JP2000041308A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure working space, when performing a maintenance work of constituent devices. SOLUTION: Bus tanks 4a, 4b, which store a bus 7 (or a bus 8) and a disconnector 9 are provided on top of a device tank 3 storing a breaker 26, grounding switches 27, 28, a disconnector 29, and a grounding switch 30. Operating parts 36, 37, 21, 33 which operate the breaker 26, grounding switches 27, 28, 30 and disconnectors 9, 29 are arranged on the front.

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 secures a work space for maintenance.

[0002]

2. Description of the Related Art In general, a conventional gas insulated switchgear is generally constructed by accommodating all components in a single container and filling the inside of the container with an insulating gas.

[0003] However, with the development of various technologies in recent years, the size of each component device has been reduced, so that a multifunction device configured by combining these component devices has also been reduced in size.

[0004] For example, as disclosed in Japanese Patent Application Laid-Open No. 8-214423, a gas insulated switchgear provided with a disconnecting device that eliminates the need for gas processing work at the time of testing, and in Japanese Patent Application Laid-Open No. 8-214425. There is a disconnector with a grounding switch that can be miniaturized as described above, and a disconnector whose external shape is miniaturized as disclosed in JP-A-9-50744.

[0005] A gas circuit breaker is generally used for a device having a voltage of 72/84 kV used in a transmission line in an electric power system.

[0006]

However, although the components and the gas-insulated switchgear have been miniaturized, a work space for maintenance of each component cannot be secured.
It is necessary to arrange each component in consideration of maintenance.

When a gas circuit breaker is used, a part of the insulating gas (SF ₆ gas) filled in the tank is decomposed by the arc at the time of interruption, and harmful substances harmful to the environment and the human body are removed. May be generated. Therefore, the insulating gas extracted from the tank when inspecting the gas insulated switchgear needs to be collected and properly treated.

Accordingly, an object of the present invention is to provide a gas insulated switchgear which solves the above problem.

[0009]

According to a first aspect of the present invention, there is provided a gas insulated switchgear having an equipment tank filled with an insulating gas and disposed on a ceiling side of the equipment tank. A pair of bus tanks containing a bus and filled with an insulating gas, and a cable storage portion provided in the atmosphere below the bus tank and on the rear side of the equipment tank. The cable head is housed in the housing part and the cable head is provided in a manner to airtightly penetrate the back of the equipment tank.In the equipment tank, a circuit breaker and a plurality of switches are provided between the bus and the cable head. 3. A gas insulated switchgear according to claim 2, wherein said switchgear is electrically connected, and an operation unit for operating the circuit breaker and the switch is arranged and provided in the atmosphere in front of the equipment tank. The configuration is such that a switchgear comprising the circuit breaker and a pair of switches arranged on the bus side and the cable head side of the circuit breaker is detachably attached to a main circuit conductor fixed to the bus side and the cable head side. The gas-insulated switchgear according to claim 3, wherein the circuit breaker is a vacuum circuit breaker having a vacuum interrupter provided on the inner surface side of the mounting plate, and the circuit breaker is provided on the outer surface side of the mounting plate. 5. The gas insulated switchgear according to claim 4, wherein an operation unit operatively connected to the vacuum interrupter is attached and provided, and the attachment plate is airtightly and detachably attached to an opening on the front surface of the equipment tank. Is characterized in that at least one of the pair of switches is a ground switch,
In the configuration of the gas insulated switchgear according to claim 5, each bus is connected to a penetrating main circuit conductor that hermetically passes through the bus and the equipment tank via a switch in each bus tank. 7. A gas insulated switchgear according to claim 6, wherein a penetrating main circuit conductor is detachably connected to a connection main circuit conductor which is electrically connected to and fixed to a device. The gas insulated switchgear according to claim 7 is characterized in that a T-shaped cable head is used as the cable head. The configuration of the gas insulated switchgear is characterized in that a DC test terminal is provided on the T-shaped cable head.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas insulated switchgear is generally a power receiving unit, a primary transformer unit for connection to a transformer, and a PCT containing a transformer for current transformer (PCT).
It consists of a unit.

Next, an embodiment of the gas insulated switchgear according to the present invention will be described. This embodiment shows a power receiving unit, and FIG. 2 shows a single-line diagram of the power receiving unit. In FIG. 2, 7 is the Instep Bus, 8 is the Otome Bus, 9, 29
Is a disconnector, 27, 28, and 30 are grounding switches, 26 is a circuit breaker, 31 is an arrester, 48 is a cable head, and 49 is a switchgear. In the figure, a V-shaped symbol is overlapped with a portion where the main circuit conductor is detachably connected to the main circuit conductor.

