JPS6349444B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission tower provided with a gas insulated bus bar, and particularly to a combination of a gas insulated bus bar and a power transmission tower.

Recently, gas-insulated busbars, in which power transmission lines are insulated with an insulating gas such as sulfur hexafluoride (SF ₆ ) gas and sealed in a metal pipe container, have been used. An example of its structure is shown in Figure 1 of the accompanying drawings, in which reference numeral 1 is a container made of metal pipe such as aluminum, 2 is a conductor, and 3 is a support for the conductor 2 at the center of the container 1. The conductor 2 and the container 1 are insulating spacers made of epoxy resin, etc.
The container 1 is insulated by an insulating gas 4 such as sulfur hexafluoride (SF ₆ ) gas. Also,
A contact convex 5 and a contact concave 6 are formed at the ends of the conductor 2, respectively, and a gas insulated bus bar 7 is constituted by the container 1, the conductor 2, the insulating spacer 3, and the insulating gas 4. There is.

Such a gas insulated busbar is configured to have a length that can be transported, and at the time of installation, the conductor 2 connects the contact protrusion 5 and the contact protrusion 6 that are adjacent to each other, and the container 1 is By connecting unused flanges or by welding, etc., they can be extended one after another.

Further, if necessary, a connection such as a bushing can be made, and it is also possible to connect to an aerial power transmission line via this bushing.

Such gas-insulated busbars have many advantages when connected to overhead lines at transmission towers.
An example of connection with this overhead line is shown in FIGS. 2A and 2B.

In the figure, the gas insulated bus 7 is of a three-phase one-piece type, stands up vertically from the center of the power transmission tower 10, is bent horizontally at a lower arm 11, and is provided with bushings 12 for the three phases.

In addition, the power transmission tower 10 has a main member 10 ₋₁ and a diagonal member 10
The power transmission tower ₁₀ has a lower arm ₁₁ at the middle, an upper arm 13 at the top, and an upper arm 13 and a lower arm. Between gold 11 and arm gold 14, for example, 14
_-1 , 14 _-2 and 14 _-3 are provided respectively, and an overhead ground wire 15 is attached to the upper arm 13, and a power transmission line is attached to the arm 14 _-1 , 14 _-2 and 14 _-3 . 16 is attached by a retaining insulator 17. Also, arms _14-1 , _14-2 and _14-3 ,
Upper retaining insulators 1 are placed between the upper and lower cross arms 11.
8 and a lower stay insulator 19, respectively, and a draw line 20 is attached to the pull line 20,
The power transmission line 16 and the bushing 12 are electrically connected by a jumper wire 21 or the like as shown in FIGS. 2A and 2B.

In this way, the gas insulated bus bar 7 and the power transmission line 16 are compactly connected on the power transmission tower 10.

The gas insulated bus bar 7 is fixed to the lower cross arm 11 by a frame 22 to prevent it from moving due to earthquakes, wind pressure, etc.
The vertical part of the power transmission tower 1 is supported by the support 23.
It is fixed to the main material 10 _-1 of 0.

Because conventional power transmission towers are configured in this way, in power transmission towers with gas-insulated busbars, the power transmission lines 16 must be separated from each other, and the upper cross arm 14 _-1 where the wind pressure is the greatest is required. is the second
As shown in the figure, each member of the power transmission tower 10, namely the main member 10 _-1 , the diagonal member 10 _-2 and the horizontal member 10 _{-3 is} As a result, the cost of constructing transmission towers has increased, and in addition, since a large tower is located at the top of the tower, it will shake more strongly, which is not desirable in terms of earthquake resistance. It has drawbacks.

In addition, as can be understood from the diagram, the bushings for the three phases are arranged side by side with a separation distance of the withstand voltage, so the width is wide, and therefore the installation is subject to space constraints. There is also a drawback that it becomes like this.

Furthermore, the power transmission tower having such a configuration also has the disadvantage that it is not very aesthetically pleasing.

It is an object of the present invention to eliminate such various conventional drawbacks and to provide a power transmission tower with a gas-insulated busbar that is compact, has good earthquake resistance and wind pressure resistance, and is aesthetically superior. It is.

