JP3294109B2 - Winding for electrical equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding for electric equipment suitable for use in stationary induction equipment such as an instrument transformer.

[0002]

2. Description of the Related Art Usually, this kind of winding is performed by winding a wire a required number of times per layer, then winding a strip-shaped interlayer insulating paper (layer paper), and performing this operation several tens to one hundred and several tens times. By repeating, the whole winding is formed in a multilayer cylindrical shape.

FIG. 8 shows a typical winding configuration of a conventional transformer for an instrument, wherein 1 is a core portion, and 2 is a low-voltage coil wound on the outer peripheral surface of the core portion 1 in multiple layers. Secondary winding,
Reference numeral 3 denotes a main insulating material made of a PET film or the like, and 4 denotes a primary winding as a high-voltage coil wound around the outer peripheral surface of the main insulating material 3 in multiple layers. FIG. 9 is a sectional view taken along line BB of FIG.
The primary winding 4 and the interlayer insulating paper 5 interposed between the layers are exaggerated for convenience.

In the above-mentioned prior art, the primary winding 4 and the secondary winding 2 are wound while applying a constant tension.
The electric wires constituting these windings are always subjected to a tightening force directed toward the cylindrical axis, thereby preventing the electric wires from being displaced or falling off and maintaining the overall shape of the windings.

[0005]

However, since a force is always applied to the wire in the direction of the axis, the wires located near both ends in the axial direction (left and right ends in FIG. 9) are displaced or dropped. Tends to occur. In particular, when the electric wire is a round wire, the danger is high.

Further, these windings are always heated and dried as a moisture-proof treatment. However, there is a difference in the coefficient of thermal expansion between the electric wire and the interlayer insulating paper, and this causes a difference between them. Also, in the case of a resin-molded transformer, the resin that has entered between the electric wire and the interlayer insulating paper acts as a lubricant, reducing the frictional force between the two, and the external force during the installation work or transportation causes Are easily displaced along the axial direction or fall off toward the axis.

[0007] As a technique for preventing displacement or dropping of electric wires, for example, as described in Japanese Patent Application Laid-Open No. 3-109705, a continuous convex portion is formed at both axial ends of an interlayer insulating paper. There is. However, in this conventional technique, there is a problem that a large amount of cost is required for processing the convex portion, workability at the time of winding work is poor, and it is particularly difficult to perform a winding process.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a winding for electric equipment which can prevent the wire from slipping or falling off at a low cost without hindering the winding operation.

[0009]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an electric wire wound in a multilayer and cylindrical shape, and an insulating paper wound between each layer of the electric wire. In a winding for electric equipment having a sheet-shaped interlayer insulating material made of an insulating synthetic resin, the winding end of the interlayer insulating material is substantially orthogonal to the axial direction on both sides outward of the winding width of the electric wire. A notch is formed, and when the electric wire is wound around the outer peripheral surface of the interlayer insulating material, an erecting piece that rises from the notch along the tangential direction of the outer peripheral surface is formed.

According to a second aspect of the present invention, there is provided a winding for electric equipment comprising a multilayer and cylindrically wound electric wire, and a sheet-like interlayer insulating material wound between respective layers of the electric wire. A large number of cuts substantially parallel to the axial direction are formed at both side edges along the winding direction of the interlayer insulating material, and when the electric wire is wound on the outer peripheral surface of the interlayer insulating material, the upright standing from the cut is formed. A piece is formed.

In the present invention configured as described above, the standing pieces are formed on both sides of the winding width of the electric wire in a state where the electric wire is wound on the outer peripheral surface of the sheet-like interlayer insulating material. Thus, it is possible to prevent the electric wires near both ends of the winding width from being displaced along the axial direction of the entire winding or falling off toward the axis.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. First, FIGS. 1 to 4 show an embodiment of the first aspect of the present invention, and show an example in which the present invention is applied to a winding of an instrument transformer. In FIG. 1, reference numeral 50 denotes an interlayer insulating paper as a sheet-like interlayer insulating material, and the whole is formed in a strip shape.

The interlayer insulating paper 50 is used for, for example, a winding of a resin-molded transformer, focusing on the impregnation property of the resin. Depending on the surrounding insulating medium, a film made of a synthetic resin may be used in the case of a gas-insulated winding for equipment or the like.

Since the interlayer insulating paper 50 is interposed between the windings of each layer, its long side is slightly longer than the peripheral length of the cylindrically wound winding, and its short side is one line. Are slightly longer than the width of the entire winding layer. On both sides of the winding end portion (short side portion) of the interlayer insulating paper 50,
A notch 51 having a slight depth is formed at a right angle to the short side. Thereby, as described below, when the interlayer insulating paper 50 is wound between the layers of the winding, the upstanding pieces 52 are formed outside the cuts 51.

That is, FIG. 2 shows a state in which the electric wire 40 is wound around the outer peripheral surface of the interlayer insulating paper 50. Interlayer insulating paper 5
When the wire 0 is wound around a lower wire or core portion and then the wire 40 is wound with a constant tension on the outer peripheral surface thereof, the interlayer insulating paper 50 is formed in a substantially circular cross section according to the wire 40. At this time, the outer peripheral surface of the interlayer insulating paper 50 around which the electric wire 40 is wound is along the curved surface of the circle, while the outer portion of the cut 51 is directed to the tangential direction of the outer peripheral surface (the tangential direction of the circle). In order to stand up, the above-mentioned upright pieces 52 stand up along this tangent line and are formed.

