JP4686392B2 - Gas insulated switchgear - Google Patents

Description

  The present invention relates to a gas-insulated switchgear having a layout configuration of a 1-1 / 2 circuit breaker system.

  In general, in an electric station to which a gas-insulated switchgear (hereinafter abbreviated as GIS) is applied, when performing a layout configuration of a 1-1 / 2 circuit breaker system, as shown in FIG. 1C or 1D to 1F are arranged in series on the same axis of in-line main buses 2A and 2B.

  Lines 6 and 7 in which three circuit breakers 1A to 1C and 1D to 1F are arranged on the same axis of the main buses 2A and 2B in the line are parallel to the drawing line 8 such as a transmission line or a transformer line on a plane. The lines 6 and 7 are arranged in parallel on each plane.

  Between the lines 6 and 7, the ends of the lines 6 and 7 are connected to each other via a main bus switching disconnector 5 that can be connected to or disconnected from any main line connecting main buses 3A and 3B. Connected by bus 3.

  The lead-out line bus 4 constituting the lead-out line such as a power transmission line or a transformer line is connected to the line 6 so as to avoid the gas circuit breakers 1A to 1C or 1D to 1F so as not to obstruct maintenance / repair work of the circuit breaker. A branch is provided between the circuit breakers 1A and 1B constituting the line 6 or between the circuit breakers 1B and 1C, or between the circuit breakers 1D and 1E constituting the line 7 or between the circuit breakers 1E and 1F. It is drawn from each line 6 and 7.

  For the sake of brevity in FIG. 5, among the GIS components, only the circuit breaker, disconnector, and busbar necessary for explanation are shown, and the earthing switch, instrument transformer, instrument current transformer, lightning arrester, etc. are described. Is omitted.

  When applying the GIS layout of the 1-1 / 2 circuit breaker system as described above, the circuit breakers 1A to 1C or 1D to 1F of the lines 6 and 7 are arranged on the same axis, and the lines 6 and 7 are connected to each other. Since they are arranged in parallel, the depth (width) per line is increased, which is one of the factors that increase the space required for installation. In the case of indoor type GIS, a wide building is required.

  The lead-out bus 4 of the lead-out line such as a transmission line or transformer line needs to be arranged avoiding the maintenance space above the circuit breakers of the lines 6 and 7, and cannot be arranged above the circuit breakers. Therefore, it must be arranged between the lines 6 and 7. As a result, a large space between the lines is required for the arrangement of the line lead-out bus 4, which is one of the factors that increase the space required for installation. The main buses 3A and 3B are long and disadvantageous from the viewpoint of economy.

  Further, since the lines 6 and 7 are arranged in parallel to the direction of the transmission line line and the lead of the transformer lead line 4, it is necessary to change the direction of the lead line bus 4 to an angle of 90 degrees. Required a drawer busbar configuration unit.

  As described above, in the conventional layout, a large space has to be secured for installing the GIS, which is disadvantageous in terms of economy, such as an increased installation space and an increased inter-line connection main bus. .

  In addition, when the circuit breakers placed on the lines 6 and 7 need to be pulled out of the line due to maintenance, repairs, etc., the breaker cannot be pulled out of the line directly, and the adjacent equipment is disassembled and pulled out. It was necessary, and work efficiency for inspection and repair was poor.

From this point of view, Patent Document 1 discloses that in the 1-1 / 2 circuit breaker type gas insulated switchgear, the line connecting main buses are arranged horizontally and a vertical circuit breaker is provided in the longitudinal direction of the main bus bars. An invention is described in which the installation area is reduced by juxtaposition. However, the invention described in Patent Document 1 has the following problems to be solved and is not excellent in practicality.
JP 58-006013 A

  Substation configurations include single bus systems, multiple bus systems, and 1-1 / 2 circuit breaker systems. The economic comparison is approximately 1: 1.2: 1.5 per line. This is because three of the most expensive circuit breakers among the component devices are used for two lines in the case of the 1-1 / 2 circuit breaker system. For this reason, the 1/1/2 circuit breaker type substation has been mainly used as a construction of a highly important substation, that is, a high voltage, large capacity substation because of the construction cost.

  On the other hand, the characteristics of the GIS viewed from the tank structure tend to change from a three-phase device to a single-phase device as the voltage increases from a low voltage. In general, three-phase devices have been adopted for GIS size reduction and economic efficiency, but because the three-phase voltage equipment is housed in the same tank, the electric field stress becomes severe, and the tank size increases as the voltage increases. This is because technical difficulties such as increasing the size of the insulating support are added and the overall economy is under pressure.

  Also, in the unlikely event of an accident, the impact range extends to all three phases, so the recovery time and cost will increase, and there is a strong demand for a single phase at important substations where long-time power outages are not allowed. In other words, high-voltage, large-capacity substations generally use single-phase devices. By the way, in the world, three-phase devices are mainstream in GIS with a voltage of 145 kV or less, but most of them are single-phase devices at 420 kV or more.

