JPH0620327B2 - Gas insulated switchgear - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear installed in an electric station such as a substation.

2. Description of the Related Art Recently, as a gas-insulated switchgear installed in a substation or the like, a gas-insulated switchgear having a structure in which a plurality of devices constituting the switchgear are housed in a common metal container filled with a relatively low-pressure insulating gas has attracted attention. . According to this structure, it is possible to make the structure much simpler than a gas-insulated switchgear of the type in which each device is housed in a separate annular container and the containers are connected to each other via an insulating spacer. In addition, it is possible to reduce the size of the device and save the installation space. Furthermore, since the appearance can be simplified, harmony with the surrounding environment can be achieved.

By the way, in this type of device that has been conventionally proposed,
A busbar, a cable head connected to a cable drawn from the busbar, a busbar-side disconnector and a line-side disconnector, and a busbar-side disconnector connected to the busbar through the busbar-side disconnector. Since the circuit breaker connected via the same was attached to the common container, it was not preferable because the whole operation had to be stopped if an accident occurred at any place. Also, when assembling the device, it was necessary to perform the assembly work in a narrow space because the parts of each device were inserted into the container through the hand holes provided in the container and the devices were assembled inside the container. It was very troublesome. Furthermore, when performing maintenance and repair, it is necessary to remove parts of each device from the container through the handhole and then remove each device from the container, which is a drawback that the inspection and repair work becomes very troublesome. . Further, in the conventional structure, it is difficult to standardize the parts, and thus there is a drawback that the cost is significantly increased.

Object of the invention The object of the present invention is to facilitate the assembly of the device, and also to perform the inspection and repair by cutting off only a specific part, and to standardize the parts easily. To provide a device.

Configuration of the Invention The present invention relates to at least one set of busbars, a cable head connected to a cable drawn out from the busbars, a busbar-side disconnector and a line-side disconnector, and connecting to the busbar through the busbar-side disconnector. A gas-insulated switchgear comprising a circuit breaker connected to the cable head via the line-side disconnector, wherein the switchgear of the present invention is a vertically long unit arranged with its longitudinal direction oriented in the vertical direction. A main unit configured by accommodating the circuit breaker and the disconnector in a main container, a busbar unit configured by accommodating the set of busbars together with the busbar-side disconnector in a busbar container, and a cable head for the cable head It is composed of a cable head unit configured by being attached to a container. First and second busbar mounting holes and cable head mounting holes are provided side by side in the vertical direction on the side surface of the main container, and the busbar unit is the first busbar unit.
And the second busbar mounting hole is connected to the inside of the main container in a gas-separated state, and the cable head unit is connected to the cable head mounting hole.

As described above, since the gas-insulated switchgear of the present invention is composed of the main unit, the busbar unit, and the cable head unit, it is sufficient to assemble each unit individually and then connect them to each other. Can be done easily. Also, because the busbar unit and the main unit are gas-separated, when an accident occurs in the busbar unit, the busbar unit can be separated from the main container and repaired without affecting the main unit. When an accident occurs in the main unit, the main unit can be repaired without disconnecting the main unit from the bus unit and causing a power failure in the bus. Since the first and second busbar mounting holes and the cable head mounting holes are provided on the side surface of the main container,
It is of course possible to construct an opening / closing circuit having a double busbar structure, and of course, it is possible to construct an opening / closing circuit having a single busbar structure by using one of the first and second busbar mounting holes. In this case, the main unit, the bus bar unit, and the cable head may have a common configuration in any of the configurations, so that it becomes easy to standardize each container and the devices arranged in each container.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 to 3 show an embodiment in which the present invention is applied to a switchgear having a double bus bar structure. FIG. 1 is a front view and FIG. 2 is a sectional view taken along line II-II of FIG. FIG. 3 and FIG. 3 are single line connection diagrams showing the electrical configuration of each phase of the embodiment.

