GB2593072A

GB2593072A - Gas insulation switchgear

Info

Publication number: GB2593072A
Application number: GB2106008.2A
Authority: GB
Inventors: Matsunaga Toshihiro; Mori Takahiro; Ebato Teruaki
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-11-12
Filing date: 2018-11-12
Publication date: 2021-09-15
Anticipated expiration: 2038-11-12
Also published as: GB2593072B; CN112956092B; JPWO2020100183A1; JP7002675B2; GB202106008D0; WO2020100183A1; CN112956092A

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

DESCRIPTION

GAS INSULATION SWITCHGEAR

TECHNICAL FIELD

[0001] The present disclosure relates to a gas insulation switchgear.

BACKGROUND ART

[0002] In a gas insulation switchgear configured such that a circuit breaker, a disconnector, and the like composing a main circuit are stored in a sealed container together with insulating gas, particularly in the case where the rated current is great, it is important to cool the sealed container. In this regard, there is known a switchgear in which a heat dissipation fin and a fan for blowing air to the heat dissipation fin are provided at the back surface of an airtight container in which a main circuit is stored and insulating gas is sealed, and a control circuit is provided for operating/stopping the fan on the basis of a temperature detected by a temperature sensor mounted at the front surface of the airtight container (for example, Patent Document 1). In this switchgear, when the detected temperature exceeds a set temperature with increase in the applied current, the control circuit operates the fan to cool the airtight container via the heat dissipation fin, thus achieving size reduction of the airtight container and realizing an inexpensive configuration.

[0003] In addition, there is known a switchgear in which a gap for passing air as a cooling medium is provided between a plurality of sealed containers in a housing, to suppress temperature increase in the housing (for example, Patent Document 2).

CITATION LIST

PATENT DOCUMENT

[0004] Patent Document 1: Japanese Laid-Open Patent Publication No. 2002-325317 Patent Document 2: Japanese Laid-Open Patent Publication No. 10-94120

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[00051 In the switchgear in Patent Document 1, outside air is taken in through a vent hole in the front surface of the switchgear, and is passed through a cable connection portion to the heat dissipation fin by the fan at the back surface. In recent years, since a cable connection portion can also be a short-circuit fault point, international regulations (regulations established by International Electrotechnical Commission (IEC)) and the like require that the area around the cable connection portion is also formed as a closed compartment for ensuring safety at the time of an internal arc fault, and therefore the area where the cable connection portion is present cannot be utilized as an air flow path.

[0006] One example that solves the above problem is the switchgear in Patent Document 2, in which the gap between the sealed containers through which air outside the housing passes as a cooling medium is used as the air flow path. Meanwhile, it is desired to provide a pressure 10 release duct for releasing, to the outside, a pressure increased due to an internal arc occurring at the time of a fault in an airtight container chamber and a cable chamber, and thus the layout in the housing is restricted.

[0007] The present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a highly reliable gas insulation switchgear having a pressure release duct and configured such that a main circuit chamber storing a main circuit device composing a main circuit and for opening/closing the main circuit is cooled without an air flow path passing through a cable chamber.

SOLUTION TO THE PROBLEMS

[0008] A gas insulation switchgear according to the present disclosure includes: a main circuit chamber which 25 stores a main circuit device for opening/closing a main circuit and in which insulating gas is sealed; a bus chamber provided above the main circuit chamber and storing a bus; a cable chamber provided under the main circuit chamber and storing a cable; a low-voltage control chamber provided in front of the bus chamber and storing at least a control device for controlling the main circuit device; and a pressure release duct for releasing a pressure of the main circuit chamber and a pressure of the cable chamber via a flapper, wherein the main circuit chamber, the bus chamber, the cable chamber, the low-voltage control chamber, and the pressure release duct are arranged so as to be divided into respective compartments in a housing. A width of the main circuit chamber is smaller than a width of the housing. A first opening having a fan is provided at a front lower part of the main circuit chamber, and a second opening is provided at a front upper part of the main circuit chamber. An air flow path is provided through which air is introduced from the first opening directly or via the low-voltage control chamber toward the main circuit chamber, passes along a side surface part of the main circuit chamber, and is discharged from the second opening directly or via the low-voltage control chamber.

