JPS5827451Y2 - butsing - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a bushing used in sealed electrical equipment such as transformers, reactors, and capacitors.

This type of equipment is subject to transportation restrictions due to its size.
For some products, the bushing must be removed and transported.

However, in this case, when installing the bushing at the installation site, the insulating medium of the equipment comes into contact with the atmosphere or dissipates into the atmosphere during assembly, so it is necessary to perform vacuum degassing inside the equipment again at the installation site. There are some inconveniences that cannot be avoided.

In view of the above-mentioned issues, this invention uses a split-type bushing, and includes an internal conductor that electrically bridges the connection terminals provided at both ends of the bushing, at least a portion of which has a flexible portion. By constructing the device, the external bushing can be removed without breaking the seal of the container in which the device main body is housed during transportation, and the internal conductor can be stored within the internal bushing to reduce the size to below the transportation limit.

The following explanation will be given with reference to the drawings showing one embodiment of this invention.A bushing 1 is located in a container 3 of a sealed electric device 2, and is oil-tightly attached to the inner wall of this container 3 via a gasket 41. Bushing 1a and this internal bushing 1
The external bushing 1b is located outside the container 3 and is detachably attached to the outer wall of the container 3 via a gasket 42.

5 a and 5 b are lower and upper connecting terminals provided at the ends of the bushings la and lb; 6 is an internal conductor that electrically bridges between these connecting terminals 5 a and 5 b;
Terminal part 5a.

6b and a flexible portion 61 such as a braided wire, and the connecting terminal 5b on the external bushing 1b side and the terminal portion 6b are detachably connected.

7 is a shield electrode arranged around the outer periphery of the internal conductor 6 and connected to the internal conductor 6 by a lead wire (not shown) and is at the same potential; 8 is a low voltage side shield electrode that relieves the electric field at the flange 91, 92 portion. be.

43 and 44 are gaskets, 93 and 94 are flanges, 10 is a mounting base provided on the outer wall of the container 3, 11 is an insulating medium for insulating the main body of the sealed electrical equipment 2, and 12 is a material inside the bushing 1 as required. It is an insulating medium that is filled with the shield electrode 7, and may work together with a solid insulator provided on the outer periphery of the shield electrode 7 to achieve insulation.

Reference numeral 13 denotes nitrogen gas for adjusting the oil amount when insulating oil is used as the insulating medium 12, but instead of this, an OF type tank structure is provided in which an oil amount adjusting device is provided at the head of the bushing 1. Of course you can do that.

With the above configuration, when transporting this type of sealed electrical equipment 2, if the bushing 1 is filled with the insulating medium 12, after discharging the insulating medium 12,
The upper connecting terminal 5b is removed from the flange 94, and with the connecting terminal 5b lifted, a lock nut or the like is loosened to disconnect the connecting terminal 5b and the terminal portion 6b.

Thereafter, the external bushing 1b, the shield electrode 7, the low-voltage side shield electrode 8, etc. are removed, and the internal conductor 6 is housed in the internal bushing 1a.

Then, the upper opening of the internal bushing 1a is covered with a blind cover or a cover made of nylon using, for example, a screw hole or stud of the mounting base 10 to prevent rainwater from entering, and the internal bushing 1a is transported to the installation site.

In addition, to assemble bushing 1 at the installation site,
Just do the above steps in reverse.

Note that when filling the bushing 1 with the insulating medium 12, after the bushing 1 is assembled, only the inside of the bushing 1 may be vacuum degassed, and then the insulating medium 12 may be filled.

As detailed above, according to this invention, the external bushing of a sealed electrical device can be removed without breaking the seal, and the internal conductor can be stored inside the internal bushing, reducing its size and transporting it easily. With this structure, it is possible to save labor in on-site work.

In addition, even if some of the wires in the flexible part are damaged during transportation or related work, and the electric field is concentrated,
During use, the outer periphery of the inner conductor is covered with a shield electrode having the same potential as the inner conductor, so that dielectric breakdown caused by the above reason can be prevented.

[Brief explanation of the drawing]

The figure is a front sectional view showing an embodiment of this invention. 1...Bushing, 1a...Internal bushing, 1b...External bushing, 2...
... Sealed electrical equipment, 3... Container, 5 a,
5 b... Connection terminal, 6... Internal conductor, 61... Flexible portion, 6 a, 6 b...
...Terminal section, 7...Shield electrode.

Claims (1)

[Scope of utility model registration request] 1. An internal bushing located inside the container of the sealed electrical equipment and oil-tightly attached to the inner wall of the container; an external bushing corresponding to the inner bushing located outside the container and attached to the outer wall of the container; It consists of an internal conductor that electrically bridges the connecting terminals provided at the ends of the bushing and has a flexible portion at least in part, and connects this internal conductor and the connecting terminal on the external bushing side. A bushing characterized in that the bushing is detachably connected to the inner conductor and has a shield electrode arranged around the outer periphery of the inner conductor and having the same potential as the inner conductor. 2. The bushing according to claim 1, wherein the flexible portion of the internal conductor is a braided wire.