JP2016135004A - Gas-insulation switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulation switchgear capable of improving earthquake proof, workability in operation and installation.SOLUTION: Two main bus lines and bus line integrated disconnectors 10a and 10b are disposed being faced to each other at a same level. A T-shaped attach/detach device 11a including a converter 2a for bus line-side unit is connected between the bus line integrated disconnectors 10a and 10b. A horizontal single-phase breaker 1 which is connected to the bottom of the attach/detach device 11a is horizontally disposed in a perpendicular direction with respect to the main bus line. A branch-side disconnector grounding device 16 is disposed and horizontally extended in a straight line.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a gas insulated switchgear.

  In recent years, a gas insulated switchgear is often used as a switchgear for the purpose of reducing the installation area, improving safety, maintainability and inspection, and harmonizing the environment. Since all the charging parts of the gas-insulated switchgear are housed in a grounded metal container, various arrangements have been proposed depending on the combination of devices, and a significant reduction has been achieved.

In addition, since the gas-insulated switchgear uses SF ₆ gas having high insulation strength as an insulating medium, it is possible to greatly reduce equipment such as a circuit breaker, a disconnector, a ground switch, and three conductors are integrated. Many three-phase collectives housed in one tank are also used. However, in the 550 kV class, when a device such as a circuit breaker or a disconnector is made into a three-phase collective type, there is a concern that the tank for storing the device becomes larger and the merit of reduction is reduced.

  Therefore, in the conventional gas-insulated switchgear, only the main bus and the gas-insulated bus on the line side are made into a three-phase collective type, and devices such as a circuit breaker and a disconnecting switch are applied with a single-phase type. A conventional example of such a gas-insulated switchgear will be described with reference to FIGS. FIG. 4 is a general single line connection diagram, and FIGS. 5 and 6 are a side view and a plan view showing an arrangement configuration of the gas insulated switchgear shown in FIG.

  As shown in FIG. 4, on both sides of the single-phase circuit breaker 1, a bus-side instrument current transformer 2a and a line-side instrument current transformer 2b are arranged. The current transformer 2a on the bus side is connected to the first main bus A and the second main bus B which are three-phase collective via the single-phase disconnectors 3a and 3b and the work grounding device 4a. . On the other hand, the line-side instrument current transformer 2b is connected to the bushing 5 via the work grounding device 4b, the single-phase disconnector 3c, and the line-side ground switch 4c. An instrument transformer 6 and a lightning arrester 7 are connected between the line side ground switch 4 c and the bushing 5.

  As shown in FIGS. 5 and 6, the single-phase circuit breaker 1 is arranged in a vertical shape in which the axial direction is vertical in order to reduce the line direction. Of the current transformers 2a and 2b arranged in the single-phase circuit breaker 1, the current transformer 2a on the bus-bar side is arranged at the middle height of the single-phase circuit breaker 1, and in the right direction in FIG. It is pulled out horizontally. Single-phase disconnectors 3a and 3b and work grounding device 4a are connected to instrument current transformer 2a. These single-phase disconnectors 3a and 3b and working grounding device 4a are provided to simplify the internal structure. Are constructed as bus bar integrated disconnectors 10a, 10b integrated with the main bus bar.

  The bus bar integrated disconnectors 10a and 10b are arranged at a position as low as possible in order to simplify the support structure. An attachment / detachment device 11a made of a bellows is provided between the bus bar integrated disconnectors 10a and 10b. When assembling or disassembling the bus bar integrated disconnectors 10a and 10b, the detachable device 11a is attached to and detached from the bus bar integrated disconnectors 10a and 10b.

  On the other hand, the line-side instrument current transformer 2b is arranged near the upper part of the single-phase circuit breaker 1, and is drawn horizontally in the left direction in FIG. The instrumental current transformer 2b is connected to the line-side working grounding device 4b, the single-phase disconnector 3c, and the line-side grounding switch 4c. These devices are integrated (combined) into a linear shape. It is stored in the disconnector grounding device 12.

  The disconnector grounding device 12 is linearly disposed above the single-phase circuit breaker 1 via the line-side instrument current transformer 2b. The disconnector grounding device 12 is located at a height exceeding 3 m above the ground, for example, because it is necessary to secure an inspection space for the mechanical part of the circuit breaker 1. For this reason, the disconnector grounding device 12 is configured to use a heavy machine such as a crane from above during assembly and disassembly.

