Anti-short-circuit structure of new energy transformer

Abstract

The utility model discloses an anti-short-circuit structure of a new energy transformer, which comprises a transformer iron core, an oval low-voltage coil, a non-segmented oval high-voltage coil, an end insulator, a pressing plate and a paperboard I covering outside a low-voltage coil leading-out copper bar to improve the short-circuit protection capability, and a main channel oil channel is arranged between the low-voltage coil and the high-voltage coil. The main channel oil duct is divided into an inner side oil duct and an outer side oil duct by three layers of rhombus gluing insulation paper, and the end part of the outer side oil duct is inserted into a small angle ring; end insulators are arranged at the ends of the low-voltage coil and the high-voltage coil, pressing plates for body insulation are connected to the outer sides of the end insulators in a pressed mode, and cushion blocks are fixedly arranged on one sides of the pressing plates, compared with a traditional transformer anti-short-circuit structure, the cross section of the whole winding coil is of an oval structure, and a short-circuit test can be passed under the condition that the cross section is not changed; the high-voltage coil adopts a non-segmented structure, so that the use of insulating parts is reduced, and the production efficiency is improved; a traditional insulation end ring component is removed, and the insulation structure of the high-voltage coil is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to the body insulation structure technical field of power transformer especially relates to new energy transformer anti short circuit structure. BACKGROUND

[0002] The body of the transformer is the main part of the transformer, which determines the product performance and design cost of the transformer. The high and low voltage coils convert alternating voltage through Faraday's electromagnetic induction principle. The core is the "skeleton", which plays a supporting and fastening role and a magnetic field passage, and the coil is the electric passage, which is the input and output of the transformer. The body insulation is related to the insulation short circuit performance of the transformer.

[0003] The traditional 35kV oil immersed transformer mainly has the following disadvantages: whether the anti short circuit relates to the cross section of the transformer coil, the non anti short circuit generally adopts an oval structure, and the anti short circuit adopts a circular structure. Compared with the oval structure, the circular structure has higher production cost under the same parameters, and a new mold needs to be made. There are many insulation parts, and multiple insulation end rings need to be arranged outside the end part of the coil. The structure is complex. The traditional high voltage coil adopts a segmented structure of two parts, and the end insulation and the insulation end ring are used to separate the two parts. This structure cannot be applied to the automatic production of the automatic winding machine. The traditional high voltage coil end part increases the angle ring structure covering the entire radial dimension of the coil. The angle ring uses more materials and has low material utilization. UTILITY MODEL CONTENT

[0004] In order to solve the above technical problems, the utility model provides a new energy transformer anti short circuit structure, which has simple and compact structure, does not change the original mold cross section, simplifies the high voltage coil structure, reduces the number of insulation parts, and can realize anti short circuit prototype without separate design, and reduces the cost.

[0005] In order to achieve the above purposes, the utility model adopts the following technical scheme:

[0006] A new energy transformer anti short circuit structure, which comprises a transformer core, an oval low voltage coil, a non segmented oval high voltage coil, an end insulation, a pressing plate,

[0007] The low voltage coil leads out the copper bar outside the paperboard I, improves the short circuit protection ability, and the main channel oil channel is arranged between the low voltage coil and the high voltage coil. The main channel oil channel is divided into an inner oil channel and an outer oil channel by three layers of diamond shaped glue insulation paper. The outer oil channel end part is inserted into a small angle ring. The end part of the low voltage coil and the high voltage coil is provided with an end insulation. The outer side of the end insulation is pressed with a body insulation pressing plate. The pressing plate is fixedly provided with a pad on one side.

[0008] The paperboard I is arranged on the front and rear of the lead-out copper bar, and a supporting strip is inserted between the diamond-shaped glued insulation paper to support the gap as an oil channel, and the thickness of the paperboard I is 0.5 mm.

[0009] The angle ring is L-shaped paperboard, which is made of four 0.5 mm paperboards and is uniformly arranged above the outer oil channel, one end of the paperboard is inserted into the outer oil channel, and the other end of the paperboard covers the radial dimension of the high-voltage coil, and the high-voltage coil oil channel is not shielded.

[0010] Compared with the end insulation of a traditional transformer, the end insulation of the high-voltage coil is thickened to ensure the insulation distance, and the thickness dimension is changed to 33 mm.

[0011] The interlayer insulation of the high-voltage coil adopts hierarchical insulation.

