JPH04308405A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE:To reduce the size of a gas-insulated switchgear by arranging the main bus of each one phase of two main bus groups respectively composed of main buses of three phases in the same plane and the main buses of each two phases adjacent to the side faces of the main buses of each one phase in an upper and lower stages. CONSTITUTION:The main buses 1c and 2a of each one phase of the first and second main bus groups 1 and 2 respectively composed of main buses of three phases are arranged adjacent to and in parallel with each other in the same plane. The main buses 1a and 1b and 2b and 2c of the other two phases of the groups 1 and 2 are respectively arranged in an upper and lower stages, with the buses 1a and 1b of the group 1 being arranged adjacent to the side face of the bus 1c and buses 2b and 2c of the group 2 adjacent to the side face of the bus 2a. The first and second bus change-over disconnecting switches 5 and 6 are respectively provided above the buses 1c and 2a. Therefore, the spaces occupied by the main buses and, accordingly, the size of this gas-insulated switchgear can be reduced.

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 installed in a substation or the like.

0002

2. Description of the Related Art FIG. 2 is a single-line diagram of a branch line that is constructed of two groups of main bus bars in a substation or the like and branches from the main bus bar. FIG. 3 is a side view of a conventional device in which the configuration of the single line diagram shown in FIG. 2 is configured with a gas insulated switchgear. In FIGS. 2 and 3, 1 is a first main bus group consisting of phase-separated main bus bars 1a, 1b, and 1c composed of three phases;
are phase-separated main busbars 2a, 2b, 2c with the same configuration as 1.
This is the second main bus group with . 3a, 3b, 3c
4a, 4b, 4c are first connection buses connecting each main bus bar 1a, 1b, 1c of the first main bus group 1 and a first bus switching disconnector 5 to be described later, and 4a, 4b, 4c are second main bus bars. This is a second connection bus that connects each of the main buses 2a, 2b, 2c of group 2 and a second bus switching/disconnecting switch 6, which will be described later. a attached to 1 to 4
, b, and c represent the a phase, b phase, and c phase among the three phases of each part. 5 is a first bus switch/disconnector that connects and disconnects the first main bus group 1 and the branch line; 6 is a second bus switch/disconnect switch that connects and disconnects the second main bus group 2 and the branch line. It is a vessel. 7 is a third connecting bus that connects the first bus switching and disconnecting switch 5 and the second bus switching and disconnecting switch 6, and 8 is a grounding device for grounding the third connecting bus 7 during inspection. be. Reference numeral 9 indicates a current transformer on the busbar side that detects the line current necessary for system control, numeral 10 indicates a circuit breaker that opens and closes the line, and numeral 11 indicates a current transformer on the line side that detects the line current necessary for system control. 12
1 is a line disconnector that opens and closes the line, 13 and 14 are grounding devices that are grounded during inspection, 13 is a circuit breaker side grounding device, and 14 is a line side grounding device. 15 is a cable connection part to which a line is connected; 16 is a line disconnector 12 and a cable connection part 15;
This is the fourth connection bus that connects the.

[0003] A conventional gas insulated switchgear comprising two groups of main busbars is constructed as described above, and the main busbars 1a, 1b, 1c of the first main busbar group 1 and the second main busbar group The main bus lines 2a, 2b, 2c of 2 are arranged horizontally on the foundation surface,
The first bus switching disconnector 5 is the central phase 1b of the first main bus group.
The second bus switching disconnector 6 is installed above the central phase 2b of the second main bus group, and the first and second bus switching disconnectors 5 and 6 are connected to the third connecting bus 7. A circuit breaker 10 is connected via a current transformer 9 in a direction orthogonal to the main bus groups 1 and 2.
It is connected to the. A grounding/disconnecting switch 8 that connects the second bus switching/disconnecting switch 6 to the circuit breaker 10 during inspection is attached to the right side of the second bus switching/disconnecting switch 6 as shown in the figure. A current transformer 11, a line disconnector 12, and a fourth connecting bus 16 are connected sequentially from the top of the circuit breaker 10, and the tops of the bus switching and disconnecting switches 5 and 6 are installed in a direction orthogonal to the main bus group,
It is connected to the cable connection section 15. As for the grounding devices 13 and 14 required during inspection, 13 is attached to the circuit breaker 10 side of the line disconnector 12, and 14 is attached to the line side.

0004

The conventional gas insulated switchgear constructed as described above has three main busbars 1a, 1b, 1c for each phase of the first main busbar group and each phase of the second main busbar group. Since the main busbars 2a, 2b, and 2c are horizontally arranged on the foundation surface, a large installation area is required. Furthermore, the distance between the first and second busbar switching/disconnecting switches 5 and 6 is wide, and the third connection busbar 7 is required, and the distance between the circuit breaker 10 and the cable connection section 15 is also long, and a fourth The connection bus bar 16 was also longer.

[0005] This invention was made to solve the above-mentioned problems, and aims to reduce the layout area of the main bus group, and also reduces the spacing between the circuit breakers and cable connections that make up the branch line, thereby achieving gas insulation. The purpose is to reduce the size of the switchgear.

[0006]

[Means for Solving the Problems] A gas insulated switchgear according to the present invention has two main busbar groups each having three phase-separated phases. The main busbars are arranged in parallel on the same plane, and the main busbars of each of the other two phases of each group main busbar are arranged in upper and lower two stages, and are arranged adjacent to each side of the main busbar of each of the above-mentioned one phase. . The busbar switching and disconnecting switches 5 and 6 are arranged above the main busbars of each phase of each group main busbars arranged adjacently and in parallel so as not to affect the installation area of the main busbar portion.

