JPS60187216A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a gas insulated fl
il closing device.

Prior Art Gas-insulated switchgear that has been widely used in the past includes circuit breakers,
Necessary equipment such as a grounding device and a current transformer were housed in separate metal containers filled with SF6 gas, and the predetermined metal containers were interconnected via insulating spacers. However, 4 like this? In the construction of a container, a large number of containers are assembled in a complicated manner, which results in a complicated process, making the device large and requiring a large amount of installation space. Therefore, recently, various improved gas-insulated switchgears have been proposed that are designed to simplify the structure by storing multiple devices in a common container. As an improved type of gas insulated switchgear,
Regardless of the configuration of the circuit, a circuit breaker that is necessary and several devices connected to the circuit breaker are housed in a common shell container to constitute a main unit, and the main unit is equipped with a bus bar. A structure that connects other units as necessary, such as a busbar unit in which the line and bus-side disconnector are housed in a common container, or a cable head unit in which the line/side disconnector and cable head are housed in a common container. There is something like that.

With this configuration, gas-insulated switchgear with various circuit configurations can be easily constructed around the main unit, and the installation area can be reduced compared to conventional gas-insulated switchgear. can. However, in this type of device that has been proposed in the past, the instrument voltage transformer that controls the road side voltage is connected to the outer shell of the main unit.
The voltage +' could only be connected to the conductor portion that connects the transformer to the line side terminal of the circuit breaker. However, depending on the configuration of the electrical station, it may be necessary to connect the voltage transformer to the conductor between the line-side disconnect switch and the cable head, and the improved gas-insulated switchgear that has been proposed so far does not meet this requirement. could not be adapted to the situation.

OBJECTS OF THE INVENTION An object of the present invention is to provide an improved gas insulated switchgear capable of connecting an instrument transformer to either the disconnector side terminal or the cable head side terminal of the line side I17I. !■ Our goal is to provide the following.

4F4 configuration of the invention The present invention has a main unit configured by housing circuit breakers for at least three phases in an outer shell container, and
A three-phase line-side disconnect switch and a three-phase cable head connected to the firearm in the main unit via the line-side disconnect switch are housed in a cable head container having a single opening.
and a cable head unit 1 to which an insulating base bottle for connecting the main unit is attached to the frontage opening in the horizontal direction, and the horizontal opening of the cable head container is connected to the insulating space (through the insulating space). , and is intended for a gas insulated switchgear which is connected from the horizontal direction to one part of the equipment connection section provided in the main one-knit outer shell container.

In the present invention, the cable head is vertically attached to a lid plate that closes the "" section between the F ends of the cable head container, and the line-side disconnector is disposed above the cable spatula 1:. An instrument voltage transformer is attached to the upper part of the cable head container, and the voltage transformer is electrically connected to the main unit side terminal or the cable head side terminal of the line side disconnector. The circuit breaker housed in the outer shell container of the unit may be of any type as long as it stores a circuit breaker consisting of a movable contact, a fixed contact, and an arc extinguishing mechanism in the circuit breaker container. For example, there are buffer-type cass circuit breakers that extinguish the arc by spraying arc-extinguishing gas onto the arc using a buffer cylinder, and arc-rotating type gas circuit breakers that use the magnetic force generated by the arc current to rotate the rear arc to extinguish the arc. A circuit breaker etc. can be used.

The outer shell container may have an approximately cylindrical shape as a whole, and the number of device connection openings provided on the side wall thereof is arbitrary.

In addition to the device connection opening, the outer shell container is provided with other device connection openings as needed, and through the device connection openings, a predetermined switching circuit (electrical station The other equipment necessary for constructing the gas insulated switchgear is housed in an appropriate container and the 14-unit unit is connected.

For example, in a gas insulated switchgear (feeder unit) installed between a busbar and a feeder connected to the busbar, a busbar side disconnect A bus unit 1~ in which a vessel is housed in a container,
A cable head unit in which a cable head and a line-side disconnector disposed between the cable head and the circuit breaker are housed in a container is connected to the 1131 device in the outer shell container through the device connection opening.

