WO2020100183A1

WO2020100183A1 - Gas insulation switchgear

Info

Publication number: WO2020100183A1
Application number: PCT/JP2018/041796
Authority: WO
Inventors: 敏宏松永; 隆広森; 輝明江波戸
Original assignee: 三菱電機株式会社
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2020-05-22
Also published as: GB2593072B; CN112956092B; JPWO2020100183A1; JP7002675B2; GB202106008D0; CN112956092A; GB2593072A

Abstract

A gas insulation switchgear (1), in which are installed so as to be divided into respective compartments inside a housing (2):a main circuit compartment (10) in which a main circuit apparatus is accommodated and an insulating gas is sealed; a bus compartment (20) disposed above the main circuit compartment (10) and in which a bus (21) is accommodated; a cable compartment (30) disposed below the main circuit compartment (10) and in which a cable (31) is accommodated; a low voltage control compartment (45) disposed in front of the bus compartment (20) and in which at least a control apparatus is accommodated; and a pressure discharge duct (60) in which are opened pressure from the main circuit compartment (10) and pressure from the cable compartment (30), wherein a ventilation path is provided for introducing air from a front lower section of the main circuit compartment (10) directly or through the low voltage control compartment (45) in the direction of the main circuit compartment (10), and for discharging air from a front upper section of the main circuit compartment (10) through a side surface section of the main circuit compartment (10) directly or through the low voltage control compartment (45).

Description

Gas insulated switchgear

The present application relates to a gas insulated switchgear.

 Cooling of the closed container is important for a gas-insulated switchgear in which a circuit breaker, disconnector, etc. that compose the main circuit are housed together with an insulating gas in a closed container, especially if the rated current is large. On the other hand, a heat radiation fin and a fan that ventilates the heat radiation fin are provided on the back surface of the airtight container that houses the main circuit and is filled with an insulating gas, and the temperature detected by the temperature sensor mounted on the surface of the airtight container is also detected. A switchgear including a control circuit for operating and stopping a fan is known (for example, Patent Document 1). In this switchgear, the control circuit operates the fan when the detected temperature exceeds the set temperature due to the increase of the energizing current, and the airtight container is cooled through the radiation fins to reduce the size of the airtight container. It enables various configurations.

Also, there is known a switchgear that suppresses a temperature rise in the housing by providing a gap for passing air serving as a cooling medium between a plurality of closed containers in the housing (for example, Patent Document 2).

JP, 2002-325317, A Japanese Patent Laid-Open No. 10-94120

In the switchgear of Patent Document 1, outside air is taken in through the ventilation opening on the front of the switchgear, and is ventilated to the radiating fins by the fan on the back via the connection part of the cable. In recent years, since the cable connection part can also become a short-circuit accident point, the area around the cable connection part has been closed in order to ensure safety in case of internal arc accident, according to international standards (IEC: Standards established by International Electrotechnical Commission) etc. It is prohibited to do so, and it cannot be used as a ventilation path where there is a cable connection part.

An example of solving this problem is the switchgear of Patent Document 2, in which a gap between the closed containers, through which air outside the housing serving as a cooling medium flows, is used as an air flow path.
On the other hand, there is a demand for the installation of a pressure release duct that releases the pressure increased by the internal arc generated in the airtight container chamber and the cable chamber due to the internal arc at the time of the accident, and the layout inside the housing is limited.

The present application discloses a technique for solving the above-mentioned problems, and cools a main circuit room that houses a main circuit device that forms a main circuit and has a ventilation circuit that opens and closes the main circuit without passing through the cable room. It is also an object of the present invention to provide a highly reliable gas-insulated switchgear having a pressure relief duct.

The gas-insulated switchgear disclosed in the present application accommodates a main circuit device that opens and closes a main circuit, and a main circuit chamber in which an insulating gas is sealed, and is arranged above the main circuit chamber, and a bus bar is accommodated. A bus room, a cable room that is arranged below the main circuit room and stores cables, a low voltage control room that is arranged in front of the bus room and that stores at least a control device that controls the main circuit device, and A gas-insulated switchgear in which pressure release ducts for releasing the pressure in the main circuit chamber and the pressure in the cable chamber via a flapper are arranged in compartments in the housing, respectively. Has a width smaller than that of the housing, and has a first opening having a fan at a lower front portion of the main circuit chamber and a second opening at an upper front portion thereof, and allows air to flow directly from the first opening or to the first opening. A ventilation path is provided that is introduced in the direction of the main circuit chamber through the low voltage control chamber and is discharged through the side surface of the main circuit chamber directly from the second opening or through the low voltage control chamber. It is a thing.

