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 description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the present invention.

Fig. 2 is a cross-sectional view of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 and 2, in an embodiment of the present invention, an insulation structure of an oil-immersed distribution transformer includes a low-voltage coil assembly, a high-voltage coil assembly, and a plurality of small oil duct stays 2, after the low-voltage coil is wound, wrapping a layer of 0.15mm thick AMA insulating paper 1 on the outer surface of the low-voltage coil to make the electric field uniformly distributed, then uniformly distributing the small oil duct supporting bars 2 on the outer surface of the AMA insulating paper 1, wherein, the number of the small oil duct supporting strips 2 is not less than 4, and the gap is arranged between the two small oil duct supporting strips 2, which is convenient for oil to flow through and dissipate heat, a layer of insulating thin paper board 3 with the thickness of 0.5mm is wrapped on the outer surface of the small oil duct stay 2, so that a smooth arc is formed on the surface of the small oil duct stay 2 to ensure the smoothness of the oil duct, then, three layers of AMA insulating paper 1 with the thickness of 0.15mm are wrapped on the outer surface of the insulating thin paper board 3, and finally, the high-voltage coil group is wound. Through small oil duct stay 2 with insulating cardboard 3 and AMA insulating paper 1 as the main insulation to AMA insulating paper 1 replaces thicker cardboard, and small oil duct stay 2 has improved the inside heat dissipation of coil, obtains under the prerequisite of guaranteeing at electrical property, makes iron core quantity and copper line reduce, reduces the loss, reduces product cost, extension product life.

It should be noted that the number of the small oil passage struts 2 is not fixed, and may be determined according to the size of the low-voltage coil assembly, and the number of the small oil passage struts 2 may be 5, 6, or 10, and here, the number of the small oil passage struts 2 is not described in detail.

The AMA insulating paper 1 has good mechanical toughness, excellent electrical performance and good oil resistance, the AMA insulating paper 1 is formed by gluing and compounding three layers of insulating materials, and the middle layer is a polyester film; the upper and lower layers are cable insulation paper. The middle layer adopts a polyester film which has excellent mechanical property, high rigidity, hardness and toughness, puncture resistance, friction resistance, high temperature resistance, low temperature resistance, good chemical resistance and oil resistance; the upper and lower layers are made of cable insulation paper, the cable insulation paper has high tensile strength, folding strength and tearing strength, after being treated by insulating liquid, the cable insulation paper is good in stability, the service life of the oil-immersed distribution transformer is prolonged, and meanwhile the working efficiency of the oil-immersed distribution transformer is improved.

Further, because the distance between oil-immersed distribution transformer's low pressure coil group and the high-voltage coil group reduces, for guaranteeing oil-immersed distribution transformer's electrical insulation performance, it has a plurality of layers of end insulation 4 to wrap at high-voltage coil group both ends, and the width that end insulation 4 is close to the first second floor end insulation 4 of 1 one end of AMA insulating paper is than other layer width wide 2mm to increase creepage distance.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model 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. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. An insulation structure of an oil immersed distribution transformer comprises a layer of 0.15 mm-thick AMA insulation paper (1) wrapping the outer surface of a low-voltage coil group, a plurality of small oil duct supporting bars (2) uniformly distributed on the outer surface of the AMA insulation paper (1), and an insulation thin paper plate (3) wrapping the outer surface of the small oil duct supporting bars (2) and having a thickness of 0.5mm to form a smooth arc surface, and three layers of 0.15 mm-thick AMA insulation paper (1) wrapping the outer surface of the insulation thin paper plate (3) and then wrapping a high-voltage coil group, wherein the number of the small oil duct supporting bars (2) is not less than 4, a gap is formed between the two small oil duct supporting bars (2), the AMA insulation paper (1) is formed by compounding three layers of insulation materials through gluing, and the middle layer is a polyester film; the upper and lower layers are cable insulation paper.

2. Oil filled distribution transformer insulation structure according to claim 1, characterized in that several layers of end insulation (4) are wrapped around both ends of the high voltage coil assembly, and the width of the end insulation (4) of the first and second layers close to one end of the AMA insulation paper (1) is 2mm wider than the width of the other layers.