  In this way, even though the construction cost of the 1-1 / 2 circuit breaker system is high, it is used in very important substations with high voltage and large capacity, and the GIS used there is only one. There are many phasers.

  Looking at the invention of Patent Document 1 under such a technical background, the main bus line of the invention of Patent Document 1 is a three-phase device. Therefore, in the invention of Patent Document 1, if it is assumed that the main buses 1 and 2 are configured by single-phase buses, either three buses are arranged in the vertical direction or three buses are arranged horizontally. Or a combination of both.

  However, in the case of the three vertical arrangements, the width dimension does not increase. However, in actuality, the connecting bus descending from the circuit breaker interferes with the second and third phase buses and cannot be connected. For this reason, although it becomes horizontal arrangement | positioning, each of the single-phase bus | bath of a main bus line is 3 in total, a total of 6 will be located side by side, and the width dimension will extend significantly.

  This is the same for the connecting bus. Since the connecting bus from the circuit breaker comes out horizontally, the single-phase bus of the connecting bus must be arranged vertically. If this happens, it will extend significantly in the height direction. This is far from the reduction effect that this proposal is trying to solve.

  The present invention has been proposed in order to solve the above-described problems of the prior art, and the object thereof is to arrange a circuit breaker facing the main line between lines and connect each line to the same axis. By arranging it above, it is intended to provide efficient equipment / bus arrangement GIS, reduce the site area and shorten the bus length, and improve the maintenance / recovery efficiency of the circuit breaker.

In order to achieve the above-mentioned goal, the gas insulated switchgear of the present invention comprises first and second lines connected via an inter-line connecting main bus, and each of the first and second lines has The first, second, and third circuit breakers are electrically connected in series via the first and second in-line connection buses, and one end of each of the first and third circuit breakers is connected to the main line between lines. And a lead-out line is derived from between the first circuit breaker and the second circuit breaker in the first in-line connection bus and between the second and third circuit breakers in the second in-line connection bus. In the 1-1 / 2 circuit breaker type gas insulated switchgear, the first and second in-line connecting buses, lead-out buses, each circuit breaker and inter-line connecting main buses are configured by single-phase devices, respectively. and the first and second lines in the connection bus, its definitive drawer busbar and bridging main bus Parallel disposed in the generating line of the three phases, respectively on the same water plane, for the first and second lines in the connecting bus bars and bridging main bus, yet each phase of the bus of the main shaft in the same direction The first and second in-line connection buses and the inter-line connection main buses are arranged so as to overlap each other so as to substantially overlap in a plane, and the lead-out buses are connected to the first and second in-line connection buses. And in the direction intersecting with the main axis direction of the connection main bus line between the lines and so as to overlap vertically with the first and second in-line connection bus lines and the inter-line connection main bus line, in the first line, The upper lead of the first breaker and the upper lead of the second breaker are connected to the first in-line connection bus, and the lower lead of the second breaker and the lower lead of the third breaker are connected to the second line. Connected to the internal connection bus, the lower lead of the first circuit breaker of the first line and the first The lower lead of the third circuit breaker of the first line is connected to the inter-line connection main bus, and the upper lead of the third circuit breaker of the first line and the upper lead of the first circuit breaker of the second line are connected. It is characterized in that it is connected to the main connection bus .

  In the gas insulated switchgear of the present invention having the above-described configuration, each of the first and second in-line connecting buses, the lead-out buses, each circuit breaker, and the inter-line connecting main buses is constituted by a single-phase device, By using the first to third circuit breakers of the circuit as vertical circuit breakers, it is possible to stack each bus bar.

  According to the present invention, it is possible to reduce the depth (width) dimension of the entire apparatus by arranging the main bus groups in a stacked manner. In addition, since a single-phase device is used as the main bus group and the circuit breaker, the advantage of downsizing the entire device is ensured as compared with the device of Patent Document 1 that presupposes a three-phase collective type device. Voltageization and easy maintenance and inspection work can be achieved.

  Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 is a plan view of this embodiment, FIG. 2 is a front view thereof, FIG. 3 is a side view of a vertical circuit breaker portion, and FIG. 4 is a single-line connection diagram. The same members as those in the conventional gas insulated switchgear shown in FIG.

(1) Configuration of Embodiment As shown in FIG. 1, the first and second lines 6 and 7 are each constituted by three single-phase in-line connecting buses 2A and 2B arranged in parallel. . Here, as shown in the front view of FIG. 2, the in-line connecting buses 2A and 2B are arranged at a height where the in-line connecting bus 2A coincides with the upper lead-out portion of the vertical circuit breaker. It is arranged at a height that coincides with the lower opening portion of the mold circuit breaker. The in-line connection buses 2A and 2B of the first line 6 and the in-line connection buses 2A and 2B of the second line 7 are arranged on the same axis.

