JPS6373822A - Gas insulated bus bar - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a gas j' colored busbar used in a power transmission line system, and particularly relates to a technology for absorbing expansion and contraction thereof. .

(Prior art) Gas insulated busbars constitute 190% of gas insulated, 1' length switchgear in power transmission line systems, or connect between gas insulated and closed equipment. It consists of a continuous connection of single busbars that are filled with insulating gas and housed with conductors.

Such a gas insulated busbar is fixed on a foundation or a pedestal by support legs, and the load of the conductor and tank that make up the busbar is 7J1. In addition to bending, the following forces are applied.

That is, the internal force of the 13 tl gas such as S ratio gas sealed in the tank along the axial direction of the generatrix, and the overspeed 1) of the tank caused by the temperature rise of the half-pipe conductor and changes in the outside temperature. The thermal expansion force is applied to the supporting leg.

These horns exert considerable weight as a whole, so supporting the generatrix against these forces, especially how to absorb thermal expansion and contraction, has become an important issue. Conventionally, there have been no methods for absorbing thermal expansion and contraction. The following methods have been adopted.

■ Bellows for absorbing heat expansion and contraction (Fig. 4) The method shown in Fig. 4 is to provide a bellows 12 in the bus bar 11, and support flanges 12a on both sides of the bellows 12 by fixing studs 13 and internal and external nuts (not shown). By loosening the fixing stud 13 by operating the nut,
Generatrix between supporting legs 14 at both ends ] 1 heat expansion and contraction is caused by bellows 1
2. It is absorbed by expansion and contraction.

Next, in a gas insulated bus bar as shown in Fig. 4, the amount of thermal expansion and contraction caused by temperature changes and the internal gas pressure are
The results of concrete measurements of the force applied to 4 are shown below.

Temperature change a, bellows set temperature...30'Cb, tank temperature...80'C to -20°CC3 Internal gas temperature...
・70℃～-20'Cd0 Annual outdoor temperature...40'
Temperature change is ±50' from measured values of C to -20'C or more.
Assume C. It is assumed that the temperature change of the concrete that makes up the foundation is ±10'C.

*Thermal expansion/contraction amount The amount of displacement of the bus bar 11 is determined from the above humidity change amount and unit bus length. Here, if the unit bus length is set to 6 m, the thermal expansion/contraction length 1 of the tank is as follows.

0-1=23.8 (linear expansion coefficient of aluminum) x'IQ-
8X (±50'C)X6000 (mm)=±7.14
(mm) Moreover, the thermal expansion and contraction of concrete 2 is as follows.

12=10 (linear expansion coefficient of concrete) x 1O-8X
(±10'C)X6000 (mm)=±0.6 (m
m> Therefore, thermal expansion/contraction Fm0- per unit generatrix length 6m is intersection=
Intersection 1 - Intersection 2 = ±6.54 (mm>, approximately ±7mm
It can be said that From this, the gap adjustment of the fixing stud 13 of the bellows 12 after installing the busbar is ±7.
It becomes mm.

*Influence of internal gas pressure When the gap of the fixing stud 13 of the bellows 12 is adjusted as described above, a load is applied to the support leg 14 due to the internal pressure horn. For example, when the bus bar 11 is supported by four support legs 14, the inner diameter of the tank is 120 cm, and the internal gas pressure is 3.8 kC]/Cm2 (70'C), the load ff1Pt per leg light is P+ =1202 (cm)
2xyr÷4X3.8 (kg/cm2)÷4 = 10744 (kg), and the support legs 14 that support this pressure must be made quite strong.

■Pressure balance bellows (Fig. 5) The method shown in Fig. 5 is to place a small bellows 15 around the bellows 12 for absorbing thermal expansion and contraction. The structure is as follows.

In addition, 16 in the figure is attached to the fixing stud 13,
flanges 12a of bellows 12 and small bellows 15;
It is a nut that supports 15a from inside and outside.

In addition, the inner diameter of the bellows 12 and the inner diameter of the small bellows 15
A condition is required that the numbers be the same. However, with this method, the overall size of the bellows becomes considerably large, making it difficult to remove it from the busbar when installed indoors, and the places where it can be used are limited.

(2) Spring balance bellows (Figures 6 and 7) The method shown in Figure 6 requires a configuration in which a spring-loaded bellows 18 with a spring 17 attached to one side of the fixing stud 13 is provided. The load and internal pressure of the generatrix 11 are supported by the support legs 14, and thermal expansion and contraction are absorbed by the spring-loaded bellows 18.

However, in this method, in addition to supporting the load of the main conductor and the tank, it is also necessary to support the thermal expansion and contraction of the tank due to temperature rises of the main conductor and changes in outside air temperature.
The four-layer frame 19 and the foundation must be made quite strong. Furthermore, the flange 18a of the spring-equipped bellows 18 becomes large due to the attachment of the spring 17. FIG. 7 shows an enlarged view of the spring-loaded bellows 18. In the figure, the diameter dimension D2 of the flange 18a of the bellows 1B is
Since it is quite large, it is difficult to install it when installed indoors, and the places where it can be used are limited. Further, when the spring 178 is used, there is also a problem that the structure becomes deformed.

(Problems to be Solved by the Invention) As described above, in conventional gas-insulated busbars, even if bellows are used to absorb thermal expansion and contraction, the supporting legs of the busbar end up having to bear the weight of the busbar itself, as well as the gas inside the busbar. Due to the addition of loads due to pressure and thermal expansion and contraction, the support legs and frame become larger, and the bellows itself also becomes larger, which poses problems such as limiting the locations where the gas insulated bus bar can be used.

