JPH0577166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to tap windings of transformers, and more particularly to tap windings of transformers formed from inner and outer cylindrical windings.

[Background of the invention]

In transformers, tap windings with multiple taps are usually used to adjust the voltage on the primary or secondary side. Tap windings have impedance determined by the system requirements for connecting transformers, so there are restrictions on the winding arrangement around the core.

In general, tap windings are often placed on the outermost side of inner iron type transformers in order to draw out multiple taps, but as mentioned above, due to impedance value constraints, tap windings are often placed in series. It may have to be placed inside the main winding. In this way, the tap winding placed inside the main winding is, for example, a single tap winding formed by winding multiple conductors into a cylindrical shape.
two cylindrical windings or two connected in series
Stages or inner and outer cylindrical windings are used (see Japanese Patent Publication No. 59-29129).

A tap winding consisting of inner and outer cylindrical windings is formed as shown in FIG. In other words, the number of conductors wound in the tap winding 1 changes depending on the number of taps to be drawn out. For example, in this example, the number of conductors wound is 8.
To make a tap, line up 8 conductors in the axial direction, start winding at the top (or bottom) in the axial direction, and make one turn (1T) to n/2 turns (n/2T) in a spiral shape.
The first inner cylindrical winding 2A is wound around the outer side of the first inner cylindrical winding 2A, and the first inner cylindrical winding 1A is wound around the outside of the first inner cylindrical winding 1A from n/2+1 turns (n/2+1T) to n turns (nT). The second formed
It is composed of an outer cylindrical winding 2B.
The beginning and end of the winding are grouped together, 8 wires at the beginning of winding 12, 13...18, 13' at the end of winding,
Eight conductors of 14' and 20', a total of 16 conductors, are pulled out at once, and each outlet 12' is connected to 13 in series, and 13' to 14, so that multiple taps are pulled out from the connection part. There is. For this reason, the dimensions of each lead-out portion have become very large, resulting in a very complicated insulation structure, especially in the case of a tap winding provided on the line side of the main winding. Furthermore, a tap current flows through the conductor at each lead-out part, causing loss and raising the temperature. However, thick insulation coatings are used to insulate the conductor from ground or other windings, and sufficient cooling is required to prevent the loss that occurs. Because the area is difficult to secure, cooling it has become extremely difficult. For this reason, countermeasures have been taken such as increasing the cross-sectional area of the conductor to reduce loss and suppress temperature rise, but this inevitably results in the equipment becoming larger.

[Purpose of the invention]

The purpose of the tap winding of the transformer of the present invention is to reduce the number of winding start and winding ends by half in the inner and outer cylindrical windings that form the transformer, thereby reducing the size, facilitating the insulation work, and improving the transformer. The aim is to achieve a smaller size change.

[Summary of the invention]

In order to achieve the above object, the present invention has an inner cylindrical winding formed by arranging a plurality of conductors in the axial direction and winding them in a cylindrical shape, and an outer side of the inner cylindrical winding by folding these plurality of conductors at the ends. A tap winding is formed from an outer cylindrical winding which is formed by winding around a cylindrical valve, and this tap winding has a winding start lead and a winding end lead drawn out from the same end side, and a winding start of the inner cylindrical winding. When connecting each conductor of the lead and each conductor of the end of the winding of the outer cylindrical winding in series in order to pull out a plurality of taps, one wire is connected to either the inner or outer cylindrical winding. The conductors are wound side by side with other conductors, thereby forming half-voltage tap windings of half-voltage taps producing half the voltage of each tap, and each half-voltage tap producing half the voltage of this half-voltage tap. In combination with a tap, the desired voltage can be switched.

[Embodiments of the Invention] The configuration of the tap winding of the transformer of the present invention will be described below as a first example.
The method of using this tap winding will be explained with reference to the drawings and FIG. 2.

