CN215989980U

CN215989980U - Three-phase common-cylinder type gas-insulated metal-enclosed switch cabinet

Info

Publication number: CN215989980U
Application number: CN202122232716.2U
Authority: CN
Inventors: 王东
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2022-03-08
Anticipated expiration: 2031-09-15

Abstract

The utility model discloses a three-phase common-cylinder type gas-insulated metal-enclosed switch cabinet, which comprises a control chamber, an installation part and an integrally hollow channel, wherein the control chamber is arranged from front to back and comprises an operation panel, an operation mechanism and a secondary control loop of the operation mechanism; the installation part is respectively provided with a connecting chamber, a breaker chamber and a three-station switch chamber from bottom to top, and the breaker chamber is a double-cylinder air chamber with two cross orthogonal cylinder structures. The utility model can meet the requirement of wider working air pressure, is suitable for SF6 and other insulating gases, meets the requirements of insulating levels of different voltage grades, and can be combined and optimized to obtain better cost performance and applicability; the heat dissipation efficiency of the air chamber can be improved, the rated current can be increased, and other functions and parameter requirements of the switch cabinet can be met through modular combination, so that the green development from better cost performance to environment-friendly gas insulation is realized while the reliability, safety, standardization and serialization degree of components are improved.

Description

Three-phase common-cylinder type gas-insulated metal-enclosed switch cabinet

Technical Field

The utility model relates to the technical field of metal-enclosed switchgear, in particular to a three-phase common-cylinder type gas-insulated metal-enclosed switchgear.

Background

According to the GB3906 and IEC62271-200 standards, the 3.6KV-52KV switch cabinet is a complete set of equipment which is assembled in factories, verified by type tests, installed indoors or outdoors, contains A, B, C three-phase switch devices and related control, measurement, protection, regulation and intellectualization devices, is combined with related accessories, shells and supporting pieces and is connected with the inside of the supporting pieces; can be divided into the following according to the main insulating medium: air insulated switchgear (AIS for short) using atmospheric air as a main insulating medium, and gas insulated switchgear (C-GIS or gas insulated switchgear for short) using inflation gas (such as sulfur hexafluoride (SF 6 for short) or other gas) as a main insulating medium.

The AIS is large in size and large in occupied area because atmospheric air is used as an insulating medium, and the insulation reliability of the high-voltage electrified body is easily influenced by environmental factors such as atmosphere, altitude, humidity, salt mist, dust and small animals, so that the reliability of long-term operation is influenced by the environment, maintenance, overhaul or replacement is required, the maintenance and overhaul cost is high, and the risk of equipment and personal accidents caused by maintenance and overhaul is increased.

The C-GIS seals primary high-voltage components (such as a circuit breaker or a load switch, a three-position switch and the like), buses and other components and the mutual connection thereof in a gas chamber filled with insulating gas (such as SF6 gas) and is electrically connected with the outside through a sealed sleeve, so that the insulating property of all high-voltage charged bodies is free from environmental influence and maintenance, and the operation reliability is improved; meanwhile, if gas (such as SF6 gas) with better insulation and heat dissipation performance than air is adopted, the structure can be more compact, and the external dimension and the occupied area are both reduced. Therefore, the C-GIS is well applied to the power transformation and distribution fields of high reliability requirements, difficult maintenance, heavy environmental pollution, short space or occupied area, coastal areas, high-altitude areas and the like, and becomes an effective supplement and substitute for AIS.

On the one hand, however, current C-GIS still use primarily SF6 gas, although SF6 is an excellent insulating and quenching gas, but is also a strong equivalent greenhouse gas that limits emissions. According to data published by the united nations, the greenhouse effect of SF6 is 23900 times that of carbon dioxide (CO2), the natural decomposition time in the atmosphere is as long as 3200 years, and the requirements of green energy sources and sustainable development are difficult to meet; moreover, no ideal substitute gas has been found so far, even though the applicability, decomposition products, toxicity and the like of novel gases such as G3, C4, C5 and the like are still to be widely verified, the insulating property is only about 1/3 of SF6 and the heat dissipation performance is poor by using environmental protection gases such as nitrogen, dry air or CO2, and the development of the C-GIS is limited.