When using as the voltage transformer a plurality of transformers (usually two because the voltage between two of the three phases is measured) that detect the voltage between phases are housed together in an independent container. The voltage transformer is connected to the upper end opening of the cable head container via an insulating spacer for attaching the voltage transformer. In addition, if multiple voltage transformers that detect phase-to-phase voltage are installed in separate containers without being covered,
Each transformer is housed in the upper part of the cable head container.

Effects of the Invention As described above, according to the present defense, a line-side disconnector is arranged at the upper part of the cable head container connected to the main unit, and an instrument voltage transformer is installed in the L section of the cable head container. Since the voltage transformer is arranged, the voltage transformer can be connected to either the main unit 1 side terminal or the group head side terminal of the line side disconnector, making it possible to provide diversity in the circuit configuration. In addition, the space near the top of the cable head container is usually a dead space, and in the present invention, this dead space is used to arrange the voltage transformer, so the space can be used effectively. By taking advantage of the characteristics of the opening/closing device, it is possible to further downsize the device.

Example The present invention will be described in detail below with reference to the accompanying drawings.

1 to 3 show a first embodiment in which the present invention is applied to a feeder unit disposed between a bus bar and a feeder, and therefore show the electrical configuration of each phase of the same embodiment. A single line diagram is shown in FIG.

In FIG. 7, BSl and BS2 are the first and second bus bars, respectively, [) 311 and 1) 312 are the first and second bus side disconnectors, respectively, and the first bus 881 and the first 11 line side A first bus unit is configured by housing the disconnector [ ) 311 in a common container, and a second bus unit B
A second busbar unit is configured by housing S2 and the second Bl line side disconnector DS12 in a common container. CB is the circuit breaker, [311 and ES12 are the first
and second grounding devices for circuit breaker inspection, CTa to CTc are current transformers fitted to current transformer conductors, and these mfai circuit CB and both grounding devices ES1. ES2 and current transformers CT-a to C1-c are housed in an outer shell container to constitute a main unit. DS2 is a track side disconnector, CH is a cable head, ES2 is a grounding device for the cable head, and LA is a lightning arrester.These cable head C11, grounding device [S2, and lightning arrester LA are housed in a common container to form a cable head unit. configured. Further, Pl- is a mouthpiece transformer provided on the side of the cable head unit 1 and connected to a cross body connecting between the disconnector O32 and the current transformer conductor.

Fig. 1 is a top view, Fig. 2 is a sectional view taken along the line II-IF in Fig. 1, and Fig. 3 shows the arrangement of separate containers within the outer shell container.
In these figures, 1 indicates the operating devices 1 to . 2
3A is the main unit located on the controller unit 1.
and 3B are first and second busbar units arranged vertically on the front side of the main unit 2, and 4 is the main unit 2.
It is a cable head unit located on the back side of the
A gas insulated switchgear GIS is constructed from these. In this embodiment, as shown in FIG. 1, two similarly configured gas insulated switchgear GIS are arranged side by side in the horizontal direction, and the bus bars B81 and BS2 of both gas insulated switchgears are connected to each other. It is connected.

The operating device unit 1 includes an operating device box 101 formed in the shape of a rectangular parallelepiped and placed on the installation base 5 with its longitudinal direction aligned with the front-rear direction of the device. An inspection door 102 for inspection is provided. A control panel 103 is arranged at the front end of the control box 101 and has push buttons for operation and monitoring equipment, and a frame 104 for supporting the control device is arranged adjacent to the control panel 103. There is. A circuit breaker operating device 105 and grounding device operating devices 106 and 107 are supported on the frame 104, and a cylinder 108 for supplying compressed air to an air cylinder that drives the operating device is arranged below the frame 104. has been done.

