JPS6130484B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a closed-type switchgear that uses a highly insulating medium such as SF ₆ gas in combination with an air-insulated double-bus system, and is a switchgear system that reduces the installation area and reduces costs. This invention relates to a technology for improving equipment and the arrangement of overhead busbars. In response to the recent situation of increasing electricity demand and increasing density, on the other hand, in response to the difficulty in obtaining land and opposition to construction due to soaring land prices, pollution, aesthetics, etc. It was developed in response to demands for improved reliability and safety, using SF ₆ gas with high dielectric strength as the insulating medium, and housing the switchgear in a grounded metal case, compared to conventional air insulation equipment. This is a gas-insulated switchgear that has been dramatically downsized. If this gas equipment were fully adopted, the power transmission and reception equipment would become even more compact, but since the expensive bus bars would occupy a considerable weight, it would be better to use an inexpensive overhead bus bar for the bus bar and gas insulate the equipment. method is often used. An object of the present invention is to provide a power transmitting and receiving device using such a combination method that can be further downsized. The present invention provides a power transmission/reception device that combines an air-insulated double busbar and a gas-insulated switchgear configured with a bow disconnector, a disconnector, and other switches, in which four bus-side gas disconnectors for two circuits are installed. are combined with connecting gas busbars to form a rectangular shape, bushings are provided between the disconnectors connected to the same overhead busbar, connecting gas busbars are provided between the disconnectors on the opposite side, and the busbars are connected to the same overhead busbar. It is characterized in that it comprises at least one arrangement connected to a gas insulator and a disconnector via a gas insulator and a disconnector. Hereinafter, the present invention will be explained while comparing it with a conventional example.
FIG. 1 shows a single-line connection diagram of a conventional double-bus type power transmitting and receiving device described in FIGS. 2 and 3. FIG. Figure 1a is for the 1A/1B system, and Figure 1b is for the 1A/2B system. In the diagram, 1 is a gas line disconnector, 2 is a busbar side disconnector, and 3
is the power line side disconnector. Note that A is the power transmission line circuit (line line), B is the transformer circuit (bank circuit), and C
denotes a bus line, and D denotes a bus division circuit, respectively. Figure 2 shows an example of the configuration of a part of the power transmission/reception equipment of the 1A/1B system shown in Figure 1a. 2
Figure b is a plan view of the aerial bus lines A and B.
FIG. 2c is a side view of the power transmission line and transformer line. In this conventional example, the busbar side disconnector 2 is air-insulated, and the transmission line-side disconnector is gas-insulated. In combination with the bushing 4 and the bushing 4, it can also be connected to the gas insulator and disconnector 1 through a connecting gas bus bar. However, this is not a good layout because it requires a large amount of expensive gas busbars. The 1A/1B system shown in Fig. 2 is a layout that is mainly adopted in elongated rectangular sites where the number of lines is small or there is space in the axis direction of the overhead bus. This is called a single drawer method. FIG. 3 is a partial configuration example of the power transmitting and receiving device of the 1A/2B system shown in FIG. 1b. Figure 3a shows a single-line connection diagram of power transmission line A and transformer line B, Figure 3b is a plan view of overhead bus lines Otsu ₁ , A, and Otsu ₂ , and Figure 3c shows the transmission line and transformer line. FIG. 3 is a side view of a transformer line. This 1A/2B system has two sets of Otsu bus lines,
This is a layout in which power transmission line lines, transformer lines, bus link lines, transformer lines, etc. are arranged symmetrically around the overhead bus line, and the space in the axial direction of the overhead bus line is shortened as much as possible. This is called a double drawer method. Similar to the 1A and 1B types shown in FIG. 2, the air-insulated busbar side disconnector 2 may be replaced by a gas disconnector, but this has the disadvantage of being expensive. Next, the installation areas of the power transmitting and receiving devices shown in FIGS. 2 and 3 will be compared. As shown in Figures 2b and 3b, if the lengths of each section in the direction perpendicular to the overhead bus axis are X and Y, and the length of each section in the direction of the overhead bus axis is Z, then The installation area S in this case is S=4Z(X
+Y), and if Y=Z=2X, then S= _24X2 . Further, the installation area S in the case of FIG. 3 is expressed as S=Z(2X+3Y), and if Y=Z=2X, then S= ^16X2 . Therefore, the installation area of the power transmitting and receiving device in FIG. 3 is 2/3 that of that in FIG. 2. In any case, this conventional method requires a considerable amount of installation space. The present invention aims to provide a power transmitting/receiving device that has a smaller installation area than these conventional examples and can be arranged compactly. FIG. 4 shows a single line diagram of the embodiment of the invention described below. The power transmitting and receiving device of the present invention is shown in FIG.
It has exactly the same functions as the power transmitting and receiving device shown in
The 1A/1B system is intended to be a dual withdrawal system similar to the 1A/2B system. In other words, the aerial busbar is reduced in size both in the axial direction and in the orthogonal direction. A first embodiment of the present invention is a case where an air-insulated double busbar, that is, an overhead busbar is arranged horizontally. FIG. 5 shows a configuration in which both the power transmission line line and the transformer line are drawn out, and FIG. 6 shows a configuration in which both the bus link line and the transformer line are drawn out. Fig. 5a is a single line diagram of the power transmission line line A and transformer line B, Fig. 5b is a plan view of the overhead busbar, Fig. 5c is a plan view of the gas insulated equipment section, and Fig. 5b is a plan view of the overhead busbar.
