WO2022104641A1

WO2022104641A1 - High-efficiency distribution transformer

Info

Publication number: WO2022104641A1
Application number: PCT/CN2020/130089
Authority: WO
Inventors: 关银环; 薛建平; 周亮; 马健
Original assignee: 吴江变压器有限公司
Priority date: 2020-11-18
Filing date: 2020-11-19
Publication date: 2022-05-27
Also published as: CN112420347A

Abstract

The present invention relates to the technical field of transformer design and manufacturing. Disclosed is a high-efficiency distribution transformer, comprising an iron core. The iron core is made of a B20R060 silicon steel sheet; the high-voltage side and the low-voltage side of the iron core are each provided with a set of upper and lower clamping pieces; the upper and lower clamping pieces on the same side are tensioned by means of a pull screw rod; the two sets of upper clamping pieces are tensioned by means of a side pull screw rod; each upper clamping piece is made of laminated wood; a plurality of threaded holes are formed on the upper clamping piece; the threaded holes are used for fixing lead wires; L-shaped steel plates are embedded between the two upper clamping pieces; drawstring supporting plates are welded on the upper portions of the L-shaped steel plates; an epoxy glass adhesive tape is provided between the drawstring supporting plates; and the epoxy glass adhesive tape tensions the upper iron yoke of the transformer. The upper clamping piece uses a laminated wood structure, thereby being capable of improving the magnetic leakage distribution of the end portion of a winding, and reducing stray loss generated by a magnetic leakage flux passing through a steel structural piece.

Description

High-efficiency distribution transformers

technical field

The invention relates to a transformer, in particular to a high-efficiency distribution transformer.

Background technique

"GB20052-2020 - Power Transformer Energy Efficiency Limit Values and Energy Efficiency Grades" was released on May 29, 2020. Compared with the previous version of "GB20052-2013 - Three-phase Distribution Transformer Energy Efficiency Limit Values and Energy Efficiency Grades", for oil For submerged distribution transformers, in addition to the reduction of the standard values of Class 1 and Class 2 empty and load losses, the two capacities of 2000kVA and 2500kVA are included in the energy efficiency limit for the first time, that is, the empty and load losses follow the values stipulated in the standard, and there must be no positive In the traditional design, for the distribution transformer of this capacity section, the loss tolerance is usually +15% (empty and load loss), +10% as specified in "GB1094.1-2013 - Power Transformer" (total loss) control. At present, the silicon steel type high-efficiency distribution transformers produced in the industry are mostly made of B23R080 or B23R085 silicon steel sheets, and the unit iron loss is high. In order to ensure the no-load loss of the transformer, the core magnetic density is low, and the amount of copper and silicon steel sheets more. The traditionally designed clamps are usually of channel steel structure. The distance between the channel steel and the end of the coil is relatively short, and the leakage magnetic flux passes through the steel structure, which will generate a large amount of stray loss. In addition, the large current leads are in the surrounding steel structure. It will also produce large eddy current losses, which will affect the performance of the transformer.

SUMMARY OF THE INVENTION

The technical problem solved by the present invention is to provide a high-efficiency distribution transformer, which is developed based on high-efficiency, low-loss silicon steel and has high no-load performance.

The technical solution adopted by the present invention to solve the technical problem is as follows: a high-efficiency distribution transformer, including an iron core; a set of upper clips and a lower clip are respectively arranged on the high-voltage side and the low-voltage side of the iron core; the upper clip on the same side The two sets of upper clamps are tightened by a side screw; the upper clamps are made of laminated wood; the upper clamps are provided with a plurality of threaded holes ; the threaded hole is used for the fixing of the lead wire; an L-shaped steel plate is embedded between the two upper clips; the upper part of the L-shaped steel plate is welded with a pull-belt support plate; a ring is provided between the pull-belt support plates Oxygen glass adhesive tape; the epoxy glass adhesive tape tightens the iron yoke on the transformer.

Further, the iron core is made of B20R060 silicon steel sheet.

Further, the lower clamp is a channel steel structure, and is connected with the upper clamp through a pulling screw.

Further, two epoxy glass adhesive tapes are arranged between the two upper clips.