In order to achieve this object, the present invention is provided with a lower cross-arm protruding from the main material in a T-shape, and the lower cross-arm is provided with a horizontal portion of each phase of the gas insulated bus bar and a horizontal portion of each phase for connecting the power transmission line. Bushings are installed radially, and on the top of the transmission tower, arms for holding the power transmission line are installed radially in correspondence with the horizontal part of each phase of the gas-insulated bus bar and each bushing against the main material of the transmission tower. The present invention is characterized in that a draw-down line that extends almost perpendicularly from the cross arm through the upper retaining insulator is fastened to the lower retaining insulator provided near the bushing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing one embodiment thereof.

In FIG. 3 showing the first embodiment of the present invention, reference numeral 30 is the main member of the power transmission tower, and 31 is a lower arm that extends from the main member 30 in a T-shape below the middle thereof. and 32 is bushing. Reference numeral 33 denotes a gas insulated bus bar, the vertical part of which is installed in the cavity in the main member 30, and at the position of the lower arm 31, is bent in the direction of the lower arm 31 and pulled out horizontally. and is pulled out by a bushing 32 attached thereto.

Further, between the top of the power transmission tower and the lower arm 31, there are arms 34, for example, arms 34 _-1 , 34 _-2 , 3
4 _-3 is the gas insulated busbar installed on the lower cross arm 31,
And, so as to correspond to each bushing 32,
Each is attached radially, with an overhead ground wire 35 at the top, and each cross arm 34 _-1 , 34 _-2 ,
34 _-3 , a power transmission line 36 is attached to each end via a retaining insulator 37. Moreover, between the tips of the arms 34 _-1 , 34 _-2 , 34 _-3 and the tips of the lower arms 31 in the direction of the bushing 32 of the horizontal gas insulated bus 33, there are upper and lower retaining insulators 38 .
A drop wire 40 is attached to the power transmission line 36 and the bushing 32 through the lower suspension insulator 39, respectively, and the drop wire 40 is electrically connected to the power transmission line 36 and the bushing 32 by a jumper wire 41 or the like as shown in the figure. has been done.

Further, the gas insulated bus bar 33 has a base point P of its horizontal portion, that is, a bending point P where it bends from the vertical portion to the horizontal portion,
In other words, it is fixed to the lower cross arm 31 at the branching point P where it branches radially, and the thermal expansion and contraction of the horizontal part is made to move along with the bushing 32 so that it can escape to the lower retaining insulator 39 side.

Since the power transmission tower of the present invention is constructed as described above and each bushing is arranged radially around the main member of the power transmission tower, the width is increased unlike in the conventional device. The disadvantage of occupying a large amount of installation space can be avoided, and since multiple bushings are not lined up side by side, the length of the arms can be short, and the structure is simple in terms of wind and earthquake resistance. In addition, it has many advantages such as being able to reduce the size and weight of the parts in terms of strength, and is also extremely aesthetically pleasing. Another advantage is that it can be applied to tall transmission towers.

Furthermore, the gas insulated bus bar is connected to the horizontal branch point P.
Because it is fixed to the lower cross arm, even if the horizontal parts, which are separated for each phase, change in the amount of expansion and contraction due to the influence of solar radiation, etc., the ends of the horizontal parts can freely expand and contract. This also has the effect of not causing any stress strain on the constituent members.

Next, a second embodiment, which has a structure partially different from the first embodiment, will be described with reference to FIG. 4 of the accompanying drawings, but a description of parts having the same structure as the first embodiment will be omitted.

In the figure, each horizontal part _33-1 branching into each phase of the gas insulated bus 33 is configured with its tip further extended than that of the first embodiment, and this extended part is shown in FIG. Consisting only of container 1,
The inside thereof has a structure that is not provided in the conductor 2, and only this structure is different from the first embodiment. Because of this structure, in the second embodiment, this extended portion contributes to heat radiation of the gas insulated bus bar, and furthermore, by providing this gas insulated bus bar in contact with the lower arm arm 31, the lower arm arm Gold 3
1 and the relative thermal expansion and contraction can be minimized, so even if the leading edge of the gas insulated bus bar is fixed together with the branch point P of the horizontal part, thermal expansion and contraction will not occur. The above problem will not occur.