Since the upstanding pieces 52 are formed on both sides of a row of electric wires 40 as shown in FIG. 3 and function as stoppers, the electric wires 40 may be displaced in the axial direction or fall off from both sides toward the cylindrical shaft. Disappears. In addition, it is preferable that the length of the overlap portion at the start and end of winding of the interlayer insulating paper 50 is about 10 mm to 20 mm. The positions where the cuts 51 are made may be on both sides of the winding width of the electric wire 40 (= the number of turns of the electric wire 40 (copper wire) × wire diameter), as is apparent from FIG.

Here, if the sheet-like interlayer insulating material is formed of a polyester tape, the effect of the upright piece 52 as a stopper becomes more remarkable because the polyester has the rigidity commonly known as polyester.

The shape of the entire winding is not limited to a cylindrical shape.
As shown in the figure, the shape may be a rectangular tube or a cylinder having an oval cross section. In that case, when the upright pieces 52 are arranged at the corners,
It is more effective in preventing slippage and falling off.

Further, the interlayer insulating paper 50 is interposed between all the layers of the winding, but the standing pieces 52 between the respective layers are provided.
Should not be arranged so as to be radially continuous from the center of the entire winding (the center of the circular cross-section if the entire winding is cylindrical), but should be dispersed and shifted appropriately along the circumferential direction. Thereby, a substantially uniform displacement / fall prevention effect can be obtained over the entire circumference of the winding.

Next, FIGS. 5 to 7 show an embodiment of the invention according to claim 2. FIG. In FIG. 5, reference numeral 60 denotes an interlayer insulating paper as a sheet-like interlayer insulating material. The whole of the interlayer insulating paper 60 is formed in the shape of a strip like the above-mentioned interlayer insulating paper 50, and its long side is substantially equal to the peripheral length of the winding wound in a cylindrical shape, and its short side is arranged in a line. It is slightly longer than the width of the entire line.

On both side edges (long sides on both sides) of the interlayer insulating paper 60 along the winding direction, a large number of cuts 61 parallel to the short sides are formed at regular intervals. The distance L between the deepest portions of the cuts 61 on both sides corresponds to the winding width shown in FIG.

By forming a large number of cuts 61 at both side edges of the interlayer insulating paper 60 in this manner, the electric wire 40 is fixedly tensioned on the outer peripheral surface of the interlayer insulating paper 60 wound around the outer peripheral surface of the lower electric wire. When further wound, as shown in FIG. 6, the portion sandwiched by the cuts 61 forms a substantially polygonal shape with a side length H as viewed from the side. Note that the depth of the cut 61 is W
Indicated by

At the same time, since a force directed toward the cylindrical axis is applied by the electric wire 40 to the central portion in the axial direction of the interlayer insulating paper 60, the portion sandwiched by the cuts 61 has a length t from the reference plane of the central portion. As a result, the standing piece 62 is formed as shown in FIGS. 6 and 7. Since the upright pieces 62 are inclined toward the outermost wire 40 side of the parallel wires 40, the upright pieces 62
It can be prevented from shifting to the side or falling off toward the axis.

Also in this embodiment, a synthetic resin film may be used as the sheet-like insulating material. The present invention is applicable to not only the primary winding and the secondary winding of the transformer but also various windings for electric devices including a solenoid, an electromagnet coil and the like.

[0025]

According to the present invention, as described above,
Even if a complicated process such as a convex portion in Japanese Patent Application Laid-Open No. 109705 is not performed, displacement and falling off of the electric wire can be prevented only by a simple process of making a cut in the interlayer insulating material.
In addition, it is possible to produce a winding excellent in the function of preventing the wire from slipping and falling off in substantially the same process as the conventional winding work, which greatly contributes to a reduction in manufacturing cost.

[Brief description of the drawings]

FIG. 1 is a perspective view of an interlayer insulating paper according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of an operation of the embodiment of FIG. 1;

FIG. 3 is a diagram showing the width of the interlayer insulating paper of FIG. 1;

FIG. 4 is a diagram showing a use state of the embodiment of FIG. 1;

FIG. 5 is a perspective view of an interlayer insulating paper according to the second embodiment of the present invention.

FIG. 6 is a diagram showing a use state of the embodiment of FIG. 5;

FIG. 7 is a sectional view taken along line AA of FIG. 6;

FIG. 8 is a side view showing a typical winding configuration of a conventional instrument transformer.

FIG. 9 is a sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 40 electric wire 50,60 interlayer insulating paper 51,61 cut 52,62 standing piece

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01F 27/32

Claims (2)

(57) [Claims] 1. An electric device winding comprising a multilayered and cylindrically wound electric wire and a sheet-like interlayer insulating material wound between respective layers of the electric wire, wherein the winding of the interlayer insulating material is performed. At the end end, a cut substantially perpendicular to the axial direction is formed outward on both sides of the winding width of the electric wire,
A winding for electric equipment, wherein an upstanding piece that rises from the cut is formed along a tangential direction of the outer peripheral surface when an electric wire is wound around the outer peripheral surface of the interlayer insulating material. 2. An electric equipment winding comprising a multilayered and cylindrically wound electric wire, and a sheet-like interlayer insulating material wound between respective layers of the electric wire, wherein: On both side edges along the winding direction, a number of cuts substantially parallel to the axial direction are formed, and when the electric wire is wound on the outer peripheral surface of the interlayer insulating material, a standing piece that rises from the cut is formed. Features windings for electrical equipment.