JPS581526B2 - Bushing pocket for stationary induction appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pushing pocket for a stationary induction electric appliance, and more particularly to a structure of a pushing pocket for a stationary induction electric appliance such as a transformer.

In recent years, as the capacity of electrical appliances has increased, the current flowing through the lead wires connected to the bushings has become thicker, and local overheating in the bushing mounting plate provided on the tank has become a problem.

As shown in FIG. 1, three busbar boxes 2 are conventionally disposed above a bushing pocket 1, and each of the busbar boxes 2 is connected by a wind tunnel 4 to provide a forced cooling system that passes through the jacket 3. wind 1
2 flow paths were formed to cool the inside of the bus box 2.

However, as shown in FIG. 2, since the lead wire 5 passes through the bushing pocket 1, when a lead current 10 flows through the lead wire 5, an eddy current 1 opposing the lead current 10 is generated.
1 flows to the side plate 1b as shown by the arrow, and the eddy current 11 is shunted to the bushing mounting plate 1a welded to the side plate 1b.

This shunted eddy current 11 flows concentratedly through the lead wire phase portion 1c protruding from the side plate 1b of the bushing mounting plate 1a, so in the conventional bushing pocket, the inside of the busbar box 2 is cooled by the cooling air 12. However, there has been a drawback that the lead wire interface portion 1c protruding from the side plate 1b of the pushing mounting plate 1a is locally overheated.

1. An object of the present invention is to provide a bushing pocket for a stationary induction electric appliance that eliminates the drawbacks of the prior art described above and can effectively prevent local overheating of the portion of the bushing mounting plate protruding from the side plate constituting the bushing pocket. It is in.

The present invention provides a method for attaching at least two busbar boxes to the protruding end lip of a bushing mounting plate whose end protrudes from the side surface of a bushing pocket provided in a part of a tank that houses the contents of equipment consisting of an iron core and windings. The initial objective was achieved by covering the inside of the communication busbar box with a wind tunnel that allows cooling air to pass through.

The present invention will be described in detail below based on embodiments shown in the drawings.

Incidentally, the same reference numerals are used for the same parts as in the past.

FIG. 3 shows an embodiment of the invention.

1 to 5 shown in the figure, in this embodiment, a wind tunnel is installed across the busbar box 2 and the side plate 16 of the bushing pocket 1 so as to cover the end of the bushing mounting plate 1a that constitutes a part of the bushing pocket 1. 4 is connected.

FIG. 4 is a cross-sectional view taken along A-1 in FIG. This eddy current 11 flows opposite to the current 10, and is shunted to the bushing mounting plate 1a, and further flows through the lead wire interphase portion 1c of the pushing mounting plate 1a located outside the side plate 1b.

However, in this embodiment, since the wind tunnel 4 is connected across the busbar box 2 and the side plate 1b so as to cover the end of the bushing mounting plate 1a, the cooling air 12 flowing through the outer cover 3 is transmitted to the bushing mounting plate 1a. 1a, the lead wire interphase portion 1c of the bushing mounting plate 1a can be strongly removed, and local overheating can be effectively prevented.

FIG. 5 shows a second embodiment of the invention.

In this embodiment as well, the end of the bushing mounting plate 1a is covered with a wind tunnel 4, and the wind tunnel 4 is made of a conductive material.
The wind tunnel 4 is electrically connected to b.

By doing this, the eddy current 11 flowing opposite to the lead current 10 is diverted to the wind tunnel 4, and the eddy current 11 in the lead interphase portion 1c of the psossing mounting plate 1a is diverted to the wind tunnel 4.
1 concentration is prevented, and the effect of preventing local overheating is further improved.

The effect of forced cooling of the end portion of the bushing mounting plate 1a is as described above.

FIG. 6 shows a third embodiment of the present invention.

In this embodiment, since the lead wire 5 is bent at the lead wire phase part 1c of the bushing mounting plate 1a on the side of the jacket 3, eddy current is more likely to concentrate than in the lead wire phase part on the opposite side of the jacket 30. , there is a high risk of local overheating.

Therefore, by making the wind tunnel 4a on the side of the jacket 3 larger than the wind tunnel 4b located on the opposite side of the jacket 30, more cooling air 12 can flow through the lead wire interphase part 1c of the bushing mounting plate 1a on the side of the jacket 3. The cooling effect has been further enhanced.

According to the above-described pushing pocket for a stationary induction electric appliance of the present invention, the pushing mounting plate whose end protrudes from the side surface of the pushing pocket is provided in a part of the tank that houses the contents of the device consisting of an iron core and a winding. The protruding end is covered with a wind tunnel that connects at least two busbar boxes and allows cooling air to pass through to cool the inside of the busbar box, so that the cooling air flows around the end of the bushing mounting plate. , the part between the lead wires of the pushing mounting plate 1a can be forcibly cooled, and local overheating can be effectively prevented.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the butting pocket of a conventional static induction electric appliance, Fig. 2 is an explanatory diagram of the flow of eddy current in the conventional structure, and Fig. 3 is a perspective view of the butting pocket of the static induction electric appliance of the present invention. A perspective view showing the embodiment, FIG. 4 is taken along A-A in FIG. 3.
5 and 6 are cross-sectional views of a pushing pocket portion showing other embodiments of the present invention. 1... Pushing pocket, 1a...
Pushing mounting plate, 1b...Side plate, 1c...
... Lead wire interphase part, 2 ... Bus bar box, 3.
...Outer cover, 4...Wind tunnel, 5...
Lead wire, 6...Lead current, 11...
・Eddy current, 12...Cooling air.

Claims (1)

[Claims] 1. A bushing pocket is provided in a part of the tank that houses the contents of the device consisting of an iron core and a winding, and a bushing mounting plate is provided above the bushing pocket with an end protruding from the side surface of the bushing pocket. , and on the bushing mounting plate there are at least two busbar boxes through which a lead wire, one end of which is connected to the bushing, passes through, and the two busbar boxes are communicated through a wind tunnel. A bushing for a stationary induction electric appliance in which the inside of a busbar box is cooled by passing cooling air through a wind tunnel, wherein the wind tunnel is provided so as to cover a protruding end of the bushing mounting plate. pocket. 2. The bushing pocket for a stationary induction appliance according to claim 1, wherein the wind tunnel is formed of a conductive material, and the wind tunnel and the bushing pocket are electrically connected.