In FIG. 3, BS1 and BS2 are first and second busbars, CB is a circuit breaker, and one end of the circuit breaker CB is the first and second busbar side disconnectors DS11 and DS12. 2 busbars BS1 and BS2, respectively. The other end of the circuit breaker CB is connected to the cable head CH via the line side disconnector DS2, and the cable head CH
A cable C is connected to. The above is the basic configuration of the switchgear with a double bus configuration, but in reality a grounding device is installed at an appropriate place as required, and a current transformer, lightning arrester, voltage transformer for instrumentation, etc. Is provided. In this embodiment, circuit breaker grounding devices ES1 and ES2 are provided between one end of the circuit breaker CB and the ground and between the other end and the ground, respectively, and the ground for the line side disconnector is connected between the line side terminal of the line side disconnector DS2 and the ground. A device ES3 is provided. Further, a current transformer CT is mounted on a conductor portion connecting the circuit breaker CB and the line-side disconnector DS2, and an instrument voltage transformer LPT is connected to a conductor portion connecting the disconnector DS and the cable head CH. Further, a lightning arrester A is arranged between the terminal of the cable head CH on the cross section DS2 side and the ground.

In this embodiment, two sets of the gas-insulated switchgear GIS having the above-described structure are provided, and the two sets of gas-insulated switchgear GIS are arranged side by side in the lateral direction as shown in FIG. The mechanical configurations of both gas insulated switchgear are exactly the same. The internal structure of each gas insulated switchgear GIS will be described below with reference to FIG.

In FIG. 2, reference numeral 1 denotes a vertically elongated main container, and this main container has an installation base 2 with its longitudinal direction oriented vertically.
It is supported via a pedestal 3 on. The main container 1 includes a main container body 100 formed in a vertically long cylindrical shape, and an upper lid 101 and a bottom lid 102 that hermetically close the upper and lower openings of the main container body 100. First and second busbar mounting holes 103 and 104 and a cable head mounting hole 105 are provided on the side surface of the cable in a straight line from the upper side to the lower side. These mounting holes are formed by welding a cylindrical tubular body 106 to the periphery of the holes provided in the main container body 100, and the mounting flanges 103 are provided at the open ends of the mounting holes 103 to 105.
a to 105a are provided. All of these mounting holes are formed to have the same diameter, and holes for bolt insertion are provided in each mounting flange at the same pitch to standardize the mounting holes. On the front side of the main container 1 (the above-mentioned mounting hole 103
Device mounting holes 107 and 108 are provided side by side on the side surface (opposite to the side of the through holes 105 to 105). The device mounting holes 107 and 108 are formed by welding a tubular body 109 to the peripheral edge of the hole provided in the side wall of the main container body in the same manner as the mounting holes 103 to 105, and at the open ends of the device mounting holes 107 and 108. Mounting flanges 107a and 108a are provided, respectively. The device mounting holes 107 and 108 are formed to have the same shape and size, and both device mounting holes are standardized.

A device mounting plate 110 is mounted so as to hermetically close a device mounting hole 107 provided on the upper side wall of the front side of the main container 1, and the device mounting plate 110 supports a three-phase circuit breaker CB. Each circuit breaker CB is a gas circuit breaker in which a fixed contact, a movable contact, and an appropriate arc extinguishing mechanism are housed in the container 4, and one end of the cylindrical container 4 has a fixed-side terminal electrode 5 connected to the fixed contact. And a movable side terminal electrode 6 connected to the movable contactor is provided on the side surface of the container 4. The three-phase circuit breakers CB are arranged in a triangle so that the central axes of the respective containers 4 extend in parallel from the front side to the back side of the main container through the vertices of an imaginary triangle on the vertical plane. 4 is a mounting hole 110 provided in the device mounting plate 110
It penetrates through a and is supported by the device mounting plate. Container 4
Is provided with a flange 4a at its end, and the flange 4a is hermetically connected to the mounting hole 11a. Container 4
A mechanism portion 7 accommodating an operation mechanism for operating the movable contactor of the circuit breaker is attached to the end portion outside the main container, and the inside of the container 4 is hermetically closed by the mechanism portion 7. The mechanism portion 7 can be removed from the container 4,
By removing this mechanism, the inside of the container 4 of each circuit breaker can be inspected without opening the inside of the main container. In this embodiment, the circuit breakers are arranged so that the fixed-side terminal electrodes 5 of the three-phase circuit breakers CB face the first bus bar mounting holes 103, and the fixed-side terminal electrodes 5 of the circuit breakers CB are A conductor connecting portion 5a is provided in a portion facing the first busbar mounting hole 103. Further, fixed electrodes 8 and 9 for the grounding device are provided on the fixed side terminal electrode 5 and the movable side terminal electrode 6 of the three-phase circuit breaker CB, and the fixed electrode 8 and 9 is provided on the upper lid 101 of the main container 1. Movable electrode units 10 and 11 for grounding devices, which respectively constitute grounding devices ES1 and ES2 for circuit breakers, are attached. The movable electrode units 10 and 11 for the grounding device are configured such that the rod-shaped movable electrodes that come into contact with and separate from the fixed electrodes 8 and 9 are linearly displaced by an appropriate mechanism, and the operation axis of the movable electrodes is led out of the main container. ing.

