CN209626010U

CN209626010U - Spiral plate type winding

Info

Publication number: CN209626010U
Application number: CN201920379545.6U
Authority: CN
Inventors: 高大为; 孙铭鸿; 孙崇山
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-25
Filing date: 2019-03-25
Publication date: 2019-11-12
Anticipated expiration: 2029-03-25

Abstract

The utility model is a kind of transformer winding.It is mainly used in shell-type and the core type transformer of winding alternating expression arrangement.Compared with Helical winding, improve that fill factor in iron core barred window, high mechanical strength, anti-short circuit capability are strong, good cooling results, overload capacity is strong, compact-sized, lead is easy for installation.

Description

Spiral plate type winding

Technical Field

The invention relates to a winding for a transformer. The core type transformer is mainly applied to core type transformers with shell type and winding staggered arrangement.

Background

The transformer is one of the most important power equipment used in power grids and power systems, and is mainly composed of an iron core and a winding (also called a coil). The transformer winding mainly comprises a cylindrical coil, a spiral coil, a continuous coil, a knot coil, an insertion capacitor type (inner shielding type), a knot continuous coil, a double-cake coil, a splayed coil and the like.

Another special winding type in the transformer is that when the number of turns of the low-voltage winding of the electric furnace and the rectifier transformer is less than 3, copper plate bending winding can be adopted, as shown in fig. 1, 2, 3 and 4.

The spiral winding is a structure of a transformer winding, each turn is formed by connecting a plurality of wires (flat wires, the shape of each flat wire is similar to a rectangle and is divided into width and thickness) in parallel, each parallel wire is overlapped in the width direction of the flat wire, each turn of the winding is one turn, the width of each turn is the width of the flat wire, the height of each turn is the thickness of the flat wire multiplied by the number of the parallel wires, and the turns are separated by a cushion block.

The spiral winding is divided into single spiral, double spiral, four spiral, six spiral and the like. The single spiral has only one strand of spiral, a cushion block is arranged between the similar wire turns, the double spiral, the four spiral and the six spiral are respectively formed by connecting two strands of spiral, four strands of spiral and six strands of spiral in parallel, and the cushion blocks are arranged between the adjacent strands and between turns. In order to make the lengths of the parallel wires of the spiral winding equal and make the probability of the positions of the parallel wires in the leakage magnetic field equal so as to reduce the circulating current of the parallel wires, the wires need to be transposed at certain specific positions of the winding.

The spiral winding has good mechanical stability and good heat dissipation capability. When the conductor is applied to a shell type transformer, the manufacturing manufacturability is poor due to the fact that bare wires are wound, and the area is reduced due to the fact that a plurality of conductors are wound in a parallel overlapping mode and all the conductors need to be chamfered.

Disclosure of Invention

The spiral plate type winding is characterized in that: in the spiral plate type winding, each turn of the winding is replaced by a copper plate or an aluminum plate;

the thickness of the copper plate or the aluminum plate is the width of each strand of conducting wire of the spiral winding, and the radial width of the copper plate or the aluminum plate is the bare wire height of each strand of conducting wire in parallel in the radial direction of the spiral winding;

wherein, the turns are welded with the copper plate or the aluminum plate between turns, and the head and the tail of the winding are welded and led out at one end or two ends of the winding;

the first turn copper plate or aluminum plate and the last turn copper plate or aluminum plate of the winding adopt a flattening structure, namely the tail part of the first turn of the winding is bent in a similar Z shape, the head part and the tail part of the first turn of the winding are parallel and level on the end surface of the winding, the head part of the last turn of the winding is bent in a similar Z shape, the head part and the tail part of the last turn are parallel and level on the end surface of the winding, and the copper plate or the aluminum plate on two end surfaces of the whole winding is a plane.

The spiral plate type winding is characterized in that: the spiral plate type winding leveling structure comprises a leveling structure for any turn of the first turn and any turn of the back of the first turn, and the spiral plate type winding leveling structure comprises a leveling structure for any turn of the last turn and any turn of the front of the last turn.

The spiral plate type winding is characterized in that: in the interleaved winding structure of the spiral plate type winding with the flattening structure, the calculation method of the impedance voltage leakage area of each magnetic balance group is the same as that of a continuous winding, namely the height of the winding is equal to the distance between bare wires in the height direction, namely the wire height is multiplied by the number of turns of each layer and the inter-turn insulation is added.

The calculation of the magnetic leakage area of the spiral plate type winding is the same as that of the continuous type winding, and the height of the spiral type winding needs to be reduced by one turn of line height when the magnetic leakage area is calculated, which is also an important difference from the spiral type winding.

The spiral winding is improved based on the characteristics of shell transformer and staggered winding and is designed to increase the mechanical strength of winding.

Spiral plate winding, a new form of winding, is shown in diagram 12 (where b is the thickness of the copper plate). The iron core of the novel transformer is of a core type structure, but the magnetic field of the novel transformer is similar to that of a shell type transformer, and the parallel wires of each turn of the spiral winding do not need to be insulated and transposed, so that the parallel wires can be replaced by plates with the same area and the same material as the multiple parallel wires, such as copper plates and aluminum plates (for convenience of description, copper plates for short), and the first turn copper plates and the last turn copper plates of the winding can adopt a flattening structure. Due to the characteristics of the novel transformer and the spiral plate type winding, the spiral plate type winding has a good heat dissipation effect, and the turns can be separated by thin insulation blocks without using cushion blocks, such as a paperboard with the thickness of 0.5mm, and the cushion blocks are arranged between the turns as required according to the heat dissipation requirement. The spiral plate type winding has the greatest advantages that the height of the winding is reduced, and the filling coefficient in an iron window is greatly improved.