The example of the tap winding 11 shown in FIG. 1 is shown as an 8-tap configuration to facilitate comparison with the conventional one described above. In this example, the inner cylindrical winding 2A has one turn (1T) of the four conductors 3 arranged in parallel in the axial direction from the upper end to the lower end.
The outer cylindrical winding 2B is formed by winding from n+1 turns [(n+1)T] to 2n turns (2nT) by folding it back on the outside. Winding start and winding end openings 13 and 14', 14 and 15'...
The four taps can be pulled out using connections like this. Then, for only the inner cylindrical winding 2A, the four conductors 3 and another conductor 4 are placed side by side in the axial direction, and these are similarly wound in n turns to form a half with the taps at the winding start opening 12 and the winding end opening 12'. A voltage tap winding 5 is formed. That is, in this tap winding 11, the inner and outer helical windings 2A,
Since the number of turns from the winding start openings 13, 14, 15, 16 to the winding end openings 14', 15', 16', 17' of 2B is 2n turns, each tap also generates a corresponding voltage, but the winding The number of windings from the beginning opening 12 to the winding ending opening 12' is n turns, which is half the above-mentioned voltage tap. Therefore,
By using a combination of this half-voltage tap and each tap that produces twice the voltage, the desired voltage can be switched without arranging a large number of conductors in parallel to form a tap winding. Therefore, the inner cylindrical winding 2A of the tap winding 11 may be wound with five conductors, and the outer cylindrical winding 2B may be wound with four conductors, so the dimensions of the lead portion are small. Therefore, the insulation design is easy, the insulation work can be halved, and the dimensions required for insulation can be significantly reduced, which is effective in reducing the size of the entire transformer winding.

An example of its use in a transformer is shown in Figure 2.
The main winding 6 has inner and outer cylindrical windings 2
Tap windings 11 consisting of A, 2B and a half-voltage tap winding 5 are connected in series. In the inner and outer cylindrical windings 2A, 2B, the half-voltage tap winding 5
Since the number of turns is twice that of the number of turns, if the voltage generated between the taps 13, 14, . Therefore, in this connection, the regulated voltage is e,
2e, 3e, etc., and the illustrated state shows that the adjusted voltage is 3e. In the tap winding 11 portion, the outlet 12' of the half-voltage tap winding 4 is connected to one contact of the switching switch 5, and the outlet 12 on the opposite side of this winding 4 is connected to the tap selector 6. The remaining contacts of the switching switch 6 are connected directly to the exemplary tap selector shown in broken lines. With such a configuration, it is possible to change the voltage as described above from the illustrated state by simply switching the switching switch 6 to the side shown by the broken line without moving the tap selector shown by the broken line.

〔Effect of the invention〕

As in the present invention, a single conductor is wound around either the inner or outer cylindrical winding to form the tap winding of the transformer, and this conductor is turned with half the normal number of turns. By using a half-voltage tap winding and using it in combination with a tap winding section made of inner and outer cylindrical windings, the number of conductor openings at the beginning and end of the winding can be reduced by almost half compared to the conventional method. Not only can the dimensions be reduced, but the insulation work can be easily performed, making manufacturing easier, and the dimensions between the windings and other windings can be significantly reduced.

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram showing a tap winding of a transformer which is an embodiment of the present invention, Fig. 2 is a wiring diagram of a transformer using the tap winding of the present invention, and Fig. 3 is a wiring diagram of a conventional transformer. FIG. 1, 11...Tap winding, 2A...Inner cylindrical winding, 2B...Outer cylindrical winding, 3, 4...Conductor, 5...Half voltage tap winding,
12, 12', 13, 20, 20'... Beginning and end of winding.

Claims (1)

[Claims] 1. An inner cylindrical winding formed by arranging a plurality of conductors in the axial direction and winding them in a cylindrical shape, and an outer side formed by folding the plurality of conductors at their ends and winding them in a cylindrical shape on the outside of the inner cylindrical winding. A tap winding is formed from the cylindrical winding, and the tap winding has a winding start lead and a winding end lead drawn out from the same end side, and each conductor of the winding start lead of the inner cylindrical winding and the outer cylindrical winding. In a device that draws out a plurality of taps by sequentially connecting each conductor at the end of the winding in series, one conductor is wound in either the inner or outer cylindrical winding in parallel with the other conductor. A tap winding of a transformer, characterized in that a half-voltage tap winding of a half-voltage tap is formed to generate half the voltage of each of the taps.