EFFECT OF THE INVENTION

[0009] The gas insulation switchgear according to the present disclosure makes it possible to provide a highly reliable gas insulation switchgear having a pressure release duct and configured such that a main circuit chamber storing a main circuit device can be efficiently cooled without an air flow path passing through a cable chamber.

BRIEF DESCRIPTION OF THE DRAWINGS

[0010] [FIG. 1] FIG. 1 is a side view showing the structure of a gas insulation switchgear according to 10 embodiment 1.

[FIG. 2] FIG. 2 shows the structure of the gas insulation switchgear according to embodiment 1 and is a front sectional view show-J.1-1g a main circuit chamber. [FIG. 3] FIG. 3 is a front view showing a main 15 circuit chamber in another gas insulation switchgear according to embodiment 1.

[FIG. 4] FIG. 4 is a front view showing a main circuit chamber in still another gas insulation switchgear according to embodiment 1.

[FIG. 5] FIG. 5 shows the structure of a gas insulation switchgear according to embodiment 2 and is a front view showing a main circuit chamber.

[FIG. 6] FIG. 6 is a side view showing the structure of a gas insulation switchgear according to 25 embodiment 3.

[FIG. 7] FIG. 7 is a side view showing the structure of a gas insulation switchgear according to embodiment 4.

[FIG. 8] FIG. 8 is a front view showing the 5 structure of a gas insulation switchgear according to embodiment 5, and shows a plurality of housings arranged in parallel.

DESCRIPTION OF EMBODIMENTS

[0011] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, the same reference characters denote the same or corresponding parts.

[0012] Embodiment 1 Hereinafter, a gas insulation switchgear according 15 to embodiment 1 will be described with reference to FIG. 1 and FIG. 2.

FIG. 1 is a right side view showing the structure of the gas insulation switchgear according to embodiment 1. In the drawing, a gas insulation switchgear 1 has, inside a housing 2, a plurality of compartments which are divided into a main circuit chamber 10, a bus chamber 20, a cable chamber 30, a low-voltage control chamber 40, and a pressure release duct 60.

[0013] The main circuit chamber 10 is formed as an airtight container in which insulating gas is sealed and which stores a circuit breaker, a disconnector, and the like (not shown) which are main circuit devices composing a main circuit and for opening/closing the main circuit. The bus chamber 20 storing buses 21 is provided above the main circuit chamber 10, and one end of a conductor portion (not shown) of the main circuit is connected to the buses 21 via bushings 14. Across an area under the main circuit chamber 10 and a rearward lower area, the cable chamber 30 is provided which stores a cable 31 connected to the other end of the conductor portion of the main circuit via a bushing 13.

[0014] The pressure release duct 60 is provided in a compartment rearward of the main circuit chamber 10. When a fault occurs in the main circuit chamber 10 or the cable chamber 30, an internal arc occurs. The pressure release duct 60 is for releasing the increased pressure due to the internal arc to the outside. At an upper part of the cable chamber 30 on the pressure release duct 60 side, a flapper 61 is provided for releasing the increased pressure due to the internal arc to the pressure release duct 60 side. The flapper 61 is closed during normal usage, and therefore the cable chamber 30 itself is a closed compartment. in addition, at a rear part of the main circuit chamber 10, a flapper 62 is provide for releasing the increased pressure due to the internal arc in the main circuit chamber 10 to the pressure release duct 60 side when a fault has occurred. The flapper 62 is provided so as to communicate with the main circuit chamber 10 and is closed during normal usage so that the increased pressure due to the internal arc is not released into the main circuit chamber 10. Further, a flapper 63 is provided at an upper part of the pressure release duct 60, so that the increased pressure in the pressure release duct 60 can be released to the outside. During a normal state, the pressure release duct 60 is a closed space.