The flattening structure of the spiral plate type winding is shown in fig. 12, and due to the spiral property of the winding structure of the winding, a height difference of the thickness of the copper plate exists between the head and the tail of the first turn of copper plate and the last turn of copper plate, which has the biggest influence on short-circuit electrodynamic force and impedance calculation. And a similar Z-shaped bend is folded at the tail part of the first turn of copper plate to enable the first turn of copper plate to be level on the end surface of the winding, a similar Z-shaped bend is folded at the head part of the last first turn of copper plate to enable the last turn of copper plate to be level on the end surface of the winding, and thus the two end surface copper plates of the whole winding are a plane. Each turn of copper plate or a plurality of turns of copper plates can adopt a flattening structure. The spiral plate type winding can adopt a flat connection structure or a flat connection structure according to the design requirement.

The cross section of the spiral plate type winding or each turn of the copper plate is in a shape of an oval, an ellipse, a rectangle or a combination of a plurality of groups of curves. The long circular cross section is that the two ends are semicircles with equal diameters, the middle is connected by a straight line, the diameter of the semicircle is called a winding short axis, the diameter of the winding and the length of the straight line are called a winding long axis, and fig. 7 is a long circular cross section. The ellipse is well understood, that is, the circumscribed form of the core and winding cross-section is an ellipse, also divided into major and minor axes, as shown in fig. 8. The shape formed by combining a plurality of groups of curves is a shape formed by combining a plurality of curves or straight lines, for example, fig. 9 is a section similar to an ellipse formed by combining four groups of circular curves with point A, B as a center. Fig. 10 is a circular cross section.

Technical effects

First, the fill factor in the core window is improved compared to a spiral winding.

Secondly, compared with a spiral winding, the mechanical strength is high, and the short-circuit resistance is strong.

Thirdly, compared with a spiral winding, the cooling effect is good, and the overload capacity is strong.

Drawings

Fig. 1 is a top view of a splayed winding with only one turn made of conventional copper bar bending.

Fig. 2 is a top view of a conventional two-turn splayed winding formed by bending a copper bar.

Fig. 3 is a top view of a winding with only one turn formed by bending a conventional copper bar.

Fig. 4 is a top view of a winding with only two turns made of conventional copper bar bending.

Fig. 5 is a front view of a conventional spiral winding.

Fig. 6 is a front view of a spiral plate winding with end insulation (the head and the tail are drawn as if the head and the tail are visual, and the head and the tail are convenient to be drawn from the spoke).

Fig. 7 is a front view of a spiral plate type winding with a flattened structure (the head and the tail are drawn in a visual mode, and the head and the tail are actually drawn in a radial direction for convenience in extending).

Figure 8 is a top view of an oblong spiral plate winding.

Figure 9 is a top view of an elliptical spiral plate winding.

Fig. 10 is a top view of a spiral plate type winding composed of a plurality of groups of curves surrounded by four sections of circular arcs.

Figure 11 top view of a circular spiral plate winding.

Fig. 12 shows a coil plate winding flattening structure.

Wherein,

1 is a copper bar.

2 is a wire turn wound around a plurality of wires in a spiral winding.

And 3 is a spiral plate winding end insulation (there may be no end insulation).

And 4 is a spiral plate type winding copper plate or aluminum plate.

And 5, filling insulation (a cushion block can also be used) in the spiral plate type winding flattening structure.

Detailed Description

The low voltage winding of example 1, S13-400/10 ± 2 × 0.25%/0.4, was selected as an endless insulated spiral plate winding, as shown in fig. 7.

Because of the six magnetic balance groups, there are six groups of windings.

A low-voltage winding: the spiral plate type winding belt is of a flattening structure, and the cross section is in an oblong shape.

The number of turns is 24 turns.

Copper plate 5 × 41.

Two single magnetic equilibrium groups 4 turns.

Two double magnetic balance groups 8 turns.

The minor axis inner diameter is 165 mm.

Minor axis outer diameter 247 mm.

Major axis inner diameter = minor axis inner diameter + linear distance =165+40 × 2=245 mm.

Major axis outer diameter = minor axis outer diameter + linear distance =241+40 × 2=321 mm.

Winding height =27 mm.

Winding height =27mm for impedance voltage calculation.

Claims

1. The spiral plate type winding is characterized in that: each turn of the winding is replaced by a copper plate or an aluminum plate;

2. The spiral plate winding of claim 1, characterized by: the spiral plate type winding leveling structure comprises a leveling structure for any turn of the first turn and any turn of the back of the first turn, and the spiral plate type winding leveling structure comprises a leveling structure for any turn of the last turn and any turn of the front of the last turn.

3. The spiral plate winding of claim 1, characterized by: in the interleaved winding structure of the spiral plate type winding with the flattening structure, the calculation method of the impedance voltage leakage area of each magnetic balance group is the same as that of a continuous winding, namely the height of the winding is equal to the distance between bare wires in the height direction, namely the wire height is multiplied by the number of turns of each layer and the inter-turn insulation is added.