According to the gas insulated switchgear disclosed in the present application, it is possible to efficiently cool the main circuit room accommodating the main circuit device without the ventilation path passing through the cable room, and to provide a highly reliable gas having a pressure release duct. It is possible to provide an insulating switchgear.

It is a side view which shows the structure of the gas insulated switchgear which concerns on Embodiment 1. It is a figure which shows the structure of the gas insulated switchgear which concerns on Embodiment 1, and is a front sectional view which shows a main circuit chamber. It is a front view which shows the main circuit room of another gas insulated switchgear which concerns on Embodiment 1. It is a front view which shows the main circuit room of another gas-insulated switchgear which concerns on Embodiment 1. It is a figure which shows the structure of the gas insulated switchgear which concerns on Embodiment 2, and is a front view which shows a main circuit room. It is a side view which shows the structure of the gas insulated switchgear which concerns on Embodiment 3. It is a side view which shows the structure of the gas insulated switchgear which concerns on Embodiment 4. It is a front view which shows the structure of the gas insulated switchgear which concerns on Embodiment 5, and shows several housings in parallel.

The following describes this embodiment with reference to the drawings. In the drawings, the same reference numerals denote the same or corresponding parts.

Embodiment 1.
Hereinafter, the gas insulated switchgear according to the first embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a right side view showing the configuration of the gas insulated switchgear according to the first embodiment. In the figure, a gas-insulated switchgear 1 has a plurality of compartments inside a housing 2, and is divided into a main circuit room 10, a bus room 20, a cable room 30, a low-voltage control room 40, and a pressure release duct 60. ..

The main circuit room 10 is a hermetically sealed container in which an insulating gas is sealed, in which a circuit breaker, a disconnector and the like (not shown), which are main circuit devices that constitute the main circuit and open and close the main circuit, are housed. A busbar chamber 20 accommodating a busbar 21 is arranged above the main circuit chamber 10, and one end of a conductor portion (not shown) of the main circuit is connected to the busbar 21 via a bushing 14. A cable chamber 30 accommodating a cable 31 connected to the other end of the conductor portion of the main circuit via the bushing 13 is arranged below the main circuit chamber 10 and below the rear portion.

A pressure relief duct 60 is installed in a compartment behind the main circuit room 10. When an accident occurs in the main circuit room 10 or the cable room 30, an internal arc is generated, and the pressure release duct 60 is for releasing the pressure increase due to the internal arc to the outside. A flapper 61 is provided at an upper portion of the cable chamber 30 on the pressure release duct 60 side to open a pressure increase due to the internal arc to the pressure release duct 60 side. Since the flapper 61 is normally closed, the cable chamber 30 itself is a closed compartment. A flapper 62 is provided at the rear of the main circuit room 10 to open the pressure increase due to the internal arc in the main circuit room 10 to the pressure release duct 60 side when an accident occurs. The flapper 62 is provided so as to communicate with the main circuit chamber 10 and is closed during normal use, so that the pressure increase due to the internal arc is not released into the main circuit chamber 10. Further, a flapper 63 is provided on the upper portion of the pressure release duct 60 so that the pressure increase in the pressure release duct 60 can be released to the outside. Normally, the pressure release duct 60 is a closed space.

A low-voltage control chamber 40 accommodating at least a control device for controlling opening / closing driving of the main circuit device is arranged in front of and adjacent to the main circuit chamber 10. The low-voltage control room 40 includes a first low-voltage control room (hereinafter referred to as a control room) 50 in which a control device that controls opening / closing driving of the main circuit device is housed, and a circuit breaker that is the main circuit device. It can be divided into a second low-voltage control chamber (hereinafter, referred to as a drive unit chamber) 45 in which a drive unit for opening / closing the disconnector is housed.
A drive unit chamber 45 is disposed in front of the main circuit chamber 10, and a space between the side surface of the main circuit chamber 10 and the housing 2 and the drive unit chamber 45 is provided by the first opening 16 provided in the lower front portion of the main circuit chamber 10. And are in communication. A fan 18 is provided in the first opening 16, and a first ventilation port 71 communicating with the outside of the gas-insulated switchgear 1 is provided in a position facing the first opening 16 in front of the drive chamber 45. It is provided. Further, a control chamber 50 is arranged in front of the main circuit room 10 and above the drive chamber 45, that is, in front of the bus room 20, and the main opening is provided by the second opening 17 provided in the upper front part of the main circuit room 10. The space between the circuit room 10 and the housing 2 communicates with the control room 50. A second ventilation port 72 communicating with the outside is provided at a position in front of the control chamber 50 and facing the second opening 17.
The drive chamber 45 and the control chamber 50 are provided with a mechanism unit and a circuit that operate at a voltage lower than the voltage applied to the cable chamber 30, the main circuit chamber 10 and the bus chamber 20 in terms of voltage. It is a low voltage control room.

