JPH07201614A - Tighening method for transformer winding - Google Patents

Abstract

PURPOSE:To provide a transformer excellent in strength and having a grounding electrode of good profile in which the lead wire and lead tap wire of winding can be supported or arranged easily while allowing reduction in size and cost. CONSTITUTION:A winding stopper 5 and a tightening seat 8 for winding are arranged above a winding 3 wound around the leg part of a laminated core of magnetic steel plate. A common jack receiver 4 welded with a boss 6 for transmitting load to the winding stopper 5 is then inserted hollow tubular metals 2 for tightening the winding having square cross-section disposed on the opposite sides of the leg part of the core. Jacks 9 are arranged on the common jack receiver 4 and the winding is tightened with predetermined compression force. A winding spacer 10 is then inserted into a gap between the winding stopper 5 and the winding tightening seat 8 for passing the boss 6 of the common jack receiver 4 and the spacer 10 is secured in place. Subsequently, the jacks 9 are released and removed along with the common jack receiver 4 and then the winding 3 is tightened by means of the tightening metal 2 through the tightening seat 8, the spacer 10 and the stopper 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for tightening a transformer winding.

[0002]

2. Description of the Related Art In a winding of a transformer, a short-circuit current flows in the winding when a short-circuit accident occurs, and a large electromagnetic mechanical force is generated. Therefore, a winding support structure that sufficiently withstands this mechanical force is required. Is. For this reason, a winding clamp is provided to clamp the winding in the axial direction.

As a conventional method for uniformly tightening the winding of the transformer, there is a method of applying a compressive force to the winding with a jack and tightening the winding with a tightening bolt.

FIG. 6 is a front view of a main part showing an example of a conventional method for tightening a transformer winding, and FIG. 7 is a side view of the main part. In FIGS. 6 and 7, an iron core formed by laminating magnetic steel plates is used. The iron core is fastened and fixed to the yoke portion 1 in the stacking direction by a fastening member 21 having a U-shaped cross section. Then, the jack 9 provided between the tightening fitting 21 and the winding 3 is operated to apply a predetermined compressive force in the axial direction of the winding 3.

Next, the winding 3 is tightened via the winding tightening seat 23 by the tightening bolts 22 attached to the tightening fittings 21. Then, by opening the jack 9,
The compressive force of the jack 9 is replaced by the tightening bolt 22, and the tightening bolt 22 causes the winding 3 to pass through the winding tightening seat 23.
Is tightened.

[0006]

However, in such a conventional structure and method, as the diameter of the winding increases, the force for tightening the winding also increases. Therefore, it is necessary to make the size of the fastening metal fitting large enough to withstand the force. In addition, the jack may have to use one rank higher.

The present invention has been made in view of the above points and has a large strength and a good shape as a ground electrode.
It is an object of the present invention to provide a transformer in which winding lead wires and tap lead wires can be easily supported and arranged, and which can be downsized and reduced in cost.

[0008]

In order to achieve the above-mentioned object, a method for tightening a transformer winding according to the present invention comprises a hollow and tubular tightening metal fitting having a rectangular cross section, which is used for holding a winding. Insert a common jack bridge welded with a boss that transmits a load, place the jacks on the common jack bridge side by side, tighten the windings with a specified compression force, and tighten the windings through which the boss of the common jack bridge passes. After inserting and fixing the winding spacer in the gap between the seat and the wire retainer, open the jack to remove the jack and the common jack receiver, and replace the compression force of the jack with the winding spacer to secure the winding. tighten.

[0009]

In the configuration of the present invention, the winding is tightened by the common jack receiver with a predetermined compression force, the winding spacer is inserted and fixed in the gap between the winding retainer and the winding tightening seat, and then the jack is opened. Then, the jack and the common jack receiver are removed, the compressive force of the jack is replaced by the winding spacer, and the winding is tightened.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an embodiment of the transformer winding tightening method of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view of an essential part showing the structure of a winding tightening device in an embodiment of a method for tightening a transformer winding of the present invention, and FIG. 2 is a side view of the essential part. In the figure, 1 is a yoke portion of an iron core formed by stacking magnetic steel sheets and tightening them by binding winding, etc. 2 is a hollow cylinder having a quadrangular cross section
In the winding fastening member, the fastening member 2 is arranged so that the long side portion faces the yoke portion 1 of the iron core, and the short side portion faces the winding 3.

A common jack receiver 4 capable of collectively tightening the windings 3 of each phase (U, V, W) is inserted inside the box-shaped winding tightening fitting 2. A boss 6 that transfers a load to the winding retainer 5 is welded to the lower side of the common jack receiver 4.

A winding retainer 5 is provided above the winding 3 wound around the iron core, and a winding tightening seat 8 having a hole 7 through which the boss 6 of the common jack receiver 4 penetrates is provided in the central portion. Jack 9
After the winding wire 3 is tightened by, the winding spacer 10 is inserted between the winding presser 5 and the winding tightening seat 8.

