JP2000023320A - Gas insulation switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the installation space of a device as a whole and to reduce cost by suppressing the leading space of overhead transmission lines to be compact, while a sufficient air insulation distance is secured without the use of attached equipment such as blocking coil and the like. SOLUTION: Anchor steel structures 2a and 2b are arranged close to bushings 1b and 1c, to which overhead transmission lines 8b and 8c are led in two front/ back stages. The anchor iron structure 2a is constituted higher than the anchor steel structure 2b. Supporting breakers 6a and 6b are installed on the upper part of the anchor steel structure 2a. Supporting breakers 4a and 4b are installed on the upper part of the anchor steel structure 2b. The supporting breakers 4a and 4b are positioned near the center of the anchor iron structure 2b with respect to the supporting breakers 6a and 6b. The overhead transmission line 8c supports the supporting breakers 4a and 4b, the overhead transmission line 8c supports the supporting breakers 5a and 5b, and the overhead transmission line 8b supports the supporting breakers 6a and 6b, so that they are respectively sandwiched from above and below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear in which a charging section is accommodated in a container filled with an insulating gas, and more particularly, to an improved arrangement of an overhead transmission line drawn into a bushing. The present invention relates to a gas insulated switchgear.

[0002]

2. Description of the Related Art In general, a gas insulated switchgear is a switchgear in which an insulating gas such as SF ₆ gas is filled in a pressure vessel and a high-voltage conductor serving as a charging section is accommodated in the vessel. The gas-insulated switchgear does not have the exposed charging part as the conventional air-insulated switchgear, and can obtain excellent insulation performance and arc-extinguishing performance by the insulating gas in the pressure vessel. Therefore, downsizing, downsizing, and simplification of the switchgear are easy. In addition, it has the advantage of ensuring safety and making maintenance and inspection easy because there is little external influence. According to the gas insulated switchgear with these advantages, it is possible to deal with the recent emphasis on difficulties in obtaining land for power plant and substation construction due to soaring land prices and environmental harmony with surrounding areas. . Therefore, in recent years, the demand has been increasing, and it has been applied to most switchgears.

[0003] By the way, gas insulated switchgear usually draws in a line of a substation via a bushing, and this line is still mainly an air-insulated overhead transmission line. Here, the configuration of drawing the transmission line into the gas insulated switchgear will be specifically described with reference to FIGS. 9 and 10.

As shown in FIGS. 9 and 10, a gas-insulated bus 7 is provided on the gas-insulated switchgear side, and bushings 1a, 1b, and 1c are connected to the gas-insulated bus 7. And these bushings 1a, 1b, 1c
The overhead transmission lines 8a, 8b, 8c are drawn in, and the gas-insulated bus 7 and the overhead transmission lines 8a, 8b, 8c are connected via the bushings 1a, 1b, 1c.

[0005] An anchoring iron structure 2 is arranged near the bushings 1a, 1b, 1c, and provided with supporting insulators (V suspension insulators) 9a, 9b. In addition, a blocking coil 10 is installed as an attached facility in the vicinity of the anchoring iron structure 2. Here, the overhead transmission lines 8a, 8b, 8c
Phase, S phase, T phase, R phase, T phase transmission line 8a,
8c is supported on the anchoring steel structure 2 by supporting insulators 9a and 9b,
The S-phase transmission line 8b is connected to the blocking coil 10
The fulcrum is connected to the terminated steel structure 2.

In the gas insulated switchgear described above, since the transmission lines 8a, 8b, 8c are air-insulated, it is necessary to secure a sufficient air insulation distance between the transmission lines 8a, 8b, 8c. No. Therefore, the bushings 1a, 1
The distance between the retaining points of the transmission lines 8a, 8b, and 8c in b and 1c and the length of the staying iron structure 2 are set large.