First, the configuration of the power receiving unit is shown in FIG.
As shown in the figure, a housing 2 having doors 1a and 1b on the front left side in the figure and an opening on the back is provided.
Inside the equipment tank 3 and a pair of busbar tanks 4a, 4b
And are housed.

In the bus tanks 4a and 4b, three-phase instep buses 7 and second buses 8 are hermetically sealed in the bus tanks 4a and 4b in a direction perpendicular to the paper surface via three-phase insulating spacers 5 and 6. Penetrates. The instep bus 7 and the second bus 8 are guided into the equipment tank 3 via a disconnector 9 as a switch, a main circuit conductor 10, and a penetrating main circuit conductor 11. That is, it is as follows. Fixed contacts 9a are respectively mounted inside mounting plates 12 which constitute a part of the bus tanks 4a and 4b, and the fixed contacts 9a are connected to the fixed buses 7 and 2 via main circuit conductors 10 which are detachable from the fixed contacts 9a. Bus 8
Connected to each other. On the other hand, a portion separating the inside of the equipment tank 3 from the inside of the pair of busbar tanks 4a, 4b is provided via a three-phase insulating spacer 14 that closes the communication holes 4c, 4d penetrating the busbar tanks 4a, 4b and the equipment tank 3. The penetrating main circuit conductor 11 is airtightly penetrated, and the penetrating main circuit conductor 1
A fixed contact 9b is attached to the upper end of 1. The connection main circuit conductor 11 is provided on the upper part of the inside of the equipment tank 3.
a is fixedly provided, and lower ends of a pair of penetrating main circuit conductors 11 are detachably connected to two places of the connection main circuit conductor 11a.

The fixed contact 9b is attached as shown in FIG. That is, the fixed contact 9b is composed of a fixed electrode 15, a plurality of contacts 17 bound by a coil spring 16, and a shield 18, and a bolt 20 inserted through a hole 19 formed in the main circuit conductor 11 is fixed to the fixed electrode 9b. 15 screwed. The inner diameter of the hole 19 is formed larger than the outer diameter of the bolt 20, so that the centering of the fixed contact 9b can be adjusted.

The fixed contact 9a includes a movable contact 9
c are slidably inserted through these and fixed contacts 9b.
Constitutes the disconnector 9. An operation unit 21 for operating the disconnector 9 is attached to the outside of each of the mounting plates 12, and the operation unit 21 is linked to the movable contact 9c via an insulating rod (not shown) that penetrates the mounting plate 12 in an airtight manner. ing. The operation unit 21 on the right side of the bus bar tank 4b in FIG. 1 is not shown.

Inside the equipment tank 3, the main circuit conductors 22,
23 is attached via insulators 24 and 25. Further, inside the equipment tank 3, a circuit breaker 26, ground switches 27, 28, 30 and a disconnector 29 constituting a switch are provided.
And the lightning arrester 31 are accommodated. In the present invention, a vacuum interrupter that does not generate decomposition gas is used as the circuit breaker 26. These devices are detachably attached to the device tank 3 as follows.

A disconnecting switch 29 and a grounding switch 30 are mounted inside the mounting plate 32, and an operation section 33 for operating both is mounted on the outside. The disconnector 29 and the earthing switch 30 are, similarly to the disconnector 9, provided with fixed contacts 29a, 30a and fixed contacts 29b, 30b.
And the movable contacts 29c, 30c. The fixed contacts 29a, 30a are attached to the mounting plate 32, while the fixed contacts 29b, 30b are shown in FIG.
And is attached to the main circuit conductor 23. The lower end of the main circuit conductor 34 is connected to the fixed contact 29a. These disconnector 29, ground switch 3
The operation unit 33 is detachably mounted by connecting the mounting plate 32 to the equipment tank 3 via bolts.

The mounting plate 35 above the mounting plate 32 is formed of an insulating member. Inside the mounting plate 35, circuit breakers 26 and grounding switches 27 and 28 for grounding the main circuit conductors on the busbar side and the cable head side of the circuit breakers 26 are provided.
Are attached to constitute the switching device 49,
An operation unit 36 for operating the circuit breaker 26 and an operation unit 37 for operating the grounding switches 27 and 28 are attached to the outside. The circuit breaker 26 is connected to the connection main circuit conductor 11a and the main circuit conductor 34 via contact connection portions 38 and 39. The contact connecting portions 38 and 39 have substantially the same configuration as that of FIG. 3 as shown in FIG. In the figure, 40 and 41 are connection conductors provided on the circuit breaker 26. The circuit breaker 26, the earthing switches 27 and 28, and the operation units 36 and 37
The attachment plate 35 is detachably attached to the equipment tank 3 via bolts.