[0012] The pressing plate is made of 40 mm thick laminated wood, the pressing plate is divided into six components above and below the coil, the pressing plate components are staggered and pressed tightly, the axial pressing force is uniformly distributed, a 7 mm thick laminated wood pad is pasted below the pressing plate (between the pressing plate and the end insulation), the width of the pad is 50 mm, the length of the pad is the radial dimension of the high-voltage coil, the pad transmits the pressing force in the axial direction, and the gap between the pads serves as an oil flow channel of the transformer, so that the transformer oil in the high-voltage coil oil channel flows smoothly, and the pressing plate is laid on the upper and lower ends of the coil.

[0013] The 1 mm thick paperboard II is arranged between the upper and lower yokes of the core and the coil pressing plate as an insulation guard plate.

[0014] The utility model has the following beneficial effects: the entire winding coil cross section adopts an oval structure, the short circuit test can be passed without changing the cross section; the high-voltage coil adopts a non-segmented structure, the use of insulation parts is reduced, and the production efficiency is improved; the traditional insulation end ring component is removed, the high-voltage coil insulation structure is simplified; an oil channel is reserved below the body pressing plate, and the coil axial pressing and oil flow are considered. BRIEF DESCRIPTION OF DRAWINGS

[0015] Fig. 1 It is a high and low voltage coil structure schematic view of the new energy transformer anti short circuit structure of the utility model;

[0016] Fig. 2 It is a body pressing plate structure schematic view of the new energy transformer anti short circuit structure of the utility model;

[0017] Fig. 3 It is a body insulation structure schematic view of the new energy transformer anti short circuit structure of the utility model.

[0018] 1. low voltage coil, 2. high voltage coil, 3. pressing plate, 4. diamond-shaped glued insulation paper, 5. inner oil channel, 6. outer oil channel, 7. high voltage coil oil channel, 8. small angle ring, 9. high voltage coil end insulation, 10. cushion block, 11. paperboard I, 12. paperboard II, 13. low voltage coil end insulation. DETAILED DESCRIPTION

[0019] The technical scheme of the utility model is described in further detail below with reference to the drawings and examples.

[0020] As Figs. 1-3 shown in the drawings, the utility model provides a new energy transformer anti-short circuit structure, which comprises a transformer core, an oval low voltage coil 1, a non-segmented oval high voltage coil 2 and a pressing plate 3.

[0021] The low voltage coil is covered with a paperboard I 11 outside the copper bar, thereby improving the short circuit protection capability; a main channel oil channel is arranged between the low voltage coil and the high voltage coil 2; the main channel oil channel is divided into an inner oil channel 5 and an outer oil channel 6 by three layers of diamond-shaped glued insulation paper 4; the end of the outer oil channel 6 is inserted into a small angle ring 8; the low voltage coil end is provided with a low voltage coil end insulation 13; the end of the high voltage coil 2 is provided with a high voltage coil end insulation; the outer side of the end insulation is crimped with a body insulation pressing plate 3; and the pressing plate 3 is fixedly provided with a cushion block 10 on one side.

[0022] The copper bar is covered with a paperboard I 11 in front and behind; a supporting strip is inserted between the diamond-shaped glued insulation paper 4, so as to support the gap as an oil channel; and the thickness of the paperboard I 11 is 0.5 mm.

[0023] The angle ring is an L-shaped paperboard, which is made of four 0.5 mm paperboards and is uniformly distributed above the outer oil channel 6; one end of the paperboard is inserted into the outer oil channel 6, and the other end of the paperboard covers the radial dimension of the high voltage coil 2, which is 10 mm, without shielding the high voltage coil oil channel 7.

[0024] Compared with the end insulation of the traditional transformer, the end insulation of the high voltage coil 2 is thickened to ensure the insulation distance, and the thickness dimension is changed to 33 mm.

[0025] The interlayer insulation of the high voltage coil 2 adopts graded insulation.

