JP3470461B2 - Transformer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer, and more particularly, to winding tightening means for tightening a winding of a transformer.

[0002]

2. Description of the Related Art FIG. 8 is a front view showing an example of a contents main body of a transformer having a conventional winding tightening device, and FIG. 9 is a side sectional view of a main part of the contents main body of the transformer shown in FIG. As shown in FIGS. 8 and 9, the iron core leg 1 of the iron core 4 including the iron core leg 1 and the upper iron core yoke portion 2 and the lower iron core yoke portion 3 is
Winding 5 is wound around the upper core yoke 2 and the lower core yoke 3 and the upper core fastening member 21 and the lower core fastening member 22 each having a U-shaped cross section are arranged on both sides of each. , And the upper iron core yoke portion 2 and the lower iron core yoke portion 3 are tightened in the stacking direction by tightening both ends of the iron core tightening bolts 23, as shown in FIG. The iron core pressing plate 24 is attached between the upper parts of the metal fittings 21 and 21, and the iron core stand 33 is attached between the lower parts of the lower iron core tightening metal fittings 22 and 22, and the upper iron core yoke 2 and the lower iron core yoke 3 are connected. The middle part is fixed.

Further, the connecting plate 2 for connecting the upper iron core fastening member 21 and the lower iron core fastening member 22 with the connecting plate mounting bolt 25.
6 are attached and connected, and the horizontal reinforcing plate 2 is attached to each of the upper iron core fastening member 21 and the lower iron core fastening member 22.
7, a winding presser reinforcing member 29, in which a vertical reinforcing plate 28 is welded, is attached by welding.
Between the horizontal reinforcing plate 27 and the end of the winding 5, an insulating member 30 and a reinforcing insulating plate 32 are arranged between the yoke portion and the winding at the upper part of the iron core window part, and the lower part of the iron core window part is provided. , An insulating member 30 is arranged between the yoke portion and the winding, and an insulating member 31 is arranged between the iron core clamp and the winding on the outside of the iron core leg. It is tightened to form a main body, which is solid-insulated or is housed in a tank (not shown) to form a transformer.

FIG. 10 is a side view showing an insulating member 30 between a conventional iron core tightening fitting and a winding. As shown in FIG. 10, the conventional iron core tightening fitting and the insulating member 30 between windings are flat. And an insulating member 32 for reinforcement and an insulating plate 32A for adjusting the thickness, and the upper and lower iron core fastening fittings 21 and 22 and the winding 5
The thickness of the thickness-adjusting insulating plate 32A is adjusted according to the height between them.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the winding tightening device for a transformer described in the prior art, (1) when the winding-pressing reinforcing member is attached to the tightening fitting, complicated welding work is performed on the tightening fitting. Is required, and a lot of design time and work time is spent only for reinforcement.

(2) The self-weight increases in the case of the short-circuit specification, as compared with a normal tightening fitting.

(3) The outer side of the iron core window of the upper coil retainer has to be lifted up to the lower surface of the clamp (it must be assembled in a concave shape).

(4) Depending on the reinforcement on the left and right of the tightening fitting, the tightening work of the iron core tightening bolt and the connecting plate mounting bolt may be difficult.

There are problems such as the above.

The present invention has been made in view of the above problems of the prior art. It is easy to process and assemble a transformer, the number of manufacturing steps can be reduced, and the axial tightening force of the winding is reduced. An object of the present invention is to provide a transformer winding tightening means which can be freely varied and can use a standard type iron core tightening metal even with a short-circuit specification of the winding, which is advantageous for standardized design.

[0011]

Means for Solving the Problems In the present invention, a means for solving the above-mentioned problems is to form an iron core with an iron core leg laminated with silicon steel plates and upper and lower iron core yoke parts, Wind the windings on the iron core legs, and install the iron core tightening metal fittings on both sides of the upper and lower iron core yokes. In the transformer in which the main body is constructed by tightening in the winding axis direction by the attaching means, the winding tightening means comprises a substantially U-shaped winding tightening metal fitting having a predetermined width, and the bottom side thereof. The non-winding side and the free end side are arranged so as to face the winding side so as to straddle the iron core tightening metal fittings on both sides, and an insulating member is interposed between the free end and the winding, and the bottom portion and the iron core. The tightening means is provided between the tightening fittings, and the winding tightening fitting is advanced in the winding axis direction by the operation of the tightening means to tighten the winding. Than it is.