The main circuit room 10 has a space between it and the housing 2 on the side surface portion. With this configuration, air is introduced from the front of the housing 2 toward the main circuit room 10 and the side surface portion of the main circuit room 10 is opened. Cooling. That is, outside air is taken into the drive chamber 45 from the outside of the gas insulated switchgear 1 through the first ventilation port 71, and is further introduced to the main circuit chamber 10 side by the fan 18 of the first opening 16. The introduced air rises along the side surface of the main circuit chamber 10 and is discharged into the control chamber 50 through the second opening 17. The air discharged from the main circuit room 10 side is discharged to the outside of the gas insulated switchgear 1 through the second ventilation port 72.

Cooling fins 15 are provided on both side surfaces of the main circuit room 10, and thermoelectric elements 19 are provided on upper side surfaces of the main circuit room 10. Since the air introduced from the outside rises along the cooling fins 15 as shown by the arrow in the figure, the rising airflow can efficiently cool the main circuit chamber 10. Further, the thermoelectric element 19 is operated to generate electric power at a temperature which is raised and is equal to or lower than the allowable temperature of the main circuit, and the electric power of the thermoelectric element 19 drives the fan 18 provided in the first opening 16.
The thermoelectric element 19 is provided on the upper portion of the side surface of the main circuit chamber 10 because the heated gas in the main circuit chamber 10 moves to the upper portion, so that the side surface of the main circuit chamber 10 has a higher temperature in the upper portion and the temperature of the main circuit chamber 10 is higher. This is because the upper portion is likely to be heated by electromagnetic induction when the bushing 14 is energized.

FIG. 2 is a front sectional view showing the configuration of the gas-insulated switchgear 1 viewed from the AA direction in FIG. The interiors of the bus room 20 and the cable room 30 are omitted. In the figure, the width of the main circuit chamber 10 is smaller than the width of the housing 2. Therefore, as described above, there is a gap between the housing 2 and both side faces of the main circuit chamber 10, and the cooling fins 15 on both side faces of the main circuit chamber 10 are arranged in this gap. The air introduced in the direction of the main circuit chamber 10 by the fan 18 of the first opening 16 rises along the cooling fins 15 along the side surface of the main circuit chamber 10 as indicated by the arrow in the figure, and the second opening It is discharged from 17. A part of the air that has passed through the cooling fins 15 collides with the lower surface of the busbar chamber 20 and also contributes to cooling the busbar chamber 20.

As described above, in the first embodiment, the main circuit room 10 that is separated and partitioned from the cable room 30 is disposed above the cable room 30, and the air is supplied from the front of the main circuit room 10, that is, the front of the housing 2. The main circuit room 10 is cooled by cooling the main circuit room 10 by passing through both side surfaces of the main circuit room 10 and again discharging air from the front side of the main circuit room 10, that is, the front side of the housing 2. Can be cooled efficiently. Further, since the air path (ventilation path) does not pass through the cable chamber 30, it is possible to provide a highly reliable gas-insulated switchgear capable of ensuring the ventilation path in consideration of safety according to international standards. Further, the pressure release duct 60 can be provided at the rear of the main circuit chamber 10 by such a ventilation passage for introducing air from the front of the main circuit chamber 10 and discharging the air to the front.