On the other hand, the existing C-GIS sealed air chamber is designed based on excellent insulation and heat dissipation performance of SF6, and the working air pressure is slightly positive pressure (namely the inflation pressure in the air chamber is slightly higher than the atmospheric pressure, such as 0.02-0.06MPa relative pressure), so that a box-type air chamber formed by welding stainless steel plates is mainly adopted, which is not beneficial to improving the gas insulation capacity by improving the gas pressure (such as 0.3MPa relative pressure and below), and further improves the difficulty of the development of environment-friendly gas to higher voltage levels (such as 40.5KV and above); the stainless steel plate has poor heat-conducting property, so that the requirement of heat dissipation of the switch cabinet is not facilitated, and the difficulty of development of the C-GIS to a larger current level (such as 2500A and above) is improved; but also is not beneficial to the requirement of vacuum pumping (such as-0.1 MPa) required by factory production and field maintenance and overhaul; the products, different insulating gases, different voltage grades and different current grades of the C-GIS of each manufacturing plant have different structural forms, overall dimensions, installation, operation and maintenance requirements, inconvenience is brought to user design, construction, installation and maintenance, extension and reconstruction, inconvenience is brought to the production of the manufacturing plant, and the standardized and serialized development of the C-GIS is limited.

On the other hand, although a cylindrical sealed air chamber structure is adopted in the C-GIS, or three phases are separated, namely three aluminum cylindrical air chambers are arranged in front and back to form the three-phase C-GIS, or three phases are in the same steel cylinder, not only components (such as a circuit breaker, a three-position switch and the like) are arranged in a three-phase vertical triangle and are dispersedly installed, but also the existing three-phase horizontal arrangement integrated forming mode which is mature is difficult to adopt, and one chamber which is shared by all the components can not be separated, so that the reliability of the switch cabinet is reduced, and when buses among the cabinets are connected in an installation site, the bus air chamber of each switch cabinet needs to be opened, the bus air chamber is sealed after the buses are connected, and gas is processed (vacuumized and filled with insulating gas), so that the bus air chambers of each switch cabinet are not independent but several or all connected, and once one bus air chamber has a problem, the others can be influenced, the installation requirement and cost are improved, and the reliability of the switch cabinet bus is also reduced.

Meanwhile, the switch cabinet is required to have the capability of resisting internal arc combustion within a certain current (usually rated short-circuit breaking current, such as 25KA and 31.5KA) and a certain time (such as 0.5 second or 1 second) so as to ensure the safety of personnel, systems and equipment in case of failure, and when aluminum and aluminum alloy are used as materials of a sealed gas chamber, particularly when three phases are in short circuit, the application is limited due to poor arc resistance.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a three-phase common-cylinder type medium-voltage gas insulation switch cabinet which can work under a wider working air pressure (such as-0.1 MPa-0.3 MPa relative air pressure), thereby being suitable for SF6 and other insulating gases, meeting the insulation level requirements of different voltage grades through combination adjustment of different insulating gases and rated air pressure, and being capable of carrying out combination optimization to obtain better cost performance and applicability; the heat dissipation efficiency of the sealed air chamber can be improved, the rated current can be increased, and the requirements of other functions and parameters of the switch cabinet can be met through modular combination, so that the reliability, the safety, the standardization and the serialization degree of the 3.6KV-52KV C-GIS and the components thereof are improved, and the green development from better cost performance to environment-friendly gas insulation is realized.

In order to solve the above technical problem, a technical solution of the present invention provides a three-phase common-tube type gas-insulated metal-enclosed switchgear, wherein the switchgear includes:

the control room is arranged from front to back and comprises an operation panel, an operation mechanism and a secondary control loop of the operation mechanism, an installation part and a hollow channel which is used for pressure relief and collection and is hollow as a whole;

the mounting part is respectively provided with a connecting chamber, a breaker chamber and a three-position switch chamber from bottom to top, wherein,

the breaker chamber is a double-cylinder air chamber with two cross orthogonal cylinder structures;

the top of the bus of the three-station switch chamber is expanded into a double-cylinder air chamber with a structure of two cross orthogonal cylinder structures or the side of the bus is expanded into a three-cylinder air chamber with a structure of three cross orthogonal cylinder structures.

Optionally, the breaker chamber is a double-cylinder air chamber with two cylinder axes in a cross-orthogonal structure, and a first front sealing plate, a first rear sealing plate, a middle sealing plate shared with the three-position switch chamber, and a lower sealing plate are respectively arranged at a cylinder opening position.

Optionally, install the business turn over line sleeve pipe that is fixed in the bottom down on the shrouding, install in the inner face of first preceding shrouding and with business turn over line bushing's circuit breaker utmost point post, install in being used for of first preceding shrouding outside is operated the first operating device of circuit breaker utmost point post, first back shrouding outside installation first relief valve, just be located down on the shrouding business turn over line sleeve pipe sets up first resistant arc device outward, locates the indoor three-phase of circuit breaker the horizontal word arrangement of circuit breaker utmost point post.