  The inter-line connection main buses 3A and 3B connecting the first and second lines 6 and 7 are composed of three single-phase buses arranged in parallel. As shown in FIG. The connection main bus 3A is above the lead-out bus 4, the second inter-line connection main bus 3B is below the in-line connection bus 2B, parallel to the in-line connection buses 2A and 2B (first and second lines). 6 and 7 in parallel with the length direction). In the plan view of FIG. 1, only the in-line connection bus 2B is shown, and the inter-line connection main buses 3A and 3B are not shown.

  From the central portion in the length direction of the in-line connection buses 2A and 2B in the first and second lines 6 and 7, three lead lines 4 made of single-phase buses are perpendicular to the in-line connection buses 2A and 2B. Each is pulled out. Among these, from the in-line connection bus 2A arranged in the upper part of FIG. 2, a lead-out line 4 is connected horizontally to the lead portion provided on the upper part of the in-line connection bus 2A. Further, from the in-line connecting bus 2B arranged below, a vertical bus is arranged at the upper part, and the lead-out bus 4 is connected to the upper lead portion of this vertical bus. As a result, the two sets of lead-out buses 4 drawn from the in-line connection buses 2A and 2B are arranged in parallel at the same height.

  First to third vertical circuit breakers 1A to 1C and 1D to 1F are provided on the first and second lines 6 and 7, respectively. These vertical type circuit breakers 1A to 1C and 1D to 1F are all single-phase type circuit breakers as shown in the side view of FIG. The lower lead-out portion is provided at a position corresponding to the lower in-line connection bus 2B.

The connection configuration of each of the vertical circuit breakers 1A to 1C and 1D to 1F is as follows.
First, in the first line 6, the main bus switching disconnector 5 is provided so that the upper lead of the circuit breaker 1A and the upper lead of the circuit breaker 1B can be connected to and disconnected from the main bus to the in-line connecting bus 2A. through the connected and connected through a disconnector 5 for the main bus switching the lower yarn end finding 9 of the lower yarn end finding 9 breaker 1C for the line in connection bus 2 B breaker 1B, the connection of the bus in the line Do.

  The lower lead of the circuit breaker 1A of the first line 6 and the lower lead 9 of the breaker 1F of the second line 7 are connected to the inter-line connection main bus 3B via the main bus switching disconnector 5, and the circuit breaker 1C The upper lead 9 and the upper lead 9 of the circuit breaker 1D of the adjacent line 7 are connected to the inter-line connection main bus 3A via the main bus switching disconnector 5, and the buses 6 and 7 are connected.

  As described above, the lead-out line 4 is branched from the in-line connecting bus 2A sandwiched between the bus switching disconnectors 5, and the inter-line connecting bus 3A in-line connecting bus 2A in the opposite direction to the adjacent circuit breaker 1. Lead-out bus 4 is pulled out using the space between the two.

  Further, an air-insulating bushing 10 is disposed at the end of the lead-out bus 4 connected to the power transmission line. In this case, the axial line connecting the three-phase bushing axes in the phase arrangement of the air bushings (usually referred to as A phase, B phase, and C phase) is arranged so as to be parallel to the main axis of the main bus group. . The devices described in FIGS. 1 to 3 are electrically connected as shown in the single-line connection diagram of FIG.

(2) Operation of the embodiment As described above, in the present embodiment, the vertical circuit breakers 1A to 1C and 1D to 1F are vertically arranged with the in-line connection buses 2A and 2B and the inter-line connection main buses 3A and 3B interposed therebetween. By arranging it, the vertical circuit breakers 1A to 1C and 1D to 1F can be pulled out without disassembling other devices in the direction opposite to the busbar, and the work range for inspection / repair range is greatly reduced. By doing so, it becomes possible to reduce the working time and cost required for maintenance.

  Further, by arranging the adjacent lines 6 and 7 in series on the same axis of the inter-line connecting buses 3A and 3B, the depth (width) dimension of each GIS line is reduced, so that the installation depth width can be reduced. This will enable the site acquisition cost and GIS building construction cost to be reduced. At the same time, by reducing the depth (width) of each line, the lead-out line bus 4 can be shortened, and the cost can be reduced.

  In the conventional layout, in order to secure the space for the lead-out bus 4, a long inter-line connection main bus is required between the lines 6 and 7, but the lines 6 and 7 are arranged perpendicular to the direction of the lead-out bus 4. By branching from each of the vertical circuit breakers 1A to 1C and 1D to 1F, a space for arranging the lead-out bus 4 is not necessary, and it is not necessary to avoid the circuit breaker. As a result, it is possible to shorten the length of the lead-out bus and the connection main bus between lines, thereby reducing the cost. In addition, it is not necessary to change the angle of the lead-out bus 4, which contributes to a reduction in the number of lead-bar constituent units.