The main unit 2 includes a cylindrical outer shell container 201, and the outer shell container 201 is arranged so that the axis of the outer shell container 201 is oriented in the vertical direction.
It is arranged on the upper surface near the rear end of 01. Outer shell container 2
Between the lower ends of 01 [one part is hermetically closed by an equipment support plate 202 which also serves as a bottom plate, and the upper end is closed by a removable lid plate 2
It is closed airtight in 03. "1" is located on the upper surface of the rear end of the controller box 101 at a position facing the equipment support plate 202.
109) is installed, and during this time, the firearm inside the outer shell container 2 is connected to the controller in the controller box 101 through the section.On the front side of the side wall of the outer shell container 201 First and second device connection openings 2 spaced apart from each other vertically.
01a and 201b, and a third I firearm connection opening 201C/J' is provided on the back side of the side wall of the outer shell container 201.
X is established. Each separate container connection opening is constructed by welding a short pipe to the periphery of a hole made through the side wall of the outer shell container, and the outer end of each short pipe is A flange f is provided.

The equipment support plate 202, which also serves as the bottom plate of the outer shell container, is the controller box 1.
A support leg 204 is arranged to close the opening 109 of the device support plate 202 and fixed to the operator box.
A three-phase circuit breaker CB is mounted on the circuit breaker mounting plate 205 which is fixed via the circuit breaker mounting plate 205. Each circuit breaker CB houses a movable contact, a fixed contact, and an appropriate arc-extinguishing mechanism in a cylindrical breaker container 206, and has a side surface near the upper end and a side surface near the lower end of the cylindrical container 206, respectively. A fixed side terminal 207 connected to a fixed contact and a movable side terminal 208 connected to a movable contact are provided. The three-phase circuit breakers CI3 shown in Fig. 3 are arranged at 11 points of an isosceles triangle with their respective axes facing up and down, and the lower ends of each are located at the 11 points of the isosceles triangle. It is attached to the inner plate 205. The operating shaft 209 for operating the movable contact of each circuit breaker CB passes through the plate 205 and is guided downward, They are interconnected by a three-phase connecting plate 210. A common operating shaft 211 is installed in the center of the three-phase connecting root 210, and the operating shaft 211 is operated by airtightly and slidably passing through a thrust bearing 212 attached to a plate 202 for mounting equipment. It is led out into the container box 101. Common operating shaft 21 led out into the operating device box 101
1 is the drive shaft 105 of the operating device 105 via the lever 240.
The drive shaft 105a is connected to the drive shaft 105a as shown in FIG.
When the common operating shaft 211 is driven in the left and right directions, the common operating shaft 211 is driven in the F direction and upward, so that the three-phase circuit breakers CB are operated at once. Figure 2 shows the circuit breaker CB for each phase.
J3 indicates a closed state. From this state, when the drive shaft 105a is driven to the left, the
The container CB opens.

A conductor 214 that is connected to the first bus unit through a contact IFC conductor 213 is connected to the fixed side terminal 207 installed on the upper front side of the circuit breaker CB of each phase.
Connect the conductor connection part installed in 4 to the front side of the circuit breaker.
The upper ends of the nine branch bodies 215 are connected to each other. In addition, the iiJ moving side end terminal 208 of the circuit breaker CI3 of each phase, the current transformer conductor 217 of each phase (current transformer in The upper ends of the current transformer conductors 217 are connected to each other through a connecting portion (A218), and three current transformers CTa to CTc of each phase are fitted into each current transformer conductor 217.

At the lower end of the branch conductor 215, a conductor 220 connected to the second bus unit 3B is connected to the fixed side unit 22 of the grounding device.
1 is connected to C. The movable side unit 223 of the grounding device is mounted on the equipment support plate 202 via the frame 222 (= J is removed, the fixed side unit h 221 and the movable side = 1
The knit 223 constitutes a '1st' IM disconnection inspection grounding device ES11. Each movable side 1 unit 223 is in contact with a fixed contact provided on the fixed side unit by 11ft'.
One bar-shaped movable contactor 224 is installed, and the movable contactor 224 of the earthing device ES11 of each phase is connected to a lever 225.
It is connected to a common rotation operation shaft 226 via. The operating shaft 226 hermetically and rotatably penetrates the side wall of the outer shell container and is led out to the outside, and is further connected to the grounding device operating device 106 in the operating device box 101 by an appropriate connection BRIM 227 such as a link 134F1. ing. The operating device 10
6, the three-phase earthing device ES11 is opened and closed simultaneously.