[0007]

However, the gas insulated switchgear described above has the following problems. That is, in recent years, large-capacity substations have been demanded along with an increase in power demand. However, when the substations have large capacities, the number of parallel lines connected to transmission lines increases. Therefore, in order to secure the air insulation distance, the interval between the anchoring points of the overhead power transmission line and the length of the staying iron structure had to be increased, and the space required for drawing in the transmission line increased. As a result, the installation space of the gas insulated switchgear as a whole has increased, no matter how much the size of the switchgear equipment has been reduced. In addition, if the number of parallel lines connected to the transmission line increases, ancillary equipment such as a blocking coil becomes indispensable, resulting in an increase in cost and an economic disadvantage.

The gas insulated switchgear of the present invention has been proposed to solve the above-mentioned problems of the prior art, and its purpose is to provide a sufficient airflow without using ancillary equipment such as a blocking coil. An object of the present invention is to reduce the installation space of the entire apparatus and the cost by reducing the space for drawing in the overhead transmission line while keeping the insulation distance.

[0009]

In order to achieve the above object, the present invention provides a gas insulated switchgear in which a plurality of bushings connected to an overhead power transmission line are connected to a main bus.
It has the following features. In other words, in the first aspect of the present invention, the pickup iron structures for two or more lines are arranged in two stages before and after the bushing, and the overhead transmission lines are connected to these pickup iron structures in the front-rear direction for each phase. And vertically supported. According to such a configuration, two or more transmission lines can be arranged in the front-rear direction and the vertical direction in a three-dimensional space, and a sufficient separation distance can be obtained. Therefore, it is possible to reduce the interval between the retaining points of the transmission line and the length of the staying iron structure while securing a desired air insulation distance between the transmission lines, and it is possible to reduce the space required for drawing in the transmission line. Further, the cost can be suppressed without using any additional equipment such as a blocking coil.

[0010] In the second aspect of the present invention, a tethered iron structure for two or more lines is arranged in one stage, and the overhead transmission line is supported by being shifted vertically in each phase with respect to the tethered iron structure. It is characterized by doing. According to such a configuration, by shifting the transmission lines for two or more lines in the vertical direction, it is possible to sufficiently secure a mutual separation distance between the transmission lines. It is possible to reduce the space between the points and the length of the stayed iron structure, and to save the space for drawing in the transmission line. In addition, since the one-stage steel structure is arranged, cost reduction can be further promoted.

[0011] Further, the invention according to claim 3 is based on claim 1.
Alternatively, in the gas insulated switchgear according to 2, the overhead transmission line is supported by being shifted in the horizontal direction for each phase with respect to the dead iron structure. According to this configuration, by disposing two or more transmission lines in a horizontal direction in a three-dimensional space, a separation distance between the transmission lines can be efficiently secured. Therefore, the space for drawing in the transmission line can be further reduced.

According to a fourth aspect of the present invention, in the gas insulated switchgear according to the first, second or third aspect, the overhead transmission line is supported from only below or only above the deadline structure. I do. According to this configuration, the means for supporting the transmission line can be simplified, and low cost can be realized.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the gas insulated switchgear of the present invention will be specifically described below with reference to the drawings.

(1) First Embodiment One embodiment including the inventions according to claims 1 and 3 will be described as a first embodiment according to the side view of FIG. 1 and the plan view of FIG. Will be described. The same members as those in the conventional example shown in FIGS. 9 and 10 are denoted by the same reference numerals,
Description is omitted.

(Configuration) First, the configuration of the present embodiment will be described. As shown in FIGS. 1 and 2, in the present embodiment, gas-insulated buses 3a, 3b are provided, and bushings 1a, 1b, 1c are connected to the buses 3a, 3b, respectively.
Of these, the bushings 1a and 1c are arranged symmetrically with respect to the axis of the busbars 3a and 3b. The bushing 1b is arranged perpendicular to the axis of the busbars 3a, 3b. Further, the bushings 1a, 1b,
1c, overhead transmission lines 8a, 8b, 8c are drawn in similarly to the conventional example.