In this way, when the winding fastening member is tightened on the iron core fastening member by operating the fastening means such as the winding fastening bolt,
Since the iron core fastening member is fixed to the iron core yoke portion, only the winding fastening member is moved in the winding direction. By the movement of the winding tightening metal fitting, the winding is pressed by the insulating member on the open end side of the winding tightening metal fitting and tightened. This tightening force can be arbitrarily adjusted by tightening pressure of a tightening bolt or the like.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a contents main body according to the present invention, and FIG. 2 is a side view of a winding tightening portion according to a first embodiment of the present invention.

In these figures, except for the structure of the winding tightening portion, the structure is almost the same as that in FIGS. 8 and 9, so the same or corresponding parts in these figures are designated by the same reference numerals. And the description is omitted.

Reference numeral 11 denotes a winding fastening member, and the winding fastening member 11 is a metal member having a predetermined width w.
As shown in FIG. 3, the base portion 11a and the side portion 11b are formed by bending in a substantially U-shape, and the free end side thereof is further bent to the outside to provide the winding pressing portion 11c. This winding tightening fitting 11 is wound on the winding holding portion 11c on the free end side of the winding 5
The core tightening metal fittings 6 and 6 toward the side, and the winding tightening bolts 12 are screwed between the bottom side 11a of the winding tightening metal fitting 11 and the iron core tightening metal fittings 6 and 6. Then, by rotating the winding tightening bolt 12, the winding tightening fitting 1
1 in the vertical direction (winding axis direction) of FIG.

The insulating members 14 and 15 are insulating members.
Is disposed between the iron core yoke portion of the iron core window 1w and the winding,
The insulating member 15 is disposed between the winding and the tightening metal fitting outside the iron core. The winding tightening fitting 11 is made up of these insulating members 14
And 15 are installed at the portions where the winding holding portion 11c can press the insulating member 14 (15).

With this structure, when the winding tightening bolt 12 is rotated, the winding tightening metal fitting 11 advances to the winding side, and the winding 5 is pressed and tightened via the insulating member. .

The winding tightening fitting 11 may be provided on both the upper and lower iron core yoke portions as shown in FIG. 1, or may be provided on only one of them.

FIG. 3 is a side view of the winding tightening portion according to the second embodiment of the present invention, in which a horizontal plate member 13 is attached to the free end of the winding tightening metal fitting 11 by welding or the like, and the winding pressing portion is provided. 11c is formed. As shown in FIG. 3, if a part of the plate material 13 is also extended to the iron core yoke section side, the tightening force is applied to the middle of the winding pressing portion 11c, and the tightening force can be increased.

FIG. 4 is a side view of the winding tightening portion according to the third embodiment of the present invention, in which the side portion 11b of the substantially U-shaped winding fastening metal fitting 11 is perpendicular to the bottom portion 11a. It is provided with an inclined portion that is partially inclined from the bottom without bending.

By providing the inclined portion as described above, the size of the shoulder portion of the transformer tank can be reduced in the case of a large size, and it is effective in clearing the problem of the transportation restriction size.

FIG. 5 is a side view of the winding tightening portion according to the fourth embodiment. As shown in FIG. 5, the side of the substantially U-shaped side portion 11b of the winding tightening metal fitting 11 is located outside. The winding holding portion 11c is formed by curving in a substantially arcuate shape and horizontally bending both sides on the free end side inward. With this configuration, the same effect as that of the third embodiment can be obtained, and if the curvature of the arc portion is matched with the curvature of the tank cover portion of the transformer,
Further, the effect of size reduction can be obtained.