Figure d is a side view of the power transmission line/transformer line. The overhead bus lines A and O are arranged horizontally as shown in Figure 5b. The four busbar-side gas disconnectors 5, 6, 7, and 8 for two lines and the connecting gas busbar 9 are formed in a rectangular shape in a direction perpendicular to the overhead busbar. That is, the bus-side gas disconnectors 5 and 6 connected to the same overhead bus line Aa are connected to each other by the connecting gas bus line 9. Similarly, the bus-side gas disconnectors 7 and 8 connected to the overhead bus Ota are connected to each other by a connecting gas bus 9. Bushings 4 are provided between bus-side gas disconnectors 5 and 6 and between bus-side gas disconnectors 7 and 8, which are connected to the same overhead bus. After these bushings,
The connection gas busbars 9 are connected to the overhead busbars Aa and Ba, respectively. A connecting gas bus 10 connects the disconnectors 5 and 7 located on opposite sides.
Connect by. Similarly, disconnectors 6 and 8 are interconnected by a connecting gas bus 11. A connecting gas bus 10 is connected to a line-side gas sheath disconnector 1, and a line-side gas disconnector 3 and a pushing 4 are connected to this sheath disconnector. On the other hand, the connection gas bus 11
is connected to the gas line disconnector 1 of the transformer line, and the pushing 4 is connected to this line disconnector. The arrangement of the gas shield disconnectors for two lines, that is, the gas shield disconnector 1 for the power transmission line line and the gas shield disconnector 1 for the transformer line, is arbitrary, but as shown in Figure 5c, They can also be arranged substantially linearly in a direction perpendicular to the generatrix. The above has described the equipment connected to the overhead bus lines Aa and Otsu a, but the configurations of the equipment connected to the other overhead bus lines are also exactly the same. In addition, in FIG. 5c, the bus-bar side gas disconnectors are shown with reference numerals 5, 6, 7, and 8 for the sake of explanation, but the 5th
This is represented by the reference numeral 2 in Figure a. In the drawings showing the following embodiments, the reference numeral 2 is used uniformly for the busbar side gas disconnector. Installation area S for the above power transmission lines and transformer lines
is expressed as S = 2YZ, where if Y = Z = 2X, S = 8X ² , and the installation area is approximately half that of the conventional example shown in Figure 3, making the switchgear equipment more compact. . In addition, in the conventional example, the connection between the busbar side disconnector and the busbar disconnector is as shown in Figures 2c and 3c.
The power transmission/reception device of the present invention is constructed by connecting between the overhead busbars and the top of the overhead busbar, so the height of the overhead busbar steel structure is also reduced by approximately 2/2.
3, and the installation volume is approximately 1/3 compared to the conventional example shown in Fig. 3. This is because the installation area will be 1/2 and the height of the steel structure will be 2/3. This makes the steel structure more economical and compact in length, width, and height, making it easier to harmonize with the surrounding environment. The bus link line/transformer line can also have the same configuration as the power transmission line line/transformer line. Figure 6a
shows a single line diagram of the bus line C and the transformer line B. FIG. 6b is a plan view showing a modification of the bus line; if the gas line disconnector 1 of the bus line is placed on the transformer line side, the connecting gas bus 9 can be shortened; More economical. FIG. 6C is a plan view of the equipment section of the bus line and transformer line using the modification shown in FIG. 6B. The configuration examples in Figures 5 and 6 are for power transmission lines and
This is a case where both the transformer line and the bus line/transformer line are drawn out, but the same applies to the combination of the transformer line and the bus line, or the transformer line and the transformer line. Although only the main equipment is shown in the above first embodiment, it goes without saying that the above configuration can be easily realized even if a grounding device, a lightning arrester, a current transformer, a voltage transformer, etc. are included. A second embodiment of the present invention is a case where the overhead busbar is arranged vertically. FIG. 7 shows an example of the configuration of the power transmission line A and the transformer line B of this embodiment.
Figure 7a is its single line connection diagram, Figure 7b is a plan view of the overhead busbar, and Figure 7c is the U of Figure 7b.
-It is a side view seen in the U-line direction, and FIG. 7d is a side view of the seventh
It is a side view seen in the VV line direction of figure b. In the figure,
12 is a bus bar support insulator. The installation area S of the power transmission line line and transformer line shown in Fig. 7 is expressed as S = 5/4YZ, and if Y = Z = 2X, then S = 5X ² , and the configuration example in Fig. 5. In comparison, the installation area is approximately 5/8 of that. Therefore, by arranging the overhead busbar vertically, the installation area can be further reduced. Further, the number of expensive connection gas busbars connecting the busbar side disconnections is reduced to about 1/2 compared to the configuration example shown in FIG. 5. The height of the steel structure for the overhead busbar will be higher than in the configuration example shown in Figure 5, but the width will be narrower, so the amount of material for the steel structure will be the same as in the configuration example shown in Figure 5. Become. FIG. 8 shows an example of the configuration of the bus line C and transformer line B in the second embodiment. FIG. 8a is a single line diagram thereof, and FIG. 8b is a plan view of the equipment section. FIG. 9 shows an example of the configuration of the bus section line D in the second embodiment, and FIG.
Figures b and c are side views of the bus section line. In the embodiments shown in FIGS. 8 and 9, similar effects such as reduction in installation area can be obtained as explained in FIG. 7. FIG. 8 shows an example of the configuration of the bus line C and transformer line B in the second embodiment. FIG. 8a is a single line diagram thereof, and FIG. 8b is a plan view of the equipment section. FIG. 9 shows the bus section line D in the second embodiment.
An example of the configuration is shown below. FIG. 9a is a single line diagram thereof, and FIGS. 9b and 9c are side views of the bus section line. Also in the configuration examples shown in FIGS. 8 and 9,
The same effect as explained in FIG. 7 can be obtained. The installation area and installation volume of the first embodiment (Fig. 5, Fig. 6) and the second embodiment (Fig. 7, Fig. 8, Fig. 9) are 1A/1B system and 1A/2 system. A comparison with the conventional example of the B method is shown in the following table. Here, The installation volume of each power receiving device is shown.