[0015] At the front side adjacent to the main circuit chamber 10, the low-voltage control chamber 40 which stores at least a control device for controlling open/close driving of the main circuit devices and the like, is provided. The low-voltage control chamber 40 can be divided into a first low-voltage control chamber (hereinafter, referred to as control chamber) 50 which stores the control device for controlling open/close driving of the main circuit devices and the like, and a second low-voltage control chamber (hereinafter, referred to as driving unit chamber) 45 which stores a driving unit for performing open/close driving of the circuit breaker and the disconnector which are the main circuit devices.

The driving unit chamber 45 is provided in front of 25 the main circuit chamber 10, and the driving unit chamber 45 and a space between a side surface of the main circuit chamber 10 and the housing 2 communicate with each other via a first opening 16 provided at a front lower part of the main circuit chamber 10. A fan 18 is provided to the first opening 16, and a first vent hole 71 communicating with the outside of the gas insulation switchgear 1 is provided in a front part of the driving unit chamber 45 at a position opposed to the first opening 16. The control chamber 50 is provided at a position frontward of the main circuit chamber 10 and upward of the driving unit chamber 45, i.e., at a front side of the bus chamber 20, and the control chamber 50 and a space between the main circuit chamber 10 and the housing 2 communicate with each other via a second opening 17 provided at a front upper part of the main circuit chamber 10. A second vent hole 72 communicating with the outside is provided in a front part of the control chamber 50 at a position opposed to the second opening 17.

The driving unit chamber 45 and the control chamber 50 correspond to, in terms of voltage, a low-voltage control chamber having a mechanism unit, a circuit, and the like that operate at lower voltages as compared to voltages applied to the cable chamber 30, the main circuit chamber 10, and the bus chamber 20.

[0016] The main circuit chamber 10 has a space between itself and the housing 2 at the side surface part, and with this structure, air is introduced from the front side of the housing 2 toward the main circuit chamber 10, thereby cooling the side surface part of the main circuit chamber 10. That is, outside air is taken into the driving unit chamber 45 from the outside of the gas insulation switchgear 1 via the first vent hole 71, and then 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 to the control chamber 50 via the second opening 17. The air discharged from the main circuit chamber 10 side is discharged to the outside of the gas insulation switchgear 1 through the second vent hole 72.

[0017] Cooling fins 15 are provided at both side surfaces of the main circuit chamber 10, and a thermoelectric element 19 is provided at an upper part of the side surface of the main circuit chamber 10. The air introduced from the outside rises along the cooling fin 15 as indicated by arrows in the drawing, so that the main circuit chamber 10 can be efficiently cooled by the rising air flow. The thermoelectric element 19 with its temperature increased performs power generating operation at a temperature not higher than a permissible temperature of the main circuit, and thus the fan 18 provided at the first opening 16 is driven by the power from the thermoelectric element 19.

The reason why the thermoelectric element 19 is provided at an upper part of the side surface of the main circuit chamber 10 is that, since heated gas in the main circuit chamber 10 moves upward, the side surface of the main circuit chamber 10 has a higher temperature at an upper part, and in addition, the temperature at the upper part of the main circuit chamber 10 readily increases due to electromagnetic induction when the bushings 14 are energized.

[0018] FIG. 2 is a front sectional view showing the structure of the gas insulation switchgear 1 as seen in A-A direction in FIG. 1. The internal parts of the bus chamber 20 and the cable chamber 30 are not shown. In the drawing, the width of the main circuit chamber 10 is smaller than the width of the housing 2. Therefore, as described above, there are gaps between the housing 2 and both side surfaces of the main circuit chamber 10, and the cooling fins 15 at both side surfaces of the main circuit chamber 10 are provided in these gaps. The air introduced toward the main circuit chamber 10 by the fans 18 of the first openings 16 rises at the side surfaces of the main circuit chamber 10 along the cooling fins 15 as indicated by arrows in the drawing, and is discharged from the second openings 17. A part of the air after passing through the cooling fins 15 collides with the lower surface of the bus chamber 20, thus also contributing to cooling of the bus chamber 20.

