JPH0217469Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a transformer such as a voltage transformer, a capacitor type voltage transformer, and a current transformer.

When drawing out the secondary, tertiary, etc. low-pressure side lead wires of this type of transformer, as shown in FIG. lead wire,
For example, it is connected to a drawer bushing 4 that is attached to a terminal box 3 provided on the side wall of the tank 2 so as to maintain an oil-tight or air-tight state.

By the way, in the conventional drawer bushing 4, since the plurality of bushing parts 42 provided on the base 41 have the same withstand voltage as shown in FIG. were also of the same size. Therefore, the conductor 43
Since the connection position between the lead wire 5 and the lead wire 5 is on the same plane, the distance between the conductors 43 and 43 is adjusted so that the lead wire 5 and the terminal 6 such as a crimp terminal do not come into contact with each other.
The dimensions are designed taking into account the workability when connecting 3 and lead wire 5, and the distance between them is naturally long.
As a result, the drawer bushing 4 itself has tended to become larger.

In view of the above-mentioned matters, this invention arranges a plurality of bushing parts concentrically in multiple layers, and forms the insulating part of the bushing part in the inner layer to be longer than the insulating part of the bushing part in the outer layer. Connect the lead wires to the bushings on the inner layer and the bushings on the outer layer so that the tip of the conductor protruding from the insulated part of the bushing on the inner layer does not protrude beyond the insulated part of the bushing on the inner layer. By having two or more planes, the distance between each conductor can be reduced, thereby reducing the size of the drawer bushing.

An embodiment of this invention will be described below with reference to FIGS. 3 and 4. Note that parts with the same reference numerals as in FIGS. 1 and 2 indicate the same or corresponding parts.

In the embodiment, insulating parts 4 provided on both sides of the base 41
A plurality of bushing parts 42, 42' each having conductors 43, 43' communicating with the bushings 42, 44' are arranged concentrically on the base 41 in a plurality of layers (two layers in the illustrated example). The insulating part 44 of the bushing part 42 in the outer layer is made longer than the insulating part 44' of the bushing part 42' in the outer layer, and the tip of the conductor 43' protrudes from the insulating part 44' of the bushing part 42' in the outer layer. A lead wire (not shown) is made shorter than the insulating part 44 of the bushing part 42 in the inner layer and connects the conductor 43 of each bushing part 42 in the inner layer to the conductor 43' of each bushing part 42' in the outer layer. ) are connected at two or more different planes.

In addition, in the figure, 7 is a mounting hole for the drawer bushing 4. In addition, the base 41, butting parts 42, 4
2' is integrally molded with a synthetic resin such as epoxy resin with conductors 43, 43' communicating with insulating parts 44, 44'.

According to the above configuration, the connection positions of the lead wires connected to the conductor of each bushing part in the inner layer and the conductor of each bushing part in the outer layer are two different planes, and the leads of the bushing part in the inner layer The wire connection position is closer to the work surface (front) than the lead wire connection position on the outer layer, making it extremely easy to connect the lead wires.In addition, the tip of the conductor on the outer layer is shorter than the insulating part on the inner layer so that it can be connected to the outer layer. Since the insulation part of the inner layer is interposed between the lead wire connection part of the bushing part of the layer and the conductor of the inner layer, even if the distance between the conductors of the bushing part of the outer layer and the inner layer is reduced, the adjacent conductors will not be affected. It is possible to prevent the lead wires and terminals of the connecting portion from coming into contact with the conductor and lead wire connecting portion of the inner layer.

In the above embodiment, a drawer bushing made of synthetic resin was described, but the invention is not limited to this, and it goes without saying that a drawer bushing made of porcelain, for example, may also be used.

As described in detail above, according to this invention, the lead wires can be connected at different positions, and the lead wires can be connected at different positions, and the connection positions are located on the insulated parts of the adjacent bushings. In addition to making the connection work easier, the distance between the conductors can be reduced, so the drawer bushing can be made smaller. As a result, there are practical effects such as reducing the risk of oil or gas leakage from the drawer bushing of this type of shift converter.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the main parts of the transformation device, Fig. 2 is a sectional view of a conventional drawer bushing, Fig. 3 is a plan view of a drawer bushing showing an embodiment of this invention, and Fig. 4 is a sectional view of a conventional drawer bushing. FIG. 3 is a sectional view taken along line BB' in FIG. 3; 4...Drawer bushing, 41...Base, 42,
42'...butching part, 43, 43'...conductor,
44, 44'...Insulating part.

Claims (1)

[Scope of utility model registration request] A plurality of bushing parts each having a conductor connecting insulating parts provided on both sides of the base are arranged concentrically in a plurality of layers, and among the plurality of bushing parts, the inner layer of the bushing part The insulating part is formed longer than the insulating part of the bushing part in the outer layer, and the tip of the conductor that protrudes from the insulating part of the bushing part in the outer layer does not protrude beyond the insulating part of the bushing part in the inner layer. A transformation device comprising a drawer bushing in which the lead wires are connected to the bushing part in the inner layer and the bushing part in the outer layer at two or more different planes.