As described above, according to the power transmission tower of the present invention, it is possible to connect the gas insulated bus bar and the power transmission line while suppressing the spread of the power transmission tower, so it is possible to install it in a narrow place, and it is aesthetically pleasing. is also preferable,
In addition, because the arms are smaller and lighter, they are extremely advantageous in terms of earthquake resistance and wind resistance, as well as reduce construction costs.In particular, they have the effect of being able to be applied to ultra-high voltage power transmission towers. are doing. Further, by fixing the branch point of the horizontal portion of the gas insulated bus bar, there is an effect that the difference in thermal expansion and contraction of each phase does not become a problem.

Furthermore, as in the second embodiment, heat dissipation of the gas insulated bus can be improved by extending the tip of the horizontal portion of the gas insulated bus, and this tip can be extended along with the branch point of the horizontal portion. By fixing it, it also has the effect of improving seismic performance when the bushing becomes large in heavily polluted areas.

In addition, in the first and second embodiments described above, it is also possible to use either the upper detention insulator 38 or the lower detention insulator 39 as a lightning arrester, and the effect in this case is also the same as in the first and second embodiments. It's no different from the example.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional explanatory diagram of a gas-insulated bus bar;
The figure is a schematic overall view of a conventional power transmission tower with a gas-insulated busbar, in which A is its front view, B is its side view,
Figure 3 shows the first transmission tower with gas insulated busbar of the present invention.
FIG. 4 is a schematic overall view of the embodiment, where A is a plan view (however, descriptions of the gas insulated bus bar and the stop insulator are omitted), B is a front view, C is a side view, and FIG. 4 is a schematic diagram of the second embodiment. In the overall diagram, A is a plan view, B is a front view, and C is a side view. 1... Container; 2... Conductor; 30... Main material; 31
...Lower armrest; 32...Butting; 33...Gas insulated busbar; 33 _-1 ...Horizontal part; 34 _-1 , 34
_-2 , 34 _-3 ... Arm; 36 ... Power line; 37 ...
Retaining insulator; 38... Upper retaining insulator; 39... Lower retaining insulator; 40... Drawdown line; 41... Jumper line; P... Branch point.

Claims (1)

[Claims] 1. A gas insulated bus bar rises in the main material of a transmission tower,
In a power transmission tower with a gas-insulated busbar that is horizontally bent and drawn out along a lower arm installed below approximately the middle of the transmission tower, the lower arm is installed so as to overhang in a T-shape with respect to the main member. At the same time, each phase horizontal part of the gas insulated bus bar and each bushing for connecting the power transmission line are attached radially to the lower cross arm,
At the top of the power transmission tower, arms for holding the power transmission line are installed radially from the main material of the transmission tower, corresponding to each phase horizontal part of the gas insulated bus bar and each bushing, and from each arm through the upper holding insulator. 1. A power transmission tower with a gas-insulated busbar, characterized in that a down-conductor line lowered almost vertically is fastened to a lower detention insulator provided in the vicinity of the bushing. 2. The horizontal part of each phase of the gas insulated bus bar and each bushing are attached to the lower arm at the branch point of the horizontal part, and the thermal expansion and contraction of the horizontal part expands and contracts in the direction of the bushing, and the bushing 2. A power transmission tower with a gas-insulated busbar according to claim 1, wherein the power transmission tower is adapted to move with expansion and contraction of the horizontal portion. 3. Each phase horizontal part of the gas insulated bus bar provided on the lower cross arm is configured to further extend from each bushing toward the lower retaining insulator, and this extended part, or
A power transmission tower with a gas insulated bus bar according to claim 1, wherein the power transmission tower is fixed to a lower cross arm at a branch point of the extension portion and the horizontal portion of each phase. 4. A power transmission tower with a gas-insulated busbar according to any one of claims 1 to 3, wherein either the upper detention insulator or the lower detention insulator is a lightning arrester.