[0019] As described above, in the present embodiment 1, the main circuit chamber 10 separated and partitioned from the cable chamber 30 is provided above the cable chamber 30, and air is introduced from the front side of the main circuit 5 chamber 10, i.e., the front side of the housing 2, passes along both side surfaces of the main circuit chamber 10 to cool the main circuit chamber 10, and then is discharged from the front side of the main circuit chamber 10, i.e., the front side of the housing 2 again. Thus, the main circuit chamber 10 can be efficiently cooled. Further, since the path of air (air flow path) does not pass through the cable chamber 30, it becomes possible to provide a highly reliable gas insulation switchgear that can ensure an air flow path in consideration of safety that conforms to the international regulations. In addition, owing to such a cooling air flow path that introduces air from the front side of the main circuit chamber 10 and discharges the air to the front side, it is possible to provide the pressure release duct 60 at the rear of the main circuit chamber 10.

[0020] In addition, since the fan 18 is provided to the first opening 16, the cooling efficiency for the main circuit chamber 10 can be improved, and further, the fan 18 is operated by the thermoelectric element 19 which generates power at a temperature not higher than a permissible temperature of the main circuit devices, whereby a power supply for the fan 18 is not needed. Thus, heat due to conduction loss in the main circuit devices is utilized for cooling and also the main circuit devices can be protected from the heat. Further, since the main circuit chamber 10 can be cooled, the main circuit chamber 10 can be downsized, leading to cost reduction of the gas insulation switchgear 1.

[0021] In the case where the driving unit chamber 45 is large and the control chamber 50 is small, the second vent hole 72 may be provided at an upper part of the driving unit 10 chamber 45 side so as to be opposed to the second opening 17.

[0022] In FIG. 2 described above, the example in which the cooling fins 15 are provided at both side surfaces of the main circuit chamber 10, has been shown. However, in the case where the width of the main circuit chamber 10 and the width of the housing 2 are close to each other so that gaps cannot be ensured sufficiently between the housing 2 and both side surfaces of the main circuit chamber 10, as shown in FIG. 3, the cooling fin 15 may be provided only at one side surface, and the first openings 16 and the second openings 17 may be provided at both side-surface sides so that air flow paths are formed at both side-surface sides including the gap at the other side surface. Alternatively, as shown in FIG. 4, the cooling fin 15 may be provided only at one side surface of the main circuit chamber 10. As a matter of course, the cooling efficiency is maximized when the cooling fins 15 are provided at both side surfaces of the main circuit chamber 10.

[0023] Embodiment 2 Hereinafter, a gas insulation switchgear according 5 to embodiment 2 will be described with reference to FIG. 5. FIG. 5 is a front view showing the structure of the gas insulation switchgear according to embodiment 2, and in the drawing, the low-voltage control chamber 40 (45, 50) in front of the main circuit chamber 10 is not shown so that 10 arrangement of the main circuit chamber 10 can be seen, and the internal parts of the bus chamber 20 and the cable chamber 30 are also not shown. Embodiment 2 shows an example in which a gap is also provided at the front part of the main circuit chamber 10, between the main circuit chamber 10 and the low-voltage control chamber 40, and cooling fins are provided at not only the side surfaces of the main circuit chamber 10 but also the front surface thereof. In the drawing, air introduced from the first openings 16 rises along the cooling fins 15 provided at the side surfaces of the main circuit chamber 10, and rises along a cooling fin 15a provided at the front surface of the main circuit chamber 10 as indicated by arrows in the drawing, and then the air is discharged from the second openings 17. As in embodiment 1, the fans 18 are provided to the first openings 16, and the fans 18 can be driven by power from the thermoelectric element 19. Besides, the bus chamber 20 is provided above the main circuit chamber 10, the cable chamber 30 is provided across an area under the main circuit chamber 10 and a rearward lower area, the pressure release duct 60 is provided at the rear side, and the driving unit chamber 45 and the control chamber 50 are provided at the front side. Such structures are the same as in embodiment 1 and therefore the description thereof is omitted.