Further, since the fan 18 is provided in the first opening portion 16, it is possible to improve the cooling efficiency of the main circuit room 10, and further, the thermoelectric element 19 that generates power from the fan 18 at a temperature below the allowable temperature of the main circuit device. The power supply for the fan 18 becomes unnecessary by operating the above. This makes it possible to utilize the heat generated by the conduction loss of the main circuit device for cooling and protect the main circuit device from this heat. Further, if the main circuit room 10 can be cooled, the main circuit room 10 can be reduced in size, leading to cost reduction of the gas insulated switchgear 1.

When the drive chamber 45 is large and the control chamber 50 is small, the second ventilation port 72 may be provided on the upper side of the drive chamber 45 so as to face the second opening 17.

In FIG. 2 described above, an example in which the cooling fins 15 are provided on both side surfaces of the main circuit room 10 is shown. However, when the width of the main circuit room 10 and the width of the housing 2 are close to each other and a sufficient gap cannot be secured between both side surfaces of the main circuit room 10 and the housing 2, as shown in FIG. The first opening 16 and the second opening 17 may be provided on only one side surface, and the first opening portion 16 and the second opening portion 17 may be provided on both side surfaces so that both side surfaces, including the gaps on the other side surface, serve as ventilation paths. Further, as shown in FIG. 4, the cooling fins 15 may be provided only on one side surface of the main circuit chamber 10. It goes without saying that the cooling efficiency is highest when the cooling fins 15 are provided on both side surfaces of the main circuit chamber 10.

Embodiment 2.
The gas insulated switchgear according to the second embodiment will be described below with reference to FIG.
FIG. 5 is a front view showing the configuration of the gas-insulated switchgear according to the second embodiment, and the low-voltage control chamber 40 (45, 50) is omitted, and the insides of the bus room 20 and the cable room 30 are also omitted. In the second embodiment, an example is shown in which a gap is provided in front of the main circuit room 10 also with the low voltage control chamber 40, and cooling fins are provided not only on the side surface of the main circuit room 10 but also on the front surface. In the figure, the air introduced from the first opening 16 rises along the cooling fins 15 provided on the side surface of the main circuit chamber 10 and is provided on the front surface of the main circuit chamber 10 as indicated by the arrow in the figure. The cooling fins 15a are lifted up and discharged from the second opening 17. As in the first embodiment, a fan 18 can be provided in the first opening 16 and the fan 18 can be driven by the electric power of the thermoelectric element 19. In addition, a bus room 20 is provided above the main circuit room 10, a cable room 30 is provided below and below the rear, a pressure release duct 60 is provided at the rear, and a drive room 45 and a control room 50 are provided at the front. Since the configuration and the like are the same as those in the first embodiment, the description thereof will be omitted.

As described above, in the second embodiment, as in the first embodiment, the air path (ventilation path) for cooling the main circuit room 10 does not pass through the cable room 30, so that the safety according to the international standard is ensured. Therefore, it is possible to provide a highly reliable gas-insulated switchgear capable of ensuring a ventilation path in consideration of the above. Moreover, the pressure release duct 60 can be provided in the rear part of the main circuit chamber 10 by such a cooling ventilation path that introduces air from the front of the main circuit chamber 10 and discharges the air to the front.

Further, the main circuit room 10 which is separated from the cable room 30 and is partitioned is disposed above the cable room 30, and air is introduced from the front of the main circuit room 10, that is, the front of the housing 2 to remove the main circuit room 10. Since the main circuit room 10 is cooled by passing through both side surfaces and the front surface and air is discharged again from the front side of the main circuit room 10, that is, the front side of the housing 2, the main circuit room 10 is made smaller than in the first embodiment. It can be cooled with higher efficiency. In particular, when the cooling fins are provided only on one side surface of the main circuit chamber 10 as shown in FIGS. 3 and 4 of the first embodiment, or when the ventilation path is provided only on one side surface, the front surface is provided. It is desirable to arrange cooling fins in the above and to provide a ventilation path to improve cooling efficiency.
It should be noted that in practice, the front part of the main circuit room 10 is connected to the drive part for driving the main circuit device, so the range is limited, but the cooling efficiency is not improved by disposing the cooling fins. it is obvious.

