JPH04263406A - Molded transformer winding - Google Patents

Abstract

PURPOSE:To suppress the generation of mechanical force in axial direction, to prevent both lowering of space factor of a winding and deterioration of winding workability, and to contrive reduction in main insulation dimensions by dispersively arranging the taps of a tap part, and the part where intercoil allotment voltage becomes larger is arranged in the interfacial side. CONSTITUTION:First and fourth winding blocks 1 and 4 are composed of odd layers, and second and third winding blocks are composed of the even layers having one layer more than the layers of the blocks 1 and 4. Also, tap lead-out parts 22 and 25 are provided on the upper end 21 of the third layer from the circumference of the block 2 and on the lower end 24 of the second layer from the circumference respectively. On the other hand, tap lead-out parts 32 and 35 are provided respectively on the upper end part 31 of the second layer from the outer circumference of the block 3, and on the lower end 34 of the third layer from the outer circumference of the block 3. Tap lead-out wires 23, 26, 33 and 36 are insulatively led out from the middle part in axial direction of the blocks 2 and 3.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multilayer windings, and more particularly to the tap structure of multilayer windings for large capacity molded transformers.

0002

[Prior Art] In extra-high molded transformers, a method is adopted in which several multilayer windings are connected in series in order to ease insulation between layers and reduce potential rise at the midpoint (neutral point). .

Conventional molded transformer windings usually have a four-coil configuration, taking into consideration the space factor of the entire high-voltage winding, the voltage sharing between layers, and the workability of the winding work. A tap wire is drawn out from the section.

An example of this type of molded transformer winding is one having a winding arrangement as shown in FIG. 2, for example. In FIG. 2, in the conventional molded transformer winding, a low voltage winding 6 is wound around the outer periphery of an iron core 5, and a high voltage winding 71 is wound around the outer periphery of this low voltage winding 6. The high-voltage winding 71 is composed of four odd-numbered multilayer winding blocks that are divided in the axial direction and connected in series from the top. The upper line side terminal 8 is drawn out from the upper end 112 of the outermost layer of the first winding block 111, and the lower end 113 of the innermost layer is in series with the upper end 122 of the innermost layer of the second winding block 121. It is connected. The second winding block 121 is provided with a tap pull-out portion 124 at the lower end 123 of its outermost layer. Third winding block 131
has a tap drawer 133 at the upper end 132 of its outermost layer.
The lower end 134 of the innermost layer is connected in series with the upper end 142 of the innermost layer of the fourth winding block 141 . The fourth winding block 141 has the lower track side terminal 9 pulled out from the lower end 143 of its outermost layer, and the tap pull-out portions 124 and 1 of the fourth winding block 141 .
Tap lead lines 125 and 135 are drawn out from 33.

However, in the structure shown in FIG. 2, when the transformer capacity is large, a large axial mechanical force is generated due to deviation of the electromagnetic center due to tap removal. To prevent this, it is necessary to install taps on the top and bottom so that the wires can come out as evenly as possible.To do this, you can increase the number of coils or make the line terminal side the main insulation side.

When the line terminal side is the main insulating side, there is a winding arrangement as shown in FIG. 3. Figure 3
, a low voltage winding 6 is wound around the outer periphery of the iron core 5, and a high voltage winding 72 is wound around the outer periphery of the low voltage winding 6. The high-voltage winding 72 is composed of four odd-layer multilayer winding blocks that are divided in the axial direction of the winding and connected in series from the top. The first winding block 211 has an upper line side terminal 8 pulled out from an upper end 212 of its innermost layer, and a tap pull-out portion 214 provided at a lower end 213 of its outermost layer. The second winding block 221 is provided with a tap pull-out portion 223 at the upper end 222 of its outermost layer, and the lower end 224 of its innermost layer is connected in series with the upper end 232 of the innermost layer of the third winding block 231. has been done. The third winding block 231 is provided with a tap pull-out portion 234 at the lower end 233 of its outermost layer. The fourth winding block 241 is provided with a tap pull-out portion 243 at the upper end 242 of its outermost layer, and the lower track side terminal 9 is pulled out from the lower end 244 of the outermost layer, and the respective tap pull-out portions 214,
Tap lead lines are drawn out from 223, 234, and 243.