A device mounting plate 111 is mounted so as to hermetically close the device mounting hole 108 on the front side of the main container, and the line side disconnector DS2 is supported on the inner surface of the device mounting plate 111.
The disconnector DS2 is composed of a movable contactor unit 14 and a fixed contactor unit 15 supported by a substantially V-shaped insulating support 13, with the movable contactor unit positioned on the circuit breaker side, and both contactor units. The central axes of 14 and 15 are arranged in the vertical direction. Movable contact unit 1
Reference numeral 4 comprises a rod-shaped contactor arranged in the shield so as to be linearly moved by an appropriate operation mechanism, and the fixed contactor unit 15 has a tulip contact arranged in the shield for contacting and separating the movable contactor. It consists of things. The movable contactor of the disconnector DS2 of each phase is connected to the movable side terminal electrode 6 of the circuit breaker CB of the corresponding phase via the connection conductor 17, and the through-type current transformer CT is attached to each connection conductor 17. There is. A fixed electrode 18 for the grounding device is provided in the fixed contactor unit 15 of each disconnector DS2, and a rotary type movable electrode 19 for the grounding device that constitutes the grounding device ES3 together with the fixed electrode 18 is provided in the vicinity of the fixed electrode. Is provided. The movable electrode 19 is supported on the device mounting plate 111 by appropriate means. One end of the connecting conductor 20 is connected to the fixed contactor unit 15 of each disconnector DS2, and the other end of the connecting conductor 20 is arranged near the cable head mounting hole 105 on the rear side of the main container. An instrument voltage transformer LPT is fixed to the bottom plate 102 of the main container 1, and the terminals of the transformer are connected in the middle of the connection conductor 20.

On the front side of the main container 1, the operation device boxes 21 and 2 are arranged vertically.
2 is arranged, and the operation box 21 on the upper side is the equipment mounting plate 11
0 and 111, and the lower operator box 22 is supported by the equipment mounting plate 111, respectively. Upper operation box 1
A circuit breaker CB and operating devices for the grounding devices ES1 and ES2 are housed in the device 10, and a disconnecting device D is provided in the operating device box 111 below.
The operation devices of S2 and the grounding device ES3 are stored. The operation device in each operation device box is connected to the operation shaft of the corresponding device via a link mechanism or the like.

Each of the above parts constitutes a main unit composed of a device including a circuit breaker and a circuit breaker arranged between the busbar-side disconnector and the cable head.

First and second busbar mounting holes 10 on the back side of the main container 1
First and second busbar units 23 and 23 are attached to 3 and 104, respectively.

