JPWO2013186830A1 - Gas insulated switchgear - Google Patents

Abstract

An outlet 1a drawn upward is provided at the upper part of the side surface of one end of a cylindrical circuit breaker tank body arranged with the axis horizontal, and horizontally along the axial direction at the other end of the tank body. A circuit breaker 1 in which a circuit breaker is disposed inside a circuit breaker tank provided with an outlet 1b led out to the center and the energization path is substantially L-shaped, and a bus connected to the circuit breaker 1 through the outlet 1a A gas insulated switchgear including a side device group and a line side device group connected to the circuit breaker 1 through an outlet 1b is provided. As a result, the equipment connected to the circuit breaker 1 can be lowered and the earthquake resistance can be improved.

Description

  The present invention relates to a gas insulated switchgear.

  Conventional gas-insulated switchgear has a configuration in which devices such as instrument current transformers are respectively stacked on two branch outlets provided at the top of a horizontal so-called horizontal circuit breaker. .

  For example, in Patent Document 1, two branch outlets are provided in the upper part of a horizontal circuit breaker, and a disconnect switch, a ground switch, an instrument current transformer, and a bushing are stacked on each branch outlet. .

Japanese Utility Model Publication No. 4-33237

  However, the conventional gas insulated switchgear has a problem that the height of the center of gravity increases as a whole and the earthquake resistance decreases because the devices are integrated and arranged above the circuit breaker.

  The present invention has been made in view of the above, and it is an object of the present invention to provide a gas insulated switchgear capable of reducing the number of devices connected to a circuit breaker and improving earthquake resistance.

  In order to solve the above-described problems and achieve the object, the gas insulated switchgear according to the present invention is drawn upward at the upper part of the side surface of one end of a cylindrical circuit breaker tank body arranged with the axis line horizontal. And a shut-off portion is disposed inside the circuit breaker tank provided with the second lead-out port that is horizontally drawn along the axial direction at the other end of the tank body. A circuit breaker having a substantially L-shaped energization path, a bus-side device group connected to the circuit breaker via the first outlet, and the circuit breaker connected to the circuit breaker via the second outlet. A track-side device group.

  According to the present invention, there is an effect that the equipment connected to the circuit breaker can be lowered and the earthquake resistance can be improved.

1 is a side view of a gas insulated switchgear according to Embodiment 1. FIG. FIG. 2 is a diagram of the gas insulated switchgear according to Embodiment 1 as viewed from the line side. FIG. 3 is a view of the gas insulated switchgear according to Embodiment 1 as viewed from the busbar side. FIG. 4 is a top view of the gas-insulated switchgear according to the first embodiment. FIG. 5 is a single-line connection diagram of the gas-insulated switchgear according to Embodiment 1. FIG. 6 is a diagram showing an internal configuration of the main device in FIG. FIG. 7 is a side view of the gas insulated switchgear according to the second embodiment. FIG. 8 is a diagram of the gas insulated switchgear according to Embodiment 2 as viewed from the line side. FIG. 9 is a view of the gas insulated switchgear according to Embodiment 2 as viewed from the busbar side. FIG. 10 is a top view of the gas-insulated switchgear according to the second embodiment. FIG. 11 is a single line connection diagram of the gas insulated switchgear according to the second embodiment. FIG. 12 is a diagram showing an internal configuration of the main device in FIG. FIG. 13 is a side view of the gas-insulated switchgear according to the third embodiment. FIG. 14 is a diagram of the gas-insulated switchgear according to Embodiment 3 as viewed from the line side. FIG. 15 is a diagram of the gas insulated switchgear according to Embodiment 3 as viewed from the busbar side. FIG. 16 is a top view of the gas-insulated switchgear according to the third embodiment. FIG. 17 is a single-line diagram of a gas insulated switchgear according to Embodiment 3. FIG. 18 is a side view of the gas-insulated switchgear according to the fourth embodiment. FIG. 19 is a view of the gas-insulated switchgear according to Embodiment 4 as viewed from the line side. FIG. 20 is a view of the gas insulated switchgear according to Embodiment 4 as viewed from the busbar side. FIG. 21 is a top view of the gas-insulated switchgear according to the fourth embodiment. FIG. 22 is a single line connection diagram of the gas insulated switchgear according to the fourth embodiment. FIG. 23 is a side view of a conventional gas insulated switchgear. FIG. 24 is a view of a conventional gas insulated switchgear as viewed from the busbar side. FIG. 25 is a view of a conventional gas insulated switchgear as viewed from the line side. FIG. 26 is a diagram showing a part of the energization path in the gas insulated switchgear according to Embodiment 1. FIG. 27 is a diagram showing a part of the energization path in a conventional gas insulated switchgear.