The lightning arrester 31 is mounted on a mounting plate 42 below the mounting plate 32. The lightning arrester 31 is connected to the main circuit conductor 23 via the contact connection part 43. The lightning arrester 3 is connected to the contact connecting portion 43 as shown in FIG.
One connection conductor 44 is connected. This lightning arrester 31
Is detachably attached by attaching the attachment plate 42 to the equipment tank 3 via bolts.

Behind the equipment tank 3 is a cable storage 46
The cable head 48 is attached to the end of the cable 47 stored in the cable storage section 46. The cable head 48 is connected to the main circuit conductor 22.
Is connected to the upper end through a contact connecting portion 49. That is, it is configured as shown in FIG. Main circuit conductor 2
The upper end 22a has a fixed electrode 22b having a slight play in the vertical plane with respect to the upper end 22a. The fixed electrode 22b is formed on the upper end 22a and has an inner diameter larger than the outer diameter of the bolt 22d. A bolt 22d inserted into the hole 22c is screwed into the fixed electrode 22b. A fitting hole 22e is formed in the fixed electrode 22b.
Eight protruding electrodes 50 are fitted in the fitting holes 22e.

As the cable head 48, a T-shaped cable head is used. The T-shaped cable head is a T-shaped cable head provided with a terminal (not shown) for applying a DC withstanding voltage on the side opposite to the protruding electrode 50.
This terminal portion is closed by a blind plate 48a.

Next, the operation of the power receiving unit will be described. In order to take out the disconnector 9 from the bus tanks 4a, 4b, after the insulating gas is discharged, the main circuit conductor 10 is removed from the fixed contacts 9a and the buses 7, 8, and then as shown in FIG. By removing the mounting plate 12 from 4b, the disconnecting switch 9 and the operation unit 21 are removed leaving the fixed contact 9b. In order to take out the circuit breaker 26 and the like from the equipment tank 3, the insulating plate 35 is removed from the equipment tank 3 after discharging the insulating gas, so that the circuit breaker 26, the earthing switches 27 and 28, and the operation parts 36 and 37 are removed. . From equipment tank 3 to disconnector 29, ground switch 3
0, To remove the operation unit 33, these devices are removed by removing the mounting plate 32 from the device tank 3. The lightning arrester 31 is removed from the equipment tank 3 by removing the mounting plate 42.

The connection between the device to be removed and the remaining devices is determined by the relationship between the fixed contact 9b and the movable contact 9c in FIG.
With the configuration of 39, 43, the work of attaching and detaching is easy. Therefore, the work of assembling the power receiving unit and exchanging the device is easy.

Next, FIG. 7 shows the handling when an accident occurs in one of the pair of buses 7, 8. First, the bus tanks 4a and 4b are separated from the equipment tank 3. At this time, the three-phase insulating spacer 14 is
a, 4b, so that the busbar tanks 4a, 4b,
4b, only the insulating gas in the equipment tank 3 is extracted without extracting the insulating gas. Then, the pair of penetrating main circuit conductors 11 is separated from the connection main circuit conductor 11a. After that, the insulating gas in one of the bus tanks where the accident has occurred is extracted and repaired.

Next, FIG. 8 shows the handling when an accident occurs in the equipment tank 3. With the busbar tanks 4a and 4b left, only the equipment tank 3 can be pulled out forward or backward. First, after the insulating gas in the equipment tank 3 is removed, the mounting plate 35 is removed from the equipment tank 3, and the connection main circuit conductor 11a is separated from the penetrating main circuit conductor 11 and then pulled to the left to be removed. The penetrating main circuit conductor 11 can be split up and down at the three-phase insulating spacer 14, and after removing the lower part, the equipment tank 3 is moved horizontally for repair.

When performing a DC withstand voltage test of the gas insulated switchgear, the right blind plate 48a of the cable head 48 in FIG. 5 is removed, and the cable head 48 is removed by applying a DC voltage to a terminal (not shown). Can be done without.

Although the grounding switches are provided on the main circuit conductors on both the bus side and the cable head side of the circuit breaker, only one of them may be a grounding switch, and the other may be a simple switch.