Further, a fixed side unit 231 of a grounding device is connected to the lower end of the current transformer conductor 217. (A movable unit 233 of the grounding device is mounted on the firearm support plate 202 via a frame 232, and the fixed side unit 231 and the movable unit 233 connect the second circuit breaker inspection grounding device [
:312 is configured. Each movable side unit 233 is equipped with a rod-shaped movable 18 contactor 234 that approaches and separates from the fixed contactor provided on the fixed side unit l-231, and the movable contactor 234 of the earthing device ES12 of each phase is connected to a lever 235.
It is connected to a common rotation operation shaft 236 via.

The operating shaft 23G passes through the side wall of the outer shell container in an airtight and rotatable manner and is led out to the outside, and is further connected to the grounding device operating device 107 in the operating device box 101 by an appropriate connection mechanism 237 such as a link 1ffl IM. has been done.

The three-phase earthing device IES12 is opened and closed simultaneously by the operating device 107.

In Fig. 2, in order to prevent the diagram from becoming complicated, the circuit breaker C [3, branch conductor 215, and current transformer C1-] are shown for only one phase, and the circuit breakers and branch conductors of other phases are shown. Conductors and current transformers are not shown.

As shown in FIG. 1, the container 300 of the first bus bar unit 3A includes a first pipe 301 that extends horizontally in the front-rear direction, and a first pipe 301 that is arranged at right angles to the first pipe 301 and extends horizontally in the lateral direction. A three-phase bus line B is formed in the second tube 302 of the container 300.
Bus bar conductors 303u to 303W forming the SI are arranged in parallel. 3-phase m-line conductor 303u to 303W
is supported by an insulating spacer 304 disposed to hermetically close one end of the second tube 302. Also container 30
One end of the first pipe 301 of No. 0 is connected to the first BIZ connection opening 201a of the outer shell container 201 via an insulating spacer 305.
A fixed contact 307 of the first bus-side disconnector DS11 is connected to an end located inside the container 300 of an embedded conductor 306 which is airtightly connected to the insulating space 305 and is provided by passing through the insulating space 305 in an airtight manner. ing. In addition, the bus conductors 303u to 3
A movable contact 308 that constitutes a disconnector together with the fixed contact 307 is connected to 03W, and an operating rod 309 for operating the movable contact is an operating rod 309 disposed at the other end of the first pipe 301 of the container 300. It is connected to the IM structure 310. The operating shaft of the operating mechanism 310 is connected to an operating device 311A supported on the side surface of the container 300, and the three-phase disconnector 03ii is opened and closed simultaneously by the operating device 311A. In order to prevent the operating device 4i'5310 from disturbing the electric field near the disconnector D S 11, an electrostatic shield 312 is disposed between the operating mechanism 310 and the disconnector D S 11. A working opening 313 is provided at the other end of the first tube 301 of the container 300, and the opening is hermetically closed by a lid plate 314.

A conductor 214 connected to the fixed side terminal 207 of the circuit breaker is connected to the end located inside the outer shell container 201 of the embedded conductor 306 supported by the insulating space +) 305 of the busbar units 1 to 3A. , whereby the fixed terminals 207 of the circuit breakers CB of each phase are connected to the bus conductor of the first bus unit 3Δ.

The second I (1 line unit 3B is the first bus unit 1-B
The second nl line unit 3 is configured in exactly the same way as S1.
Fixed contact 307 and movable contact 3 in container 300 of B
In 2008, the second bus-side disconnector DS12 was constructed (f, i).The operating mechanism 31 of the second bus-side disconnector DS12
The operating shaft of 0 is connected to an operating device 311B attached to the side surface of the container 300 of the second bus bar unit.

