JPS5942527B2 - Long connecting busbar between devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a long connecting bus bar between devices used for connecting electrical devices such as capacitors and transformers.

As shown in FIG. 1, a typical example of a conventionally used connecting bus bar between devices is one in which an insulating paper 2 is wrapped around a main conductor 1 that connects devices, and a bus bar is connected approximately in the center of a metal conduit 3. Mainly used were pipes 3 supported by insulating spacers 4 and insulating oil 5 filled in the pipe line 3.

However, as the operating voltage increases, the insulation distance becomes larger, which inevitably increases the inner diameter of the pipe, increasing the required capacity of insulating oil, and especially the distance between connected devices. If it is long, the connecting bus bar becomes larger and has the disadvantage of being expensive.

The long connecting bus bar between devices of the present invention was made to solve these conventional drawbacks, and in the connecting bus bar between devices in which at least an axial center electrode is inserted into the conduit,
An intermediate electrode is concentrically buried in an insulator on the outer periphery of the axial center electrode, and a connecting body having substantially conical ends and a cylindrical middle part, and a connecting body located between a plurality of connecting bodies, and an axis of these connecting bodies. a cylindrical mating electrode that electrically connects the heart electrodes to the same potential;
The inner surface has a taper opposite to the taper of the conical end of the connecting body, and both ends thereof are fixed to the outside of the connecting body 10 so as to surround the conical part of the connecting body 10 inside the taper. and a back electrode that coaxially connects with the connecting body, the innermost layer intermediate electrode and the outermost layer intermediate electrode in the insulator of the connecting body are inserted over almost the entire length of the insulator, and the innermost layer and the back electrode are provided. The plurality of intermediate electrodes between the outermost layer are formed to be shorter than the intermediate electrodes of the innermost layer and the outermost layer, one end of which is not exposed from the conical end surface of the insulator, and is separated from the axial center electrode. Therefore, a long connection bus bar between devices is arranged in a stepwise manner with a certain step in the axial direction, and electrically connects the intermediate electrode in the innermost layer and the axial center electrode, and the intermediate electrode in the outermost layer and the back electrode, respectively. It is.

To explain one specific example in more detail using FIG. 2, 1
0 is a connecting main body, which includes a cylindrical axial center electrode 6, a plurality of intermediate electrodes 8°81.8〃 made of aluminum foil coaxially provided on the outer periphery of this axial center electrode 6, and these intermediate electrodes. 8, 8', and 8'' are buried therein, and a cylindrical insulator 9 has substantially conical ends at both ends.

The intermediate electrodes 8, 8', 8'' are formed by laminating an insulating paper 7 around the axial center electrode 6, and the axial center electrode 6 of the intermediate electrodes 8.8', 8'' The intermediate electrode 8' closest to the central electrode 6 and the intermediate electrode furthest from the central electrode 6 are inserted over almost the entire length of the insulator 9, and the remaining intermediate electrodes 8, that is, the intermediate electrodes closest to the central electrode 6, The plurality of intermediate electrodes 8 between the intermediate electrode 8' and the farthest intermediate electrode 8 are located only at both ends of the insulator 90, and as they move further outward in the circumferential direction from the axial center electrode 6, one end thereof becomes closer to the insulator 90. They are arranged in a step-like manner with a constant step in the axial direction along the conical end surface of No. 9.

Then, the axial center electrode 6 and the innermost intermediate electrode 8' are connected to the same potential, and the axial center electrode 6 of the connection main body 10 is connected to the same potential.
A connecting fitting 11 electrically connected to the outermost intermediate electrode r is fixed to the outer circumferential surface parallel to the outermost layer using an adhesive, for example.

In this case, it is preferable that a recess into which the connecting fitting 11 fits is formed in the outer peripheral surface of the connecting body 10, and that the connecting fitting 11 is fixed in the recess.

A spring 12 made of a spiral ring is provided between the axial center electrodes 60 of the plurality of connection main bodies 10, and the spring force of this spring 12 electrically connects the axial center electrodes 6, keeping them at the same potential at all times and having a T-shaped cross section. The cylindrical fitting electrode 13
is fitted between the axial center electrodes 6, and furthermore, a back electrode 14, which has a taper opposite to the taper at both ends of the insulator 9 of the connection body 10 and is made of a conductive material, is placed outside the connection body 10 to complete the connection. It is a long connection bus bar in which a metal fitting 11 and a back electrode 14 are tightened with studs 15 and nuts 16 to electrically connect them, and a plurality of connection bodies 10 are connected together.

In this case, the back electrode is electrically connected to the conduit 17 directly or via the connecting fitting 11.

In the long connecting busbar configured in this way, the connecting body 10
Since it is integrally formed with the cylindrical axial center electrode 6 as the axial center, it is not only mechanically strong, but also in the event that the axial center electrode 6 is damaged due to temperature changes during use. Insulator 9
Even if peeling occurs between the two, the innermost intermediate electrode 8', which is embedded in the insulator 9, is provided over almost the entire length of the connecting body 10 and has the same potential as the axial center electrode 6. Since the bond is connected like this, such peeling does not become an electrically weak point, and electrically and mechanically stable characteristics can be obtained over a long period of time.

Further, the reason why the intermediate electrodes 8, which are shorter than the intermediate electrodes 8' and 8 in the innermost and outermost layers, is inserted only into both ends of the insulator 90 is that, for example, all the intermediate electrodes 8 are inserted into the intermediate electrodes in the innermost and outermost layers. 8' and 8'', if the insulator 9 is inserted over almost the entire length, the mutual capacitance between the intermediate electrodes will become uneven, and the voltage sharing between each electrode will become uneven, causing the inside of the insulator 9 to become unequal. This is to prevent this from occurring as it may cause dielectric breakdown.

