JPH0417008B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a long busbar device that is used in a gas-insulated switchgear and is equipped with a flexible tank for absorbing thermal expansion displacement.

[Technical background of the invention and its problems]

The structure and operation of the conventional long busbar device are explained in the first section.
This will be explained according to the diagram. Center conductors 5, 6, 7 provided with slide contact portions 1, 2, 3, 4 that slide in the axial direction to absorb displacement are inserted into tanks 13, 14, 15 arranged on the same axis.

The center conductors 5, 6, 7 are connected to the tanks 13, 1
4, 15, with support spacers 10, 11, 12 slidably arranged, tanks 13, 14,
15. Between the center conductors 5 and 6 and 6,
Connecting conductors A, supported by fixed support spacers 8 and 9 fixed to tanks 13 and 14, are connected between 7 and 7.
Connected by B. Each center conductor 5, 6, 7 is connected to a branch conductor 16, 17, 18 and a branch tank 19, 2.
0 and 21 to other components 22, 23, and 24 of the gas insulated switchgear. Long busbar tanks 13, 14, 15 configured in this way
The thermal expansion displacement due to temperature change in tanks 13 and 1 is
It is absorbed by the expansion and contraction of flexible tanks 25 and 26 inserted between 4 and 14 and 15. still,
The flexible tanks 25 and 26 include tank 1.
3, 14, 15 Pressure compensation flexible tank 2 that compensates for the force due to the gas pressure sealed inside.
7, 28 and connecting rods 29, 30 are attached.

The long busbar device having the above configuration has the disadvantage that the outer diameter of the long busbar becomes large because it is attached to the outside of the pressure compensating flexible tanks 27 and 28.
It is necessary to attach the pressure compensating flexible tanks 27 and 28 to each of the flexible tanks 25 and 26, which complicates the structure and reduces the reliability of airtightness, which should be improved.

[Purpose of the invention]

The present invention has been made in order to eliminate the above-mentioned drawbacks, and an object of the present invention is to provide a long busbar device that can reduce the outer diameter of the long busbar and improve airtight reliability. It is.

[Summary of the invention]

According to the present invention, in order to achieve such an objective,
In a long busbar composed of at least three busbars, each of which has a central conductor inserted into the tank and a connecting portion with a gas insulated component device formed in a direction substantially perpendicular to the axis of the tank, each of the long busbars is The tanks are connected via a first flexible tank, and a second flexible tank is connected to one end of the long bus bar, and the first flexible tank is located at a position farthest from the second flexible tank. The flanges of the arranged first flexible tank and the second flexible tank are connected by a connecting member, so that the pressures acting on each flexible tank are offset.

[Embodiments of the invention]

The following will be explained with reference to an embodiment of the long busbar device of the invention shown in FIG. In FIG. 2, in which the same parts as in FIG. tank 1
3, 14, and 15 concentrically. The center conductors 5, 6, 7 are supported by support spacers 10, 1 which are slidably arranged relative to the tanks 13, 14, 15.
1 and 12 in tanks 13, 14, and 15. This support structure may be constructed by, for example, inserting and fixing a center conductor into the center of a support spacer, and providing a sliding device between the outer peripheral surface of the support spacer and the inner surface of the tank. Connection conductors A and B supported by fixed support spacers 8 and 9 fixed to the ends of tanks 14 and 15 are arranged between the central conductors 5 and 6 and between the opposing parts of 6 and 7, and these connection conductors The end portions of A and B are inserted into the slide contact portions 1, 2, 3, and 4 of the center conductors 5, 6, and 7 to connect the center conductors 5, 6, and 7, respectively. Branch conductors 16, 17, 18 and branch tank 1 are installed on the long busbar.
It is connected to other components 22, 23, 24 of the gas insulated switchgear via 9, 20, 21. Tank 13, 1 with a long bus bar configured in this way
Thermal expansion displacement due to temperature change in tanks 4 and 15 is absorbed by expansion and contraction of flexible tanks 25 and 26 inserted between each tank 13, 14 and 15. In addition, flexible tanks 25 and 26 are tank 1.
In order to compensate for the force of expansion and contraction due to the gas pressure sealed inside the flexible tanks 25 and 15, a flexible tank 32 having approximately the same cross section as the flexible tanks 25 and 26 is provided outside one end of the branch in the long bus bar. There is. In other words, the flexible tank 3 closes the end that communicates with the end of the tank 13.
2, flexible tanks 32 located at both ends,
The connecting rod 33 connects between the outer flanges 31 and 34 of 26.
Connect with. This allows flexible tank 3
It is designed to expand and contract due to pressures of 2, 25, and 26.

That is, this compensation effect will be explained with reference to FIG. The tanks 13, 14, 15 connected to the component devices 22, 23, 24, respectively, are mechanically integrated with the component devices. Now, when thermal expansion occurs due to temperature change of the long busbar, each flexible tank 25, 26, 32 receives forces F _1a , F _1b , F _2a , F _2b , F _3a , F _3b , occurs. By the way, the force F _1b exerted on the tank 14 by the force generated in the flexible tank 25 is canceled out by the force F _2a from the flexible tank 26. Similarly, the force exerted on the tank 13 by the flexible tank 25
F _1a cancels the force F _3b of the flexible tank 32. and the force F _2b from the flexible tank 26
The force F _3a of the flexible tank 32 and the force F 3a of the flexible tank 32 have opposite directions of action, and since both tanks 26 and 32 are connected by a connecting rod 33, this connecting rod 33
It will be offset through.

In this way, the force that causes the flexible tanks 25 and 26 to expand and contract due to the gas pressure in the tanks 13 and 14 is absorbed by the flexible tank 32 provided at one end of the tank 13 and the flexible tank 32,
This can be compensated by a connecting rod 33 connected between 26 and 26.

〔Effect of the invention〕

As explained above, according to the long busbar device of the present invention, the radial space of the long busbar fits within the size of the flange of the flexible tank, making it possible to downsize the long busbar. Furthermore, even if the number of flexible tanks placed between each tank for thermal expansion compensation increases, only one flexible tank is required to compensate for the force of gas pressure, and this can be done simply by changing the length of the connecting rod. Therefore, it is possible to provide a long busbar device that has a simplified configuration and can also prevent a decrease in reliability regarding airtightness.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram showing an example of a conventional device;
FIG. 2 is a schematic configuration diagram showing one embodiment of the present invention, and FIG. 3 is a diagram for explaining the operation of FIG. 2. 5, 6, 7... center conductor, 13, 14, 15...
... Tank, 22, 23, 24 ... Component equipment, 2
5, 26, 32...flexible tank, 33...
...Connecting rod.

Claims (1)

[Claims] 1. In a long busbar consisting of at least three busbars, each of which has a central conductor inserted into the tank and a connecting portion with a gas-insulated component device formed in a direction substantially perpendicular to the axis of the tank, the long busbar is Each tank is connected via a first flexible tank, and a second flexible tank is connected to one end of the long bus bar, and a position farthest from the second flexible tank among the first flexible tanks A long busbar device, characterized in that the flanges of the first flexible tank and the second flexible tank, which are disposed in the flexible tank, are connected by a connecting member.