[0007]

However, in the structure shown in FIG. 2 as described above, when the transformer capacity is large, a large axial mechanical force is generated due to the deviation of the electromagnetic center due to tap removal. In order to prevent this, it is necessary to provide a tap on each of the upper and lower windings so that they can come out as evenly as possible.To do this, increase the number of coils,
There is a structure in which the line terminal side is the main insulation side, as shown in FIG.

[0008] A structure in which the number of coils is increased has the disadvantage that the number of coils between the coils increases, the space factor of the entire winding decreases, and the number of work steps also increases. In addition, in a structure where the line terminal side is the main insulation side as shown in Figure 3, the part where the voltage shared between the coils is large is on the main insulation side, and moreover, at the end of the winding, so the main insulation dimensions become large. This problem occurs.

The present invention has been made in view of the above points, and its purpose is to suppress the generation of mechanical force in the axial direction by eliminating the movement of the electromagnetic center due to tap removal, and to suppress the generation of axial mechanical force.
This prevents a decrease in the space factor of the winding, prevents a decrease in winding workability, and reduces the main insulation dimensions by locating a large part of the voltage shared between the coils on the outer periphery of the winding. There is a particular thing.

0010

[Means for Solving the Problems] In the molded transformer winding of the present invention, the taps in the tap portion are distributed and the winding is configured with four coils, and the portion where the voltage shared between the coils is large is placed on the interphase side. The main insulation feature is that the electric field rises in the main insulation part during grounding tests.

[0011]

[Function] According to the molded transformer winding of the present invention, the movement of the electromagnetic center due to tap removal is suppressed, the generation of axial mechanical force is suppressed, the reduction in the space factor of the winding wire is prevented, and the winding work is improved. In addition to preventing a decrease in workability, the size of the main insulation can be reduced by arranging the portion with a large voltage shared between the coils on the outer periphery of the winding.

0012

[Embodiment] FIG. 1 is an explanatory diagram of the winding arrangement and connection of the multilayer winding of a molded transformer for carrying out the present invention. In FIG. 1, the multilayer winding of the molded transformer of the present invention is A low voltage winding 6 is wound around the outer periphery of the coil 5, and a high voltage winding 7 is wound around the outer periphery of the low voltage winding 6. The high-voltage winding 7 consists of four winding blocks that are divided in the axial direction and connected in series from the top, and among the four winding blocks, the first winding block 1 is the upper part, and the first winding block 1 is the lower part. The fourth winding block 4 is composed of an odd number of layers, and the second winding block 2 and third winding block 3 in the center are one layer larger than the number of layers of the first winding block 1 and the second winding block 2. It consists of many even layers. The upper line side terminal 8 is drawn out from the upper end 10 of the outermost layer of the first winding block 1, and the lower end 11 of the innermost layer is connected to the upper end 20 of the innermost layer of the second winding block 2. connected in series. The second winding block 2 is provided with tap pull-out portions 22 and 25 at the upper end 21 of the third layer from the outer periphery and the lower end 24 of the second layer from the outer periphery, respectively.
The upper end 27 of the layer mesh and the upper end 28 of the outermost layer are connected, and the lower end 29 of the outermost layer is connected in series with the upper end 30 of the outermost layer of the third winding block 3. The third winding block 3 is provided with tap pull-out portions 32 and 35 at the upper end 31 of the second layer from the outer periphery and the lower end 34 of the third layer from the outer periphery, respectively, and the lower end 37 of the innermost layer is provided with tap pull-out portions 32 and 35, respectively. It is connected in series with the upper end 40 of the innermost layer of the winding block 4. The fourth winding block 4 has a lower line side terminal 9 pulled out from the lower end 41 of its outermost layer, and a lower line side terminal 9 is pulled out from the axial middle of the second winding block 2 and the third winding block 3. Tap lead wires 23, 26, 33, 36 from the tap lead-out parts 22, 25, 32, 35 are drawn out in an insulated manner.

