JP2001309511A - Gas insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce space during replacement work. SOLUTION: Second 'A' main buses 38a and second 'B' main ones 38b are arranged in the horizontal direction parallel to the direction intersecting first 'A' main buses 26a and first 'B' main ones 26b at right angles on the extended line of the buses 26a and the ones 27b. Electric power is made to be exchanged by wiring the first 'A' buses 26a to the second 'A' buses 38a, and the second 'B' buses 26b to the second 'B' buses 38b via air bushings 46a, 46b each arranged on the second 'A' buses 38a and the second 'B' ones 38b.

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 which is replaced from an air insulated switchgear.

[0002]

2. Description of the Related Art FIG.
8 is a single-line diagram during the replacement work from the conventional double-bar system air-insulated switchgear to the double-bar system gas-insulated switchgear, and FIG. 5 is a plan view showing the configuration of FIG. It is. 4 and 5, the existing air-insulated switchgear 1 composed of the air-insulated equipment is of a double-bus system including a first instep main bus 2a and a first in-line main bus 2b. Two sets of air-insulated bus-side disconnectors 3a, 3b, 4
a, 4b are connected between the first instep main buses 2a, 2b. Then, one set of the air-insulated bus-side disconnectors 3a,
A first air insulation draw-out unit 7 composed of 3b, an air circuit breaker 5a, and an air insulation disconnecting switch 6 is connected to a transmission line 9 via an air bushing 8 to exchange power. A second air-insulated extraction unit 10 including the other set of air-insulated bus-side disconnectors 4a and 4b and an air circuit breaker 5b.
Are connected to a transformer 12 via a cable head 11 to exchange power.

On the other hand, a newly installed gas insulated switchgear 13 constituted by gas insulated equipment is of a double bus system comprising a second instep main bus 14a and a second inversion main bus 14b.
Two sets of gas-insulated bus-side disconnectors 15a, 15b, 16a,
16b is connected between the second main buses 14a and 14b. Then, one of the gas-insulated bus-side disconnectors 15a,
A first gas insulation draw-out unit 19 composed of 15b, a gas circuit breaker 17a, and a gas insulation disconnector 18 exchanges power via a bushing 20. A second gas-insulated extraction unit 21 composed of the other set of gas-insulated bus-side disconnectors 16a and 16b and a gas circuit breaker 17b is a cable head 2
2 to exchange power. Next, the procedure of the replacement work will be described. First, the first extended instep main bus 23
The first and second extended main buses 2a and 2b are extended on the extended line by a and the first extended second main bus 23b. The gas-insulated buses 24a, 24b and the air bushings 25a, 25
b, the connection between the second instep main bus 14a, 14b and the first extended instep main bus 23a, 23b.

[0004]

Since the conventional gas-insulated switchgear is constructed as described above, the first extended first main bus 23a, 23b is installed and the first second main bus 2 is installed.
a, 2b are extended on an extension line, and the first extension insulated main bus bars 23a, 23b are connected to the newly installed gas insulated switchgear via the gas insulated bus bars 24a, 24b and the air bushings 25a, 25b. However, there is a problem that a vast space for installing is required. Furthermore, when the replacement work to the gas insulated switchgear is completed, the gas insulated busbars 24a and 24b and the air bushings 25a and 25b cannot be effectively used. The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas insulated switchgear capable of reducing the space during replacement work. Still another object of the present invention is to provide a gas insulated switchgear capable of effectively utilizing equipment installed during replacement work.

[0005]

A gas-insulated switchgear according to the present invention connects a double bus consisting of a first insulated main bus and a first main bus to a power transmission line. From the existing aerial insulated switchgear, which exchanges power with the aerial insulated drawer unit and the second aerial insulated drawer unit, from the second insulated main bus and the second insulated bus of gas insulation A first gas-insulated extraction unit connected to the bus bar and a second
In the gas insulated switchgear which is replaced so that power is transferred by the gas insulated extraction unit, the first insulated bus and the first insulated bus are extended from the first insulated bus and the first insulated bus. Aerial bushings in which a second main bus and a second main bus are arranged in a direction orthogonal to the main bus in parallel with the horizontal direction, and are respectively arranged on the second main bus and the second main bus. Through which power is transferred between the first main bus and the second main bus, and between the first main bus and the second main bus via It is. In addition, the first main bus and the second main bus, and the first second main bus and the second main bus are disconnected, and the second main bus and the second second main bus are separated. The first gas-insulated extraction unit and the transmission line are connected via an air bushing removed from the main bus.

