JPS6349446B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power transmission tower with a gas insulated bus bar provided with a gas insulated bus bar, particularly a power transmission tower having a gas insulated bus bar and a power transmission tower formed such that the upper part branches and opens, particularly an X-shaped power transmission tower. This relates to the combination with transmission towers.

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 insulated by an insulating gas 4 such as sulfur hexafluoride (SF ₆ ) gas filled in the container 1. There is. Further, a contact protrusion 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. ing.

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 a gas-insulated busbar has many advantages when connected to an overhead line at a power transmission tower, and FIGS. 2A and 2B show an example of connection with an overhead line.

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 , 14 _-3 are provided respectively,
An overhead ground wire 15 is attached to the upper arm 13, and a power transmission line 16 is attached to the arm 14 _-1 , 14 _-2 , 14 _-3 by a retaining insulator 17 . Further, upper retaining insulators 18 are provided between the arms 14 _-1 , 14 _-2 and 14 _-3 and the lower arms 11 on the upper and lower sides.
A drop-down wire 20 is attached through the lower suspension insulator 19, and a jumper wire 21 is connected between the drop-down wire 20, the power transmission line 16, and the bushing 12 as shown in FIGS. 2A and B. electrically connected to.

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. It is fixed to the main member 10 _-1 of the power transmission tower 10 by.

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 construction cost of the power transmission tower has risen somewhat, and furthermore, since a large tower is located at the top of the tower, it will shake more strongly, which is not desirable from an earthquake-resistant perspective. It has the following 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, in power transmission towers with this type of structure, bushings are installed at relatively low locations, which creates an intimidating feeling to the ground, especially when roads such as viaducts are installed nearby. The feeling of intimidation becomes even greater, which is not good for the environment.
On the other hand, if bushings were to be installed at higher positions, the reinforcement of the transmission tower would have to be extremely strong, and the result would be extremely uneconomical. It has a drawback that makes it impossible to do so.

Furthermore, such a structure also has the disadvantage that it is not very aesthetically pleasing.

The various drawbacks of the conventional devices as described above are as shown in FIG. Although it is possible to eliminate this problem by using a power transmission tower with an insulated bus bar, such a power transmission tower with a gas insulated bus bar still has the following drawbacks.

In other words, an overhead power transmission line is naturally strung and connected between one power transmission tower and an adjacent power transmission tower at a predetermined distance, but in this case, between the adjacent power transmission towers, Normally, in order to escape thermal expansion and contraction of the power transmission line, the power transmission line is stretched horizontally and has some slack in the middle.Furthermore, the power line itself sag due to its own weight. , the power transmission lines strung between adjacent power transmission towers all have an arched shape downwards.

Each power transmission line under tension will sway due to wind, etc., but in windy regions or when the wind is strong, the sway becomes especially large, and the power transmission lines usually If a particularly large vibration occurs because the circuit is comprised of a plurality of lines, there is a risk of a short circuit occurring if the intervals between the lines are shortened due to the large vibration.

To prevent this risk, in windy regions, insulator spacers are inserted between lines to maintain line spacing, or the distance between adjacent power transmission towers is increased from the normal distance. Various countermeasures have been taken, such as reducing the fluctuation width of the lines by making the lines shorter, thereby suppressing the reduction in the spacing between lines due to vibration to within a predetermined limit.

However, the current situation is that all of these measures require a considerable amount of equipment cost, and therefore are uneconomical and undesirable.

The present invention eliminates the drawbacks of the conventional equipment, has good earthquake resistance and wind resistance, does not require reinforcement of each member constituting the power transmission tower, does not require a large installation space when installing the power transmission tower, and does not have an intimidating appearance. It is an object of the present invention to provide a power transmission tower with a gas-insulated busbar that is free from damage, is aesthetically pleasing, and is less likely to cause short-circuit accidents between lines due to swaying of the line due to wind.

In order to achieve this object, the present invention provides a power transmission tower having an X shape, a gas insulated bus bar being disposed on a main member forming the X shape, and fixed to the main member at the upper and lower ends thereof, and at an intermediate portion thereof. The arms and bushings, which are movable supports and which attach the power transmission line via the retaining insulator, are above the X-shaped intersection of the transmission tower and are approximately perpendicular to the hanging direction of the overhead power transmission line. The bushings and the gas-insulated busbars are electrically connected to each other at a position corresponding to the mounting position of the bushing to the main material. It is characterized by:

Hereinafter, the present invention will be explained based on the accompanying drawings showing one embodiment thereof.