This becomes more noticeable as the length of the connecting body 10 becomes longer.

Particularly in connection busbars between devices as in the present invention, a considerably long connection body 10 is essential, so short intermediate electrodes 8 are inserted only at both ends of the insulator 9 where electric fields tend to concentrate. This configuration is preferable because the above-mentioned problem can be solved very effectively.

Note that, as in the above embodiment, the back electrode 14 has a taper that is completely opposite to the taper of the substantially conical portion of the opposing insulator.
By providing a conical portion of the connecting body 100 on the inside of the taper to surround the conical portion of the connecting body 100, the potential distribution on the tapered outer surface of the insulator 9 can be improved.

That is, by tapering the end face of the insulator 9, the creepage discharge distance of the taper can be at least doubled, and as a result, the potential gradient on one surface of the taper is relaxed, so that the creepage distance of a part of the taper is reduced. Not only can the electrical strength of the insulating medium 19 be significantly strengthened, but the electrical gradient within the insulating medium 19 existing in the area surrounded by the back electrode 14 and both connecting bodies 10 10 can be alleviated by eliminating local concentration. This is preferable because it eliminates physical weaknesses and improves stability.

When in use, this long connecting bus bar is inserted into the conduit 17 with a spacer 18 in between if necessary, the connecting fitting 11 is grounded, and the empty space in the conduit 17 is filled with insulating oil or SF6 gas. The connection can be easily made by simply inserting the insulating medium 19 and inserting the main conductor 1, which connects the devices, into the axial center electrode 6 as a bare wire.

Note that the above-mentioned spacer may be made of plastic, metal, or a conductor, and does not necessarily have to be an insulator, and the spacer may not be included.

This is because the portion supported by the spacer 18 is sufficiently insulated by the insulating main body 10.

In addition, in the above-mentioned embodiment, the case where the main conductor 1 for connecting devices is inserted into the cylindrical axial center electrode 6 was described in detail, but the present invention can be modified in various ways without departing from the spirit and scope thereof. For example, a round bar-shaped axial center electrode 6 is used, and this round bar-shaped axial center electrode also serves as the main conductor 1 for connecting devices, and when connecting between these round bar-shaped axial center electrodes, for example, a fitting electrode 13 Of course, the connection may be made using a chini lip contact or the like instead.

As described above, in the long connecting bus bar between devices of the present invention, intermediate electrodes for electric field adjustment are inserted into the insulating body in the innermost layer and outermost layer approximately the length of the insulating body, and other intermediate electrodes are inserted at both ends. The tip of the electrode is inserted in a stepped manner with a certain step in the axial direction, and the outermost intermediate electrode is connected to ground through the connecting metal fitting, and between the connecting bodies, the two are coaxially connected from the outside and fitted together. Since the back electrode surrounding the conical part of the electrode and the connecting body is connected to the inside thereof, and the axial center electrode is connected to the same potential by a mating electrode, the electric field at both ends of each connecting body is There is no disturbance or corona generation, and the electrical stability of the insulating medium can be achieved.

Furthermore, it is possible to obtain a connecting bus of any length by adjusting the number of connected main parts depending on the length and shortness between devices, and although connection and assembly are easy, it is small and can be used stably up to high voltages. It is extremely useful industrially.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of a conventional connecting bus between devices.
The figure is an explanatory diagram of a long connecting bus between devices according to the present invention. 1... Main conductor, 2, 7... Insulating paper, 3
, 17... Pipe line, 4, 18... Spacer, 5... Insulating oil, 6... Axial electrode, 8, 8', 8 ...... Intermediate electrode, 9...
...Insulator, 10...Series unit, 11...
...Connection fitting, 12...Spring, 13.
...Mating electrode, 14...Back electrode, 1
5...Stud, 16...Nut, 1
9...Insulating medium.

Claims (1)

[Claims] 1 In a connecting bus bar between devices in which at least the axial center electrode 6 is inserted into the conduit 17, intermediate electrodes 8, 8', 8'' are buried concentrically in the insulator 9 on the outer periphery of the axial center electrode 6 at both ends. is located between a connecting body 10 having a substantially conical shape and a cylindrical intermediate portion, and a plurality of connecting bodies 10, 10, and electrically connects the axial center electrodes 6, 6 of these connecting bodies 10 to the same potential. The fitting electrode 13 has a cylindrical shape, and has a taper on its inner surface that is opposite to the taper of the conical end of the connecting body 100, and both ends thereof are arranged so as to surround the conical part of the connecting body 100 inside the taper. A conductive back electrode 14 is fixed to the outside of the connecting body 10 to surround the fitting electrode 13 and coaxially connect with the connecting body 10. The intermediate electrode 81 and the outermost layer intermediate electrode 8'' are inserted into the insulator over almost the entire length of the insulator 9, and the plurality of intermediate electrodes 8 between the innermost layer and the outermost layer are inserted into at least the innermost layer and the outermost layer. The intermediate electrodes 8', 8'' are formed shorter than each other, one end of which is not exposed from the conical end surface of the insulator 90, and the intermediate electrodes 8' and 8'' are arranged in a stepped manner with a constant step in the axial direction as the distance from the central electrode 6 increases. A long connection bus between devices, characterized in that the innermost intermediate electrode 81 and the axial center electrode 6 are electrically connected, and the outermost intermediate electrode 8'' and the back electrode 14 are electrically connected.