JPS608416Y2 - Waterproof structure of transformer secondary outlet part - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a waterproof structure for the secondary exit portion of a transformer.

Furthermore, it is useful as a medium-sized and small-sized power distribution transformer installed underground or semi-underground.

In recent years, underground power distribution systems have become commonplace in urban centers to address issues such as aesthetics, safety, and difficulty in obtaining land, and there is a trend for subterranean equipment such as transformers to be installed underground or semi-underground.

Because of this, there is a risk that the transformer may be submerged in water, so the transformer body has a sealed structure.

FIG. 1 is a front view showing a transformer according to the prior art.

As shown in the figure, there is a bushing 2 in the transformer tank 1.
A secondary conductor 4 drawn out from the secondary bushing 3 is connected to a terminal plate 6 supported by a support 5 made of an insulator with one end fixed to the transformer tank 1. It is connected to the load side conductor 7 at the top.

At this time, the portion consisting of the secondary solar conductor 4, the load-side conductor 7, and the terminal plate 6 is watertightly covered with a waterproof bar 8.

In such prior art, the terminal board 6 has a large current capacity and is exposed to the air because work such as wiring changes is often performed due to changes in demand.

Therefore, if the terminal board 6 is immersed in water, accidents such as electrical leakage may occur.To prevent this, a waterproof cover is installed.
However, for this reason, the external dimensions of the transformer not only increase by the amount of waterproof cover 8, but also cause the transformer tank 1 and waterproof cover 8 to become larger when the transformer is submerged in water.
There is a risk that water may gradually enter through the gap between the

This is because with the waterproof cover 8, it is difficult to maintain a complete waterproof state for a long period of time due to deterioration of the watertight function due to deterioration of the packing.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide a waterproof structure for a transformer secondary exit part that has a simple structure and is completely waterproof.

The structure of the present invention, which is distantly related to this object, is that two ends of a transformer are supported by an insulating support whose one end is fixed to the transformer tank, and are connected on a terminal plate located outside the transformer tank. The second output conductor and the load-side conductor are covered from above by a water-impermeable cap with an open bottom end.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a partially cutaway front view showing the waterproof structure of the secondary exit portion of the transformer according to the present invention immersed in water.

As shown in the figure, the terminal plate 6 is vertically supported by a support 9 made of an insulating material and one end of which is fixed to the transformer tank 1.

A secondary solar conductor 4 is drawn out from a secondary bushing 3 provided in the transformer tank 1.

The secondary outlet conductor 4 and the load-side conductor 7 extend from below the terminal plate 6 and are connected on the terminal plate 6.

A portion including the terminal plate 6 and consisting of the secondary output conductor 4 and the load-side conductor 7 is covered from above by a water-impermeable cap 10 having a size and shape that does not contact the terminal plate 6.

This cap 10 has an open lower end and is removably fixed to the support 9 via a mounting frame 11 provided at the lower end with a band or screw.

At this time, even if the transformer is flooded with water 12, the cap 10
The buoyancy prevents it from falling off easily.

In such a waterproof structure of the transformer secondary portion, even if the transformer is submerged in water, the terminal board 6 portion is prevented from being submerged by the air within the cap 10.

Therefore, even in the event of flooding, normal operation can be continued without the risk of electrical leakage.

Further, since the cap 10 is detachably fixed, the cap 10 can be removed when changing wire connections or the like.

At this time, if the cap 10 is made of a transparent and flexible material, the work efficiency during attachment and detachment is improved, and there is an advantage that the internal situation can be observed even when the cap 10 is attached.

As explained above in detail with the embodiments, according to the present invention, the secondary solar conductor and the load side conductor connected on the terminal board are covered by the cap, so that the transformer is not submerged in water. Since water cannot enter the cap, the secondary solar conductor is completely waterproof.

Moreover, there is no need to increase the external dimensions of the transformer.

Additionally, the present invention is cheaper to manufacture than prior art structures.

[Brief explanation of drawings]

FIG. 1 is a front view showing a waterproof structure of a secondary sunrise part according to the prior art together with a transformer, and FIG. 2 is a front view showing a waterproof structure of a secondary sunshade part of a transformer according to an embodiment of the present invention when immersed in water. FIG. In the drawing, 1 is a transformer tank, 4 is a secondary conductor, 6 is a terminal board, 7 is a load side conductor, 9 is a support, and 10 is a cap.

Claims (1)

[Scope of utility model registration request] The lower end connects the secondary solar conductor of the transformer and the load-side conductor, which are supported by an insulating support with one end fixed to the transformer tank and connected on a terminal plate located outside the transformer tank. A waterproof structure for the secondary exit part of a transformer, which is covered from above by an open water-impermeable cap.