[0013] The third winding block and the fourth winding block may be arranged in an odd number of layers and directly connected without a portion corresponding to the outermost layer in FIG. 3.

[0014]

As described above, according to the present invention, the taps in the tap portion are arranged in a distributed manner to eliminate the movement of the electromagnetic center due to tap dropout, thereby suppressing the generation of axial mechanical force and increasing the space factor of the winding. In addition to preventing a drop in winding work efficiency, the part where the voltage shared between the coils is large is placed on the interphase side to suppress the rise in the electric field in the main insulation part during grounding tests. Therefore, the main insulation dimensions can be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of winding arrangement and connection showing an embodiment of the molded transformer winding of the present invention.

FIG. 2 shows a conventional molded transformer winding.

FIG. 3 shows a conventional molded transformer winding.

[Explanation of symbols]

1...First winding block 2...Second winding block 3...Third winding block 4...Fourth winding block 5...Iron core 6...Low voltage winding 7...High voltage winding 8...Upper track side terminal 9...Lower Line side terminal 10...Top end 11 of the outermost layer of the first winding block...Lower end 20 of the innermost layer of the first winding block...Top end 21 of the innermost layer of the second winding block...Second winding Upper end 22 of the third layer from the outer periphery of the block...Tap lead-out portion 23 of the third layer from the outer periphery of the second winding block...Tap lead-out line 24 of the third layer from the outer periphery of the second winding block...Second winding block Lower end 2 of the second layer from the outer periphery of
5...Tap lead-out portion 26 on the second layer from the outer periphery of the second winding block...Tap lead-out line 27 on the second layer from the outer periphery of the second winding block...Upper end 2 of the second layer from the outer periphery of the second winding block
8... Upper end of the outermost layer of the second winding block 29... Lower end of the outermost layer of the second winding block 30... Upper end of the outermost layer of the third winding block 31... 2 points from the outer periphery of the third winding block Upper end of the layer 32...Tap lead-out portion 33 of the second layer from the outer periphery of the third winding block...Tap lead-out line 34 of the second layer from the outer periphery of the third winding block...Three layers from the outer periphery of the third winding block lower edge of eyes 3
5...Tap lead-out portion on the third layer from the outer periphery of the third winding block 36...Tap lead-out line on the third layer from the outer periphery of the third winding block

Claims (1)

[Claims] Claim 1: In a multilayer winding of a molded transformer, which is composed of four winding blocks that are divided in the axial direction of the winding and connected in series from the top, the top of the four winding blocks is The first winding block and the fourth winding block at the bottom are composed of odd-numbered layers, and the second winding block and third winding block at the center are composed of layers of the first winding block and the second winding block. The first winding block is composed of an even number of layers, one layer more than the number of layers, and the first winding block is led out with the upper end of the outermost layer as an upper line side terminal,
The second winding block is provided with a tap pull-out portion at the upper end of the third layer from the outer periphery and the lower end of the second layer from the outer periphery, and the upper end of the second layer from the outer periphery and the upper end of the outermost layer are connected, and the upper end of the second layer from the outer periphery is connected to the upper end of the outermost layer. The lower end is connected in series with the upper end of the outermost layer of the third winding block, and the third winding block has a tap pull-out portion at the upper end of the second layer from the outer periphery and the lower end of the third layer from the outer periphery. The fourth winding block is pulled out with the lower end of its outermost circumferential layer serving as a lower line side terminal, and the fourth winding block is pulled out from the tap pull-out portion from the axial middle of the second winding block and the third winding block. A molded transformer winding characterized by a tapped lead wire drawn out.