CN201570353U - Continuous winding of radial tiny oil duct - Google Patents

Abstract

The continuous winding of the radial tiny oil duct is applied to the continuous winding of a transformer and mainly comprises an insulating cylinder, an inner winding, an outer winding, a radial oil duct cushion block, a winding axial stay and a discontinuous point chain-bonding cushion block, and is characterized in that: eight radial oil duct cushion blocks are uniformly distributed on the outer wall of the insulating cylinder, and the eight winding axial stays are opposite to the radial oil duct cushion blocks. And a discontinuous point chain-bonding type cushion block is added between the inner-layer winding and the outer-layer winding, and an internal oil flow channel is formed between the inner-layer winding and the outer-layer winding. The effect is as follows: the structure technology can greatly improve the heat dissipation efficiency of the continuous winding and improve the insulating capability; the filling rate of the iron core window is improved, the material is saved, and the cost is reduced by 5%; the overall height of the transformer is reduced, and the transformer is convenient to transport.

Description

A continuous winding with small oil channels in the width direction

technical field

The utility model relates to the technical field of power supply, in particular to a transformer, which is a continuous winding of a small oil passage in the transformer.

Background technique

The winding of the transformer is an important component of the transformer, and it can be called the heart of the transformer. There are many types of windings in transformers, such as layered windings, spiral windings, tangled windings, foil windings, continuous windings, etc. The continuous windings are mainly involved here. The continuous winding can have 1 to 6 wires and wind them into pie-shaped segments. The number of segments is usually an even number. The segments are separated by oil passages in the width direction. The thickness of the oil passage pads is 4.5 to 12mm. Each of its line segments is like a hairspring in a clock, and also like a disc spring, but the "hairspring" between the upper and lower line segments winds in the opposite direction. If the first line segment is a right helix, the second line segment is a left helix. The third line segment is right spiral again,……. In actual winding, the two layers of "hairspring" are connected to each other, and it is formed by continuous winding of a wire, so it is called continuous type. The supporting area at the end of the continuous winding is large, so the axial force does not change much when the short circuit occurs, the stability is strong, the mechanical strength is high, and the manufacturability is good. However, due to its own structural problems, heat dissipation can only rely on the upward convective oil flow on the inner and outer surfaces of the winding to drive the transformer oil to flow in the oil passage, thereby realizing the heat dissipation of the winding. In order to realize heat dissipation, so that the heat between the two line segments can be dissipated in time, and the transformer oil flow in the oil passage in the width direction can flow smoothly, it can only be solved by increasing the thickness of the pad block in the oil passage in the width direction. Generally, the thickness is not less than 4.5mm. The method is not only efficient Low, the effect is poor, and in order to make the transformer oil flow freely in the oil passage, the thickness of the pad in the oil passage should not be less than 4.5mm in principle, generally 4.5 ~ 12mm. Experiments have proved that if the thickness of the oil passage pad in the width direction is less than 4.5mm, the heat inside the winding cannot be dissipated in time, which will easily cause the local temperature rise in the center of the winding to be too high, thereby damaging the insulation and even developing into an accident. On the other hand, due to the increase in the number of spacers in this structure, the height of the winding is high, the filling rate of the core window is low, and the material consumption is high; The height of the shell is also greatly increased, which also has an adverse effect on road transportation. At present, the transportation of medium-sized transformers is mostly disassembled and assembled after arriving at the destination.

Utility model content

The purpose of this utility model is: to provide a continuous winding with a small oil passage in the width direction, change the continuous winding of the transformer, realize the smooth flow of transformer oil, accelerate heat dissipation; and greatly reduce the thickness of the oil passage in the width direction, reduce the and the height of the transformer; at the same time, the filling rate of the core window is improved, saving materials and reducing costs.

