JPS60944B2 - transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to transformers, and more particularly to the cooling of their tongue cores.

- Figures 1 to 3 are all diagrams showing the structure of the tongue core of a conventional transformer. 201 is a gap provided in the tongue core, and 4 is a hole 4 provided in the upper part of the tongue core 2.
1 is a tongue wedge with a T-shaped cross section, 5 is a tongue support 3, an electromagnetic shield is attached to the tongue wedge 4, 6 is a winding wound around the iron core 2, and 7 and 8 are inserted between the tank and the iron core 2. A lower spacer and an upper spacer 9 made of an insulating material are obstructions that prevent the tongue core cooling medium from flowing into other flow paths.

In the conventional transformer configured as described above, the cooling medium such as V-oil is passed from the bottom of the tank to the flow path 10 formed by the evening support 3, the electromagnetic shield 5, and the winding 6, as shown by the solid line arrow. The tongue core gap 2011 is then reached from the hole 301 in the tongue support, and the tongue core 2 is cooled, and then from the hole 401 in the tongue wedge 4 through the flow path 11 constituted by the tongue wedge 4, the haze magnetic shield 5, and the winding 6. It was flowing into the upper tank. The tongue core cooling channel of this conventional transformer has a long channel length, so the core 2
When the length L is long or when the heat generation density of the iron core 2 is high, a sufficient cooling flow rate cannot be obtained, and there is a risk that the temperature of the tongue iron core will rise beyond the limit.

Furthermore, since the flow of the cooling medium is symmetrical, the cooling medium tends to stagnate in the center of the tongue core, resulting in various drawbacks such as poor cooling efficiency. The present invention aims to eliminate these drawbacks of the conventional ones and to obtain a sufficient cooling flow rate to keep the temperature rise below the limit even when the length of the iron core and the heat generation density become large.

An embodiment of the present invention will be described below with reference to FIGS. 4 and 5.

That is, in FIGS. 4 and 5, 1 to 8, 201, 3
01, 401 indicates the same or corresponding portions as those in FIGS. 1 to 3. 101 is a tongue core 2 provided in the tank 1;
A cooling medium introduction pipe for supplying the cooling medium to the gap 201, 102 is a cooling medium outlet pipe provided in a portion of the tank 1 facing the pipe 101, and 12 is a pipe arranged between the tank 1 and the iron core 2. A blockage that restricts the flow of cooling medium.

In such a structure, for example, if a pump is provided in the piping 101 of the tank 1 and the cooling medium is forced to flow in the length direction of the evening core 2 as shown by the solid arrow, the desired cooling flow rate can be secured. , and the gap 201 of the tongue core 2
Since there is no stagnation in the flow, the temperature rise value of the transformer can be reduced.

In this embodiment, the pipes 101 and 102 are attached to the tank 1 to obtain the flow rate, but the same effect can be expected even if an inlet and an outlet for the cooling medium are provided in the gap between the tongue cores.

As described above, the transformer according to the present invention has an iron core around which windings are wound, disposed in a cooling medium, and allows the cooling medium to flow through the gap provided in the iron core by a pressure difference. Cooling efficiency becomes better and characteristics improve.

Brief explanation of the drawings Figure 1 is a sectional view showing a conventional transformer;
Figure 2 is a cross-sectional view along the Rolo line in Figure 1, and Figure 3 is a cross-sectional view along the line m-m in Figure 1.
A line sectional view, FIG. 4 is a sectional view showing an embodiment of the present invention,
FIG. 5 is a sectional view taken along line V-V in FIG. 4.

In the figure, 1 is the tank, 2 is the tongue core, 3 is the tongue support, 4 is the tongue wedge, 5 is the electromagnetic shield, and 6 is the winding.
7 is a lower part, 8 is an upper part, 9 is an obstruction,
10 and 11 are channels, 101 and 102 are pipes, 12 is a blockage, and 13 is a pipe. Note that the same reference numerals in the figures indicate the same or equivalent parts. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. The tank is housed in the tank and is provided with piping for introducing the cooling medium and piping for leading it out, which face the openings on both sides of the gap formed in the tongue core around which the coil is wound. transformer.