  A three-phase collective line-side gas-insulated bus 15 is disposed about 1 m above the ground in consideration of earthquake resistance, and is connected to the bushing 5. For this reason, the disconnector grounding device 12 located above 3 m above the ground is connected to the line-side gas-insulated bus 15 near the ground via the falling bus 22 and the branch bus 17 that branches from three phases to a single phase. .

  By the way, the disconnecting devices 3a and 3b and the work grounding device 4a constituting the bus bar integrated disconnecting devices 10a and 10b are provided with operating devices 13a, 13b and 14a, respectively. These operating devices 13a, 13b, and 14a are attached to the bus bar integrated disconnectors 10a and 10b, but the main bus bars A and B are arranged at the lower part, so that they are installed below the bus bar integrated disconnectors 10a and 10b. It cannot be performed, but is installed on the upper part of bus bar integrated disconnectors 10a and 10b. Therefore, the operating devices 13a, 13b, and 14a are attached to a height of about 3 m above the ground, for example.

  Further, the disconnecting device 3c, the working grounding device 4b, and the track side grounding switch 4c built in the disconnecting device grounding device 12 are also provided with operating devices 13c, 14b, and 14c corresponding to the respective devices. These operating devices 13c, 14b, and 14c are attached to the lower side of the disconnector grounding device 12 at a height of about 3 m above the ground in order to secure an inspection space for the circuit breaker 1a.

JP 2003-309909 A

  However, the following problems have been pointed out in the conventional gas insulated switchgear. That is, when the vertical arrangement is applied to the single-phase circuit breaker 1, it is possible to reduce the line direction, but on the other hand, the position of the center of gravity is high and it is difficult to ensure the seismic strength.

  Embodiments of the present invention have been made in view of the above circumstances, and an object thereof is to provide a gas insulated switchgear that can improve earthquake resistance.

In order to solve the above-described problems, an embodiment of the present invention is characterized by having the following components (a) to (j).
(A) The three-phase collective first main bus bar and the second main bus bar are arranged in parallel at the same height.
(B) A single-phase branch part is provided in each of the first main bus bar and the second main bus bar.
(C) A single-phase disconnector is connected to the single-phase branch.
(D) The single-phase disconnector connected to the first main bus side and the single-phase disconnector connected to the second main bus side are arranged facing each other at the same height.
(E) A bus-side instrument current transformer is connected between these single-phase disconnectors.
(F) A single-phase circuit breaker is disposed below the single-phase disconnector and horizontally in a direction perpendicular to the first main bus bar and the second main bus bar.
(G) The single-phase circuit breaker is formed with a lead portion in the vertical direction and the horizontal direction.
(H) The bus-side instrument current transformer is connected to the vertical outlet of the single-phase circuit breaker.
(I) A line-side instrument current transformer and a linear disconnector grounding device are connected to the horizontal outlet of the single-phase circuit breaker.
(J) These line-side instrument current transformers and disconnector grounding devices are pulled out horizontally on the opposite side of the first main bus line and the second main bus bar, and single-phase portions are arranged substantially in parallel for three phases. .

The side view of 1st Embodiment. The top view of 1st Embodiment. The side view of 2nd Embodiment. The single wire connection diagram of a gas insulated switchgear. The side view of the conventional gas insulated switchgear. The top view of the conventional gas insulated switchgear.

  Embodiments according to the present invention will be specifically described below with reference to the drawings. Note that portions that are the same as or correspond to those in the prior art will be described using the same reference numerals as in FIGS. Further, since the single line connection diagram of the embodiment according to the present invention is the same as that shown in FIG. 4, the drawing and the description thereof are omitted for the single line connection diagram.

(A) First embodiment (configuration)
Hereinafter, a first embodiment of the present invention will be specifically described with reference to FIGS. 1 and 2. In the first embodiment, as shown in FIGS. 1 and 2, the first main bus A and the second main bus B (hereinafter also simply referred to as main buses A and B), which are three-phase collective shapes, are parallel to each other. At the same height.

  As shown in FIG. 2, the first main bus A and the second main bus B are each provided with a single-phase branch in the horizontal direction so as to face each other, and the single-phase branch on the first main bus A side Is connected to a single-phase disconnector 3a, and a single-phase disconnector 3b is connected to a single-phase branch on the second main bus B side. These single-phase disconnectors 3a and 3b are arranged to face each other at the same height.

  A T-shaped attachment / detachment device 11a is arranged between the single-phase disconnectors 3a, 3b. Single-phase disconnectors 3a and 3b are connected to the left and right opening portions of the T-shaped attachment / detachment device 11a, respectively. The detachable device 11a incorporates a bus-side instrument current transformer 2a, and this bus-side instrument current transformer 2a is connected between the single-phase disconnectors 3a and 3b.