Each busbar unit includes a first tubular portion 25a and a second tubular portion 25 provided so as to be orthogonal to the first tubular portion 25a.
It is provided with a tubular container 25 formed in the shape of a cross tube consisting of b and b. The tubular container 25 of each of the busbar units 23 and 24 has one end of its first tubular portion 25a aligned with the first and second busbar mounting holes 103 and 104, and the second tubular portion 25b laterally. The first tubular portion 25a is arranged rearward and rearward of the main container in an oriented state, and one end of the first tubular portion 25a is airtightly connected to the mounting holes 103 and 104 via an insulating spacer 26 by flange coupling. Insulation spacer 26
The three-phase conductors 27 are provided so as to penetrate airtightly, and the disconnector fixed contactor 28 is attached to the ends of these conductors located inside the tubular container 25. Second tubular portion 25b of tubular container 25 of first and second busbar units 23 and 24
Inside, three-phase busbar conductors 30 constituting the first and second busbars BS1 and BS2 are arranged in parallel, and these busbar conductors 30 are attached so as to hermetically close both ends of the second tubular portion 25b. Is supported by the insulating spacers. Each of the busbar conductors 30 of each phase of the first and second busbar units 23 and 24 has a fixed contactor 2 for the disconnector of the corresponding phase.
A movable contactor unit 31 for a disconnecting switch facing 8 is attached. Each movable contact unit 31 is a fixed contact for a disconnector of each phase of the first busbar unit 23, in which a rod-shaped contact that moves linearly and comes in contact with and separates from the fixed contact 28 is arranged in the shield together with its drive mechanism. 28 and the movable contactor unit 31 constitute a first busbar-side disconnector DS11. The second busbar side disconnector DS12 is constituted by the disconnector fixed contact 28 and the movable contactor unit 31 of each phase of the second busbar unit 24. The lid plate 32 is attached so as to airtightly close the back side opening of the first tubular portion 25a of each tubular container 25, and the bus bar side disconnection is provided on the outer surface of the lid plate 32 of the first and second bus bar units 23 and 24. Bowl D
Controller box 3 containing the controller for operating S11 and DS12
3 and 34 are attached. Control box 33 and 34
The operating device inside is the side wall of the first tubular portion 25a or the cover plate 32.
Is connected to the operating shaft of the movable contactor 30 of the disconnector DS11 or DS12 of the corresponding phase by an appropriate mechanism such as a link provided through the airtightly. In addition, 35 is a disconnector DS
It is a shield arranged between the disconnecting device and the mechanism for connecting the 11 or DS12 to the operating device. First busbar unit 2
The conductor 27 of each phase provided on the insulating spacer 26 of No. 3 is connected to the fixed side terminal electrode 5 of the circuit breaker CB of the corresponding phase via the connecting conductor 36, and is connected to the insulating spacer 26 of the second busbar unit 24. The provided conductor 27 is connected to the fixed-side terminal electrode 5 of the circuit breaker CB of the corresponding phase through the connecting conductors 37 and 38.

A cable head unit 40 is arranged below the second busbar unit 25. The cable head unit 40 is a tubular first member whose axis is oriented horizontally.
And a second tubular container 42 having a tubular shape and having its upper end flanged to an opening 40a provided on the lower surface of the first container 41 and having its axis oriented vertically. A container 43 is provided, and one end of the first container 41 is hermetically connected to the cable head mounting hole 103 of the main container 1 via an insulating spacer 43 by flange coupling. The lower end of the second container 42 is arranged so as to face the opening of the cable pit 45 provided underground, and the lid plate 46 is attached so as to hermetically close the lower end opening of the second container 42. . The three-phase cable heads CH are hermetically pierced through the cover plate 46 and are attached with their central axes oriented in the vertical direction.
A connector 47 attached to the end of the cable C standing up in the cable pit is connected to. A three-phase conductor 48 is provided through the insulating spacer 44 in an airtight manner, and the line side disconnector D is provided at an end of the conductor on the main container side.
The connection conductor 20 connected to S2 is connected. The end of each conductor 48 located in the cable head housing is connected via a connecting conductor 50 to the cable head CH of the corresponding phase. A lid plate 51 attached so as to hermetically close the rear side opening of the first container 41 of the cable head container.
A three-phase lightning arrester LA is attached to each of the lightning arresters, and the non-grounded side terminal of each lightning arrester is connected to the connecting conductor 50 of the corresponding phase.

Main container 1, each busbar container 25 and cable head container 43
An insulating gas such as SF6 is filled in the interior at a low pressure of ² kg / cm ² or less.

A rectangular parallelepiped cover container 60 is attached to the front side of the main container 1 and is attached to the front side of the main container 1, such as the mechanism section 7 attached to the end of the circuit breaker CB and the operation device boxes 21 and 22. All the constituent members are covered with a cover container 60. As shown in FIG. 1, openable doors 61 and 62 are provided on the front surface of the cover container 60, and by opening these doors, it is possible to inspect and operate the equipment in the operation box 21 and 22. It is like this. An opening for inspecting the circuit breaker is provided above the door 61, and the opening is closed by a removable cover 63. Cover container 6
0 is provided so as to cover substantially the entire front surface of the device, and is designed so that the entire device looks like a rectangular parallelepiped when viewed from the front side.