[0026] The low-voltage coil 1 is wound, and 2 pieces of 0.5mm paperboard I 11 are added on both sides of the outgoing copper row to prevent, wherein the outermost paperboard I 11 extends the low-voltage end insulation by 20mm, after winding, the main air channel oil channel is added, the main air channel oil channel is divided into two oil channels, the two sides of the oil channel are separated by diamond-shaped glued insulation paper 4, the corner ring is made of 4 pieces of 0.5mm paperboard, the corner ring covers the radial dimension of the high-voltage coil 2 by 10mm, does not block the high-voltage coil oil channel 7, a small corner ring 8 is added at the end of the second oil channel of the main air channel; the high-voltage adopts a non-segmented structure, the two-segment high-voltage coil 2 is changed to a single-segment, the original insulation end ring in the middle and at both ends of the high-voltage coil 2 is removed, the interlayer insulation adopts hierarchical insulation, in order to ensure the insulation distance, the high-voltage coil end insulation 9 is changed to 33mm thick, this structure is beneficial to the production of the automatic winding machine in the later period; the body insulation pressing plate 3 adopts an integrated pressing plate 3, the pressing plate 3 is made of 40mm thick laminated wood, the pressing plate 3 is divided into six pieces above and below the coil, the pressing plates 3 are staggered and tightly pressed, the axial pressing force is uniformly distributed, a 7mm thick laminated wood pad 10 is pasted below the pressing plate 3, the pad 10 is 50mm wide and has the radial dimension of the high-voltage coil 2, the pad 10 transmits the pressing force in the axial direction and is an oil flow channel of the transformer, ensures that the transformer oil in the oil channel of the low-voltage coil 1 flows smoothly, the pressing plate 3 is laid on the upper and lower ends of the coil, ensures that the short-circuit test passes, a 1mm paperboard II 12 is added between the upper and lower yokes of the core and the coil pressing plate 3 as an insulation guard plate; the gap between the low-voltage coil 1 and the core is tightly supported by a round stick made of water willow, and the stress is uniformly distributed.

[0027] The embodiment structure is suitable for a 35kV voltage grade oil-immersed transformer, the transformer coils all adopt an elliptical structure, the high-voltage coil 2 is not segmented and wound, the original body insulation and the insulation end ring structure of the high-voltage coil 2 are cancelled, and the upper and lower clamps, the upper and lower yokes are tightly fixed and pressed by the integrated pressing plate 3.

[0028] The new energy transformer anti-short circuit structure adopts the above structure, is simple and compact in structure, simplifies the coil structure of the original transformer, breaks the tradition that the anti-short circuit transformer must adopt a circular structure, solves the current situation that the elliptical cross section cannot pass the short circuit test, reduces the design and production cost of the product, and ensures the consistency of the appearance of the product. The transformer adopting the structure can ensure that each product passes the short circuit test. Meanwhile, the structure can be suitable for automatic production of the automatic winding machine.

Claims

1. A new energy transformer anti-short circuit structure, characterized in that: The transformer core, the oval low-voltage coil, the non-segmented oval high-voltage coil, the end insulation, the pressing plate, the low-voltage coil lead-out copper bar is covered with paperboard I, the short circuit protection ability is improved, the main channel oil channel is arranged between the low-voltage coil and the high-voltage coil, the main channel oil channel is divided into the inner oil channel and the outer oil channel by three layers of diamond-shaped glued insulation paper, the end of the outer oil channel is inserted into a small angle ring, the end insulation is arranged at the end of the low-voltage coil and the high-voltage coil, the pressing plate for body insulation is pressed outside the end insulation, and the gasket is fixed on one side of the pressing plate.

2. The short circuit resistance structure of a new energy transformer according to claim 1, characterized in that: The paperboard I is arranged in front of and behind the lead-out copper bar, and a supporting strip is inserted between the diamond-shaped glued insulation paper to support the gap as an oil channel.

3. The short circuit resistance structure of a new energy transformer according to claim 2, characterized in that: The thickness of the paperboard I is 0.5 mm.

4. The short circuit resistance structure of a new energy transformer according to claim 1, characterized in that: The angle ring is an L-shaped paperboard, which is uniformly distributed above the outer oil channel, one end of the paperboard is inserted into the outer oil channel, and the other end of the paperboard covers the radial dimension of the high-voltage coil and does not block the oil channel of the high-voltage coil.

5. The short circuit resistance structure of a new energy transformer according to claim 1, characterized in that: The thickness of the end insulation of the high-voltage coil is 33 mm. 6.The short circuit resistance structure of a new energy transformer according to claim 1, characterized in that: The pressing plate is made of laminated wood, and laminated wood gaskets are pasted below the pressing plate, the length of the gasket is the radial dimension of the high-voltage coil, and the gap between the gaskets is used as an oil flow channel of the transformer.

7. The short circuit resistance structure of a new energy transformer according to claim 1, characterized in that: A 1mm-thick paperboard II is added between the upper and lower yokes of the core and the coil pressing plate as an insulation guard.

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