JPS6242515Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an insulating device between wires and rings of an external iron transformer.

FIG. 1 shows the core and wire structure of the outside iron type transformer. In the figure, 1 indicates the core, and 2 indicates an insulator group including the wire 3. FIG. 2 shows an example of a conventional inter-ring insulation configuration, with FIG. 2A showing a cross section corresponding to the line XX in FIG. 1, and FIG. 2B showing a cross section corresponding to the line YY in the same FIG.

In other words, the conventional inter-ring insulation configuration
Inserting one insulating plate 4 shown in the third figure between the wire rings 3, and covering each wire ring 3 with a channel-shaped insulator 5 on the side where the lead tangent between the wire rings 3 is not made. It has an insulated structure.
The role of the insulation structure here is to provide an insulating function so as not to cause electrical breakdown due to the potential difference generated between the two wire rings 3, and to circulate a refrigerant such as insulating oil between the wire wires 3. The purpose is to form a duct to

On the other hand, with the recent improvement in heat resistance of insulators,
In some cases, it may be possible to use the coils 3 without forming individual cooling ducts without any particular cooling problems, and in this case, there is no need for a cooling duct between the two coils as long as there is no problem with the insulation. However, in the conventional insulation configuration shown in FIG. 2, the distance between the two wire rings 3 is equal to the thickness of at least one insulation plate 4 and the two insulation channels 5, Therefore, there was a problem in that the weight of the iron core 1 could not be effectively reduced, and the dimensions had to be larger than those required for functionality.

The present invention was made with the aim of improving the above-mentioned conventional problems.When two opposing wire wheels are connected at their innermost turns, The outer end of the insulating plate inserted between the wire rings on the side where the iron core is located on the outer periphery of the wire ring is bent so as to wrap around the outer periphery of one of the wire rings, and the iron core is placed on the outer periphery of the wire ring. To provide an inter-ring insulating device for an outside iron type transformer, characterized in that the outer end of the insulating plate on the side where there is no insulating plate is configured to be longer than the length of the wire so that creepage distance can be maintained.

The present invention will be explained below with reference to the embodiments shown in FIGS. 4 and 5, using the same reference numerals for parts common to those in FIG. 2.

Figure 4A shows the insulating device according to the present invention in Figure 1X-
FIG. 4B shows a cross section corresponding to the X-ray line, and FIG. 5 shows the insulating plate according to the present invention.

As shown in Figure 4 above, the lead connection is
Between the #1 wire wheel and #2 wire wheel and between the #3 wire wheel and #4 wire wheel at the innermost circumference of the
The structure is such that only one insulating plate 6 as shown in the figure is inserted. This insulating plate 6 has side walls 6a, 6 that stand up at right angles so as to wrap around the wire ring 3 at both ends thereof.
A bent portion is formed of the side walls 6a, 6a, and folded pieces 6b, 6b bent inward from the tips of the side walls 6a, 6a.

Therefore, by interposing the ends of the coil 3 in the bent portion of the insulating plate 6, a sufficient creepage distance can be secured at the outer peripheral portion of the coil 3. In addition, since only one insulating plate is required to be inserted between the wire rings 3, an insulating structure can be easily obtained without requiring a distance between the wire rings greater than the required insulation thickness.

As described above, in the winding insulation structure of an external iron type transformer, when two opposing wire rings are connected at their innermost turns, the present invention can be inserted between these two wire rings. The outer end of the insulating plate on the side where the iron core exists on the outer periphery of the wire ring is bent so as to wrap around the outer periphery of one of the wire rings, and the insulation plate on the side where the iron core does not exist on the outer periphery of the wire ring. By configuring the outer edge of the plate to be longer than the length of the wire so that the creepage distance can be maintained, it is possible to secure a sufficient creepage distance at the outer periphery of the wire, and it is possible to insert only one insulating plate between the wires. Since it is only necessary to insert the wires, there is no need for the distance between the wires to be greater than the required insulation thickness, the H dimension in FIG. 1 can be significantly reduced, and the weight of the iron core can be effectively reduced.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the configuration of the iron core and wire ring group of an external iron type transformer, Figure 2 shows the conventional insulation structure between the wire rings, and Figure 2A is taken along the line X-X in Figure 1. Fig. 2B is a corresponding sectional view taken along the line Y-Y, Fig. 3 is a perspective view showing a conventional insulating plate, and Fig. 4 shows an embodiment of the inter-ring insulation device according to the present invention. 4A is a sectional view corresponding to the line X--X in FIG. 1, FIG. 4B is a sectional view corresponding to the Y-Y line in FIG. 1, and FIG. 5 is a perspective view showing an example of the insulating plate in the present invention. 1... Iron core, 2... Insulator group, 3... Wire ring, 6
...Insulating plate, 6a...Side wall, 6b...Folded piece. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Scope of utility model registration request] In an inter-ring insulation device for an external steel transformer, in which an insulating plate is inserted between opposing wire rings to which the innermost turn of a plurality of wire rings constituting a coil is connected, an iron core is placed on the outer periphery of the wire ring. The outer end of the insulating plate on the side where the iron core is present is bent so as to wrap around the outer periphery of the one wire ring, and the outer end of the insulating plate on the side where the iron core is not present on the outer periphery of the wire ring is set to have a creepage distance. 1. An inter-ring insulating device for an external iron transformer, characterized in that the wire is longer than the above-mentioned wire so as to maintain the above-described length.