JPH07307227A - Multi-winding transformer - Google Patents

Abstract

PURPOSE:To improve the cooling efficiency of upper and lower winding units, suppress the deviation of the temperature change of the upper and lower windings and reduce the sizes of the windings. CONSTITUTION:A low voltage winding 2b and a high voltage winding 2a are composed of multilayer windings or sheet windings. A winding unit is composed of the low voltage winding and the high voltage winding which are wound concentrically with each other. A plurality of the winding units are provided around the outer circumference of an iron leg 1 in an axial direction. A plurality of block spacers 3 are provided between a plurality of the winding units in the circumferential direction with a certain intervals so as to form coolant paths between the spacers 3 and 3 in order to make the coolant flow continuously in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-winding transformer having upper and lower split windings for the purpose of supplying independent power to a plurality of loads.

[0002]

2. Description of the Related Art As a multi-winding transformer used for the purpose of supplying an independent power source to a plurality of loads, a winding body in which a low-voltage winding and a high-voltage winding are concentrically wound is provided on the outer periphery of an iron core leg. There is one configured by arranging a plurality in the axial direction. A winding of this type of multi-winding transformer is formed by winding one layer while arranging the strands in the axial direction, and winding the layers in layers while forming a refrigerant passage in the axial direction between the layers if necessary. (Multiple cylindrical winding), or a winding (sheet winding) in which a sheet-shaped conductor is superposed on an insulating sheet and wound, and if necessary, a refrigerant flow path in the axial direction is formed between layers to form a layered winding. To be Cooling of the multiple cylindrical windings or sheet windings is performed by convective heat transfer of this refrigerant by causing a cooling medium such as insulating gas or insulating oil to flow in an axial refrigerant passage that is appropriately provided in the winding.

By the way, since the plurality of winding bodies arranged in the axial direction are individually wound while the coolant passage is provided in each winding, the upper and lower windings are arranged concentrically. The boundary portions of the refrigerant flow passages in the axial direction of the lines may not completely match due to an assembly error or the like, and the upper and lower refrigerant flow passages may be displaced. When the refrigerant flow path is deviated, the refrigerant flow path in the axial direction of the winding may be narrowed to hinder the flow of the refrigerant, and in the worst case, the refrigerant flow path may be blocked. For this reason, a spacing member is attached between the upper and lower winding bodies, and block-shaped spacers are arranged at intervals in the circumferential direction on the disk-shaped fixing collar. The refrigerant flow passage is prevented from becoming narrow and the flow of the refrigerant is not obstructed.

[0004]

However, in the structure of the multi-winding transformer as described above, the refrigerant passage along the axial direction of the winding body arranged in the axial direction is divided by the fixing collar. Therefore, the refrigerant flows in from the lower part of the lower winding body, flows while taking heat from the axial refrigerant flow path in the winding body, and then collides with the fixing collar to be oriented in the horizontal direction. Instead, it moves and flows out of the winding body. Cooling of the upper winding body takes the heat from the axial refrigerant passage in the winding body after the surrounding refrigerant flows in the refrigerant passage formed by the spacers on the fixing collar along the horizontal direction. It is done by flowing while flowing.

In such a structure, the winding cooling medium has a complicated flow due to the fixing collar for fixing the spacers, which reduces the winding cooling efficiency as a whole and also causes There is a problem such as large temperature variation in the winding body of, and as a result, the winding becomes large,
The increase in size of the entire transformer has led to an increase in manufacturing costs.

In view of the above points, the present invention can improve the cooling efficiency of the upper and lower winding bodies and reduce the variation in the temperature rise of the upper and lower winding bodies to reduce the size of the winding. An object is to provide a multi-winding transformer.

[0007]

A multi-winding transformer of the present invention comprises a winding body in which a low-voltage winding and a high-voltage winding composed of multiple cylindrical windings or sheet windings are concentrically wound. In a multi-winding transformer having a plurality of axially arranged outer circumferences of iron core legs, a plurality of block-shaped spacers are provided at intervals in the circumferential direction between a plurality of winding bodies, It is characterized in that a coolant flow path is formed along the axial direction of the winding between these spacers.

In this case, the spacer can be fixed by forming a groove at one end and fitting the groove into a rail with an ear provided inside the winding. Also, the spacer is fixed by pasting it on a disc-shaped fixing collar that is arranged between a plurality of winding bodies, and the fixing collar is provided with holes or cuts for the coolant passage along the axial direction of the winding. It is also possible to form a notch.

Further, the spacer is fixed by being attached to a plurality of disc-shaped fixing collars which are concentrically arranged between the plurality of winding bodies, and is wound between the plurality of fixing collars. It is also possible to form a refrigerant flow path along the axial direction of the line.