In FIG. 4 showing the first embodiment, a main member 41 constituting a power transmission tower 40 with a gas-insulated busbar is formed in an X shape, and may be formed into a member having an appropriate shape such as a hollow shape or a groove shape as necessary. It is composed of. Further, the symbol 42, for example, 42 _-1 , 42 _-2 ,
_42-3 is an arm for holding power transmission lines, and the main material 4
1 above the X-shaped intersection groove 43 and protrudes in a direction substantially perpendicular to the side surface, that is, in substantially the same vertical plane perpendicular to the tension direction of the overhead power transmission line. Installation provided. Code 44, e.g. 44 _-1 , 44 _-2 , 44 _-3
is a bushing when the gas insulated bus bar is a three-phase one-piece type, and is located near the cross arms _42-1 , _42-2 , _42-3 , and in the same direction within the vertical plane of the main material. It is provided so as to protrude from the side of 41. Further, reference numerals 45 and 45' denote gas insulated busbars that are drawn in from the lower part of the main member 41 and are provided rising inside the main member 41 or along the sides thereof, and each gas insulated The bus bar 45 or 45' is
Each of them stands up on the side drawn in at the bottom, and without intersecting each other at the intersection 43 of the main material 41, is bent into a dogleg shape and rises along the upper member on that side of the main material 41. , are electrically connected to the bushings at positions corresponding to the attachment portions of the bushings 44 _-1 , 44 _-2 , 44 _-3 to the main member 41 .

Note that reference numeral 46 denotes an overhead power transmission line, which is attached to armrests 42 _-1 , 42 _-2 , 42 _-3 through retaining insulators 47 , and bushings 44 _-1 , 44 .
_-2 and 44 _-3 are electrically connected by jumper wires 48, respectively.

Further, the gas insulated busbars 45, 45' are connected to the steel tower 40 with gas insulated busbars at their upper and lower ends, for example, the main member 4 of the gas insulated busbars 45, 45'
1, and the intermediate portion is supported so as to be movable in the dogleg bending direction due to thermal expansion and contraction.

Note that the gas insulated bus bars 45, 45' are made of the main material 41.
It may be provided inside the main material 41, or it may be provided outside along the main material 41.

Since the power transmission tower with a gas-insulated busbar of the present invention is constructed as described above, the arms 42 _-1 for holding the power transmission line,
_42-2 and _42-3 are opened in an X-shape, the distance between the left and right circuits of the power transmission line 46 attached to them is also widened, and therefore each circuit is easily separated by wind between adjacent transmission line towers. Even if it shakes, the wide spacing between the left and right lines prevents the lines from approaching below a predetermined spacing, thus eliminating the risk of accidents such as short circuits.

Furthermore, if the gas insulated bus bars 45, 45' are extended to the upper part of the main material 41 as shown by the dashed line, the temperature rise due to current flow or outside air temperature inside the gas insulated bus bars 45, 45' can be avoided. The temperature rising insulating gas that has risen to the top due to the rising airflow generated by the cooling process is further cooled by the outside air in this extended part, which is achieved by the almost vertical arrangement. As a result, this cooled insulating gas descends again and repeats this cycle, which also has the effect of activating cooling.

Furthermore, if the gas-insulated busbars 45, 45' are extended to the top of the transmission tower with gas-insulated busbars, protection against lightning strikes becomes a problem. If the restraining insulator 47 is used as a lightning arrester, in particular, a plurality of lightning arresters installed in parallel, it will not require much space and will also prevent the transmission line from falling due to damage to the lightning arrester, which is extremely convenient. .

As described above, in the first embodiment, the gas insulated bus 4
5, 45' along the inside or side of the main material 41, and bend it in a dogleg shape at the intersection 43 of the main material 41, so that it can be attached to the upper member of the main material along the upper member without crossing. However, as in the second embodiment shown in FIG.
2, the gas insulated bus bars 53, 53' are made to stand up straight without bending, and stand up along the opposite side of the main member 51, for example, along one leg _51-1 of the main member 51. 53 stands up along the other upper member _51-2 of the main member 51,
Similarly, the gas insulated bus bar 53' on the opposite side is
After rising along the other leg portion _51-3 , it rises along the upper member _51-4 on the opposite side.

In this case, the gas insulated busbars 53, 53' are
Since it is attached to the side of the main member 51, that is, in contact with the outside air, the gas insulated bus bars 53, 53' can be expected to be cooled by the wind. It is also possible to restrain thermal expansion and contraction by attaching the material to the surface.

In addition, if the carrying current is large and therefore the thermal expansion and contraction is large, it is necessary to increase the suppressing force. Therefore, it is also necessary to insert a bellows into the container of the gas insulated bus bar.