Embodiment 3.
Hereinafter, the gas insulated switchgear according to the third embodiment will be described with reference to FIG.
FIG. 6 is a side view showing the configuration of the gas insulated switchgear according to the third embodiment. In the figure, a drive unit 41 for opening and closing a circuit breaker and a disconnector, which are main circuit devices in the main circuit room 10, is connected to a front portion of the main circuit room 10, and the drive unit room and the main circuit room 10 are connected to each other. It is integrated. The drive unit 41 is connected via a flange or the like (not shown), and the airtightness of the main circuit chamber 10 is maintained even when the main circuit device is opened and closed. The air introduced directly from the first opening 16 in the front of the main circuit room 10 rises along the cooling fins 15 and from the second ventilation port 72 of the control room 50 through the second opening 17. Is discharged.

In addition, the second opening 17 which also serves as the second ventilation port 72 is provided in the upper front part of the main circuit room 10, and the air rising along the cooling fins 15 is directly discharged without passing through the control room 50. Good.

As described above, in the third embodiment, as in the first embodiment, the main circuit room 10 can be efficiently cooled, and the air path (ventilation path) for cooling the main circuit room 10 is a cable. Since it does not pass through the chamber 30, it is possible to provide a highly reliable gas-insulated switchgear capable of ensuring a ventilation path in consideration of safety in accordance with international standards. Further, the pressure release duct 60 can be provided at the rear of the main circuit chamber 10 by such a ventilation passage for introducing air from the front of the main circuit chamber 10 and discharging the air to the front.

In addition, the cooling fins may be provided on the front surface of the main circuit chamber 10 which is not connected to the drive section 41, as in the second embodiment. Alternatively, it is also possible to improve the cooling efficiency of the main circuit chamber 10 by providing it on the side surface of the drive unit 41 near the connecting portion with the main circuit chamber 10.

Fourth Embodiment
Hereinafter, the gas insulated switchgear according to the fourth embodiment will be described with reference to FIG. 7.
FIG. 7 is a side view showing the configuration of the gas insulated switchgear according to the fourth embodiment. In terms of voltage, the drive unit chamber 45 and the control chamber 50 include a mechanism unit and a circuit that operate at a voltage lower than the voltage applied to the cable chamber 30, the main circuit chamber 10, and the busbar chamber 20. Since it is a control room, it can be integrated into one low-voltage control room 40 without being divided. In the figure, a control room is arranged in front of the main circuit room 10, a drive section is arranged in a position corresponding to the main circuit equipment in the main circuit room 10 (not shown), and is mounted above it, for example, in a rack. A control device (not shown) is arranged in the. Both a first ventilation port 71 for introducing air from the outside and a second ventilation port 72 for discharging air circulated in the side surface portion of the main circuit room 10 are provided in front of the low voltage control chamber 40.

As described above, in the fourth embodiment, as in the first embodiment, the main circuit room 10 can be efficiently cooled, and the air path (ventilation path) for cooling the main circuit room 10 is a cable. Since it does not pass through the chamber 30, it is possible to provide a highly reliable gas-insulated switchgear capable of ensuring a ventilation path in consideration of safety in accordance with international standards. Moreover, the pressure release duct 60 can be provided in the rear part of the main circuit chamber 10 by such a cooling ventilation path that introduces air from the front of the main circuit chamber 10 and discharges the air to the front.

In this embodiment, it is possible to improve the cooling efficiency of the main circuit room 10 by providing a cooling fin on the front surface of the main circuit room 10 as in the second embodiment.

Embodiment 5.
Hereinafter, a gas insulated switchgear according to the fifth embodiment will be described with reference to FIG.
FIG. 8 is a front view showing the configuration of the gas insulated switchgear 100 according to the fifth embodiment, and the low voltage control room 40 (45) in the front part of the main circuit room 10 is shown so that the arrangement of the main circuit room 10 can be seen. , 50) are omitted. A plurality of housings 2 of the gas insulated switchgear shown in any of the first to fourth embodiments are arranged in parallel and arranged in rows. In the figure, the busbar chambers 20 of the adjacent housings 2 are connected to each other by a busbar connecting portion 22. A reinforcing member 80 is disposed between the side surface portions of the main circuit chambers 10 of the adjacent housings 2 to reinforce the strength against the opening / closing drive of the main circuit equipment in the main circuit chamber 10 and the side surface of the main circuit chamber 10. Contributes to the cooling of the part. The reinforcing member 80 is made of iron or stainless steel, and the heat conductivity as a metal is not high, but since it is higher than air, it contributes to cooling the side surface portion of the main circuit chamber 10.
Although FIG. 8 shows an example in which three housings 2 are arranged, the number may be two or three or more.