[0006] A single bus composed of the first main bus of the air insulation is connected to a power transmission line, and an existing air supply / reception unit that exchanges power with the first air insulation drawer unit and the second air insulation drawer unit. A gas which is replaced from the air-insulated switchgear so that power is transferred between a first gas-insulated extraction unit and a second gas-insulated extraction unit connected to a single bus consisting of a gas-insulated second main bus. In the insulated switchgear, a second main bus is horizontally arranged on an extension of the first main bus in a direction orthogonal to the first main bus, and via an air bushing arranged on the second main bus. Thus, the first main bus and the second main bus are connected to exchange power. In addition, a first gas-insulated extraction unit that replaces the first air-insulated extraction unit is arranged on the first air-insulated extraction unit side of the air bushing, and a second gas-insulated extraction unit that replaces the second air-insulated extraction unit. The second gas insulated extraction unit is disposed on the side of the second air insulated extraction unit of the air bushing. Further, in the single bus system, the first main bus and the second main bus are separated from each other,
The first via the air bushing removed from the second main bus
And the transmission line is connected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a single-line diagram during replacement work from the double-bus type air-insulated switchgear of the first embodiment to the double-bus type gas-insulated switchgear. In FIG. 1, reference numerals 26a and 26b denote a first instep main bus and a first inversion main bus 27a, 27b, and 28, respectively, of a double bus system constituted by air-insulated equipment.
a and 28b are first Koto main buses 26a and 26b, respectively.
Two sets of air-insulated bus-side disconnectors connected in series between them. 29a is an air-insulated circuit breaker connected between the air-insulated bus-side disconnectors 27a and 27b, and 29b is an air-insulated circuit breaker connected between the air-insulated bus-side disconnectors 28a and 28b. Reference numeral 30 denotes an air-insulated draw-out disconnector, and an air-insulated circuit breaker 29
a is connected in series. The first air-insulated draw-out unit 3 includes the air-insulated circuit breaker 29a and the air-insulated draw-out disconnector 30.
1 and a second air insulation draw-out unit 32 is constituted by the air insulation circuit breaker 29b.

Reference numeral 33 denotes an aerial bushing, which is arranged between the first aerial insulation draw-out unit 31 and a transmission line 34. Reference numeral 35 denotes a cable head, which is disposed between the second air-insulated extraction unit 32 and the transformer 36. Numeral 37 denotes an air-insulated switchgear, 26a, 26b, 27a, 27
b, 28a, 28b, 31-33, 35. Reference numerals 38a and 38b denote a second bus main bus and a second main bus of a double bus system constituted by gas-insulated equipment, and the first main bus 26a and the second main bus 26a and 46b to be described later. They are connected to the first main bus 26b, respectively. 39a, 39b, 40a and 40b are gas-insulated bus-side disconnectors connected in series between the second instep main buses 38a and 38b, respectively. 41a is a gas circuit breaker connected between the gas-insulated bus-side disconnectors 39a and 39b, 41b is a gas circuit breaker connected between the gas-insulated bus-side disconnectors 40a and 40b, and 42 is a gas-insulated pull-out disconnector. Circuit breaker 4
1a.

The gas-insulated bus-side disconnectors 39a and 39b, the gas circuit breaker 41a, and the gas-insulated lead-out disconnector 42 constitute a first gas-insulated lead-out unit 43, and the gas-insulated bus-side disconnectors 40a and 40b and the gas cutoff. The vessel 41b constitutes a second gas-insulated extraction unit 44. A cable head 45 is connected to the second gas-insulated extraction unit 44. Reference numerals 46a and 46b denote aerial bushings, which include a first Koto main bus 26a, 26b and a second Kooto main bus 38a, 38b.
And is located between. 47 is a gas insulated switchgear,
38a, 38b, 39a, 39b, 40a, 40b, 4
3 to 45, 46a and 46b. In order to simplify the description of the configuration of the air insulation switchgear 37, the first air insulation extraction unit 31 on the transmission line 34 side and the second air insulation extraction unit 32 on the transformer side are each one unit. However, it is general that a plurality of units each of the air insulation draw-out units 31 and 32 are installed. Therefore, the gas insulated switchgear 47 side is similarly replaced with a plurality of units.

