JP2002353039A - Winding of induction electric apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time required for insulation coating work of a lead-out part and to enhance workability of lead connection work by enhancing the cooling characteristics of the lead-out part. SOLUTION: Conductors 1 transposed such that the position of each layer of a plurality strand conductors laid in parallel is altered sequentially in the length direction and restriction members are arranged, at an interval, on the outer circumference is wound tubularly and parts 3A and 3B being led out radially outward from the transposed conductors 1 are retained from the opposite sides in the axial direction by means of insulating spacers 10 interposed between the turns of the transposed conductors 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a lead portion of a large current winding such as a low voltage winding of an industrial transformer or a transformer for a power plant.

[0002]

2. Description of the Related Art FIG. 5 is a side view of a main part showing the structure of a conventional induction winding. The dislocation conductor 1 is wound into a cylindrical shape and 3
One block is formed for each turn, and the lead portions 3A and 3B are drawn from each block to the outer diameter side of the induction winding. A current flows in parallel to each block via the outlets 3A and 3B, forming a large current winding. An insulating spacer 2 for insulation and cooling is interposed between turns of the dislocation conductor 1.

FIG. 6 is a view taken in the direction of the arrow X in FIG. 5, and shows a main portion around the outlet portions 3A and 3B. An insulating vertical duct 6 is arranged along the inner diameter side of the dislocation conductor 1 and perpendicular to the paper surface, and the vertical duct 6 is fitted into a hook-shaped notch formed in the spacer 2 and the spacer 2 is locked. It has become. The lead portions 3A and 3B of the dislocation conductor 1 are covered with an insulating paper layer 7. The insulating paper layer 7 is formed of, for example, 0.
It is formed by winding insulating paper having a thickness of 075 mm twice around the outer periphery of the dislocation conductor 2 in a half width overlapping manner. This is because it is necessary to bend the transposition conductor 1 to the outer diameter side of the induction winding when forming the lead portions 3A and 3B.
This is in order to prevent the individual wires from being separated.

FIG. 7 is a perspective view showing a main configuration of the dislocation conductor 1 of FIG. In the dislocation conductor 1, the lamination position of the plurality of strand conductors 8 stacked in parallel sequentially changes in the dislocation portion 1A in the length direction, and a restraining member 9 such as an insulating string is adjacent to the outer periphery of the dislocation conductor 1. It is wound so as to leave a gap between the restraining members. As the restraining member 9, for example, a heat-shrinkable tape, a polyester string in which a plurality of fishing line-like polyester materials are combined, and a material having high tensile strength and excellent heat resistance are used. The transposition conductor 1 is particularly excellent in cooling characteristics because the strand conductor 8 is exposed from the gap between the adjacent restraining members, and is used for a large-current induction winding. The dislocation conductor 1 has a configuration in which a plurality of strand conductors 8 are bundled in parallel in order to prevent the current from being concentrated on the conductor surface due to the skin effect by dividing the conductor into pieces. The conductors 8 are bundled. The reason why the wire conductors 8 are transposed is to make the current flowing through each wire conductor 8 the same. Each of the strand conductors 8 is covered with an insulating film (not shown). That is,
The insulating film includes a thin enamel insulating layer covering the outer periphery of the wire conductor 8 and a thin heat-fusible insulating resin layer further covering the outer periphery of the enamel insulating layer. This heat-fusible insulating resin layer is used for fusing the element conductors 8 to each other at the time of preheating after being wound as an induction electric device winding. As a result, the bending strength of the dislocation conductor 1 is increased, so that the dislocation conductor 1 can sufficiently withstand the electromagnetic mechanical force generated when the induction winding is short-circuited.

[0005]

However, the conventional induction motor winding as described above has problems that the number of winding steps is large and the cooling characteristics are poor. That is, since it is necessary to cover the lead portion of the dislocation conductor with the insulating paper layer 7, much time is required for the insulating coating work of the lead portion. In addition, the cooling property of the outlet portion was deteriorated because it was covered with the insulating paper layer 7. Further, at the time of preheating (120 ° C., 120 hours) in which the induction winding is fastened and dried by itself, the lead portion covered with the insulating paper layer 7 is solidified, and the workability of lead connection has been deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to prevent a lot of time from being required for an insulating coating work on a lead-out portion, to improve cooling characteristics of the lead-out portion, and to improve workability of lead connection.

[0007]

According to the present invention, in order to attain the above object, according to the present invention, transposition is performed such that each lamination position of a plurality of element conductors laminated in parallel sequentially changes along the length direction. A transposition conductor formed by winding a constraining member on the outer periphery so as to leave a gap between adjacent constraining members is wound in a cylindrical shape, and an outlet portion drawn out from the dislocation conductor to the outer diameter side. Is preferably suppressed from both sides in the axial direction by insulating spacers interposed between the turns of the dislocation conductor. As a result, the work of insulating the lead portion is eliminated. Further, since the insulating paper layer at the outlet portion is eliminated, the cooling characteristics of the outlet portion are improved, and the outlet portion is not so hard at the time of preheating.

In such a configuration, an insulating vertical duct that is long in the axial direction is arranged along the inner diameter side of the dislocation conductor, and the spacer is locked by the vertical duct, whereby the spacer is formed. Securely fixed. Also,
In such a configuration, the spacer may be shared with an insulating gap material arranged at a predetermined pitch in a circumferential direction between turns of the dislocation conductor. Thereby, the number of parts of the spacer and the insulating gap material is reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on embodiments. FIG. 1 is a side view showing the configuration of an induction winding according to an embodiment of the present invention. Insulating spacer 1 having lead portions 3A and 3B interposed between turns of dislocation conductor 1.
At 0, it is suppressed from both sides in the axial direction.

