CN210200520U

CN210200520U - Winding interphase insulation structure adopting bent plate

Info

Publication number: CN210200520U
Application number: CN201921280069.9U
Authority: CN
Inventors: Bogen Chen; 陈伯根; Hang Chen; 陈航; Jinlong Ke; 柯金龙; Feng Cai; 蔡锋
Original assignee: Fuzhou Tianyu Electric Co Ltd
Current assignee: Fuzhou Tianyu Electric Co Ltd
Priority date: 2019-08-08
Filing date: 2019-08-08
Publication date: 2020-03-27
Anticipated expiration: 2029-08-08

Abstract

The utility model relates to an adopt transformer ware body winding alternate insulation system of bent plate, including being arranged in a pair of insulating bent plate between the adjacent two windings upper end in the transformer ware body, insulating bent plate is 90, and the horizontal portion orientation of two insulating bent plates between the adjacent two windings is opposite and takes respectively in the upper end of two windings, and the vertical position of insulating bent plate is in the interval between the adjacent two windings. The utility model discloses a transformer ware body winding phase-to-phase insulation structure of bent plate simple structure, low in manufacturing cost easily processes and assembles, under the condition that does not increase winding phase-to-phase distance, improves the alternate insulation level of winding, and winding phase-to-phase dielectric strength can bear huge voltage.

Description

Winding interphase insulation structure adopting bent plate

Technical Field

The utility model relates to an adopt transformer ware body winding interphase insulation structure of bent plate.

Background

According to new national standard requirements, an oil-immersed transformer with a voltage grade of 110kV and above needs to be subjected to an operation surge overvoltage test. In the test process, the winding phases need to bear huge voltage. In order to ensure the phase-to-phase insulation strength, the winding phase-to-phase distance can be simply enlarged, but the cost is increased.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a simple structure, the alternate insulation system of transformer ware body winding of adoption bent plate with low costs can effectively improve the alternate insulation level of winding.

The utility model discloses a following scheme realizes: the utility model provides an adopt transformer ware body winding interphase insulation structure of bent plate, includes a pair of insulating bent plate that is arranged in the transformer ware body between two adjacent winding upper ends, insulating bent plate is 90, and the horizontal portion orientation of two insulating bent plates between two adjacent windings is opposite and takes respectively in the upper end of two windings, and the vertical position of insulating bent plate is arranged in the interval between two adjacent windings.

Further, the insulating bent plate comprises an outer insulating paper plate and an inner insulating paper plate which are bent to 90 degrees, horizontal supporting strips which are arranged at intervals are clamped between the transverse part of the outer insulating paper plate and the transverse part of the inner insulating paper plate, and the horizontal supporting strips are perpendicular to the vertical part of the insulating bent plate; vertical supporting strips which are arranged at intervals are clamped between the vertical part of the outer insulating paperboard and the vertical part of the inner insulating paperboard, and the vertical supporting strips are perpendicular to the horizontal part of the insulating bent plate.

Furthermore, the 90-degree corners of the outer-layer insulating paper board and the inner-layer insulating paper board are in arc-shaped corner transition, and the thicknesses of the outer-layer insulating paper board and the inner-layer insulating paper board are both 2 mm; the width of the insulating bent plate is 115-130 mm, the height of the insulating bent plate is 195-210 mm, and the length of the insulating bent plate is 55-65 mm larger than the distance between the iron core clamping pieces on the two sides of the transformer body.

Furthermore, the thickness of each horizontal supporting strip and the thickness of each vertical supporting strip are both 4mm, the width of each horizontal supporting strip is 10mm, and the distance between each two adjacent horizontal supporting strips and the distance between each two adjacent vertical supporting strips are both 30 mm.

Furthermore, an arc-shaped groove is formed in the transverse portion of the insulating bent plate, the circle center of the arc-shaped groove is located on the central line of the winding, and the diameter of the arc-shaped groove is consistent with the inner diameter of the high-voltage winding on the winding.

Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses a transformer ware body winding phase-to-phase insulation structure of bent plate simple structure, low in manufacturing cost easily processes and assembles, under the condition that does not increase winding phase-to-phase distance, improves the alternate insulation level of winding, and winding phase-to-phase dielectric strength can bear huge voltage.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to specific embodiments and related drawings.

Drawings

Fig. 1 is a front view of an embodiment of the present invention;

FIG. 2 is a side view of an insulation bending plate according to an embodiment of the present invention;

FIG. 3 is a top view of an insulation bending plate according to an embodiment of the present invention;

FIG. 4 is a front view of an insulating bent plate according to an embodiment of the present invention;

the reference numbers in the figures illustrate: 100-winding, 200-insulating bent plate, 210-outer insulating paper plate, 220-inner insulating paper, 230-horizontal stay, 240-vertical stay and 250-arc groove.

Detailed Description

As shown in fig. 1 to 4, a transformer body winding interphase insulation structure using bent plates includes a pair of insulation bent plates 200 located between the upper ends of two adjacent windings 100 in a transformer body, the insulation bent plates are 90 °, the horizontal portions of the two insulation bent plates 200 between the two adjacent windings 100 face opposite directions and are respectively lapped on the upper ends of the two windings, and the vertical portions of the insulation bent plates 200 are located in the interval between the two adjacent windings; the body of a three-phase transformer needs 4 insulating bent plates, and the insulating bent plates are tightly pressed and fixed by a wood cushion block positioned between the upper end of a winding and an upper iron core clamping piece; according to the method, 90-degree bent plate insulation is added between the phases of the windings, so that the insulation level between the phases of the windings is improved under the condition that the phase distance of the windings is not increased, and the insulation strength between the phases of the windings can bear huge voltage; and the structure is simple, the manufacturing cost is low, and the processing and the assembly are easy.