Next, the procedure of the replacement work will be described. FIG. 2 is a plan view showing a configuration during replacement work from the double-bus type air-insulated switchgear of the first embodiment to the double-bus type gas-insulated switchgear. In FIGS. 1 and 2, second second main buses 38a, 38b are arranged in a direction perpendicular to the first second main buses 26a, 26b on an extension of the first second main buses 26a, 26b in parallel with the horizontal direction. I do. In this case, the first gas insulated extraction unit 43 is arranged on the first air insulated extraction unit 31 side of the air bushings 46a and 46b. The second gas insulated extraction unit 44 is disposed on the second air insulated extraction unit 32 side of the air bushings 46a and 46b. Then, via the aerial bushings 46a, 46b arranged on the second Koto main buses 38a, 38b, the first Koto main buses 26a, 26b on the existing side and the second Kooto main buses 38a, 38b on the new side. Are connected by lead wires 48a and 48b. At this time, electric power is transmitted and received between the transmission line 34 and the transformer 36 via the existing air-insulated switchgear 37.

Next, the second air-insulated extraction unit 32 is replaced with the second gas-insulated extraction unit 44. Then, the transformer 36 is connected to the second gas-insulated extraction unit 44. Subsequently, the plurality of second air-insulated extraction units (not shown) are replaced with second gas-insulated extraction units (not shown). Here, the power is cut off and the lead wire 48
a, 48b are removed, and the second Koto main bus 38
The aerial bushings 46a, 46b are removed from above the a, 38b. Then, the above-removed air bushing 46a is arranged on the gas-insulated bus 49 laid to the vicinity of the power transmission line 34 as shown in FIG. 3 to connect the power transmission line 34 and the first gas-insulated extraction unit 43. I do. Further, the plurality of first air-insulated extraction units (not shown) are replaced with second gas-insulated extraction units (not shown). Then, the aerial bushing 4 removed above between the first gas insulated extraction unit (not shown) and another power transmission line (not shown).
6b. In this manner, the replacement work from the air-insulated switchgear 37 to the gas-insulated switchgear 47 is completed.

As described above, the first Koto main bus 26 is placed on an extension of the first insulated first Koto main bus 26a, 26b.
The second insulated main busbars 38a, 38b of gas insulation are arranged in parallel in the direction perpendicular to the a, 26b, and the air bushings 46a, 46b arranged on the second instep main buses 38a, 38b, respectively. Via each instep main bus 26a, 38
By connecting between "a" and the respective main buses 26b and 38b, it is possible to reduce the space required for the replacement work. Also, during the replacement work, the aerial bushings 46a, 46b used to connect the existing Koto main buses 26a, 26b to the new Koto main buses 38a, 38b are removed, and the transmission line 34 and the By diverting the connection to the first gas-insulated extraction unit 43, the equipment installed for the replacement work can be effectively used. Further, the newly installed first gas insulated extraction unit 43 is replaced with the existing first air insulated extraction unit 31.
By arranging the second gas-insulated extraction unit 44 on the side of the existing air-insulated extraction unit 32, the connection with the transmission line 34 and the transformer 36 can be easily performed.

In the first embodiment described above, the double bus type air insulated switchgear 37 is replaced with the double bus type gas insulated switchgear 47. The same applies to the single bus type replacement. The effect can be expected. Further, in the first embodiment, the first
The gas insulated extraction unit 43 of the air bushing 46a,
46b is disposed on the side of the first air-insulated extraction unit 31;
The second gas-insulated extraction unit 44 is connected to the air bushing 46.
A description has been given of the arrangement of the gas insulation extraction units 43 and 44 on the side opposite to the air bushings 46a and 46b. You can expect.