  In addition, in the present embodiment, the entire apparatus has a single-phase bus configuration, and the in-line connection buses 2A and 2B, the inter-line connection main buses 3A and 3B, and the lead-out buses 4 are arranged in four upper and lower stages. Main buses 3A and 3B are arranged in the lower and upper stages, and connection buses 2A and 2B are arranged in the middle. Moreover, the axes connecting the three phases of the connecting buses 2A and 2B are shifted from the axes of the horizontal connecting buses extending from the vertical circuit breakers 1A to 1C and 1D to 1F.

  By doing so, all the bus bars can be crossed, and the depth (width) dimension of the entire apparatus can be constituted by three single-phase bus lines + breaker width. On the other hand, in the invention of Patent Document 1, it is two three-phase buses + circuit breaker width, but the three-phase bus has a diameter of 1.5 to 2 times that of a single-phase bus, so substantially. The device of this embodiment is equivalent to or less than that of the device of Patent Document 1.

  Furthermore, in ultra-high voltage substations, one is often composed of the transmission line side and the other is a transformer group across the GIS line. Considering this point, an air insulation bushing 10 is disposed on the power transmission line side, and a lead-out bus 4 is disposed on the opposite side so that it can be connected to a transformer or the like. In this case, the circuit breaker is arranged on the opposite side of the drawer bus in consideration that the inspection performance of the circuit breaker is impaired because the drawer bus 4 passes through the upper part of the circuit breaker. Therefore, it is possible to realize a gas insulated switchgear that is highly expandable and compact.

It is a top view which shows one Embodiment of the gas insulated switchgear of this invention. It is a front view of the gas insulated switchgear of FIG. It is a side view of the vertical circuit breaker part of the gas insulated switchgear of FIG. FIG. 2 is a single line connection diagram of the gas insulated switchgear of FIG. 1. It is a top view which shows an example of the conventional gas insulated switchgear.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 1A ... 1st circuit breaker 1B ... 1st circuit 2nd circuit breaker 1C ... 1st circuit 3rd circuit breaker 1D ... 2nd circuit 1st circuit breaker 1E: Second circuit breaker 1F of second line 3rd circuit breaker 2A of second line ... Main bus 2B for in-line connection Main bus 3A for in-line connection Main line 3B for inter-line connection Main bus 3B ... Inter-line connection Main bus 4 ... Lead-out line bus 5 ... Main bus disconnector 6 ... First line 7 ... Second line 8 ... Lead-out line 9 ... Breaker outlet 10 ... Air insulation bushing

Claims (3)

First and second lines connected via an inter-line connecting main bus, and first, second, and third circuit breakers are provided in each of the first and second lines. The first and third circuit breakers are electrically connected in series via the in-line connecting bus, and one end of each of the first and third circuit breakers is connected to the inter-line connecting main bus, and the first breaker in the first in-line connecting bus 1-1 / 2 circuit breaker type gas insulated switchgear in which a lead-out line is led out between the second and third circuit breakers and between the second and third circuit breakers in the second in-line connection bus,
The first and second in-line connection buses, lead-out buses, circuit breakers and inter-line connection main buses are each composed of single-phase equipment,
And the first and second lines in the connection bus, the lead bus and each bus for three phases which definitive in bridging main bus is disposed in parallel on the same water plane,
For the first and second in-line connection buses and the inter-line connection main buses, the main axes of the buses of each phase are in the same direction and substantially overlap in a plane.
And,
The first and second in-line connection buses and the inter-line connection main buses are arranged so as to overlap vertically,
The lead-out bus is arranged in a direction crossing the main axis direction of the first and second in-line connecting buses and the inter-line connecting main bus, and above and below the first and second in-line connecting buses and the inter-line connecting main bus. Arrange them so that they overlap ,
In the first line, the upper lead of the first breaker and the upper lead of the second breaker are connected to the first in-line connection bus, the lower lead of the second breaker and the third breaker Connect the lower lead of to the second in-line connection bus,
The lower lead of the first circuit breaker of the first line and the lower lead of the third circuit breaker of the second line are connected to the main connection line between the lines, and the upper lead of the third breaker of the first line A gas insulated switchgear characterized in that the upper lead of the first circuit breaker of the second line is connected to the main connection line between lines .   The at least one of the first to third vertical circuit breakers is arranged at a position opposite to a direction in which a lead-out bus connected to the in-line connecting bus is led out and an in-line connecting bus is interposed therebetween. The gas insulated switchgear according to 1.   Air insulation bushings are connected to the leading ends of the lead buses for each phase, and the axis connecting the bushing axes of the air insulation bushings for the three phases is arranged so as to be parallel to the main axis of the main bus group. The gas insulated switchgear according to claim 1.

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