  Embodiments of a gas insulated switchgear according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a side view of a gas-insulated switchgear according to the present embodiment, FIG. 2 is a view of the gas-insulated switchgear according to the present embodiment as viewed from the line side, and FIG. FIG. 4 is a top view of the gas insulated switchgear according to the present embodiment, and FIG. 5 is a single line connection diagram of the gas insulated switchgear according to the present embodiment. 6 is a diagram showing an internal configuration of the main device in FIG. The configuration of the gas insulated switchgear according to the present embodiment will be described below with reference to FIGS.

  The gas insulated switchgear according to the present embodiment is for a circuit breaker 1, a bus-side bushing 6 connected to the circuit breaker 1, and a bus-side instrument arranged between the circuit breaker 1 and the bushing 6. A current transformer 2, a disconnecting switch 4 with a grounding switch connected to the circuit breaker 1, and a line-side measuring instrument current transformer disposed between the circuit breaker 1 and the disconnecting switch 4 with a grounding switch 3, a line-side bushing 7 connected to a disconnecting switch 4 with a grounding switch, and a line-side grounding switch 5 connected between the disconnecting switch 4 with a grounding switch and the bushing 7 It has. Further, this gas insulated switchgear comprises an operating device 10 for the circuit breaker 1, an operating device 8 for the disconnecting switch 4 with a grounding switch, and an operating device 9 for the grounded switch 5 to constitute a gas insulated switchgear. Various devices such as the circuit breaker 1 are mounted on the gantry 30, and the gantry 30 is mounted on the installation surface 40.

  As shown in the illustrated example, the gas-insulated switchgear according to the present embodiment is, for example, a three-phase separation type. For example, devices such as the circuit breaker 1 exist for each phase. Below, a common code | symbol is attached | subjected and demonstrated about three phases, without distinguishing each phase. Further, in FIG. 1, the bushing 6, the current transformer 2 for the instrument, the bushing 7, the grounding switch 5 and the like should be accurately illustrated in a manner inclined toward the front side (see FIGS. 2 to 4). However, such description is omitted for the sake of simplicity (the same applies to FIGS. 7, 13, and 18 described later).

  The circuit breaker 1 has a substantially L shape. The tank of the circuit breaker 1 (the circuit breaker tank) has a cylindrical tank body that is arranged with its axis horizontal and extends in the horizontal direction, and an outlet that is drawn upward at the upper part of one side of the tank body. 1a (first outlet) and an outlet 1b (second outlet) that is drawn horizontally along the axial direction coaxially with the tank body at the other end of the tank body. . In correspondence with the L shape, the outlet 1a constitutes one side of the L shape, and the portion between the outlets 1a and 1b and the outlet 1b of the tank main body constitute the other side of the L shape. Inside the circuit breaker 1, a circuit breaker 1c is provided. A conductor 35a extending vertically through the outlet 1a is connected to the blocking portion 1c, and a conductor 35b extending horizontally through the outlet 1b is connected (FIG. 6). The conductor 35a, the interruption | blocking part 1c, and the conductor 35b comprise the electricity supply path | route in the circuit breaker 1, and this electricity supply path | route is also a substantially L shape. That is, in the circuit breaker 1, since the energization path including the circuit breaker 1c is substantially L-shaped, the tank shape is also substantially L-shaped as described above. An insulating gas such as sulfur hexafluoride gas is sealed in the circuit breaker 1. For example, the operating device 10 is arranged on the side where the outlet 1a is provided. In the operating device 10, the part below the axis of the tank body of the circuit breaker 1 is larger than the upper part, and the center of gravity is located below the axis. The operating device 10 is used for opening and closing the blocking unit 1c.