  A single-phase circuit breaker 1 is disposed below the single-phase disconnectors 3a and 3b. This single-phase circuit breaker 1 is not horizontally arranged in the vertical direction but is arranged horizontally, and is arranged horizontally in a direction perpendicular to the axial direction of main buses A and B. The single-phase circuit breaker 1 is formed with outlets in the vertical direction and the horizontal direction. Among these, the lower part of the attachment / detachment device 11a is vertically attached to the vertical outlet.

  That is, since the single-phase disconnectors 3a and 3b are connected to the single-phase circuit breaker 1 by starting up the T-shaped detachable device 11a, the single-phase disconnectors 3a and 3b and the single-phase circuit breaker 1 are A space is formed by the height of the T-shaped attachment / detachment device 11a. Therefore, using this space, operating devices 13a, 13b, and 14a for operating the single-phase disconnectors 3a and 3b and the work grounding device 4a are arranged. These operating devices 13a, 13b, and 14a are all arranged in a low position on the front, for example, near 2 m from the ground, and are configured to be operated by workers from the ground.

  In addition, an attachment / detachment device 11b made of a gas-insulated bus is attached to a horizontal outlet portion of the single-phase circuit breaker 1, and a line-side instrument current transformer 2b and a linear disconnector grounding device 16 are provided here. Connected sequentially. The disconnector grounding device 16 houses a work grounding device 4b, a trackside disconnector 3c, and a trackside grounding switch 4c as in the prior art, and operating devices 13c, 14b, and 14c for operating these devices. Is attached to the lower part of the disconnector grounding device 16. The operating devices 13c, 14b, and 14c are all arranged in a low position on the front, for example, near 1.5 m from the ground, and have an arrangement configuration that allows an operator to operate from the ground.

  Further, the line-side instrument current transformer 2b and the disconnector grounding device 16 are arranged in three phases in a single-phase portion substantially in parallel. The disconnector grounding device 16 is connected to a connection bus 17 that branches from a three-phase bus to a single-phase bus. The line-side instrument current transformer 2b and the disconnector grounding device 16 are pulled out in the horizontal direction to the opposite side of the main bus lines A and B by the connection bus line 17, and the line-side gas insulation of the three-phase package type Externally connected by a bushing 5 via a bus 15.

(Function and effect)
According to the first embodiment having the above configuration, the main busbars A and B and the busbar integrated disconnectors 10a and 10b are arranged at the same height so as to face each other, and the busbar-side instrument current transformer 2a is incorporated. The T-shaped attaching / detaching device 11a is connected between the bus bar integrated disconnectors 10a, 10b, and the horizontal single-phase circuit breaker 1 connected to the lower portion of the attaching / detaching device 11a is connected to the main buses A, B. It arrange | positions horizontally at a right angle direction, the disconnector grounding switch 16 by the side of a track | line is comprised by the linear form, and is pulled out horizontally. This has the following operations and effects.

(1) Reduction The main busbars A and B and the single-phase disconnectors 3a and 3b are arranged on the upper portion of the single-phase circuit breaker 1, and the linear disconnector grounding device 16 connected to the single-phase circuit breaker 1 The single-phase circuit breaker 1 can be drawn linearly in the horizontal direction, and the length of the bus to the bushing 5 can be shortened to reduce the size of the entire apparatus.

(2) Earthquake resistance By placing the single-phase circuit breaker 1 horizontally, the center of gravity is lowered and the earthquake resistance is improved. For this reason, the outstanding safety | security can be ensured.

(3) Installation workability Further, by adopting the horizontal single-phase circuit breaker 1, it is possible to transport the bus-integrated disconnectors 10a, 10b and the line-side disconnector 3c in a connected state. , Each need not be transported alone. As a result, the number of on-site assembly locations can be reduced, and the installation process can be shortened.

(4) Workability of operation Since the operation devices 13a, 13b, 13c, 14a, 14b, and 14c of each device are arranged at a height of 1.5 to 2 m from the ground, an operation platform is not required. . Therefore, the operator can operate the operation devices 13a, 13b, 13c, 14a, 14b, and 14c from the ground without using the platform. As a result, the work efficiency of the operation is improved.

(5) Economical Because there is no need for reinforcement members and operation platforms to compensate for the low earthquake resistance of the circuit breaker, the installation work process can be shortened and the operation efficiency can be improved. It can be greatly reduced.