[0028]

As can be seen from the above description, claim 1
According to the gas insulated switchgears according to Nos. 1 to 8, since the operation unit is concentrated on the front surface, a plurality of units can be closely arranged in the lateral direction, and the installation area of the gas insulated switchgear is reduced. And
Since the operation unit is concentrated on the front, maintenance becomes easy. Further, since the installation area of the gas insulated switchgear is reduced and the size and weight are reduced, the cost for transporting the gas insulated switchgear is reduced.

According to the gas insulated switchgear of the third aspect, since the vacuum circuit breaker is used as the circuit breaker, no harmful decomposition gas is generated as in the case of using the gas circuit breaker. Therefore, there is no adverse effect on the environment and the human body.

According to the gas insulated switchgear according to the fifth aspect, since the penetrating main circuit conductor is provided detachably with respect to the connection main circuit conductor, the equipment tank can be taken out from the front or the back, and in the unlikely event of an abnormality. Time response can be done in a short time.

According to the gas insulated switchgear of the seventh and eighth aspects, since the T-type cable head is used, the test can be performed by applying a DC withstanding voltage without removing the cable head.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power receiving unit showing an embodiment of a gas insulated switchgear according to the present invention.

FIG. 2 is a single-line diagram of a power receiving unit.

FIG. 3 is a detailed view of a portion A in FIG. 1;

FIG. 4 is a detailed view of a portion B in FIG. 1;

FIG. 5 is a detailed view of a portion C in FIG. 1;

FIG. 6 is an operation explanatory view of the power receiving unit showing the embodiment of the gas insulated switchgear according to the present invention.

FIG. 7 is an operation explanatory view of the power receiving unit showing the embodiment of the gas insulated switchgear according to the present invention.

FIG. 8 is an operation explanatory view of a power receiving unit showing the embodiment of the gas insulated switchgear according to the present invention.

[Explanation of symbols]

3 ... Equipment tanks 4a, 4b ... Bus tank 7 ... Kou bus 8 ... Oto bus 9,29 ... Disconnector 9a, 9b, 29a, 29b, 30a, 30b ... Fixed contacts 9c, 29c, 30c ... Movable contacts 10,22, 23, 34 ... main circuit conductor 11 ... penetrating main circuit conductor 11a ... connection main circuit conductor 12, 32, 35, 42 ... mounting plate 14 ... three-phase insulating spacers 21, 33, 36, 37 ... operating parts 27, 28, 30 … Ground switch 46… Cable storage part 48… Cable head

Claims (8)

[Claims] An apparatus tank filled with an insulating gas is provided, and a pair of bus tanks, which are arranged on the ceiling side of the equipment tank, house the bus and are filled with the insulating gas, are provided. A cable storage portion is provided in the atmosphere of a portion located on the rear side of the equipment tank, and the cable head is stored in the cable storage portion and the cable head is provided in an airtight manner through the rear surface of the equipment tank. In the equipment tank, a circuit breaker and a plurality of switches are electrically connected between the bus bar and the cable head, and an operation unit for operating the circuit breaker and the switch is provided on the front of the equipment tank. A gas insulated switchgear, wherein the switch is arranged and provided in the atmosphere. 2. A switchgear comprising the circuit breaker and a pair of switches arranged on the bus side and the cable head side of the circuit breaker is connected to a main circuit conductor fixed to the bus side and the cable head side. The gas insulated switchgear according to claim 1, which is detachably provided. 3. The circuit breaker is a vacuum circuit breaker having a vacuum interrupter provided on an inner surface side of a mounting plate, and an operation unit operatively connected to the vacuum interrupter is provided on an outer surface side of the mounting plate. 3. The gas insulated switchgear according to claim 2, wherein the mounting plate is air-tightly and detachably mounted on the opening on the front surface of the equipment tank. 4. The gas-insulated switchgear according to claim 2, wherein at least one of the pair of switches is a ground switch. 5. Each of the buses is connected to a penetrating main circuit conductor that air-tightly penetrates the bus and the equipment tank via a switch in each of the bus tanks, and is electrically connected to the switch. 5. The gas-insulated switchgear according to claim 1, wherein a through main circuit conductor is detachably connected to the fixed connection main circuit conductor. 6. A switch according to claim 1, wherein a grounding switch is provided between said switchgear and the cable head.
A gas insulated switchgear according to claim 1. 7. The gas insulated switchgear according to claim 1, wherein a T-shaped cable head is used as the cable head. 8. The gas insulated switchgear according to claim 7, wherein a terminal for a DC test is provided on the T-shaped cable head.