JPS6349445B2 - - 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 its 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 installed near roads such as elevated bridges. The feeling of intimidation becomes even greater, which is not desirable. Also,
On the other hand, if bushings were to be installed at a high position, the reinforcement of the transmission tower would have to be extremely strong, and the result would be extremely uneconomical and unacceptable. It has some drawbacks that make it worthless.

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

The present invention eliminates these various conventional drawbacks, is compact, has good earthquake resistance and wind pressure resistance, and
The purpose is to provide a power transmission tower with a gas-insulated busbar that does not give an intimidating feeling to the surrounding area and is aesthetically excellent.

In order to achieve this object, the present invention has a structure in which the gas-insulated busbar drawn in from the lower gas-insulated busbar inlet rises inside the main member of the power transmission tower to form a vertical section, and the air can freely circulate around the vertical section. The bushing is located near the arm for holding the power transmission line that protrudes from the side of the transmission tower with the gas-insulated busbar, and is located in the same vertical plane and in the same direction as the arm for the power transmission line with the gas-insulated busbar. The gas insulated bus bar, which is provided to overhang from the side of the steel tower and rises inside the main member, is connected to the bushing at a position corresponding to the mounting position of the bushing, and is restrained by the main member at the same position, and is connected to the bottom bushing. The gas insulated busbar below is configured to be suspended from the main material.

Hereinafter, the present invention will be explained based on FIG. 3 of the accompanying drawings showing one embodiment thereof.

In the figure, reference numeral 30 denotes a hollow main member of the power transmission tower, and after the gas insulated bus 31 is drawn in from the lower gas insulated bus inlet 32 provided at the lower part, the gas insulated bus 31 is inserted into the hollow part of the main member 30. is installed vertically.

On the other hand, on the top of the main material 30 of the power transmission tower, the main material 3
A desired number of arms 33, for example, 33 _-1 , 33 _-2 , 33 _-3 are provided extending in a direction perpendicular to 0, that is, horizontally, and these arms 33 _-1 , 33
Bushings ₃₅ -1 , 35 -2 , 35 are installed in the vicinity of _-2 , 33 _-3 in almost the same vertical plane and in the same direction, with a sufficient withstand voltage distance _from other power transmission lines 34.
_-3 is provided to overhang from the main member 30.

Each bushing 3 provided in this way
At 5 _-1 , 35 _-2 , 35 _-3 , the gas insulated busbar 31 rising up in the cavity of the main material 30 is located at the mounting position of each bushing 35 _-1 , 35 _-2 , 35 _-3. are connected and pulled out at positions P ₁ , P ₂ , and P ₃ corresponding to . In addition, the gas insulated bus bar 31
are fixed to the main member 30 at positions P ₁ , P ₂ , and P ₃ , and the gas insulated bus bar 31 below the lowest bushing, for example, bushing 35 _-3 , is fixed to the main member 30 at positions P 1 , P 2 , and P 3 .
It is suspended at P ₃ and is configured to release the expansion and contraction between them to the bottom, and the bushing 3
Expansion and contraction of the gas insulated busbar 31 between 5 _-1 , 35 _-2 and 35 _-3 is restrained by the above-mentioned fixation to the main member 30.

Further, in the above embodiment, a plurality of arms 3
3 are installed in almost the same vertical plane, but it is not necessarily limited to this, and they may be installed radially with respect to the main member 30, and the uppermost end of the vertical part of the gas insulated bus bar 31 It is located at a position corresponding to the topmost bushing, but of course it may be extended above the top bushing to increase the cooling effect by cooling with outside air from a higher place. .

Note that the power transmission line 34 is connected via a detention insulator 36,
It is fixed to each cross arm _33-1 , _33-2 , _33-3 , and the power transmission line 34 and bushings _35-1 , _35-2 , 3
5 _-3 is electrically connected by a jumper wire 37. Also, instead of this retaining insulator 36,
It is also possible to provide a lightning arrester, and in particular, by providing a plurality of lightning arresters in parallel, it is possible to prevent the power transmission line from falling due to the unexpected failure of the lightning arrester.

The power transmission tower with a gas insulated bus bar of the present invention is configured as described above, but if it is required to increase the current rating of the gas insulated bus bar 31, the amount of heat generated by the gas insulated bus bar will increase, Therefore, thermal expansion and contraction due to this becomes large, requiring countermeasures against the thermal expansion and contraction, and may also cause problems in terms of power transmission capacity. In such a case, in addition to the configuration of the present invention described above, the lower gas insulated bus inlet 32
The size of the main member 30 of the power transmission tower is made larger than the size required to draw in the gas insulated bus bar 31 that is drawn through this to allow sufficient air circulation, and the top of the main member 30 of the power transmission tower is opened to allow the lower part of the main member 30 to be opened. By providing an opening 38 that communicates with the cavity of the main member 30 in which the gas insulated bus inlet 32 and the vertical portion of the gas insulated bus 31 are housed, the opening 38 and the cavity of the main member 30 that communicate vertically are created. Utilizing the chimney action of the upper and lower gas insulated bus inlet ports 32, the heat generated from the gas insulated bus and the temperature rise around the gas insulated bus due to external temperature are cooled down by the active upward airflow caused by the chimney action. You can also.