The container 300 of the second bus unit 3B is the insulating spacer 3
A conductor that is airtightly connected to the second device connection opening 201b of the outer shell container 201 via Q5 and connected to the branch conductor 215 at the end of the embedded conductor 306 of the insulating spacer 305 located inside the outer shell container 201. 220 is connected.

The container 400 of the cable head unit 4 is made up of tubular bodies arranged with their axes facing in the vertical direction.
A first device connection opening (horizontal frontage) 400a is provided on the upper side surface of the front side (outer shell container side) of 0, and a second device connection opening 400b is provided at the upper end. ing. Furthermore, working openings 400c and 400d are provided on the side wall on the back side of the container 400, spaced apart from each other vertically. Opening 400a for first equipment installation
and the working openings 400c and 400d are both containers 4.
It consists of a short tube welded to the periphery of a hole made in 00,
A mounting flange f is provided at the end of the short tube of each opening.

The device connection opening 400a of the container 400 is connected to the third one of the outer shell container 201 via the main one-knit connection insulating spacer 401.
A three-phase embedded conductor 402 is provided in the insulating spacer 401 in an airtight manner. The upper end of the current transformer conductor 217 is connected to the end of the embedded conductor 402 located inside the outer shell container 201 via a connecting conductor 240 . Further, one end of a connecting conductor 403 is connected to the end of the embedded conductor 402 of each phase located inside the container 400, and the fixed contact 405 of the line-side disconnector DS2 is connected to the other end of the connecting conductor 403 of each phase. It is connected. Further, a conductor 408 extending vertically is supported by a frame 406 supported on the side wall of the container 400 via an insulating support 407, and a movable contact 409 of a line-side disconnector DS2 is connected to the upper end of the conductor 408. . The disconnect switch DS2 of each phase is provided coaxially with the embedded conductor 402 on an extension of the axis of the embedded conductor 402 of the insulating spacer 401, and the disconnect switch DS2 of each phase is fixed to its movable connected single element. Contacts are provided on the sides of the insulating spacer 401 so as to face each other in the horizontal direction. The operation rod 410 of the movable contactor 409 of the three-phase line-side disconnector DS2 is attached to the side of the container 400 (4). They are connected via a mechanism, and the three-phase disconnector DS2 is opened and closed at once by the operation mechanism.

At the lower end of the conductor 408 is a fixed contact 41 of the grounding device ES2.
2 are connected. Further, a movable contact 413 of the earthing device ES2 is supported on the frame 406, and the movable contact 413 of the earthing device ES2 is supported by the frame 406.
12 is connected to the operating device box 41 via the side of connection #3 (not shown).
It is connected to the grounding device operating device in 1, and is connected to the grounding device operating device in 3.
The phase grounding devices [S2 are operated all at once.

The lower end of the container 400 is hermetically closed by a bottom plate 415,
Three holes 416 are formed through the bottom plate 415 for connecting three-phase cables. and container 40
A three-phase cable head CH is installed vertically so as to airtightly close each of these three holes from the inside of C).
A connector 417 attached to the terminal of the connector 417 is connected through the hole 416 so that it can be inserted and removed. A lightning arrester t-A is arranged on the side of the cable head CH of each phase, and the non-grounding side terminal of the lightning arrester of each phase is connected to the terminal 418 at the upper end of the cable head C)-1 of the corresponding phase. It is connected to the conductor 408 of the corresponding phase via a conductor 419.

At the upper end of the container 400 (opening 400b for connecting several plates,
An instrument voltage transformer PT in which two transformers are housed in a common container 500 is connected to an insulating base 420 for connecting voltage transformers.
are airtightly connected through the

The two transformers constituting the voltage transformer PT are connected to three terminals 500U to 500
W is derived, and the three terminals are connected to a three-phase connection conductor 403. Also, the working opening 400 of the container 400
c and 400d are hermetically closed by cover plates 421 and 422, respectively.

In this embodiment, the container 400 of the cable head unit 4
A box 423 is placed below the cable C that rises from the underground cable pit, and the box 423 supports the container 400. With this configuration, the mechanical strength of the device can be increased. Note that this box body 423 can also be omitted.