  A bus-side current transformer 2 (first current transformer) is connected to the outlet 1 a of the circuit breaker 1. That is, the instrument current transformer 2 is arranged on the upper part of the circuit breaker 1. The instrument current transformer 2 is configured to include an annular coil that circulates around the conductor 35a, and measures the current flowing through the conductor 35a. A bus-side bushing 6 (first bushing) is connected to the upper part of the instrument current transformer 2 and is arranged on the upper part of the instrument current transformer 2. The bushing 6 is connected to a main bus (not shown). The instrument current transformer 2 and the bushing 6 constitute a busbar side device group.

  In FIG. 1, an L-shaped energization path 45 is shown overlapping the current transformer 2 for the instrument, the outlet 1 a, and the circuit breaker 1.

  The line-side instrument current transformer 3 (second instrument current transformer) is connected to the outlet 1b of the circuit breaker 1. That is, the instrument current transformer 3 is horizontally connected to the circuit breaker 1 at substantially the same height as the tank body of the circuit breaker 1, and is disposed horizontally on the circuit breaker 1. The measuring instrument current transformer 3 includes an annular coil that circulates around the conductor 35b, and measures the current flowing through the conductor 35b. Further, a disconnecting switch 4 with a ground switch is connected to the current transformer 3 on the side opposite to the side to which the circuit breaker 1 is connected. In other words, the disconnect switch 4 with the ground switch is placed laterally with respect to the current transformer 3 for the instrument.

  The disconnect switch 4 with a ground switch is configured such that a ground switch for grounding a circuit breaker and a disconnect switch main body are integrally formed. The disconnect switch 4 with a ground switch enables operation of two devices, the ground switch for grounding the circuit breaker and the disconnect switch main body, with a single operating device 8. When these two devices are configured separately, an operation device for operating each of them is required, whereas in this embodiment, the number of operation devices can be reduced by one. . In the disconnecting switch 4 with a grounding switch, the operation of the operating device 8 can turn on and off the disconnecting switch body and turn on and off the grounding switch for grounding the breaker. The on / off of the disconnector main body and the on / off of the earthing switch for grounding the circuit breaker can be realized, for example, by operating a movable contact that operates in the vertical (vertical) direction.

  A line-side bushing 7 (second bushing) is connected to the upper part of the disconnecting switch 4 with a ground switch. The bushing 7 is connected to a power transmission line (not shown). Further, a ground switch 5 for grounding on the line side is disposed at a height position between the disconnecting switch 4 with the ground switch and the bushing 7. The ground switch 5 is used for grounding a transmission line (not shown). The current transformer 3 for an instrument, the disconnect switch 4 with a ground switch, the ground switch 5 and the bushing 7 constitute a line side device group.

  As described above, in this embodiment, the circuit breaker 1 is substantially L-shaped, and the current transformer 3 and the grounding switch are attached to the outlet 1b drawn along the horizontal axis of the tank body of the circuit breaker 1. The disconnectors 4 are sequentially connected, and these are arranged horizontally with respect to the circuit breaker 1, thereby lowering the arrangement of the devices.

  Further, the unit length A of the gas insulated switchgear can be made equal to, for example, the unit height B or more than the unit height B according to the low-layer arrangement of the equipment (see FIGS. 1 and 2). Here, the unit length A is the length of the gas insulated switchgear in the horizontal axis direction of the tank body of the circuit breaker 1.

  Next, for comparison with the configuration of the present embodiment, a configuration example of a conventional gas insulated switchgear will be described. FIG. 23 is a side view of a conventional gas-insulated switchgear, FIG. 24 is a view of the conventional gas-insulated switchgear from the bus side, and FIG. 25 is a view of the conventional gas-insulated switchgear from the line side. FIG.

  A conventional gas-insulated switchgear is connected to a so-called horizontal breaker 101 arranged with its axis horizontal, and one branch outlet provided on the upper side of one end of the breaker 101. The bus-side instrument current transformer 102 arranged on the bus-side, the bus-side bushing 106 connected to the upper part of the instrument current transformer 102, and the other provided on the upper side of the other end of the circuit breaker 101. A line-side instrument current transformer 103 connected to the branch outlet and disposed above the circuit breaker 1, a connection tank 150 connected to the upper part of the instrument current transformer 103, and a horizontal connection to the connection tank 150 The disconnector 112, the earthing switch 113 for grounding the breaker connected to the lower part of the disconnector 112, the connection tank 151 connected horizontally to the disconnector 112, and the lower part of the connection tank 151 Grounding for track side grounding And 閉器 105, and a bushing 107 connected line-side to the top of the connecting tank 151. Further, this conventional gas-insulated switchgear includes an operating device 110 for the circuit breaker 101, an operating device 115 for the disconnect switch 112, an operating device 114 for the ground switch 113, and an operating device 109 for the ground switch 105. Various devices such as the circuit breaker 101 constituting the conventional gas-insulated switchgear are mounted on the mount 130, and the mount 130 is mounted on the installation surface 40.