A gas-insulated switchgear GIS is configured by the above-mentioned parts,
When a plurality of gas-insulated switchgears are installed at an electric station, a plurality of gas-insulated switchgears GI are installed as shown in FIG.
Ss are arranged side by side in the lateral direction, and the busbar conductors of the first and second busbar units of the adjacent GIS are connected to each other.
In this case, since the busbar units are connected to each other by connecting the busbar containers of the adjacent gas-insulated switchgear to each other through the insulating spacers supporting the busbar conductors, the distance between the adjacent gas-insulated switchgear is extremely small. Can be made smaller. Therefore, it is possible to configure a row board in which a plurality of gas-insulated switchgears are arranged close to each other, which not only simplifies the appearance and facilitates harmony with the surrounding environment but also contributes to improving the efficiency of equipment inspection. be able to.

The assembly of the apparatus of the above embodiment can be performed in the following order, for example. First, the voltage transformer LPT for an instrument is inserted and fixed in the main container 1 through the device mounting hole 108 on the front surface side. Next, the equipment mounting plate 110 with the circuit breaker CB attached is attached to the equipment mounting hole 107, and the disconnector D
The device mounting plate 111 supporting S2 is attached to the device mounting hole 10
Attach to 8. Next, the mounting hole 103 on the back side of the main container 1
Through 105 as hand holes circuit breakers and disconnectors DS2
And the current transformer CT are attached, and further, the disconnector DS2 and the voltage transformer LPT for the instrument are connected. Then, the preassembled second busbar unit 24 is attached to the mounting hole 104 on the rear surface side of the main container 1, and the mounting hole 103 is used as a handhole for the second busbar unit 24 and the circuit breaker CB.
Make a connection with. Next, the first busbar unit 23 is attached to the mounting hole 103 of the main container 1, the first busbar unit and the breaker CB are connected through the opening at the upper end of the main container 1, and then the upper lid 101 is attached. Next, mounting hole 10
5, the cable head unit 40 is attached, and further, each operation device box and the cover container 60 are attached to complete the assembly of the apparatus.

With the above configuration, when an accident occurs in the main unit, the main units can be separated from both the busbar units and pulled out to the front without causing a power failure in the busbar units 23 and 24. Inspection and repair can be performed. When a ground fault or the like occurs in the busbar unit, only the busbar container 25 can be separated from the insulating spacer 26 without opening the main unit, and the busbar unit can be inspected and repaired.

By the way, when an OF cable or the like is used, the attachment of the cable head is usually performed when the cable manufacturer processes the end of the cable, and at the assembly site of the gas insulated switchgear, the assembler does not remove the cable head from the cable. Unacceptable. According to the above-mentioned embodiment, the cable head CH can be attached to the cable end after the cable head CH is attached to the cable end, so that the apparatus can be easily assembled even when the attachment / detachment of the cable head is not permitted as described above. It can be carried out. That is, OF
When a cable or the like is used, the lid plate 46 is attached to the cable head in advance when the cable head is attached and the cable head CH is attached, and the cable head is attached to the cable head container 43 before attaching the cable head container 43 to the main container. The attached lid plate 46 is positioned at the opening of the cable pit 45. After that, the second container 42 constituting the cable head container 43 is connected to the lid plate 46, then the first container 41 is connected to the second container 42, and the main container 1
It is connected to the mounting hole 105 of.

Next, FIGS. 4 and 5 show another embodiment of the present invention. In this embodiment, the disconnector DS is provided on the front side of the main container 1.
Only the equipment mounting hole 108 for mounting 2 is provided, and the circuit breaker CB is supported by the upper lid 101 and inserted into the main container 1 through the upper end opening thereof. The busbar units 23 and 24 are constructed similarly to the embodiment shown in FIGS. 1 and 2 and are attached to the main container 1 with the same structure as that of the embodiment.
In this embodiment, the movable side terminal electrode 6 provided on the side surface of the container 4 of the circuit breaker CB is connected to the first bus bar unit 23 via the connection conductor 70, and the fixed side terminal electrode 5 of the circuit breaker is connected to the connection conductor. It is connected to the second busbar unit 24 via 71. The reference numeral 72 designates disconnectors DS11 and DS that are led out to the outside through the side wall of the first tubular portion 25a of the busbar container.
It is a link that connects the 12 operation shafts to the operation devices in the operation device boxes 33 and 34.