[Table] Since power transmission and reception equipment that uses the overhead bus system is generally an outdoor substation, height is relatively unimportant.
Reducing the installation area is an important factor. In other words, in the first embodiment, the installation area is 1/3 to 1/3 compared to the conventional example.
The size becomes 1/2, and in the second embodiment, it becomes 1/5 to 1/3, making it possible to achieve considerable compactness. Therefore, it becomes easier to obtain land for a substation, and costs such as equipment costs, land costs, and land preparation costs can be reduced.

[Brief explanation of the drawing]

Figure 1 is a single line diagram of a power transmitting and receiving device according to the prior art, Figure 2 is a diagram showing an example of the 1A/1B system according to the prior art, and Figure 3 is an example of the 1A/2B system according to the prior art. 4 is a single line diagram of the power transmitting and receiving device of the present invention, FIGS. 5 and 6 are diagrams showing an embodiment of the present invention in which the overhead bus bar is arranged horizontally, and FIGS. 7 to 9 are It is a figure which shows the Example of this invention when an overhead busbar is vertically arranged. 1... Gas line disconnector, 2... Busbar side disconnector, 3... Transmission line side gas disconnector, 4... Pushing, 5, 6,
7, 8... Bus bar side gas disconnector, 9, 10, 11... Gas bus for connection, 12... Bus bar support insulator, A... Power transmission line line, B... Transformer line, C... Bus link line, D... Bus bar division line .

Claims (1)

[Scope of Claims] 1. In a power transmission/reception device that combines an air-insulated double busbar and a gas-insulated switchgear configured with a switch such as a shield disconnector or a disconnector, a gas disconnection on the busbar side for two circuits is provided. four units are combined with a connecting gas bus to form a rectangular shape, a bushing is provided between each of the disconnectors connected to the same overhead bus, and a connecting gas bus is provided between each of the disconnectors on the opposite side. A power transmitting and receiving device characterized by comprising at least one set of a gas liner and a disconnector connected through the bus bar. 2. The power transmission and reception device according to claim 1, characterized in that gas disconnectors and disconnectors for two circuits are arranged substantially in a straight line via the bus-side gas disconnector. 3. A power transmitting and receiving device according to claim 1 or 2, characterized in that the air-insulated double bus bar is arranged horizontally or vertically.