JPH0150085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bushing connection device that enables quick and reliable connection between bushings and device leads.

FIG. 1 is a cross-sectional view showing the schematic configuration of a conventional device of this type, such as a transformer or reactor.
FIG. 2 is an enlarged cross-sectional view of the connection portion shown in FIG. 1. In the figure, a coil 2 housed inside a tank 1 such as a transformer or a reactor is connected to a lower terminal 5 of a bushing 4 via a connection lead 3 drawn out from the coil 2. The bushing 4 is also fixed to a tank side mounting flange 7 through a bushing flange 6. The connection between the connection lead 3 and the lower terminal 5 of the bushing 4 is such that the fixed side 10 of the slip-in contact provided on the tip of the connection lead 3 and the movable side 11 of the slip-in contact provided on the lower terminal 5 of the bushing are connected. The connecting portion is covered with an electric field shield 8 and an insulating barrier 9 in order to alleviate the electric field at the terminal portion at high voltage and improve insulation strength.

After the bushing 4 is tested at the factory, it is removed from the transformer and reactor tank 1 and transported to the installation site to limit transportation and prevent damage. mounted on. This connection work needs to be done in a short time to prevent moisture absorption in the coil 2, electric field shield 8, insulation barrier 9, etc. of the transformer or reactor. Therefore, a slip-in contact 10 is attached to the tip of the connection lead 3 from the coil. A structure that allows easy connection work is often provided. In this case, the connection work between the bushing 4 and the connection lead 3 is carried out on the slip-in contact fixed side 10 of the connection lead 3, which is supported and fixed on the coil 2 of the transformer or reactor and covered with the electric field shield 8 and the insulation barrier 9. This is done by inserting the bushing 4 from above, engaging the slip-in contact movable side 11 provided at the bottom of the bushing with the slip-in contact fixed side 10, and then fixing the bushing flange 6 to the tank side mounting flange 7. .

However, in the conventional bushing connection device described above, the connection between the slip-in contact movable side 11 of the bushing lower terminal 5 and the slip-in contact fixed side 10 at the tip of the connection lead 3 is surrounded by the electric field shield 8 and the insulating barrier 9. The drawback was that it was difficult to confirm that the event had been completed properly because it was held in a closed space.

This invention was made in view of the above points,
The bushing connection device has a structure in which the connection lead can move freely in the axial direction, so that the connection point can be pulled out to the outside of the electric field shield, oil shield, or insulation barrier during connection to ensure a secure connection. This is what we provide.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
This will be explained with a diagram. Figures 3 and 4 are enlarged schematic cross-sectional views of the connecting parts of the equipment, with Figure 3 showing the state when the connection is completed, and Figure 4 showing the state during the connection work, respectively. . In these figures, a connecting conductor 12 is provided at the tip of the connecting lead 3 and is engaged to be movable in the axial direction. The connecting conductor 12 includes a rod-shaped portion 12a that is movable in the axial direction by sliding on the fixed side 10 of the slip-in contact, and an engaging portion that can be engaged with the movable side 11 of the slip-in contact provided on the lower terminal 5 of the bushing. 12b. The other configurations are the same as those in FIGS. 1 and 2, so their explanation will be omitted.

During connection work, the connection conductor 12 is connected to the slip-in contact movable side 11 as shown in FIG.
The engaging portion 12b of the bushing is pulled out to the outside of the electric field shield 8 and the insulation barrier 9, and in this state, the operator visually slips in the lower terminal 5 of the bushing through the connection manhole 13 provided in the tank 1. The contact movable side 11 and the engaging portion 12b are reliably connected. The connecting conductor 12 is then pushed into the normal assembly position shown in FIG. 3 to complete the connection.

5 and 6 show another embodiment of the invention. When using the connection structure described above, the bushing 4 is often fixed to the tank mounting flange 7 of the transformer or reactor by bolting, so the central axes of the mounting flange 7 and the fixed side 10 of the slip-in contact are aligned. It is necessary that the However, there may be slight eccentricity due to manufacturing errors or the like, or special effort may be required to align the center axes. In such a case, if the connection conductor side has a structure that allows eccentricity, connection can be made without difficulty. Figures 5 and 6
In the figure, the fixed side 1 of the slip-in contact
0 is held at the tip 15 of the connection lead 3 by a radially flexible lead 14. Therefore, even if there is some eccentricity, it is possible to connect with the flexible lead 14 without any difficulty.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a schematic configuration of a conventional device such as a transformer or a reactor. FIG. 2 is an enlarged sectional view showing the connection between the bushing and the connection lead in FIG. 3 and 4 are schematic cross-sectional views showing a bushing connection device according to an embodiment of the present invention, with FIG. 3 showing a state in which connection is completed and FIG. 4 showing a state in which connection work is in progress. FIG. 5 is a schematic cross-sectional view showing a bushing connection device according to another embodiment of the present invention, and FIG. 6 is a line A--
It is a horizontal sectional view seen from A. In the figure, 1 is a tank, 2 is a coil, 3 is a connection lead, 4 is a bushing, 5 is a bushing lower terminal, 6 is a bushing flange, 7 is a tank side mounting flange, 8 is an electric field shield (electric field relaxation member),
9 is an insulating barrier (electric field relaxation member), 10 is a fixed side of the slip-in contact, 11 is a movable side of the slip-in contact, 12 is a connecting conductor, 12a is a rod-shaped portion, 12b is an engaging portion, and 14 is a flexible lead.

Claims (1)

[Claims] 1. In a bushing connection device in which a connection part between a hollow connection lead pulled out from a coil inside the device and a bushing connection terminal is covered with an electric field relaxation member, the connection lead is provided in the connection lead in the connection part, and the connection lead is A connecting conductor is provided that is slidable between the inside and outside of the hollow and is drawn out to the outside of the electric field relaxation member when the connecting lead and the bushing are connected, and the connecting conductor The rod-shaped part is provided with a rod-shaped part that can slide between the inside and outside of the hollow part of the connection lead, and an engaging part that is provided at the tip of the rod-shaped part and can be engaged with the lower terminal of the bushing, and the rod-shaped part is made of a flexible member. A bushing device, characterized in that it is supported by the connection lead and is movable in the radial direction within a hollow portion of the connection lead.