[0024] As described above, in the present embodiment 2, as in embodiment 1, since the path of air (air flow path) for cooling the main circuit chamber 10 does not pass through the cable chamber 30, it becomes possible to provide a highly reliable gas insulation switchgear that can ensure an air flow path in consideration of safety that conforms to the international regulations. In addition, owing to such a cooling air flow path that introduces air from the front side of the main circuit chamber 10 and discharges the air to the front side, it is possible to provide the pressure release duct 60 at the rear of the main circuit chamber 10.

[0025] Further, the main circuit chamber 10 separated and partitioned from the cable chamber 30 is provided above the cable chamber 30, and air is introduced from the front side of the main circuit chamber 10, i.e., the front side of the housing 2, passes along both side surfaces and the front surface of the main circuit chamber 10 to cool the main circuit chamber 10, and then is discharged from the front side of the main circuit chamber 10, i.e., the front side of the housing 2 again. Thus, the main circuit chamber 10 can be cooled with higher efficiency than in embodiment 1. In particular, as shown in FIG. 3 and FIG. 4 in embodiment 1, in the case where a cooling fin can be provided at only one side surface of the main circuit chamber 10 or in the case where an air flow path can be provided at only one side surface, it is desirable to provide a cooling fin at the front surface and form an air flow path so as to improve the cooling efficiency.

In actuality, the driving unit for driving the main circuit devices is connected to the front part of the main circuit chamber 10 and therefore the area is limited, but it is obvious that providing the cooling fin there improves the cooling efficiency.

[0026] Embodiment 3 Hereinafter, a gas insulation switchgear according to embodiment 3 will be described with reference to FIG. 6.

FIG. 6 is a side view showing the structure of the gas insulation switchgear according to embodiment 3. In the drawing, a driving unit 41 for performing open/close driving of the circuit breaker and the disconnector which are the main circuit devices in the main circuit chamber 10 is connected to the front part of the main circuit chamber 10, and the driving unit chamber and the main circuit chamber 10 are integrated with each other. The driving unit 41 is connected via a flange and the like (not shown), so that the airtightness of the main circuit chamber 10 is kept even when the main circuit devices are driven to be opened/closed. Air directly introduced from the first opening 16 in front of the main circuit chamber 10 rises along the cooling fin 15 and then is discharged from the second vent hole 72 of the control chamber 50 via the second opening 17.

[0027] The second opening 17 that also serves as the second vent hole 72 may be provided at a front upper part of the main circuit chamber 10 and thus air rising along the cooling fin 15 may be directly discharged not via the control chamber 50.

[0028] As described above, in the present embodiment 3, as in embodiment 1, the main circuit chamber 10 can be efficiently cooled, and since the path of air (air flow path) for cooling the main circuit chamber 10 does not pass through the cable chamber 30, it becomes possible to provide a highly reliable gas insulation switchgear that can ensure an air flow path in consideration of safety that conforms to the international regulations. In addition, owing to such a cooling air flow path that introduces air from the front side of the main circuit chamber 10 and discharges the air to the front side, it is possible to provide the pressure release duct 60 at the rear of the main circuit chamber 10.

[0029] In addition, in a manner similar to embodiment 2, a cooling fin can be provided at a part where the driving unit 41 is not connected, on the front surface of the main circuit chamber 10. Alternatively, a cooling fin may be provided at a side surface of the driving unit 41 near the connection part with the main circuit chamber 10, whereby the cooling efficiency for the main circuit chamber 10 can be improved.

[0030] Embodiment 4 Hereinafter, a gas insulation switchgear according to embodiment 4 will be described with reference to FIG. 7.