In this embodiment, the insulating bent plate 200 includes an outer insulating paper board 210 and an inner insulating paper board 220 bent at 90 °, and the outer insulating paper board 210 and the inner insulating paper board 220 are formed by wet pressing and baking high-density paper boards with a thickness of 1 mm; horizontal supporting strips 230 which are arranged at intervals are clamped between the transverse part of the outer-layer insulating paperboard 210 and the transverse part of the inner-layer insulating paperboard 220, and the horizontal supporting strips 230 are vertical to the vertical part of the insulating bent plate; vertical supporting strips 240 which are arranged at intervals are clamped between the vertical part of the outer insulating paperboard and the vertical part of the inner insulating paperboard, and the vertical supporting strips 240 are perpendicular to the horizontal part of the insulating bent plate; the horizontal supporting strips and the vertical supporting strips are adhered between the outer-layer insulating paper board and the inner-layer insulating paper board by glue, so that transformer oil can be circulated and the inner and outer insulating paper boards can be supported.

In this embodiment, 90 corners between outer insulating board and the inlayer insulating board adopt the transition of arc bent angle, outer insulating board and inlayer insulating board's thickness are 2mm, and interior, outer insulating board all are by, and the arc bent angle department internal diameter of inlayer insulating board is 20mm, and the width W of insulating bent plate is 115~130mm, preferably 126mm, and height H is 195~210mm, preferably 206mm, and the length L of insulating bent plate is 55~65mm, preferably 60mm more than the interval between the iron core folder on the transformer ware body both sides.

In this embodiment, the thickness and the width of each of the horizontal stays and the vertical stays are both 4mm and 10mm, the distance between each two adjacent horizontal stays and each two adjacent vertical stays is 30mm, one end of each horizontal stay is flush with the edge of the transverse part of the insulating bent plate facing one side of the core column, and the other end of each horizontal stay is close to the arc-shaped bent angle; the lower ends of the vertical supporting strips are flush with the lower edge of the vertical part of the insulating bent plate, the upper ends of the vertical supporting strips are close to the arc-shaped bent angle, and the specific number of the supporting strips is determined according to the length of the insulating bent plate.

In this embodiment, the transverse portion of the insulating bent plate is provided with an arc-shaped groove 250, the center of the arc-shaped groove is located on the central line of the winding, and the diameter of the arc-shaped groove is consistent with the inner diameter of the high-voltage winding on the winding; so that the arc of the arc-shaped slot can be aligned with the inner circle of the high voltage winding on the winding.

This application insulation system's characteristics: (1) the structure of the inner and outer layers of insulating paper boards and the middle oil duct is adopted, so that the space between the windings can be effectively divided, and the electrical strength of the oiled paper insulation in unit length is improved; (2) the radius of the enlarged arc-shaped bend angle can be close to the equipotential line of the electric field intensity, so that the slide flash discharge along the surface of the paperboard is avoided; (3) a bent plate is arranged at the upper ends of the windings on two sides of the phase to insulate, so that the electric strength of the phase insulation can be effectively improved, the phase insulation distance is shortened, and the cost of the transformer is reduced.

Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.

The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.

The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims

1. The utility model provides an adopt transformer ware body winding interphase insulation structure of bent plate which characterized in that: the transformer comprises a pair of insulating bent plates positioned between the upper ends of two adjacent windings in a transformer body, wherein the insulating bent plates are 90 degrees, the transverse parts of the two insulating bent plates between the two adjacent windings face to each other in opposite directions and are respectively lapped at the upper ends of the two windings, and the vertical parts of the insulating bent plates are positioned in the interval between the two adjacent windings.

2. The transformer body winding interphase insulating structure using the bent plate according to claim 1, characterized in that: the insulating bent plate comprises an outer insulating paper plate and an inner insulating paper plate which are bent to 90 degrees, horizontal supporting strips which are arranged at intervals are clamped between the transverse part of the outer insulating paper plate and the transverse part of the inner insulating paper plate, and the horizontal supporting strips are perpendicular to the vertical part of the insulating bent plate; vertical supporting strips which are arranged at intervals are clamped between the vertical part of the outer insulating paperboard and the vertical part of the inner insulating paperboard, and the vertical supporting strips are perpendicular to the horizontal part of the insulating bent plate.

3. The transformer body winding interphase insulating structure using the bent plate according to claim 2, characterized in that: the 90-degree corners of the outer-layer insulating paper board and the inner-layer insulating paper board are in arc-shaped corner transition, and the thickness of each of the outer-layer insulating paper board and the inner-layer insulating paper board is 2 mm; the width of the insulating bent plate is 115-130 mm, the height of the insulating bent plate is 195-210 mm, and the length of the insulating bent plate is 55-65 mm larger than the distance between the iron core clamping pieces on the two sides of the transformer body.

4. The transformer body winding interphase insulating structure using the bent plate according to claim 3, characterized in that: the thickness of each horizontal supporting strip and the thickness of each vertical supporting strip are both 4mm, the width of each horizontal supporting strip is 10mm, and the distance between each two adjacent horizontal supporting strips and the distance between each two adjacent vertical supporting strips are both 30 mm.

5. The transformer body winding interphase insulating structure using the bent plate according to claim 1, characterized in that: the transverse part of the insulating bent plate is provided with an arc-shaped groove, the circle center of the arc-shaped groove is positioned on the central line of the winding, and the diameter of the arc-shaped groove is consistent with the inner diameter of the high-voltage winding on the winding.