(B) Second embodiment (configuration)
A second embodiment of the present invention will be specifically described with reference to FIG. FIG. 3 is a side view showing a second embodiment of the gas insulated switchgear according to the present invention. The same parts as those in the first embodiment will be described with the same reference numerals.

  In this embodiment, as shown in FIG. 3, the horizontal lead-out portion of the single-phase circuit breaker 1 is connected to the linear disconnector grounding device via the attaching / detaching device 11b incorporating the line-side instrument current transformer 2b. 18 is connected to one lead-out portion. The linear disconnector grounding device 18 accommodates the working grounding device 4 b, and the other outlet is connected to the single-phase bus 19. By this single-phase bus 19, the line-side instrument current transformer 2b and the disconnector grounding device 18 are pulled out in the horizontal direction to the opposite side of the main buses A and B, and are connected to the transformer via the transformer connection portion 20. 21 is connected.

(Function and effect)
In the second embodiment configured as described above, the disconnector grounding device 18 is configured in a single-phase linear shape and is drawn out horizontally, but when the transformer connection portion 20 of the 550 kV class is a single phase, It becomes possible to connect directly with the single-phase bus 19. Thereby, the bus length from the main buses A and B to the transformer 21 can be shortened, and the overall apparatus can be reduced.

(C) Other Embodiments The above-described embodiments are presented as examples in the present specification, and are not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

  For example, the height at which the operation devices 13a, 13b, 13c, 14a, 14b, and 14c are installed is not limited to 1.5 to 2 m shown in the first embodiment, and the operator can operate from the ground. Any height is acceptable and it may be 1.5 m or less. In addition, the type and number of components can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1 Single-phase circuit breaker 2a Bus-side instrument current transformer 2b Line-side instrument current transformer 3a, 3b Single-phase disconnector 3c Disconnector 4a, 4b Work earthing switch 4c Line-side earthing switch 5 Bushing 6 Instrument Transformer 7 Arrester 10a, 10b Busbar integrated disconnector 11a, 11b Detachable device 12 Disconnector grounding device 13a, 13b, 13c Operating device 14a, 14b, 14c Operating device 15 Gas insulated bus 16 Disconnector grounding device 17 Branch bus 18 Disconnection Grounding device 19 Single-phase bus 20 Transformer connection 21 Transformer A First main bus B Second main bus

Claims (5)

The first main bus and the second main bus of the three-phase collective form are arranged in parallel at the same height,
A single-phase branch is provided for each of the first main bus and the second main bus,
Connect a single-phase disconnector to the single-phase branch,
The single-phase disconnector connected to the first main bus side and the single-phase disconnector connected to the second main bus side are arranged facing each other at the same height,
Connect the current transformer for bus side instrument between these single-phase disconnectors,
A single-phase circuit breaker is disposed below the single-phase disconnector and horizontally in a direction perpendicular to the first main bus and the second main bus,
The single-phase circuit breaker is formed with a lead portion in the vertical direction and the horizontal direction,
Connecting the current transformer for the bus-side instrument to the vertical outlet of the single-phase circuit breaker;
A line-side instrument current transformer and a linear disconnector grounding device are connected to the horizontal outlet of the single-phase circuit breaker,
These line-side instrument current transformers and disconnecting device grounding devices are drawn horizontally on the opposite side to the first main bus bar and the second main bus bar, and single phase portions are arranged substantially in parallel for three phases. Gas insulated switchgear. A T-shaped attachment / detachment device is disposed between the single-phase disconnectors and above the single-phase circuit breaker,
2. The gas insulated switchgear according to claim 1, wherein the detachable device includes the bus-side instrument current transformer, and the single-phase disconnector is connected to both left and right ends. A working grounding device is connected to the single-phase disconnector, and a main bus-integrated disconnector integrated with the main bus is provided.
Attach the operating device for the single-phase disconnector and the work grounding device to the main bus-integrated disconnector,
The disconnector grounding device integrally stores a work grounding device, a single-phase disconnector, and a line-side ground switch, and includes an operation device for the work grounding device, the single-phase disconnector, and the line-side ground switch. attachment,
The gas insulated switchgear according to claim 1 or 2, wherein the operating device is arranged at a height of 2 m or less from the ground.   The line-side gas-insulated bus in the form of a three-phase package is connected horizontally from the disconnector grounding device through a single-phase to three-phase branch bus, according to any one of claims 1 to 3. The gas insulated switchgear described.   The gas insulated switchgear according to any one of claims 1 to 4, wherein the disconnector grounding device is connected to a transformer via a single-phase bus.

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