The beneficial effects of the invention are as follows: using high-efficiency and low-loss B20R060 silicon steel sheets to make the iron core, improving the design magnetic density, reducing the number of winding turns, controlling the basic resistance loss of the windings, and using less copper and silicon steel sheets. Compared with B23R080 silicon steel sheet), the material cost can be reduced by 10%; the upper clamp adopts laminated wood structure, which improves the magnetic leakage distribution at the winding end and reduces the stray loss caused by the leakage magnetic flux passing through the steel structure. The wooden clip has threaded holes for fixing the high and low voltage leads to reduce the eddy current loss caused by the leakage magnetic flux of the leads in the surrounding steel structures. Compared with the traditional channel steel structure, the load loss can be reduced by 3% to 4%; the L-shaped steel plate and the wooden clip are embedded in the structure, the upper part of the L-shaped steel plate is welded with a pull-belt support, and two epoxy glass adhesive tape , The side screw realizes the tension of the upper iron yoke, the structure is simple, and the processing is convenient. The lower clamp still adopts the channel steel structure, and the upper and lower clamps are tightened by pulling the screw to improve the support strength of the structure to the body.

Description of drawings

Figure 1 is a schematic diagram of the transformer structure;

FIG. 2 is a schematic diagram of the top view structure of the transformer.

Marked in the figure: 100, iron core; 110, lead wire; 200, upper clip; 201, side screw; 210, L-shaped steel plate; 220, drawstring support plate; 221, epoxy glass adhesive tape; 300, lower clip ; 310, pull the screw.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The embodiments 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 , a high-efficiency distribution transformer includes an iron core 100; a set of upper clips 200 and a lower clip 300 are respectively provided on the high-voltage side and the low-voltage side of the iron core 100; the upper clips on the same side The tension between the upper clamps 200 and the lower clamps 300 is carried out by the pull screw 310; the two sets of upper clamps 200 are pulled by the side screws 201; the upper clamps 200 are made of laminated wood to reduce the leakage of the leads 110. Eddy current loss generated in traditional steel structural parts; the upper clamp 200 is provided with a plurality of threaded holes; the threaded holes are used for fixing the lead 110; L-shaped steel plates are embedded between the two upper clamps 200 210; the upper part of the L-shaped steel plate 210 is welded with a pull tape support plate 220; an epoxy glass adhesive tape 221 is arranged between the pull tape support plates 220, and the epoxy glass adhesive tape 221 tightens the iron yoke on the transformer, There are two epoxy glass adhesive tapes 221 in this example.

On the above basis, the iron core 100 adopts B20R060 silicon steel sheet, which has low iron loss per unit and a designed magnetic density value of 1.6T, while the magnetic density value of the traditional design (using B23R080 silicon steel sheet) is generally below 1.5T. After the density increases, the number of winding turns is correspondingly reduced, which can effectively control the basic resistance loss of the winding. In this technical solution, the parameters in the shearing process of thin silicon steel are set as follows: Slitting: control the end jump of the cutter to be ≤0.015mm, the cutter gap to be controlled to 0.01-0.02mm, and the coincidence of the upper and lower cutters to be 0.18-0.2mm. When the strip is wound, the pressing force of the take-up device should be appropriately lowered to avoid the deformation of the iron core caused by excessive pressure; cross-cutting: the feeding guide rail should be appropriately 2-3mm wider than the material to prevent the material from being pulled too tightly. The key points and parameter settings of thin silicon steel shear control can control the shear quality, reduce the performance loss in the application of silicon steel sheets, and reduce the no-load loss and noise of the transformer.

On the basis of the above, the lower clamp 300 is a channel steel structure, and is connected to the upper clamp 200 by pulling the screw rod 310 .

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

A high-efficiency distribution transformer, comprising an iron core (100); a set of upper clips (200) and a lower clip (300) are respectively provided on the high-voltage side and the low-voltage side of the iron core (100); the upper clips on the same side The tension between (200) and the lower clamp (300) is tightened by the pulling screw (310); the two sets of upper clamps (200) are pulled by the side screw (201); it is characterized in that: the upper clamp The piece (200) is made of laminated wood; the upper clip (200) is provided with a plurality of threaded holes; the screw holes are used for fixing the lead (110); between the two upper clips (200) An L-shaped steel plate (210) is embedded; the upper part of the L-shaped steel plate (210) is welded with a pull-belt support plate (220); an epoxy glass adhesive tape (221) is arranged between the pull-belt support plates (220); .
A high-efficiency distribution transformer according to claim 1, characterized in that: the iron core (100) is made of B20R060 silicon steel sheet.
A high-efficiency distribution transformer according to claim 1, characterized in that: the lower clamp (300) is a channel steel structure, and is tensioned and connected to the upper clamp (200) by a pulling screw (310).
The high-efficiency distribution transformer according to claim 1, characterized in that: two epoxy glass adhesive tapes (221) are arranged between the two upper clips (200).