[0010]

According to the present invention, the refrigerant having passed through the refrigerant passage along the axial direction between the layers of the lower winding body is continuously passed through the refrigerant passage formed between the spacers as it is. It flows into the coolant flow path along the axial direction between the layers of the body and cools the upper winding. As a result, the upper and lower winding bodies are efficiently and uniformly cooled.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-winding transformer according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a winding structure of a multi-winding transformer of the present invention. FIG. 1 shows a multi-winding transformer with four windings, two primary windings 2a per leg.
And two secondary windings 2b magnetically coupled to these
Is equipped with. These windings are composed of multiple cylindrical windings or sheet windings in which a coolant passage 2c is formed along the axial direction, and each primary winding 2a and secondary winding 2b are paired to form a leg of the iron core 1. They are concentrically wound around the section and stacked in the axial direction. The upper and lower winding bodies are separated by a plurality of block-shaped spacers 3 arranged at intervals in the circumferential direction. As shown in FIG. 2, this spacer 3 has a dovetail-shaped groove 3a formed at one end in the longitudinal direction, and the groove 3a is fitted to the ear 4a of the rail 4 with an ear provided inside the winding. It is fixed by that.

Therefore, according to this embodiment, as shown in FIG. 1, the refrigerant which has taken away the heat passing through the axial refrigerant passage 2c of the lower winding body passes through the plurality of spacers 3 as it is. It continuously flows into the refrigerant passage 2c of the upper winding body, takes heat of the upper winding body, and flows out of the winding. Therefore, the cooling efficiency of the upper winding body is improved, and the upper and lower winding bodies are efficiently and evenly cooled, so that it is not necessary to reduce the current density of the winding unnecessarily, and the winding is generally downsized. be able to.

In the above-described embodiment, the structure in which the coolant passage along the axial direction is formed between the spacers by the combination of the spacers having the groove portions and the rails with the ears has been described. For example, FIGS. 3 (a) and 3 (b) are shown. As shown in FIG. 3, a disk-shaped fixing collar 5 is arranged between a plurality of winding bodies, and a plurality of spacers 3 are attached to the fixing collar 5 to fix the fixing collar 5 to the fixing collar 5. By forming the holes 5a for the coolant passage along the axial direction of the winding, it is possible to form the coolant passage along the axial direction. Further, instead of the hole 5a, a notch 5b may be formed as shown in FIG. Further, as shown in FIG. 4B, a plurality of disc-shaped fixing collars 5 in which spacers 3 are concentrically arranged are provided.
c, 5d, and a plurality of fixing collars 5c, 5
The gap 5e between d can also be formed as a refrigerant flow path along the axial direction of the winding.

[0014]

As described above, according to the present invention, a plurality of block-shaped spacers are provided at intervals in the circumferential direction between a plurality of winding bodies, and windings are provided between these spacers. By forming the refrigerant flow path along the axial direction of the coil, the cooling efficiency of the upper and lower winding bodies is improved, and it is not necessary to reduce the current density of the winding unnecessarily, so that the winding can be miniaturized. A winding transformer can be obtained.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a winding structure of a multi-winding transformer according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the rail and the spacer portion of FIG. 1 in a disassembled state.

FIG. 3 shows another embodiment of the spacer portion of the multi-winding transformer of the present invention, (a) is a plan view and (b) is a front view.

4 (a) and 4 (b) are plan views showing another embodiment in which the spacer portion of the multi-winding transformer of the present invention is different.

[Explanation of symbols]

1 is an iron core, 2a is a primary winding, 2b is a secondary winding, 2c is a coolant channel, 3 is a spacer, 3a is a groove, 4 is a rail, 4a is an ear, 5, 5c and 5d are fixing collars, 5a. Indicates a hole, 5b indicates a notch, and 5e indicates a gap.

Claims (4)

[Claims] 1. A winding body obtained by concentrically winding a low-voltage winding and a high-voltage winding composed of multiple cylindrical windings or sheet windings,
In a multi-winding transformer formed by arranging a plurality in the axial direction on the outer circumference of an iron core leg, a plurality of block-shaped spacers are provided at intervals in the circumferential direction between the plurality of winding bodies, A multi-winding transformer characterized in that a refrigerant flow path is formed between the spacers along the axial direction of the winding. 2. The multi-winding according to claim 1, wherein the spacer has a groove formed at one end thereof and is fixed by fitting the groove into a rail with an ear provided inside the winding. Transformer. 3. The spacer is fixed by adhering it to a disc-shaped fixing collar arranged between a plurality of winding bodies, and the refrigerant flow path along the axial direction of the winding is fixed to the fixing collar. 2. The multi-winding transformer according to claim 1, wherein a hole or a notch for forming is formed. 4. The spacer is fixed by being attached to a plurality of disc-shaped fixing collars concentrically arranged between the plurality of winding bodies, and is fixed between the plurality of fixing collars. The multi-winding transformer according to claim 1, wherein a refrigerant flow path is formed along an axial direction of the winding.