The present invention was devised in order to solve these problems, and its purpose is to absorb thermal expansion and contraction with a simple structure, while also reducing the load applied to the support legs, pedestals, and foundations. It is an object of the present invention to provide a gas insulated bus bar that can be used in any location by simplifying these components and reducing the size of the head body.

[Development of the Invention] (Means for Solving the Problems) The gas one-color edge m-line of the present invention is a gas insulated bus bar having a plurality of branch busbars perpendicular to one live mother gland, and a gas insulated busbar having two orthogonal branch busbars. At the back, the branch part of the orthogonal branch bus bar is fixed at one location, and the other orthogonal branch is provided with a bellows at the branch part of the line, and the flange of the outer nut is attached to the fixing stud of the bellows. It is characterized by a spherical washer attached to the side.

(Function) With the above-described configuration, the present invention allows the orthogonal branch generatrix to be displaced in a direction orthogonal to its axis by the bellows and the spherical washer, so thermal expansion and contraction of the main generatrix can be absorbed. (The load applied to the one-line support 1t!Jl can be reduced. In particular, in movable branch parts, the load can be reduced by consuming it as movement energy, so the support legs, pedestal, and base IQ can be simplified.

(Example) Hereinafter, an example of a gas insulated bus bar according to the present invention will be specifically described using FIGS. 1 to 3.

Structure of Nido Embodiment The gas-insulated edge busbar shown in FIG. 1 includes a main m-line 1 and three orthogonal branch busbars 2 orthogonal to the main m-line 1. Of these,
The central branch part is supported on a fixed pedestal 3 via support legs 4, and the left and right branch parts are supported on a movable pedestal 5 via support legs. Then, a bellows 6 is disposed on the left and right orthogonal branch busbars 2.

FIG. 2 is an enlarged view showing the support structure of the flange 6a of the bellows 6 and the fixing stud 7. As shown in FIG. 2, on the inside of the nut 8a on the outside of the fixing stud 7 of the bellows 6, there is a groove V formed in a spherical shape on the flange 6a side.
9 is installed. Further, a gap G is provided between the inner side of the flange 6a and the inner nut 8b with a set dimension that can accommodate the displacement of the orthogonal branch generatrix 2.

:l': Effects of the Embodiment The effects of this embodiment, which has the above-mentioned configuration, are as follows.

That is, when the main m-line 1 expands or contracts, the movable frame 5 moves in the direction of the IN1 line of the main m-line 1, and the bellows 6 deforms, thereby absorbing the thermal expansion and contraction.

In this case, as shown in FIG.
Also, if J3 is inside the flange 6a, the flange 6a
Therefore, according to this embodiment, the movement of the movable frame and the tilting of the bellows 6 by the eagle 1) 9 are absorbed by the gear 1-8b. Due to deformation, it absorbs the thermal expansion and contraction of one pair of wires. Therefore, the load applied to the support legs 4 and the frames 3 and 5 can be reduced, and their configurations can be simplified. Furthermore, since the bellows 6 has a simple configuration with a eagle t9 provided inside the neck 1-8a, for example, the diameter dimension D1 of the flange 6a of the bellows 6 is as shown in FIG. t) Compared to the diameter dimension F]2 of the flange 18a in J3 technology, it has been significantly reduced to about three-fourths.

Second, other embodiments The present invention is not limited to the above embodiments. For example, the orthogonal branch lines may have two or four branch points.
It is similarly applicable to the case where there are more than four branching parts. For example, when there are four or more branching parts, a configuration in which a fixed pedestal and a movable pedestal are alternately provided can be considered.

[Effects of the Invention] As explained above, according to the present invention, thermal expansion and contraction of the generatrix can be prevented by using a fixed and movable frame and by providing a spherical washer on the nut supporting the bellows. In addition, the load applied to the support legs and pedestal can be significantly reduced, making it possible to simplify and downsize the structure of the rest area, and to provide a gas-insulated bus bar that can be used even when placed indoors.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the gas insulated bus bar according to the present invention, FIG. 2 is an enlarged side view of section A in FIG.
FIGS. 4 to 6 are side views showing different examples of conventional gas-insulated busbars, and FIG. 7 is a bellows portion in the conventional example shown in FIG. 6. FIG. 1... Main busbar, 2... Orthogonal branch busbar, 3... Fixed pedestal, 4... Support leg, 5... Movable pedestal, 6...
- Bellows, 6a...flange, 7...fixing stud, 8a, 8b...nut, 9...eagle. 11... bus bar, 12... bellows, 12a, 15a
. 17a...Flange, 13...Fixing stud, 1
4...Support leg, 15...Small bellows, 16...
Nut, 17... Spring, 18... Bellows with spring, 19... Frame.

Claims (2)

[Claims] (1) A gas gas consisting of a single bus bar in which an insulating gas is sealed in a tank and a conductor is housed in a continuous connection, and a main bus bar has multiple branch bus bars perpendicular to the axis of the main bus bar. In the insulated bus bar, a branch part of the orthogonal branch bus bar at any one location among the orthogonal branch bus bars is fixed, a bellows is provided at a branch part of another orthogonal branch bus bar, and the flange of the bellows is fixed. A gas insulated bus bar supported by studs and inner and outer nuts, and characterized in that a washer whose flange side is formed into a spherical shape is attached to the flange side of the outer nut. (2) The gas insulated bus bar according to claim 1, wherein the inner nut is attached with a gap between it and the flange.