  In this conventional gas-insulated switchgear, an instrument current transformer 102 and a bushing 106 are stacked on the circuit breaker 101, and an instrument current transformer 103 and a connection tank 150 are also stacked. That is, the current transformer 103 and the connection tank 150 are connected to the upper part of the circuit breaker 101 not only on the bus side but also on the line side, and thereby the disconnector 112 and the connection tank 151 connected to the connection tank 150. Is disposed above the circuit breaker 101. Therefore, in the conventional gas insulated switchgear, the device arrangement is increased as a whole, and the height of the center of gravity is higher than that of the present embodiment.

  In this conventional gas insulated switchgear, the instrument current transformer 103 is connected to the connection tank 150 via a flange. In this case, the instrument current transformer 103 is connected between the tank and the connection tank 150. It is necessary to connect to an insulating material such as a horizontal spacer. This is because if a current induced by a conductor (not shown) arranged in these tanks flows between these tanks, it leads to an error in measuring the current flowing through the conductor by the current transformer 103 for the instrument. This is to ensure measurement accuracy by the instrumental current transformer 103 by insulatingly mounting the tank of the instrumental current transformer 103 and the connection tank 150.

  On the other hand, in the present embodiment, the instrument current transformer 3 is connected horizontally to the circuit breaker 1, and the disconnector 4 with a ground switch is connected horizontally to the instrument current transformer 3. Therefore, it is possible to reduce the number of connection tanks, and it is not necessary to insulate the instrument current transformer 3 from the connection tank, and there is no need to provide a horizontal spacer.

  FIG. 26 shows a part of the energization path in the gas insulated switchgear according to the present embodiment. In detail, the bushing 6, the instrument current transformer 2, the circuit breaker 1, and the instrument current transformer are shown. An approximately L-shaped energization path 45 is shown for the device 3. On the other hand, in FIG. 27, a part of the energization path in the conventional gas-insulated switchgear is indicated by an arrow. Specifically, the bushing 106, the instrument current transformer 102, the circuit breaker 101, and the instrument current transformer 103 are shown. Is a schematic U-shaped energization path.

  As described above, according to the present embodiment, by making the circuit breaker 1 substantially L-shaped, it is possible to realize a low-layer arrangement of devices connected to the circuit breaker 1 and to improve earthquake resistance. it can.

  Further, in this embodiment, there is no need to insulate the current transformer 103 and the connection tank 150 from each other as in the conventional gas insulated switchgear. This eliminates the need for a connection tank, reduces the number of parts, simplifies the fastening structure, and reduces the number of horizontal spacers used. In addition, when a metal foreign substance mixes in the tank, there is a risk of creeping flashing in the horizontal spacer, so it is more preferable that the number of horizontal spacers used is small.

  Further, in the present embodiment, since the disconnecting switch 4 with a grounding switch is used, the number of operation devices installed is reduced as compared with the case where the grounding switch for grounding the breaker is configured separately. The exterior is simplified. In addition, the disconnect switch 4 with a ground switch can use the type whose movable part operates to the up-down direction (vertical operation | movement), for example.

Embodiment 2. FIG.
FIG. 7 is a side view of the gas-insulated switchgear according to the present embodiment, FIG. 8 is a view of the gas-insulated switchgear according to the present embodiment as viewed from the line side, and FIG. FIG. 10 is a top view of the gas-insulated switchgear according to the present embodiment, and FIG. 11 is a single-line connection diagram of the gas-insulated switchgear according to the present embodiment. 12 is a diagram showing an internal configuration of the main device in FIG. 7-12, the same code | symbol is attached | subjected to the component same as FIGS. 1-6. Below, with reference to FIGS. 7-12, it demonstrates mainly focusing on difference with Embodiment 1. FIG.

  The substantially L-shaped circuit breaker 1 is the same as that of the first embodiment. The bus-side current transformer 2 (first current transformer) is connected to the outlet 1a (first outlet) of the circuit breaker 1, and the line side is connected to the upper part of the current transformer 2 The bushing 6 (first bushing) is connected in the same manner as in the first embodiment.