FIG. 2 is a view taken in the direction of the arrow Y in FIG. 1, and shows the main parts around the outlets 3A and 3B. An insulating vertical duct 6 is arranged along the inner diameter side of the dislocation conductor 1 and perpendicular to the paper surface, and a spacer 10 is locked to the vertical duct 6. 1 and 2 are the same as the conventional configuration in FIGS. 5 and 6, and the same parts as those in the conventional art are denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1, the lead portions 3A and 3B are suppressed from both sides in the axial direction by the spacers 10 interposed between the turns of the dislocation conductor 1, so that the strands of the dislocation conductor 1 can be separated. It is not necessary to cover the lead portions 3A and 3B with an insulating paper layer as in the related art. For that purpose, the opening part 3A,
The working time of 3B is shortened, and the cost can be reduced. Further, since the dislocation conductor 1 becomes naked, the lead portions 3A,
The cooling characteristics of 3B are also improved. Further, the lead portion does not become so hard even at the time of preheating, and the workability of lead connection is improved. This also reduces costs. Furthermore, since the spacer 10 is locked to the vertical duct 6, the spacer 10 is securely fixed, and the reliability of the induction winding is improved.

FIG. 3 is a side view showing the configuration of an induction winding according to another embodiment of the present invention. Exit 3A,
3B is suppressed from both sides in the axial direction by insulating spacers 11 interposed between turns of the dislocation conductor 1. FIG.
FIG. 4 is a view taken in the direction of the arrow Z in FIG. 3, and shows a main part around the outlet portions 3A and 3B. An insulating vertical duct 6 is arranged along the inner diameter side of the dislocation conductor 1 and perpendicular to the paper surface, and the spacer 11 is locked to the vertical duct 6. The spacers 11 locked to the vertical duct 6 are arranged at a predetermined pitch in the circumferential direction. The predetermined pitch means that one circumference is distributed 24 times or 26 times.
Evenly distributed, an insulating gap between turns of the dislocation conductor 1 is ensured. Two of the spacers 11 arranged in the circumferential direction are used for suppressing the lead portions 3A and 3B.

The other parts of FIGS. 3 and 4 are the same as those of FIGS. 1 and 2. Components for securing the insulating gap between turns of the dislocation conductor 1 and components for suppressing the lead portions 3A and 3B can be shared as the spacer 11, and the cost can be reduced by reducing the number of components.

[0014]

As described above, according to the present invention, a plurality of wire conductors stacked in parallel are transposed so that the stacking positions of the plurality of wire conductors are sequentially changed along the length direction, and the restraining member is adjacent to the outer periphery. A dislocation conductor formed by winding so as to leave a gap between the constraint members is wound in a cylindrical shape, and a lead portion drawn out from the dislocation conductor to the outer diameter side is interposed between turns of the dislocation conductor. By using the insulating spacers that are suppressed from both sides in the axial direction, the working time of the lead portion and the work time of lead connection are shortened, the cost is reduced, and the cooling characteristics of the lead portion are improved. .

Further, in such a configuration, an insulating vertical duct which is long in the axial direction is arranged along the inner diameter side of the dislocation conductor, and the spacer is locked by the vertical duct, whereby the spacer is formed. It is securely fixed, and the reliability of the induction winding is improved. Further, in such a configuration, the number of parts is reduced and the cost is further reduced by sharing the spacer with the insulating gap material arranged at a predetermined pitch in the circumferential direction between the turns of the dislocation conductor.

[Brief description of the drawings]

FIG. 1 is a side view showing a configuration of an induction winding according to an embodiment of the present invention.

FIG. 2 is a view taken in the direction of the arrow Y in FIG. 1;

FIG. 3 is a side view showing the configuration of an induction winding according to another embodiment of the present invention.

FIG. 4 is a view taken in the direction of the arrow Z in FIG. 3;

FIG. 5 is a side view of a main part showing a configuration of a conventional induction winding.

FIG. 6 is a view taken in the direction of the arrow X in FIG. 5;

FIG. 7 is a perspective view showing a main configuration of the dislocation conductor of FIG. 5;

[Explanation of symbols]

1: dislocation conductor, 2, 10, 11: spacer, 3A, 3
B: outlet, 6: vertical duct, 8: wire conductor, 9: restraining member

Claims (3)

[Claims] A plurality of wire conductors stacked in parallel are transposed such that the lamination positions of the wire conductors are sequentially changed in the longitudinal direction, and a constraint member is provided on the outer periphery to form a gap between adjacent constraint members. The dislocation conductor wound in a manner to be opened is wound in a cylindrical shape, and a lead portion drawn out from the dislocation conductor to the outer diameter side is shafted by an insulating spacer interposed between turns of the dislocation conductor. Induction windings characterized by being held down from both sides of the direction. 2. An induction winding according to claim 1, wherein
An induction electric winding, wherein an insulating vertical duct which is long in the axial direction is arranged along the inner diameter side of the dislocation conductor, and the spacer is engaged with the vertical duct. 3. The induction motor winding according to claim 1, wherein the spacer is used in common with an insulating gap material arranged at a predetermined pitch in a circumferential direction between turns of the dislocation conductor. Induction motor winding.