The technical scheme adopted by the utility model is: the continuous winding of the small oil passage in the width direction, mainly composed of an insulating cylinder, an inner layer winding, an outer layer winding, an oil passage spacer in the width direction, an axial support of the winding and a sticky chain type at the discontinuity point. The spacer is composed of pads, and the feature is that eight radial oil passage pads are evenly distributed on the outer wall of the insulating cylinder, and eight winding axial struts are opposite to the radial oil passage pads. A discontinuous sticky chain spacer is added between the inner winding and the outer winding to form an internal oil flow channel between the inner winding and the outer winding. Transformer oil can flow freely up and down in the channel formed by the sticky chain pad at the discontinuity point; at the same time, the thickness of the oil channel pad in the width direction can be reduced from 4.5mm to 1-2mm. This structure can be used for both high and low voltage windings.

The discontinuous sticky chain pad is composed of an insulating cardboard pad with a thickness of 0.08mm and a width of 10mm, an insulating cardboard pad with a thickness of 4.5mm and a width of 10mm. The lozenge paper tapes are glued together with white latex. The distance between insulating cardboard pads is 50-70mm.

Briefly describe the manufacturing process of continuous windings with small oil passages in the width direction:

See Figure 1. Install the insulating cylinder 1 on the winding machine, divide the circumference of the insulating cylinder equally according to the requirements, and fix the axial oil passage support 5 according to the equal division; adjust the speed of the winding machine, clear the counter, and prepare for winding. First wind the number of turns of the inner winding 2 of the winding enough according to the requirements of the drawing, and then wind the discontinuous point adhesive chain pad 6 together with the wire. 6. Cut off and continue to complete the number of turns of the outer winding 3. After inter-segment transposition, enter the winding system of the next line segment, in the same way, place a discontinuous point sticky chain type spacer 6... in the same position. After all the wire segments are wound, viewed from the end of the winding, a circle of channels appears in the middle of the wire segments, through which the transformer oil flows. Since a new heat dissipation channel is established inside the winding, the oil flow is more smooth, so the size of the radial oil passage pad can be greatly reduced, from a minimum of 4.5mm to 1-2mm. Other process requirements are the same as traditional continuous winding.

Beneficial effects of the utility model: the continuous winding of the utility model with small oil passages in the width direction changes the structural type of the traditional continuous winding, adopts the micro oil passage structure technology in the width direction, and at the specific position of each line segment of the continuous winding, Along with the wire, it is wound into a circle of discontinuous adhesive chain pads to form a continuous space for the entire winding from bottom to top, so that the transformer oil can flow smoothly from this channel to facilitate the heat dissipation of the winding; on the other hand, the oil channel The thickness of the winding is reduced from a minimum of 4.5mm to 1-2mm, and the size of the winding width to the insulating spacer is reduced by 50-60%, which greatly reduces the height of the winding. It can greatly improve the cooling capacity of the winding, improve the insulation capacity, improve the short-circuit resistance of the winding, increase the filling rate of the iron core window, save materials, reduce the overall size of the transformer, and facilitate transportation.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the continuous winding structure of the utility model in the radial direction of the tiny oil passage.

FIG. 2 is a schematic diagram of the development of the discontinuous sticky chain spacer 6 .

In Figure 1, 1. Insulation cylinder, 2. Inner winding, 3. Outer winding, 4. Radial oil passage pad, 5. Winding axial support, 6. Discontinuous point sticky chain pad, 7. Rubber rhombus paper tape, 8. Insulating cardboard spacer.

Detailed ways

Embodiment 1: Taking the continuous winding of the small oil channel in the width direction of the SZ11-M-6300/35/6.3 transformer as an example, the utility model is further described in detail.