The cable head container 40 is composed of a single tubular container, and in this embodiment, the cable head CH is attached to the outside of a lid plate 51 that closes the end of the container 40. Each cable head is connected via a connecting conductor 73 to a corresponding phase disconnector DS
2 is connected to a conductor 74 connecting the instrument transformer LPT, and a current transformer CT is attached to each connection conductor 73.

The operation device boxes 21 and 22 are housed in the front surface of the main container 1, the operation device of the circuit breaker CB is provided in the operation device box 21, and the operation of the disconnector DS2 and the grounding device ES3 is provided in the operation device box 22. The container is stored. In this embodiment, the circuit breaker grounding devices ES1 and ES2 are omitted.

A cover container 60 is further attached to the front surface side of the main container 1, and a door 6 used for inspecting the devices in the operation device box 21 and the operation device box 22 is attached to the front surface of the cover container 60.
1'and 62 'are provided.

Although the main container, the busbar container, and the cable head container are basically cylindrical in the above embodiments, containers having other shapes such as a rectangular parallelepiped or a cube may be used.

In the above embodiment, the gas insulated switchgear having the double busbar configuration is taken as an example, but the present invention can be similarly applied to the gas insulated switchgear having the single busbar configuration. In the case of a single busbar structure, the busbar unit is attached to one of the first and second busbar mounting holes.

As described above, since the device of the present invention is composed of the main unit, the busbar unit, and the cable head unit, it is sufficient to assemble each unit individually and then connect them to each other. Assembly can be easily performed. Also, because the busbar unit and the main unit are gas-separated, when an accident occurs in the busbar unit, the busbar unit can be separated from the main container and repaired without affecting the main unit. When an accident occurs in the main unit, the main unit can be repaired without disconnecting the main unit from the bus unit and causing a power failure in the bus. Further, since the first and second busbar mounting holes and the cable head mounting holes are provided on the side surface of the main container, it is of course possible to configure an opening / closing circuit having a double busbar structure, and of course, for the first and second busbars. By using one of the mounting holes, a switching circuit having a single busbar structure can be constructed. In this case, the main unit, the busbar unit, and the cable head may have a common configuration in any of the configurations, and thus there is an advantage that standardization of each container and the equipment arranged in each container can be facilitated.

[Brief description of drawings]

FIG. 1 is a front view showing the structure of an embodiment in which the present invention is applied to a switchgear having a double bus bar structure, and FIG. 2 is a II-II of FIG.
FIG. 3 is a front view showing another embodiment of the present invention, FIG. 5 is a view of FIG. 4 of FIG. It is a VV line sectional view. 1 ... Main container, 103 ... First busbar mounting hole, 10
4 ... second busbar mounting hole, 105 ... cable head mounting hole, 23 ... first busbar unit, 24 ...
Second busbar unit, 25 ... Busbar container, 26 ... Insulating spacer, 40 ... Cable head unit, 43 ...
Cable head container, CB ... Circuit breaker, DS11, DS12
...... Bus side disconnector, DS2 ...... Track side disconnector, CH ……
Cable head, ES1 to ES3 ... Grounding device, CT ...
… Current transformer, LPT …… Voltage transformer for instrument, LA …… Lightning arrester.

Claims (1)

[Claims] 1. At least one set of busbars, a cable head connected to a cable drawn from the busbars, a busbar-side disconnector and a line-side disconnector, and the busbar being connected to the busbar via the busbar-side disconnector. In a gas-insulated switchgear comprising a circuit breaker connected to a cable head via the line-side disconnector, the circuit breaker and the disconnector are provided in a vertically long main container arranged with its longitudinal direction oriented vertically. A main unit configured to be housed, and a busbar unit configured to house the one set of busbars in a busbar container together with the busbar side disconnector;
A cable head unit configured by attaching the cable head to a cable head container, wherein first and second busbar mounting holes and a cable head mounting hole are provided side by side in the vertical direction on the side surface of the main container. The busbar unit is connected to one of the first and second busbar mounting holes in a gas-separated state in the main container, and the cable head unit is connected to the cable head mounting hole. A gas-insulated switchgear characterized in that