[0007]

[Function] By arranging each phase of the main busbars of each group as described above, the installation area of the main busbar group is reduced, the interval between the two busbar switching disconnectors is narrowed, and the distance between the circuit breaker and the cable connection section is reduced. The distance is also shortened, and the gas insulated switchgear can be made smaller.

[0008]

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing one embodiment of the present invention. 1 and 1a, 1b, 1c,
2, 2a, 2b, 2c, 5, 6, 8 to 15 are the same or have the same functions as those shown in FIG. 3, which shows a conventional device, and their explanation will be omitted. 17a, 17b, 17c are first connection buses that connect each phase main bus 1a, 1b, 1c of the first main bus group 1 and the first bus switching disconnector 5 for each phase;
18b and 18c are each phase main bus bar 2a of the second main bus group 2
, 2b, 2c and the second bus switching disconnector 6 for each phase. Reference numeral 19 denotes a fourth connection bus bar that connects the line disconnector 12 and the cable connection section 15.

[0009] In the gas insulated switchgear having the above configuration,
The main busbars 1c and 2a of each one phase among the main busbars of each of the three phases constituting the first main busbar group 1 and the second main busbar group 2 are arranged adjacently and parallel to each other on the same plane. The main busbars 1a, 1b and 2b, 2c of each of the other two phases of busbar groups 1 and 2 are arranged in upper and lower stages, respectively, and the main busbars 1c, 2a of each of the above-mentioned parallel phases are arranged in parallel.
Adjacent to the side surface of c, the main busbars 1a, 1 of the first main busbar group
The two phases of main busbars 2b and 2c of the second main busbar group are arranged adjacent to the side surface of 2a, and the two phases of main busbars 2b and 2c of the second main busbar group are arranged adjacent to the side surface of Of the busbars 1c and 2a, a first busbar switching disconnector 5 is installed above the main busbar 1c, and a first busbar switching disconnector 5 is installed above the main busbar 1c
A second busbar switching disconnector 6 is disposed above each of the busbars. Each phase main bus bar 1a, 1b of the first main bus group 1
, 1c and the first bus switching/disconnecting switch 5 by the first connection buses 17a, 17b, 17c, and connecting each phase main bus 2a, 2b, 2c of the second main bus group 2 to the second bus switching/disconnecting switch. The devices 6 are connected by second connection buses 18a, 18b, and 18c, respectively.

By arranging the first main bus group 1 and the second main bus group 2 in this way, the first bus switching disconnector 5 and the second bus switching disconnector 6 can be placed close to each other. This makes it possible to connect the two without using a third connection bus. Furthermore, the distance between the circuit breaker 10 and the cable connection portion 15 is shortened, and the fourth connection bus 19 can be shortened.

Example 2. Even in the case where the cable connection part 15 is changed to a structure that can be connected to an aerial bushing, an aerial bushing is attached, and the cable connection part 15 is connected to an overhead power line.
It goes without saying that it is still a gas insulated switchgear and can be constructed in the same way.

0012

As described above, according to the present invention, the main busbars of two of the three phases in each group of the first main busbar group and the second main busbar group are arranged in upper and lower stages, respectively. The configuration is such that the first main bus group and the second main bus group are placed close to each other, so the installation area of the main bus bar portion is small, and bus bar switching is possible. By arranging the disconnectors above the adjacent phases of the first main bus group and the second main bus group, the two busbar switching disconnectors can be directly connected in close proximity, and can also be disconnected. The distance between the device and the cable connection is also shortened, and the gas insulated switchgear can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of a gas-insulated switchgear according to the present invention.

FIG. 2 is a single-line diagram showing a substation branch line section composed of two groups of busbars.

FIG. 3 is a side view of a case where the single line diagram shown in FIG. 2 is configured using a conventional gas insulated switchgear.

[Explanation of symbols]

1 First main bus group 1a First main bus a phase 1b First main bus b phase 1c First main bus c phase 2 Second main bus group 2a Second main bus a phase 2b Second main bus b phase 2c Second main bus c phase 3a First connection bus a phase 3b First connection bus b phase 3c First connection bus c phase 4a Second connection bus a phase 4b Second connection bus b phase 4c Second connection bus c phase 5 First bus switch disconnector 6 Second busbar switching disconnector 7 Third connection busbar 8 Grounding device 9 Current transformer 10　Breaker 11 Current transformer 12 Line disconnector 13 Grounding device 14 Grounding device 15 Cable connection part 16 Fourth connection busbar 17a First connection bus a phase 17b First connection bus b phase 17c First connection bus c phase 18a Second connection bus a phase 18b Second connection bus b phase 18c Second connection bus c phase 19 Fourth connection busbar

Claims (1)

[Claims] Claim 1: Connection and disconnection of a first main bus group and a second main bus group each having three phase-separated phases, and a branch line branching from the main bus group, and the main bus group. In a gas-insulated switchgear equipped with a branch line device consisting of a bus switching disconnect switch, a circuit breaker, a line disconnect switch, etc., one of the three phases of each group of the first main bus group and the second main bus group The main busbars of each one phase are arranged in parallel adjacent to the same plane, and the main busbars of each of the other two phases of the first main busbar group and the second main busbar group are arranged in upper and lower two stages, respectively, and The first main bus group and the second main bus group are arranged adjacent to each side of the main bus bar of each one phase arranged in parallel, and the first main bus group and the second main bus group are adjacent to each other. A gas insulated switchgear characterized in that a busbar switching disconnector is disposed above each one of the phases.