Furthermore, in the power transmission tower with gas insulated busbars having such a configuration, the gas insulated busbars 53, 53' can be attached to the outside of the main member 51, so that the installation can be relatively easily performed.

Note that, as shown in the first embodiment, it is possible to extend the gas insulated bus bar to the top of the main material, and to provide a lightning arrester in place of the detention insulator. The other effects shown in the first embodiment are also present together with the effects specific to the second embodiment.

As described above, according to the present invention, it is possible to widen the line spacing of the power transmission line without increasing the size of the arms and without wind pressure deteriorating the seismic performance. Since the gas-insulated busbar bushings are installed at the top of transmission towers with gas-insulated busbars, cooling can be performed particularly effectively, especially when the gas-insulated busbars are extended to the top. It has many effects, such as not giving any impression of intimidation and being aesthetically pleasing.

Furthermore, when a lightning arrester is used as a detention insulator for power transmission line detention, the lightning protection problem of gas-insulated busbars can be solved, and the gas-insulated busbar can be directly attached to the steel tower.

In both of the above embodiments, the power transmission tower is
However, there is no need to limit it to X-shape, Y-shape, Y-shape, etc.
Alternatively, any shape may be used as long as the upper part is shaped like a U-shaped tuning fork and the upper part is branched and opened from the intersection.Also, the bushings and cross arms may be arranged at right angles to the hanging direction of the overhead power transmission line. In addition to being made to protrude in the direction, it may also be attached radially to the main material, and in either case, the same effects as those of the above-mentioned embodiments can be achieved.

[Brief explanation of the drawing]

FIG. 1A is a schematic cross-sectional view of a gas-insulated busbar, FIG. 1B is a cross-sectional view taken along the line 1B-1B, and FIG. Its front view, B is its side view, and Fig. 3 is a schematic general view of a conventional power transmission tower with gas-insulated bus bar, which is an improved version of the one shown in Fig. 2, A is its plan view, and B is its front view. 4 and 5 are side views, respectively. is a plan view, B is a front view, and C is a side view. 40...Transmission tower with gas insulated busbar; 41, 51
... Main material; 42 _-1 , 42 _-2 , 42 _-3 ... Bracelet; 4
3,52...intersection _{; 44-1,44-2,44-3 ...}
...Bushing; 45, 45', 53, 53'... Gas insulated bus bar; 46... Transmission line; 47... Detention insulator; 51 _-1 , 51 _-3 ... Leg; 51 _-2 , 51 _-4 ...
...Upper member.

Claims (1)

[Claims] 1. In a transmission tower with a gas-insulated bus bar, the transmission tower has an X shape, and the gas-insulated bus bar is arranged on a main member forming the X shape, and is fixed to the main member at its upper and lower ends. The arms and bushings that attach the power transmission line via the retaining insulator are movably supported at the intermediate part thereof, and are located above the X-shaped intersection of the power transmission tower and in a direction perpendicular to the hanging direction of the overhead power transmission line. The bushing and the gas-insulated busbar are arranged in the same vertical plane radially to the main material at a predetermined interval in the same direction and vertically, and the bushing and the gas-insulated busbar are located at the mounting position of the bushing to the main material. A power transmission tower with a gas insulated bus bar, characterized in that it is electrically connected at a position corresponding to the. 2. The power transmission with a gas insulated bus bar according to claim 1, wherein the gas insulated bus bar is disposed in the main material either in a cavity inside the main material or along the outside. Steel tower. 3. The arrangement of the gas-insulated bus bar to the upper main member is bent at the intersection of the X-shape to the upper member of the transmission tower on the same side as the side where the gas-insulated bus bar is introduced into the X-shaped leg of the transmission tower. A power transmission tower with a gas insulated busbar according to claim 1 or 2, which is arranged as follows. 4. The arrangement of the gas insulated bus bar to the upper main material is straight without bending at the intersection of the X-shape of the transmission tower, and is mutually shifted so as not to touch, so that the side introduced into the X-shape leg and the side introduced into the X-shape leg A power transmission tower with a gas insulated bus bar according to claim 1 or 2, which is disposed on the upper member on the opposite side. 5. The gas insulation according to any one of claims 1 to 4, wherein the gas insulation busbar provided on the main material extends further upward than the uppermost bushing. Transmission tower with busbar. 6. A power transmission tower with a gas-insulated busbar according to any one of claims 1 to 5, wherein the retaining insulator provided between the power transmission line and the cross arm is a lightning arrester.