Furthermore, instead of the natural ventilation method that utilizes such rising air currents, a blower such as a fan or compressed air is installed near the lower gas insulation inlet 32 to forcibly take in outside air. ,
The above cooling effect can be made even more remarkable.

Since the power transmission tower with a gas-insulated busbar of the present invention is configured in this way, it is possible to reduce the number of armrests and to make it smaller and lighter in weight.Therefore, the earthquake resistance and wind resistance of the power transmission tower are improved, and the power transmission tower is improved. The required dimensions of the tower's components can be reduced, reducing manufacturing costs, and it also has the advantage of allowing gas-insulated busbars to be attached to high-height power transmission towers, such as those used for ultra-super high voltage systems. .

Moreover, since the arms are short, the installation space can be much narrower than that of conventional power transmission towers, and is almost the same as the case of only power transmission towers. It also has the effect of making it possible to apply it to power transmission towers.

In addition, since the bushings are mounted at high places, they feel less intimidating to the ground, and even when placed on roads such as viaducts, the bushings feel less intimidating and do not affect people's feelings.

Furthermore, since the gas-insulated busbar is restrained by its strong main material in the transmission tower, there is no problem with thermal expansion and contraction between the bushings, and the bottom of the lowest bushing is also suspended. Furthermore, it is possible to avoid the problem of thermal expansion and contraction by providing an opening at the top and bottom, for example, an opening B and an expanded lower gas insulated bus bar inlet, or by providing an air blower in addition to this, or, If the gas insulated bus bar is extended above the top bushing, cooling of the gas insulated bus bar can be done very effectively, and problems with thermal expansion and contraction and power transmission capacity can be avoided even when carrying large currents. It also has the effect of being able to be avoided.

The power transmission tower with a gas-insulated bus bar configured in this way is aesthetically superior, and has the effect of being more in harmony with the environment.

[Brief explanation of drawings]

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,
FIG. 3 is a schematic overall view of an embodiment of a transmission tower with a gas-insulated busbar according to the present invention, and A is a plan view thereof;
B is its front view, and C is its side view. 1... Container; 2... Conductor; 3... Insulating spacer; 4... Insulating gas; 30... Main material; 31...
Gas insulated busbar; 32...Lower gas insulated busbar inlet; 33 _-1 , 33 _-2 , 33 _-3 ...Archive; 34...
Transmission line; 35 _-1 , 35 _-2 , 35 _-3 ... Bushing; 36 ... Detention insulator; 37 ... Jumper wire;
38...Opening; _P1 , _P2 , _P3 ...Position.

Claims (1)

[Claims] 1. In a power transmission tower on which a gas insulated bus bar is installed, the gas insulated bus lead in from the lower gas insulated bus inlet rises inside the main member of the power transmission tower to form a vertical part. At the same time, air can freely circulate around the bushing, and the bushing is located near the arm for holding the power transmission line, which is installed protruding from the side of the transmission tower with a gas-insulated busbar, and is located in the same vertical plane as the arm. The gas insulated bus bar, which is provided to protrude from the side of the transmission tower with gas insulated bus bar and rises inside the main member, is connected to the bushing at a position corresponding to the mounting position of the bushing, and is connected to the main member at the same position. A power transmission tower with a gas insulated bus bar, characterized in that the gas insulated bus bar below the lowest bushing is suspended from the main material. 2. The lower gas insulated bus inlet, which brings the gas insulated bus into the main material of the transmission tower with gas insulated bus, will be made large enough to allow sufficient air circulation, and the lower gas insulated bus inlet and gas insulated bus inlet will be A power transmission tower with a gas-insulated busbar according to claim 1, wherein an opening communicating with the inside of the main member in which the vertical portion is housed is provided at the top of the power transmission tower with a gas-insulated busbar to allow free circulation of air. . 3 A blower device is installed to force the flow of air through the lower gas insulated bus inlet, the inside of the main material in which the vertical part of the gas insulated bus is housed, and the flow path communicating with the opening. A power transmission tower with a gas insulated bus bar according to claim 2. 4. The power transmission tower with a gas-insulated busbar according to claim 2 or 3, wherein the flow path through which air flows is formed by a hollow passage formed inside the main material. 5. Claims 1 to 4, wherein the vertical part of the gas insulated bus bar rising inside the main member of the transmission tower with gas insulated bus bar extends above the uppermost bushing. A power transmission tower with a gas-insulated busbar as described in any of the above.