Next, the structure of the tightening metal fitting of the embodiment of the tightening method for the transformer winding of the present invention will be described with reference to the drawings.

FIG. 3 is a front view showing an example of the winding fastening fitting of FIG. 1, FIG. 4 is a side view of the fastening fitting of FIG. 3 seen from the direction of arrow A in FIG. 3, and FIG. 3 is a partial view of the winding tightening seat viewed from the direction of the arrow B in FIG. 3, and in FIGS. 3 to 5, each phase (U ，
A common jack receiver 4 capable of collectively tightening the V, W) windings 3 is inserted, and a boss 6 for transmitting a load to the winding retainer 5 is welded below the common jack receiver 4. A winding tightening seat 8 having a through hole 7 through which the boss 6 of the common jack receiver 4 penetrates is welded to the short side of the winding tightening metal fitting 2 facing the winding 3. .
The winding tightening seat 8 is provided with a bolt hole 11 for fixing the winding spacer 10, and the winding spacer 10 is fixed with a fixing bolt 12 inserted in the bolt hole 11. As shown in FIG. 2, the winding tightening metal fittings 2 are arranged on both sides of the yoke portion 1 of the iron core, and are connected and fixed to the lower tightening metal fittings by connecting bolts (not shown) that pass between the winding wire and the iron core. It
Further, at both ends of both winding tightening metal fittings 2, a connecting metal fitting is interposed between the surfaces facing each other, and this connecting metal fitting and both winding tightening metal fittings 2 are fixed by bolts.

Next, the method for tightening the transformer winding of the present invention will be described. The jacks 9 are lined up on the common jack receiver 4 inserted inside the winding tightening fitting 2, and the winding 3 is tightened with a predetermined compression force. The compressive force of the jack 9 tightens the winding retainer 5 via the boss 6 to tighten the winding 3 in the axial direction.

When the tightening work is completed, the winding retainer 5
A gap is created between the winding tightening seat 8 and the winding tightening seat 8. The winding spacer 10 is inserted and fixed in this gap without any gap. Finally, the jack 9 is opened, the jack 9 and the common jack bridge 4 are removed, and all the tightening work is completed.

In this way, the winding 3 has the winding tightening seat 8,
It is fastened by the winding fastening fitting 2 via the spacer 10 and the winding retainer 5.

[0019]

As described above, according to the tightening method of the transformer winding of the present invention, (1) since the jack is installed inside the tightening fitting, the size of the tightening fitting becomes large. Does not affect the installation of the jack.

(2) By eliminating the tightening bolts,
The front surface of the tightening bracket can be effectively used for mounting cleats that support internal lead wires.

(3) Since the winding tightening metal fittings are box-shaped, the strength increases with the same occupied volume.

(4) The four corners of the box are smooth, the shape of the ground electrode is good, and the winding lead wires and tap lead wires are easily supported and arranged. Cost can be reduced.

Excellent effects such as the above can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of essential parts showing the configuration of an embodiment of a method for tightening a transformer winding according to the present invention.

FIG. 2 is a side view of a main part of FIG.

3 is a front view showing an example of the tightening metal fitting of FIG. 1. FIG.

FIG. 4 is a side view of the tightening metal fitting of FIG. 3 viewed from the direction of arrow A in FIG.

5 is a partial view of the winding fastening seat of FIG. 3 seen from the direction of arrow B in FIG.

FIG. 6 is a main part front view showing an example of a conventional transformer winding tightening method.

7 is a side view of the main part of FIG.

[Explanation of symbols]

 1 ... Yoke part of iron core 2 ... Winding clamp 3 ... Winding 4 ... Common jack receiving 5 ... Winding retainer 6 ... Boss 7 ... Through hole 8 ... Winding tightening seat 9 ... Jack 10 ... Winding spacer 11 ... Bolt hole 12 ... Bolt

Claims (1)

[Claims] 1. A winding retainer and a winding tightening seat are arranged above a winding wound around a leg portion of an iron core formed by laminating magnetic steel sheets, and the winding is wound on both sides of a yoke portion of the iron core. Arrange wire tightening metal fittings,
In the transformer in which the winding is fastened and fixed by the winding tightening fitting, the winding tightening fitting is formed in a tubular shape with a hollow section having a quadrangle, and a load is applied to the winding retainer inside the winding tightening fitting. A common jack bridge having a welded boss is inserted, the jacks are arranged side by side on this common jack bridge, the windings are tightened with a predetermined compression force, and then the boss of the common jack bridge passes through. A transformer winding characterized by inserting a winding spacer into the gap between the tightening seat and the winding retainer and fixing it, then opening the jack to remove the jack and the common jack receiver and tightening the winding. Attaching method.