The staying iron structures 2a, 2b are arranged in front and rear two stages in the vicinity of the bushings 1a, 1b, 1c. The staying iron structure 2a is arranged adjacent to the bushings 1a, 1b, 1c, and the bushings 1a, 1b,
An anchoring iron structure 2b is arranged on the side opposite to 1c. The stranded iron structure 2a is configured to be higher than the stranded iron structure 2b.

The support insulators 6a, 6
b is provided, and support insulators 4a, 4b and 5a, 5b (shown only in FIG. 2) are provided above the anchoring iron structure 2b. The vertical positional relationship of these support insulators is
The support insulators 4a, 4b and the support insulators 5a, 5b are horizontal, and the support insulators 4a, 4b and the support insulators 6a, 6b are arranged such that the latter is higher than the former (see FIG. 1). ). Further, the support insulators 4a, 4b and 5a, 5a
b is located closer to the center of the anchorage steel structure 2b with respect to the support insulators 6a and 6b (see FIG. 2).

The supporting insulators 4a and 4b have overhead transmission lines 8c.
However, an overhead transmission line 8c is supported by the supporting insulators 5a and 5b, and an overhead transmission line 8b is supported by the supporting insulators 6a and 6b, respectively, from above and below. That is, in the anchored iron frame 2b, the transmission line 8c is formed by the support insulators 4a and 4b.
Are supported, and the transmission line 8a is supported by the support insulators 5a and 5b. On the other hand, the support insulator 6
The transmission line 8b is supported at a position higher than the other two phases by a and 6c. The gas-insulated buses 3a and 3b are of the same form, and the transmission line lead-in form on the gas-insulated bus 3b side is symmetrically arranged with respect to the gas-insulated bus 3a side from the center of the anchored iron structures 2a and 2b. .

(Operation and Effect) The operation and effect of the first embodiment having the above configuration are as follows. That is, the support insulators 6a and 6b, which are support points of the transmission line 8b,
Support insulators 4a and 4b, which are support points for the transmission lines 8c and 8a
And 5a. Further, the supporting insulator 6
The support insulators 4a, 4b, 5a, and 5b are located on the center side of the anchorage steel structure 2b with respect to the support insulators a and 6b. Therefore,
Transmission lines 8a, 8b, 8c in a three-dimensional space,
By shifting vertically and horizontally, the transmission line 8
a, 8b, and 8c can be arranged while efficiently setting a separation distance between them.

As a result, it is possible to reduce the distance between the retaining points of the transmission line and the length of the staying iron structure while securing a desired air insulation distance between the transmission lines 8a, 8b, and 8c. As a result, the space for drawing in the transmission line can be kept compact, and the installation space of the entire apparatus can be reduced. In addition, since it is not necessary to use auxiliary equipment such as a blocking coil, cost can be reduced.

(2) Second Embodiment One embodiment corresponding to the second and third aspects of the present invention will be described as a second embodiment according to the side view of FIG. 3 and the plan view of FIG. Will be described. Note that the same members as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

(Structure) As shown in FIGS. 3 and 4, in the present embodiment, a single-stage staying iron structure 2 is arranged near bushings 1a, 1b, 1c, and overhead transmission lines 8a,
8b and 8c are supported by being shifted vertically and horizontally for each phase. More specifically, the support insulators 5a, 5b, 4
The overhead transmission lines 8a and 8c are supported by a and 4b, and the overhead transmission lines 8b are supported by support insulators 6a and 6b at a position higher than the other two phases. Also, the support insulator 4a,
4b, 5a, 5b, 6a, and 6b are all located closer to the center of the anchoring steel structure 2 (see FIG. 4). Note that FIG.
Reference numeral 11 in the drawing denotes a support insulator support for supporting the support insulators 4a and 6b.

(Operation and Effect) The operation and effect of the second embodiment having the above configuration are as follows. That is, by shifting the transmission lines 8a, 8b, 8c in the vertical direction and the horizontal direction, the transmission lines 8a, 8b, 8c can be arranged while efficiently keeping a separation distance therebetween. Therefore, it is possible to reduce the interval between the retaining points of the transmission line and the length of the staying iron structure, and it is possible to reduce the space for drawing in the transmission line. In addition, since there is no need to use auxiliary equipment such as a blocking coil, the cost is reduced. In addition, in the second embodiment, since the anchoring iron structure 2 is arranged in one stage, the anchoring iron structure is moved forward and backward by two steps.
The cost can be further reduced as compared with the first embodiment in which the tiers are provided.