FIG. 7 is a side view showing the structure of the gas insulation switchgear according to embodiment 4. The driving unit chamber 45 and the control chamber 50 correspond to, in terms of voltage, a low-voltage control chamber having a mechanism unit, a circuit, and the like that operate at lower voltages as compared to voltages applied to the cable chamber 30, the main circuit chamber 10, and the bus chamber 20. Therefore, the driving unit chamber 45 and the control chamber 50 can be integrated without being separated from each other, and formed as one low-voltage control chamber 40. In the drawing, the control chamber is provided in front of the main circuit chamber 10, and in the control chamber, a driving unit (not shown) is provided at a position corresponding to the main circuit device in the main circuit chamber 10, and a control device (not shown) is provided at the upper side thereof so as to be attached to a rack, for example. The first vent hole 71 for introducing air from the outside and the second vent hole 72 for discharging air having circulated along the side surface part of the main circuit chamber 10 are both provided in a front part of the low-voltage control chamber 40.

[0031] As described above, in the present embodiment 4, as in embodiment 1, the main circuit chamber 10 can be efficiently cooled, and since the path of air (air flow path) for cooling the main circuit chamber 10 does not pass through the cable chamber 30, it becomes possible to provide a highly reliable gas insulation switchgear that can ensure an air flow path in consideration of safety that conforms to the international regulations. In addition, owing to such a cooling air flow path that introduces air from the front side of the main circuit chamber 10 and discharges the air to the front side, it is possible to provide the pressure release duct 60 at the rear of the main circuit chamber 10.

[0032] In the present embodiment, as in embodiment 2, a cooling fin may be provided at the front surface of the main circuit chamber 10, whereby the cooling efficiency for the main circuit chamber 10 can be improved.

[0033] Embodiment 5 Hereinafter, a gas insulation switchgear according to embodiment 5 will be described with reference to FIG. 8.

FIG. 8 is a front view showing the structure of a gas insulation switchgear 100 according to embodiment 5, and in the drawing, the low-voltage control chamber 40 (45, 50) in front of the main circuit chamber 10 is not shown so that arrangement of the main circuit chamber 10 can be seen. A plurality of the housings 2 of the gas insulation switchgears shown in any of embodiments 1 to 4 are arranged in parallel in a row. In the drawing, between the bus chambers 20 of the adjacent housings 2, the buses 21 are connected via a bus connection portion 22. A reinforcing member 80 is provided between side surface parts of the main circuit chambers 10 of the adjacent housings 2, thereby increasing the strength against open/close driving of the main circuit devices in the main circuit chambers 10, and contributing to cooling of the side surface parts of the main circuit chambers 10. The reinforcing member 80 is made of iron or stainless steel, and the thermal conductivity thereof is not high as metal but is higher as compared to air, and therefore contributes to cooling of the side surface parts of the main circuit chambers 10.

In FIG. 8, the example in which three housings 2 are arranged has been shown, but two housings 2 or more than three housings 2 may be arranged.

[0034] As described above, the present embodiment 5 provides the same effects as in embodiments 1 to 4. Further, in the gas insulation switchgear 100, a plurality of the housings 2 of the gas insulation switchgears shown in any of embodiments 1 to 4 are arranged laterally in a row, and the reinforcing members 80 are provided between the main circuit chambers 10 of the adjacent housings 2, thereby improving the strength of the main circuit chamber 10 of each housing 2 and contributing to cooling of the side surface parts of the main circuit chambers 10.

As shown in FIG. 3 and FIG. 4 in embodiment 1, in the case where an air flow path can be provided at only one side surface of the main circuit chamber 10 or in the case where the cooling fin 15 can be provided at only one side surface of the main circuit chamber 10, it is possible to improve the cooling efficiency for the main circuit chamber 10 by cooling the main circuit chamber 10 from the side surfaces of the housing 2 as in the present embodiment.