  On the other hand, in the present embodiment, the connection structure of the line side equipment is different from that of the first embodiment, and the disconnecting switch 4 with a grounding switch is connected to the outlet 1b (second branch outlet) of the circuit breaker 1. The line-side instrument current transformer 11 (second instrument current transformer) is connected to the upper part of the disconnecting switch 4 with a ground switch. In this way, the disconnect switch 4 with the ground switch is disposed laterally with respect to the circuit breaker 1. Further, a line-side bushing 7 (second bushing) is connected immediately above the instrument current transformer 11. The line-side grounding switch 5 is arranged at a height below the instrument current transformer 11.

  As described above, in this embodiment, the circuit breaker 1 is substantially L-shaped, and the disconnecting switch 4 with a grounding switch is connected to the outlet 1b drawn along the horizontal axis of the tank body of the circuit breaker 1. The disconnecting switch 4 with the earthing switch is arranged side by side with respect to the circuit breaker 1, and the current transformer 11 for the instrument is arranged above the disconnecting switch 4 with the earthing switch. Thereby, compared with the structure of the conventional gas insulated switchgear shown in FIGS. 23-25, the arrangement | positioning of the arrangement | positioning of the apparatus connected to the circuit breaker 1 is implement | achieved, and earthquake resistance can be improved.

  Further, in the present embodiment, the instrument current transformer 11 is disposed immediately below the bushing 7. Since the bushing 7 includes an insulator that is an insulator, it is possible to suppress an induced current that may flow through the tank of the current transformer 11 for an instrument. As described in the first embodiment, in the conventional gas-insulated switchgear, in order to ensure the measurement accuracy of the instrument current transformer 103, a horizontal is provided between the tank of the instrument current transformer 103 and the connection tank 150. Although it is necessary to connect via an insulator such as a spacer, in this embodiment, since the bushing 7 serves as an insulator, there is no need to separately provide an insulator such as a connection tank and a horizontal spacer. This eliminates the need for a connection tank, reduces the number of parts, simplifies the fastening structure, and reduces the number of horizontal spacers used.

  In the first embodiment, since the instrument current transformer 3 is connected adjacent to the circuit breaker 1, a combination of the current transformer 2 with the instrument current transformer 2 causes a flashing accident or the like in the circuit breaker 1. Can occur, it can be specified that it has actually occurred in the circuit breaker 1. On the other hand, in this embodiment, since the circuit breaker 1 and the disconnecting switch 4 with a ground switch are also arranged between the current transformer 11 and the current transformer 2, an accident occurs. Although it is difficult to determine whether the generation position is in the circuit breaker 1 using the measured values of the current transformers 11 and 2, the low-layer arrangement of the equipment and simplification of the insulation mounting, etc. Has the effect described. Other configurations and operational effects of the present embodiment are the same as those of the first embodiment.

Embodiment 3 FIG.
13 is a side view of the gas-insulated switchgear according to the present embodiment, FIG. 14 is a view of the gas-insulated switchgear according to the present embodiment as viewed from the line side, and FIG. FIG. 16 is a top view of the gas insulated switchgear according to the present embodiment, and FIG. 17 is a single line connection diagram of the gas insulated switchgear according to the present embodiment. It is. 13 to 17, the same components as those in FIGS. 1 to 5 are denoted by the same reference numerals. Below, with reference to FIGS. 13-17, it demonstrates mainly focusing on difference with Embodiment 1. FIG.

  In the first embodiment, the disconnecting switch 4 with the ground switch is connected to the current transformer 3 for the measuring instrument at substantially the same height. In the present embodiment, the disconnector 12 is connected to the instrument current transformer 3 at substantially the same height, and the disconnector 12 is connected to a ground switch 13 for grounding the breaker. That is, in this embodiment, the ground switch 13 is configured separately from the disconnect switch 12. Therefore, an operating device 14 for the disconnect switch 12 is provided, and an operating device 15 for the ground switch 13 is also provided.

  In the present embodiment, except for the fact that the disconnecting switch 12 and the ground switch 13 are provided separately, and the operating device 14 and the operating device 15 are provided separately according to this, the other configurations and operational effects are as follows. This is the same as in the first embodiment.