When assembling the main unit 2 of the gas-insulated switchgear described above, first place the equipment support plate 202 on top of the operator box 101.
The circuit breaker CB and the grounding devices ES11 and [S12 (r■ moving side units 1 to 22
After installing 2,232, connect branch conductor 215 to circuit breaker CB.
and current transformer conductors 217, and current transformers CT a to C
Tc (J) is removed. After that, the outer shell container 201 is lifted up and lowered onto the equipment support plate 202, and the lower end of the outer shell container 201 is connected and fixed to the equipment support plate 202. Next, the outer shell container 201 is 201 first and second device connection openings 201a
and the first and second busbar units 3A and 3 in 201b.
B is connected, and the embedded conductor 306 of the insulating space 305 of the 1M wire Coco-knit 3A and 3B is connected to the conductors 214 and 220 from the upper end opening of the outer shell container 201. Furthermore, the cable unit 400 is connected to the device connection opening 201C of the outer shell container 201, and the current transformer conductor 217 and the insulating spacer 401 are connected through the upper end opening of the outer shell container 201.

Thereafter, the upper end opening of the outer shell container 201 is hermetically closed with the lid plate 203.

When installing multiple gas insulated switchgear GIS as shown in Fig. 1, B of one gas insulated switchgear GIS is required.
Second pipe 302 of container 300 of J line units 3A, 3B
Connect the end of the side where the insulating spacer is not attached to the pipe 32.
0 to the insulating spacer 30 of the other gas-insulated switchgear
Connect to 4.

Then, the busbars of adjacent busbar units are connected to each other through the insulating vane 304.

In the above embodiment, the circuit breaker CB and the circuit breaker inspection grounding devices ESII and ES12 are attached to the equipment support plate 202, which also serves as the bottom of the outer shell container, via the support legs 204 and the frame 232. is the equipment support plate 202
For example, as shown in FIG.
The crankcase 110 may be directly attached to the equipment support plate 202 which serves as the bottom plate of the crankcase 110 and the ceiling plate of the crankcase 110. In this example, the crankcase 110 has an airtight structure.
The inside of the crankcase is communicated with the inside of the outer shell container 201, and the side wall of the crankcase 110 is hermetically penetrated to connect the circuit breaker CB.
and earthing equipment 7IEs11. Operation shafts 240, 241, and 242 of the ES 12 are led out. and circuit breaker C
The operating shaft 240 of B is connected to the circuit breaker operating device 105 in the operating device box 101, and the operating shafts 241 and 242 of the grounding devices [S11 and [S12] are connected to the grounding device operating device 106.

In each of the above embodiments, the operating shafts of the grounding devices ES11 and ES12 for circuit breaker inspection are connected to the operating device individually, but the operating shafts of these grounding devices are connected inside the outer shell container (see Fig. 1). (in the case of Fig. 3) or inside the crankcase (in the case of Fig. 3)
(In the case of Fig. 4), both grounding devices are connected so that they can be opened and closed by one operating shaft, and the one operating shaft is passed through the side wall of the outer shell container or crankcase in an airtight manner. By connecting to a common operating device, both grounding devices 1ffEs11 and ES12 can be configured to be opened and closed at the same time.

In the above embodiment, the voltage transformer PT is connected to the circuit breaker side terminal of the disconnector DS2, but as shown in FIG. 5, it may also be connected to the line side terminal of the disconnector S2. . A single line diagram in this case is shown in FIG. In other words, according to the above embodiment, the voltage transformer PT is connected to the disconnector O32.
There is no need to change the configuration of the unit 4 either when connecting to the circuit breaker side of the disconnector DS2 or when connecting to the line side (cable head side) of the disconnector DS2.

In the above embodiment, the voltage transformer PT is disposed by effectively utilizing the dead space above the cable head unit. A certain amount of space is required above the outer shell container to enable inspection of the disconnector, and a certain amount of space is required above the cable head unit when installing the cable head unit on site. Therefore, the head space of the device cannot be eliminated.

Therefore, utilizing the upper space of this device to arrange a voltage transformer, which is not always provided, leads to effective use of spacers and greatly contributes to miniaturization of the device.