As described above, the fifth embodiment has the same effects as those of the first to fourth embodiments. Further, the gas-insulated switchgear 100 is configured such that a plurality of housings 2 of the gas-insulated switchgear described in any of the first to fourth embodiments are arranged side by side and arranged in rows, and are reinforced between the main circuit chambers 10 of the adjacent housings 2. Since the member 80 is provided, it is possible to improve the strength of the main circuit chamber 10 of each housing 2 and contribute to the cooling of the side surface portion of the main circuit chamber 10.
As shown in FIGS. 3 and 4 of the first embodiment, the ventilation path can be provided only on one side surface of the main circuit room 10, or the cooling fins 15 are provided only on one side surface of the main circuit room 10. If this is not possible, cooling efficiency of the main circuit chamber 10 can be improved by cooling from the side surface of the housing 2 as in the present embodiment.

Although the present disclosure describes various exemplary embodiments and examples, the various features, aspects, and functions described in one or more of the embodiments are not described in particular embodiments. The present invention is not limited to the application, and can be applied to the embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and at least one component is extracted and combined with the components of other embodiments.

1, 100: Gas insulated switchgear, 2: Housing, 10: Main circuit room, 13, 14: Bushing, 15, 15a: Cooling fin, 16: First opening, 17: Second opening, 18: Fan, 19: Thermoelectric element, 20: Bus bar room, 21: Bus bar, 22: Bus bar connection part, 30: Cable room, 31: Cable, 40: Low voltage control room, 41: Drive part, 45: Drive part room (first Low-voltage control room), 50: control room (second low-voltage control room), 60: pressure release duct, 61, 62, 63: flapper, 71: first ventilation port, 72: second ventilation port , 80: Reinforcement member

Claims

A main circuit room that houses the main circuit equipment that opens and closes the main circuit and that is filled with insulating gas,
A busbar room, which is arranged above the main circuit room and in which a busbar is housed,
A cable chamber, which is arranged below the main circuit chamber and stores cables,
A low-voltage control room arranged in front of the bus room and containing at least a control device for controlling the main circuit device,
And a pressure release duct for releasing the pressure in the main circuit chamber and the pressure in the cable chamber via a flapper, which is a gas-insulated switchgear arranged in each compartment in a compartment,
The width of the main circuit room is smaller than the width of the housing,
The main circuit is provided with a first opening having a fan in the lower front part and a second opening in the upper front part, and air is supplied directly from the first opening or through the low voltage control chamber to the main circuit. A gas-insulated switchgear provided with a ventilation path that is introduced in the direction of the chamber and is discharged from the second opening directly through the side surface of the main circuit chamber or through the low-voltage control chamber.
The gas insulated switchgear according to claim 1, wherein a cooling fin is provided on a side surface of the main circuit room.
The gas insulated switchgear according to claim 2, wherein a cooling fin is further provided on the front surface of the main circuit room.
The gas insulated switchgear according to any one of claims 1 to 3, wherein the pressure release duct is arranged at a rear portion of the main circuit chamber.
The gas-insulated switchgear according to any one of claims 1 to 4, wherein a thermoelectric element is provided above a side surface of the main circuit room, and the fan is driven by electric power generated by the thermoelectric element.
A drive unit for opening and closing the main circuit device is connected to a front portion of the main circuit chamber,
Air is introduced in the direction of the main circuit chamber from the first opening provided in the lower front portion of the drive unit, and passes through the side surface portion of the main circuit chamber directly or from the second opening. The gas-insulated switchgear according to any one of claims 1 to 5, wherein a ventilation path for discharging the gas through the voltage control chamber is provided.
The low-voltage control room includes a first low-voltage control room in which a drive unit that drives the main circuit device to open and close is housed, and a second low-voltage control room in which the control device is housed.
The first low voltage control room is arranged in front of the main circuit room,
Air is introduced in the direction of the main circuit chamber from the first opening through the first low voltage control chamber, and passes through the side surface of the main circuit chamber from the second opening to the first opening. The gas-insulated switchgear according to any one of claims 1 to 5, further comprising a ventilation path for exhausting air through the low-voltage control chamber or the second low-voltage control chamber.
The gas-insulated switchgear according to any one of claims 1 to 7, wherein a plurality of the casings are arranged laterally, and a reinforcing member is provided on a side surface portion of the main circuit chamber between the adjacent casings.