FIG. 6 is a side view of the winding tightening portion according to the fifth embodiment, in which the substantially U-shaped side of the winding tightening metal fitting 11 is curved inwardly in a substantially arc shape. The winding opening portion 11c is formed by horizontally bending the open end side outward. With this configuration, the work space for mounting the winding pressing portion 11c is widened, the mounting work is facilitated, and the connection space is obtained.

FIG. 7 is a side view showing an embodiment of the insulating member between the tightening member and the winding of the present invention. As shown in FIG. 7, the insulating member 15 between the tightening member and the winding is a flat insulating member. You just need a board. This is because it is not necessary to adjust the height between the iron core tightening fitting 6 or 7 and the winding, and thus there is no need for a thickness adjusting insulating plate for adjusting the thickness as in the conventional case.

[0025]

Since the present invention is configured as described above, it has the following effects.

Since the self-weight of the tightening metal fitting is reduced, the work of assembling the contents of the transformer is facilitated and the number of manufacturing steps can be reduced.

Since the reinforcing welding work for the tightening fitting can be omitted, the number of manufacturing steps can be reduced.

Since the winding holding structure is simple, it is easy to process and the number of manufacturing steps can be reduced.

Concave processing and thickness adjustment work for the tightening metal fitting-winding insulator can be omitted, and the number of manufacturing steps can be reduced.

Since the axial tightening force of the winding can be freely changed, a robust presser can be obtained.

Even if the winding is short-circuited, the standard type iron core tightening fitting can be used, which is advantageous for standardized design.

[Brief description of drawings]

FIG. 1 is a front view of a transformer contents main body according to an embodiment of the present invention.

FIG. 2 is a side view of the first embodiment of the winding tightening portion of the present invention.

FIG. 3 is a side view of the second embodiment of the winding tightening portion of the present invention.

FIG. 4 is a side view of a winding tightening portion according to a third embodiment of the present invention.

FIG. 5 is a side view of a winding tightening portion according to a fourth embodiment of the present invention.

FIG. 6 is a side view of a winding tightening portion according to a fifth embodiment of the present invention.

FIG. 7 is a side view of an insulating member between the tightening fitting and the winding wire of the present invention.

FIG. 8 is a front view of a transformer contents main body having a conventional winding tightening device.

9 is a side view of a main portion of the winding tightening portion of FIG.

FIG. 10 is a side view of a conventional iron core tightening member and an insulating member between windings.

[Explanation of symbols]

1 ... Iron core 2 ... Upper core yoke 3 ... Lower iron core yoke 4 ... iron core 5 ... Winding 6 ... Upper iron core clamp 7 ... Lower iron core clamp 8 ... Connecting plate mounting bolt 9 ... Communication plate 10 ... Winding retainer 11 ... Winding clamp 11a ... bottom part 11b ... side part 11c ... Winding retainer 12 ... Winding tightening bolt (fastening means) 14, 15 ... Insulation member

Claims (3)

(57) [Claims] 1. An iron core is formed by an iron core leg laminated with silicon steel sheets and upper and lower iron core yokes, and a winding is wound around the iron core leg of the iron core, and the upper and lower iron core yokes In a transformer in which the core body is constructed by tightening both sides of the part in the stacking direction with iron core tightening metal fittings, and by tightening winding winding tightening means in the winding axis direction at the specified locations of the windings through the iron core tightening metal fittings. The winding tightening means includes a substantially U-shaped winding tightening metal fitting having a predetermined width, the bottom side of which is opposite to the winding side and the free end of which is toward the winding side. It is arranged so as to straddle the iron core tightening metal fitting, the insulating member is interposed between this free end and the winding, and the tightening means is provided between the bottom part and the iron core tightening metal fitting, and by the operation of the tightening means. A transformer characterized in that the winding tightening metal fitting is advanced in the winding axis direction to tighten the winding. 2. The transformer according to claim 1, wherein the winding tightening fitting is substantially U-shaped and is provided with an inclined portion on a side portion rising from a bottom portion. 3. The transformer according to claim 1, wherein the winding tightening metal fitting is formed by bending a substantially U-shaped side portion outward or inward in a substantially arc shape.