See Figure 1. The continuous winding of the utility model's small oil passage in the width direction is mainly composed of an insulating cylinder 1, an inner winding 2, an outer winding 3, an oil passage pad 4 in the width direction, a winding axial support 5 and a sticky chain pad at a discontinuity point. Block 6, characterized in that: on the outer wall of the insulating cylinder 1, there are eight radial oil passage pads 4 evenly distributed, and eight winding axial struts 5 are opposite to the radial oil passage pads 4. Between the inner layer winding 2 and the outer layer winding 3, a discontinuous adhesive chain spacer 6 is added, thereby forming an internal oil flow channel between the inner layer winding 2 and the outer layer winding 3, and the transformer oil can be discontinuous In the passage formed by point-adhesive chain type cushion block 6, smooth flow up and down.

See Figure 2. The discontinuous sticky chain spacer 6 is composed of a dispensing diamond paper tape 7 with a thickness of 0.08mm and a width of 10mm and an insulating cardboard spacer 8 with a thickness of 4.5mm and a width of 10mm and a length 1mm less than the width of the wire. , insulating cardboard spacer 8 is glued together with white latex with dispensing rhombus paper tape 7. The distance between the insulating cardboard pads 8 is 55mm.

The continuous winding with small oil passages in the width direction, the winding method of the high and low voltage windings is the same, and the continuous small oil passage structure technology in the width direction is adopted.

The diameter of the low-voltage insulation cylinder 1 is 363/371×815mm; the specification of the winding axial support 5 is 6×1020mm and fixed evenly on the circumference of the insulation cylinder 1, and the low-voltage wire is made of 2.36×10.60mm/2.81×11.05mm paper The flat copper wire is wound on the axial support 5 of the winding according to the requirements. After one turn is wound, the discontinuous adhesive chain spacer 6 with a thickness of 4.5 mm, a width of 10 mm and a length of 10 mm is wound in together with the wire. One turn forms the axial oil flow channel inside the low-voltage winding, and then winds to the specified number of turns according to the drawing to complete the winding of the outer winding of the low-voltage winding. The radial oil passage pads 4 are alternately placed with 1mm and 2mm, and the height of the low-voltage winding is 760mm. The circumference size is 385/482mm in diameter.

The size of the high-voltage insulation cylinder is 498/504×794mm in diameter; the winding axial support 8×994mm is evenly distributed and fixed on the circumference of the insulation cylinder, and the high-voltage wire is made of paper-wrapped flat copper wire of 1.90×10.60mm/2.50×11.20mm. According to the requirements of the drawings, it is wound on the axial support of the winding. After winding to 4 turns, the discontinuous adhesive chain spacer with a thickness of 4.5, a width of 10, and a length of 10.5 is wound into a circle together with the wire to form the inner shaft of the high-voltage winding. to the oil flow channel. The radial oil passage pads are staggered by 1mm and 2mm, the height of the high voltage winding is 760mm, and the circumference size is 522/635mm in diameter. After the high and low voltage windings are assembled, the window size of the iron core is 660mm from center to center, and the window height is 855mm.

Claims (2)

1. the width of cloth is to the continous way winding of small oil duct, mainly form to the sticking chain type cushion block (6) of oil duct cushion block (4), axis of winding stay (5) and discontinuous point by insulating cylinder (1), internal layer winding (2), outer winding (3), the width of cloth, it is characterized in that: be evenly distributed with eight width of cloth to oil duct cushion block (4) on insulating cylinder (1) outer wall, eight axis of winding stays (5) are relative to oil duct cushion block (4) with the width of cloth; Between internal layer winding (2) and outer winding (3), add the sticking chain type cushion block (6) of discontinuous point, between internal layer winding (2) and outer winding (3), form the interior oil circulation road.

2. the width of cloth according to claim 1 is to the continous way winding of small oil duct, it is characterized in that: the sticking chain type cushion block (6) of described discontinuous point is to be 0.08mm by thickness, width is that some glue water chestnut ruled paper band (7) and the thickness of 10mm is 4.5mm, width is that the insulating board cushion block (8) of 10mm is formed, insulating board cushion block (8) sticks together with putting glue water chestnut ruled paper band (7), and the distance between the insulating board cushion block (8) is 50～70mm.

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