[0035] Although the disclosure is described above in terms of various exemplary embodiments and implementations, it should be understood that the various features, aspects, and functionality described in one or more of the individual embodiments are not limited in their applicability to the particular embodiment with which they are described, but instead can be applied, alone or in various combinations to

one or more of the embodiments of the disclosure.

It is therefore understood that numerous modifications which have not been exemplified can be devised without departing from the scope of the present disclosure. For example, at least one of the constituent components may be modified, added, or eliminated. At least one of the constituent components mentioned in at least one of the preferred embodiments may be selected and combined with the constituent components mentioned in another preferred embodiment.

DESCRIPTION OF THE REFERENCE CHARACTERS

[0036] 1, 100 gas insulation switchgear 2 housing main circuit chamber 13, 14 bushing 15, 15a cooling fin 16 first opening 17 second opening 18 fan 19 thermoelectric element bus chamber 21 bus 22 bus connection portion 30 cable chamber 31 cable low-voltage control chamber 41 driving unit driving unit chamber (first low-voltage control chamber) 50 control chamber (second low-voltage control chamber) pressure release duct 61, 62, 63 flapper 71 first vent hole 72 second vent hole reinforcing member

Claims

CLAIMS[1] A gas insulation switchgear comprising: a main circuit chamber which stores a main circuit device for opening/closing a main circuit and in which insulating gas is sealed; a bus chamber provided above the main circuit chamber and storing a bus; a cable chamber provided under the main circuit chamber and storing a cable; a low-voltage control chamber provided in front of the bus chamber and storing at least a control device for controlling the main circuit device; and a pressure release duct for releasing a pressure of the main circuit chamber and a pressure of the cable chamber 15 via a flapper, wherein the main circuit chamber, the bus chamber, the cable chamber, the low-voltage control chamber, and the pressure release duct are arranged so as to be divided into respective compartments in a housing, a width of the main circuit chamber is smaller than a width of the housing, a first opening having a fan is provided at a front lower part of the main circuit chamber, and a second opening is provided at a front upper part of the main circuit chamber, and an air flow path is provided through which air is introduced from the first opening directly or via the low-voltage control chamber toward the main circuit chamber, passes along a side surface part of the main circuit chamber, and is discharged from the second opening directly or via the low-voltage control chamber.[2] The gas insulation switchgear according to claim 1, wherein a cooling fin is provided at the side surface part of the main circuit chamber.[3] The gas insulation switchgear according to claim 2, wherein a cooling fin is further provided at a front surface part of the main circuit chamber.[4] The gas insulation switchgear according to any one of claims 1 to 3, wherein the pressure release duct is provided at a rear of the main circuit chamber.[5] The gas insulation switchgear according to any one of claims 1 to 4, wherein a thermoelectric element is provided at an upper part of the side surface part of the main circuit chamber, and the fan is driven by power from the thermoelectric element.[6] The gas insulation switchgear according to any one of claims 1 to 5, wherein a driving unit for performing open/close driving of the main circuit device is connected to a front part of the main circuit chamber, and an air flow path is provided through which air is introduced from the first opening provided at a front lower part of the driving unit toward the main circuit chamber, passes along the side surface part of the main circuit chamber, and is discharged from the second opening directly or via the low-voltage control chamber.[7] The gas insulation switchgear according to any one of claims 1 to 5, wherein the low-voltage control chamber includes a first low-voltage control chamber storing a driving unit for performing open/close driving of the main circuit device, and a second low-voltage control chamber storing the control device, the first low-voltage control chamber is provided 25 in front of the main circuit chamber, and an air flow path is provided through which air is introduced from the first opening via the first low-voltage control chamber toward the main circuit chamber, passes along the side surface part of the main circuit chamber, and is discharged from the second opening via the first low-voltage control chamber or the second low-voltage control chamber.[8] The gas insulation switchgear according to any one of claims 1 to 7, wherein a plurality of the housings are arranged laterally, and a reinforcing member is provided at the side surface parts of the main circuit chambers, between the adjacent housings.