Embodiment 4 FIG.
18 is a side view of the gas-insulated switchgear according to the present embodiment, FIG. 19 is a view of the gas-insulated switchgear according to the present embodiment as viewed from the line side, and FIG. 20 is a diagram of the present embodiment. FIG. 21 is a top view of the gas insulated switchgear according to the present embodiment, and FIG. 22 is a single line connection diagram of the gas insulated switchgear according to the present embodiment. It is. 18 to 22, the same components as those in FIGS. 7 to 11 are denoted by the same reference numerals. Below, with reference to FIGS. 18-22, it demonstrates mainly focusing on difference with Embodiment 2. FIG.

  In the second embodiment, the breaker 4 with a ground switch is connected to the circuit breaker 1 at substantially the same height. In the present embodiment, a disconnect switch 12 is connected to the circuit breaker 1 at substantially the same height, and a ground switch 13 for grounding the circuit breaker is connected to the disconnect switch 12. That is, in this embodiment, the ground switch 13 is configured separately from the disconnect switch 12. Therefore, an operating device 14 for the disconnect switch 12 is provided, and an operating device 15 for the ground switch 13 is also provided.

  In the present embodiment, except for the fact that the disconnecting switch 12 and the ground switch 13 are provided separately, and the operating device 14 and the operating device 15 are provided separately according to this, the other configurations and operational effects are as follows. This is the same as in the second embodiment.

  In addition to the first to fourth embodiments, generally, the above-described substantially L-shaped circuit breaker 1 is provided, and the bus side device group is connected to the outlet 1a, and the line side device group is connected to the outlet 1b. With this configuration, at least the device directly connected to the outlet 1b is disposed at substantially the same height as the circuit breaker 1, so when compared with the conventional gas insulated switchgear described above, Lowering of the arrangement is realized and the earthquake resistance can be improved.

  As described above, the present invention is useful as a gas insulated switchgear.

DESCRIPTION OF SYMBOLS 1,101 Circuit breaker 1a, 1b Outlet 1c Breaking part 2,3,11,102,103 Current transformer 4 Instrument disconnecting switch 5,13,105,113 Grounding switch 6,7,106 , 107 Bushing 8, 9, 10, 14, 15, 109, 110, 114, 115 Operating device 12, 112 Disconnector 30, 130 Base 35a, 35b Conductor 40 Installation surface 45 Current path 150, 151 Connection tank

Claims (5)

A first outlet port is provided at the upper part of the side surface of one end of a cylindrical circuit breaker tank body arranged with the axis horizontal, and the other end of the tank body extends along the axial direction. A circuit breaker in which a circuit breaker is disposed in a circuit breaker tank provided with a second outlet drawn horizontally and the energization path is substantially L-shaped,
A bus-side device group connected to the circuit breaker via the first outlet;
A line-side device group connected to the circuit breaker via the second outlet;
A gas insulated switchgear characterized by comprising: The busbar side device group includes a first instrument current transformer connected to the first outlet and disposed above the circuit breaker, and a first instrument current transformer connected to the first instrument current transformer. A first bushing disposed on top of one instrument current transformer,
The line side device group is connected to the second instrument current transformer connected to the second outlet and disposed laterally with respect to the circuit breaker. And a disconnector disposed laterally with respect to the second instrument current transformer, and a second bushing connected to the disconnector and disposed above the disconnector. The gas insulated switchgear according to claim 1. The busbar side device group includes a first instrument current transformer connected to the first outlet and disposed above the circuit breaker, and a first instrument current transformer connected to the first instrument current transformer. A first bushing disposed on top of one instrument current transformer,
The line-side equipment group includes a disconnector connected to the second outlet and disposed laterally with respect to the circuit breaker, and a second connected to the disconnector and disposed above the disconnector. And a second bushing connected to the second current transformer and disposed immediately above the current transformer. Gas insulated switchgear.   The gas insulated switchgear according to claim 2 or 3, wherein a length of the gas insulated switchgear in the axial direction is equal to or greater than a height of the gas insulated switchgear. The line-side device group includes a grounding switch for grounding a circuit breaker and a grounding switch for grounding a transmission line connected to the second bushing,
The gas-insulated switchgear according to claim 2 or 3, wherein the disconnector is configured such that a disconnector body and a grounding switch for grounding the breaker are integrally formed.

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