In the above embodiment, the voltage transformer PT is arranged outside the enclosure 400 of the cable head unit 1, but as shown in FIG. It can also be placed at the top. In this case as well, connect the voltage transformer to the circuit breaker side of the disconnector DS2 or to the line side (
Of course, it can be connected to either side (the cable head side). In the embodiment shown in Fig. M6, the container for the voltage transformer PT is not required, and the
20 is no longer required, so the structure can be easily covered.

In the above embodiment, the present invention was applied to a gas insulated switchgear having a switching circuit with a double busbar configuration, but by omitting one busbar unit, a gas insulated switchgear having a switching circuit with a TLL busbar configuration can be realized. It can also be configured.

If the upper end of the outer shell container 201 is configured to be opened as in each of the above embodiments, the circuit breaker CB can be easily inspected.

In addition, the circuit breaker CB, the current transformer' conductor 217, and the branch conductor 215
By arranging them in parallel, the outer shell container 201
Since the height of the controller box 101 can be lowered, the height of the controller box 101 can be increased, and a worker can therefore enter the controller box 101, making maintenance and inspection work easier. can.

If the operation shaft of the circuit breaker is a linear sliding type and is led out to the outside of the outer shell container as in the above embodiment, compared to the case where the rotary type operation shaft is led out airtightly to the outside, the lead-out part of the operation shaft is The structure of can be simplified.

[Brief explanation of the drawing]

FIG. 1 is a top view showing an embodiment of the present invention, and FIG. 2 is a top view showing an embodiment of the present invention.
Fig. 3 is a cross-sectional view of the container in the outer shell container of the same embodiment, and Fig. 4 is a top view of another embodiment of the present invention. 5 and 6 are sectional views showing a modification of the cable head unit, and FIG. 7 shows the electrical configuration of the embodiment shown in FIGS. 1 to 3. Figure 8 is a single line diagram showing the electrical configuration of the embodiment shown in Figure 5. 1... Controller unit, 101... Controller box, 10
5... Operating device for circuit breaker, 106.107... Operating device for grounding device, 2... Main unit 1~. 201... Outer shell container, 202... Equipment support plate, 215... Branch conductor, 217... Current transformer conductor, CB... Circuit breaker, ESl
l and ES12...first and second circuit breaker inspection grounding devices, 3Δ and 3B...first and second busbar units, [3S1°BS2...busbar, DSll and DS12
...First and second 5lII side disconnectors, 4...Cable head unit 1-1CH...Cable head, [
Δ...Earth protection device, DS2...Track side disconnector. Figure 8

Claims (4)

[Claims] (1) A main unit consisting of circuit breakers for at least three phases housed in an outer shell container, and a three-phase line-side disconnector housed in a cable head container having an opening opening in the horizontal direction. A four-digit cable that accommodates a three-phase cable head that is connected to equipment in the main unit via the line-side disconnector, and has an insulating spacer for connecting the main unit in the horizontal opening. a head unit, and the horizontal frontage of the cable head container is horizontally connected to the device connection opening provided in the outer shell container of the main unit via the insulating spacer. In the device, the couple head is vertically attached to a lid plate that closes a portion between the F ends of the cable head container, and the track side disconnector is disposed above the cable head, and the track side disconnector is disposed above the cable head, The gas insulated switchgear is characterized in that an instrument voltage transformer is included and the voltage transformer is electrically connected to the main unit side terminal or the cable head side terminal of the line side disconnector. Device. (2) The line-side disconnector is characterized in that its single moving contact and fixed contact are provided horizontally opposite to the main connecting insulating spacer. A gas insulated switchgear according to claim 1. (3) The voltage transformer is housed in an independent container, and the voltage transformer is connected to the upper end of the cable head container through an insulating spacer for installing the voltage transformer. A gas insulated switchgear according to claim 1 or 2. (4) The gas insulated switchgear according to any one of claims 1 to 3, wherein the voltage transformer is housed in an upper part of the cable head container.