(3) Other Embodiments The present invention is not limited to the above embodiments, and the mutual combination of the supporting directions, the arrangement direction, and the like can be appropriately changed. The number of lines can be freely increased or decreased.

For example, as one embodiment corresponding to the first and fourth aspects of the present invention, as shown in FIG. 5, the structure of the first embodiment is substantially the same as that of the first embodiment. Among them, there is a structure in which the support insulator 4 on the side of the terminated iron structure 2b supports the transmission line 8c only from below. In addition, as shown in FIG. 6, it is possible to propose a structure in which the support insulator 4 on the side of the anchorage iron structure 2b supports the transmission line 8c only from above.

Further, as one mode corresponding to the second and fourth aspects of the present invention, as shown in FIG. 7, the configuration of the second embodiment is substantially the same as that of the second embodiment. Some support insulators 4 and 6 support the transmission lines 8c and 8b only from below. As shown in FIG. 8, the support insulators 4 and 6 on the anchored steel structure 2 are connected to the transmission line 8 only from above.
c and 8b are also included.

According to these other embodiments, the same operation and effect as those of the first and second embodiments can be obtained, and the transmission line is supported from one side, so that the configuration is simplified. This has the effect of being able to realize low cost.

[0028]

As described above, according to the gas insulated switchgear of the present invention, an extremely simple structure, such as supporting an overhead power transmission line in a phase-shifted manner with respect to a dead-end iron structure, allows a blocking coil or the like to be used. The space for drawing in overhead power transmission lines could be kept compact while securing sufficient air insulation distance without using ancillary equipment, and the installation space and cost of the entire device could be reduced.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of the present invention.

FIG. 2 is a plan view showing the first embodiment of the present invention.

FIG. 3 is a side view showing a second embodiment of the present invention.

FIG. 4 is a plan view showing a second embodiment of the present invention.

FIG. 5 is a side view showing another embodiment of the present invention.

FIG. 6 is a side view showing another embodiment of the present invention.

FIG. 7 is a side view showing another embodiment of the present invention.

FIG. 8 is a side view showing another embodiment of the present invention.

FIG. 9 is a side view showing an arrangement example of a conventional gas insulated switchgear and a staying iron structure.

FIG. 10 is a plan view showing an arrangement example of a conventional gas insulated switchgear and a staying iron structure.

[Explanation of symbols]

1a, 1b, 1c: bushing 2, 2a, 2b: iron iron structure 3a, 3b, 7 ... gas-insulated bus 4, 4, 4a, 4b, 5, 5a, 5b, 6, 6a, 6b, 9
a, 9b: Support insulator 8a, 8b, 8c: Overhead transmission line 10: Blocking coil 11: Support insulator support

Claims (4)

[Claims] 1. A plurality of bushings are connected to a main bus,
In the gas-insulated switchgear in which an overhead transmission line is led into these bushings, two or more lines of the closed iron structures are arranged in front and rear two stages in close proximity to the bushings, and A gas insulated switchgear, wherein overhead transmission lines are supported by being shifted in the front-rear direction and the vertical direction for each phase. 2. A plurality of bushings are connected to the main bus,
In the gas-insulated switchgear in which an overhead transmission line is led into these bushings, a single-stage ironing structure for two or more lines is arranged in proximity to the bushing, and A gas insulated switchgear, wherein electric wires are supported by being shifted vertically in each phase. 3. The gas insulated switchgear according to claim 1, wherein the overhead transmission line is supported in a phase-shifted manner in each phase with respect to the anchoring iron structure. 4. The gas insulated switchgear according to claim 1, wherein the overhead transmission line is supported only from below or only from above with respect to the anchorage steel structure.