JPS6211762B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a static induction electrical winding, and more particularly to a multilayer cylindrical or multilayer rectangular cylindrical winding.

In general, multilayer cylindrical windings are constructed by concentrically arranging many layers of conductors arranged in the winding axis direction, and can be used as windings for stationary induction appliances regardless of the size of capacity, voltage, or current. Used relatively widely. Such a winding structure is suitable for high voltage and
When used in small current equipment, the number of turns is large and the conductor is thin, so it is necessary to equalize the heat flow density (heat radiation density per unit area on the winding surface) of each winding block, that is, the primary and secondary windings. It is relatively easy to select an even number of layers. If the number of winding layers is even, the ends of the winding can be led out from the same side. However, if the voltage is low and the current is large, the number of turns is small and the conductor is thick. Therefore, for example, when trying to obtain the same heat flow density as the primary winding, the secondary winding may have an odd number of layers. In particular, it is necessary to provide oil pipes between each layer for cooling.
Moreover, when the number of layers is small, it may be advantageous in terms of space factor and the like to select an odd number of layers in relation to the conductor shape, structure, uniformity of cooling effect with other windings, etc.

By the way, when the winding has an odd number of layers like this, the end and start of the winding are as long as they are continuous,
They do not match downward, and therefore, when leading in the same direction, it is necessary to route one of the lead wires inside or outside the winding. Furthermore, when the current is relatively large in such a device, the end portion of the winding is routed, which impairs workability and reduces the space factor of the winding.

FIG. 1 is a sectional view showing an example of a conventional winding wire, in which the secondary winding has a three-layer structure, and the winding start lead and winding/end winding leads are drawn out above the winding. In other words, the primary winding 2 and the 4 wires connected in parallel to the iron core 1
It is constructed by incorporating a three-layer secondary winding 4 in which a conductor 3 is wound. The lead wire 5 on the winding start side passes through the inner oil passage 8 of the secondary winding 4 and is pulled out to the upper part.
It is pulled out to the top of the winding together with the lead wire 6 at the end of the winding. Each layer of the secondary winding 4 has its peripheral surface facing the oil passage 7 formed between the layers and the oil passage 8 on the inside and outside of the secondary winding 4, thereby making the heat flow density uniform.

However, in such a device, a space is required for drawing out the lead wire 5 on the winding start side, which reduces the space factor of the entire winding 4 and worsens workability. ing.

The present invention was made in order to eliminate the above-mentioned drawbacks, and by changing the cross-sectional arrangement of the conductor of a specific layer with respect to other blocks, uniformity of heat flow density can be obtained, and it can also be applied to both the beginning and end of the winding. It is an object of the present invention to provide a stationary induction electric device winding that can lead out the windings in the same direction.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the sectional view shown in FIG. Primary winding 10 on iron core 9
The secondary winding 13 that is incorporated with the
General layers 11 and 4 wound in a two-row configuration
It has a specific layer 12 in which book conductors a, b, c, and d are wound in a four-row configuration in one stage as shown in the cross-sectional view of FIG. This specific layer 12 is divided into two layers in the radial direction, and one layer (left side in the figure) has the winding wire wound in the forward direction (from the bottom side to the top side in the figure), and the other layer (the right side in the figure) The winding wire is wound in the backward direction (from the upper side to the lower side in the figure). Note that it is naturally possible to make all the layers have the same winding structure as the specific layer 12, but in this case, the space factor in the axial direction of the winding will decrease, and it will be necessary to insert an interlayer insulator. As the number of locations increases, the space factor in the radial direction also deteriorates. Therefore, it is preferable that the winding structure divided into two layers be applied to a specific layer, and only to one layer. Therefore, both the winding start lead 14 and the winding end lead 15 can be pulled out from the upper side. Furthermore, each layer is composed of two conductors in the radial direction, so that the heat flow density with respect to the oil pipe 16 is almost uniform.

As a result, the heat flow velocity in each layer can be made almost uniform, thereby making it possible to make the temperature rise of the windings in each layer almost constant, and the lead wires are in the same direction, so there is no need for space to draw out the lead wires, and the space factor of the windings is This makes it possible to reduce the size and weight of equipment.

In the above embodiment, an example was shown in which the size of the conductor is the same and the arrangement of the conductor is changed, but the same effect can be obtained by changing the shape of the conductor. Further, although the specific layer is applied to the intermediate layer, the same effect can be obtained even if the specific layer is applied to the layer at the beginning or end of the winding. Further, not only the secondary winding but also the primary winding may be provided with a specific layer as long as the number of layers is an odd number.

As described in detail above, in a device in which a plurality of conductors are connected in parallel to form an odd number of layers, a specific layer is divided into two layers in the radial direction, and a winding is wound in the forward direction on one layer. Since the windings are wound in the opposite direction on the other layer, the lead wires can be led out from the same side, and the space factor of the windings is good, making the temperature rise uniform and creating a compact and lightweight stationary induction. Electrical windings can be provided.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing an example of a conventional three-block winding structure, FIG. 2 is a cross-sectional view of a winding structure showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of the general layer shown in FIG. The cross-sectional view, FIG. 4, is a cross-sectional view of a particular layer of FIG. 9... Iron core, 10... Winding (primary), 11... General layer, 12... Specific layer, 13... Winding (secondary), 14,
15...Output lead line, 16...Oil road.

Claims (1)

[Claims] 1 In a stationary induction electric winding constructed by connecting multiple conductors in parallel to form an odd number of layers, at least one layer is divided into two layers in the radial direction so that the winding start and end of the winding are led out to the same side. A static induction electric winding characterized in that the conductor of one layer is wound in the forward direction, and the conductor of the other layer is wound in the backward direction.