[0014]

According to the present invention, the second insulated main bus in the direction orthogonal to the first insulated main bus on the extension of the insulated first insulated main bus in the double bus system. Are arranged in parallel in the horizontal direction, and the existing Kooto main bus and the new Kooto main bus are connected via the air bushings respectively arranged on the second Kooto main bus, thereby replacing the main bus. Space required for construction can be reduced. Also, during the double bus system replacement work, the aerial bushing used to connect the existing Koto main bus and the new Koto main bus was removed, and the transmission line and the first gas-insulated extraction unit were removed. The equipment installed for the replacement work can be used effectively by diverting to the connection of. In addition, a second main bus of gas insulation is arranged in a direction orthogonal to the first main bus in parallel with the horizontal direction on an extension of the first main bus of air insulation in the single bus system, By connecting the existing main bus and the new main bus via the air bushings respectively arranged on the bus, the space required for the replacement work can be reduced.

Further, the first gas-insulated extraction unit is connected to the first
By arranging the second gas-insulated extraction unit on the side of the second air-insulated extraction unit and the second gas-insulated extraction unit, it is possible to easily connect to the equipment to be diverted. In addition, the air bushing used to connect the existing main bus and the new main bus during the single-bus system replacement work was removed, and the transmission line was connected to the first gas-insulated extraction unit. By diverting, the equipment installed for replacement work can be used effectively.

[Brief description of the drawings]

FIG. 1 is a single-line diagram during replacement work from a double-bus air-insulated switchgear to a double-bus gas-insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a plan view showing the configuration of FIG.

FIG. 3 is a plan view showing the completion of replacement work for the double-bus gas-insulated switchgear in the first embodiment.

FIG. 4 is a single-line diagram during a replacement work from a conventional double-bus type air-insulated switchgear to a double-bus type gas-insulated switchgear.

FIG. 5 is a plan view showing the configuration of FIG.

[Explanation of symbols]

26a 1st main bus, 26b 1st main bus, 3
1 first air insulated drawer unit, 32 second air insulated drawer unit, 34 transmission line, 37 air insulated switchgear, 38a second instep main bus, 38b second second main bus,
43 first gas insulated extraction unit, 44 second gas insulated extraction unit, 46a, 46b air bushing,
47 Gas insulated switchgear.

Claims (5)

[Claims] 1. A double bus consisting of a first insulated main bus and a first second main bus connected to an electric power transmission line, a first air insulated drawer unit and a second air insulated drawer. A first gas-insulated extraction unit connected to a double bus consisting of a second insulated main bus and a second main bus of gas insulation from an existing air-insulated switchgear that exchanges power with the unit; 2
The gas insulated switchgear which is replaced so that power is transferred by the gas insulated extraction unit of the first aspect,
The second main bus and the second second main bus in a direction orthogonal to the first main bus and the first second main bus on an extension of the first main bus and the first second main bus. The buses are arranged in parallel in the horizontal direction, and the first main bus and the second main bus are arranged via the air bushings respectively arranged on the second main bus and the second main bus. A gas insulated switchgear, wherein power is transferred between the first bus and the second bus, and between the first bus and the second bus. 2. Disconnecting between the first main bus and the second main bus, and between the first second main bus and the second second main bus, the second main bus and The gas insulated switchgear according to claim 1, wherein the first gas insulated extraction unit and the transmission line are connected via an air bushing removed from the second main bus. 3. An existing bus in which a single bus consisting of an air-insulated first main bus is connected to a transmission line, and power is exchanged between a first air-insulated extraction unit and a second air-insulated extraction unit. A gas which is replaced from the air-insulated switchgear so that power is transferred between a first gas-insulated extraction unit and a second gas-insulated extraction unit connected to a single bus consisting of a gas-insulated second main bus. In the insulated switchgear, the second main bus is horizontally arranged on an extension of the first main bus in a direction orthogonal to the first main bus, and is arranged on the second main bus. A gas insulated switchgear, wherein power is transferred between the first main bus and the second main bus via a middle bushing. 4. A second air-insulated extraction unit, wherein a first gas-insulated extraction unit for replacing the first air-insulated extraction unit is disposed on the air-bushing in the first air-insulated extraction unit. The gas according to any one of claims 1 to 3, wherein a second gas insulated extraction unit that replaces the gas is disposed on the side of the air bushing on the side of the second air insulated extraction unit. Insulated switchgear. 5. A first gas-insulated extraction unit and a transmission line via an aerial bushing separated from the first main busbar and the second main busbar and removed from the second main busbar. The gas insulated switchgear according to claim 3, wherein