Optionally, the three-position switch chamber is a double-cylinder air chamber with two cylinder axes in a cross-orthogonal structure, and a second front sealing plate, a second rear sealing plate, and the middle sealing plate and the upper sealing plate shared with the breaker chamber are respectively arranged at the cylinder opening positions; the middle seal plate is provided with a connecting sleeve and a second arc-resistant device arranged outside the connecting sleeve, the inner face of the second front seal plate is installed at the front end of the three-position switch, the middle end of the three-position switch is connected with the connecting sleeve through a middle movable contact base, the rear end of the three-position switch is connected with a bus outer taper sleeve through a supporting insulator support arranged on the second rear seal plate, the bus outer taper sleeve is connected with the upper seal plate, a second pressure relief valve is arranged outside the second rear seal plate, the second operation mechanism is used for controlling the three-position switch and is arranged in the three-position switch chamber, and the three phases in the three-position switch chamber are horizontally arranged at the front end, the middle end and the rear end of the three-position switch.

Optionally, the first pressure relief valve, the second pressure relief valve, the connecting chamber are in communication with the passage.

Optionally, the three-position switch chamber is a three-cylinder air chamber with a cross-shaped structure of three cylinder axes, and a second front sealing plate, the middle sealing plate shared with the breaker chamber, and a second rear sealing plate are respectively arranged at cylinder openings; the middle seal plate is provided with a connecting sleeve and a second arc-resistant device arranged outside the connecting sleeve, the inner face of the second front seal plate is installed at the front end of the three-station switch, the middle end of the three-station switch is connected with the connecting sleeve through a middle movable contact base, the rear end of the three-station switch is connected with the supporting insulator bracket installed on the second rear seal plate, the supporting insulator bracket is connected with a bus and an inner taper sleeve in a barrel type air chamber above the three-station switch chamber, a second pressure relief valve is installed outside the second rear seal plate, a second operating mechanism used for controlling the three-station switch is installed outside the second front seal plate and is arranged in the three-station switch chamber, and the front end, the middle end and the rear end of the three-station switch are arranged in a horizontal line.

The technical scheme of the utility model has the beneficial effects that:

the three-phase common-cylinder medium-voltage gas insulation switch cabinet can meet the requirement of wider working air pressure (such as-0.1 MPa-0.3 MPa relative air pressure), is suitable for SF6 and other insulating gases, meets the insulation level requirements of different voltage grades through combination adjustment of different insulating gases and rated air pressure under smaller overall dimensions, and can be combined and optimized to obtain better cost performance and applicability; the heat dissipation efficiency of the air chamber can be improved, the rated current can be increased, and other functions and parameter requirements of the switch cabinet can be met through modular combination, so that the reliability, the safety, the standardization and the serialization degree of the 3.6KV-52KV C-GIS and components thereof are improved, and the green development from better cost performance to environment-friendly gas insulation is realized.

Drawings

Fig. 1 is a schematic structural diagram of a top-extended three-phase common-tube type gas-insulated metal-enclosed switchgear of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the top-extended three-phase common-tube type gas-insulated metal-enclosed switchgear of the present invention;

fig. 3 is a schematic structural view of a top-extended breaker chamber and a three-position switchgear chamber of the present invention;

fig. 4 is a dual barrel perspective view of the top extended breaker chamber and three position switch chamber of the present invention;

FIG. 5 is a schematic structural diagram of a side-extended three-phase common-tube type gas-insulated metal-enclosed switchgear of the present invention;

FIG. 6 is a schematic diagram of the internal structure of the side-extended three-phase common-tube type gas-insulated metal-enclosed switchgear of the present invention;

fig. 7 is a schematic structural view of a side-extended breaker chamber and a three-position switch chamber of the present invention;

fig. 8 is a three-barrel perspective view of the side-extended three-position switch cabinet of the present invention.

The specific implementation mode is as follows:

the utility model is further described with reference to the following drawings and specific examples, which are not intended to be limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

Referring to fig. 1, 2, 3 and 4, a three-phase common-tube type gas-insulated metal enclosed switchgear of an embodiment is shown, wherein the switchgear comprises:

a control chamber 1 which is arranged from front to back and comprises an operation panel, an operation mechanism and a secondary control loop of the operation mechanism, an installation part and a hollow channel 29 which is used for pressure relief and collection and is hollow as a whole;

the mounting part is respectively provided with a connecting chamber 2, a breaker chamber 5 and a three-position switch chamber 3/4 from bottom to top, wherein,

the breaker chamber 5 is a double-cylinder type air chamber with two cross orthogonal cylinder structures;

the three-position switch chamber bus top expansion 3 is a double-cylinder type air chamber (shown in figures 1 and 4) with a structure of two cross orthogonal cylinder type structures, or the bus side expansion 4 is a three-cylinder type air chamber (shown in figures 5 and 8) with a structure of three cross orthogonal cylinder type structures.

In the present embodiment shown in fig. 2 and 3, the breaker chamber 5 is a cylindrical air chamber having two cross-axis cylindrical structures, and a first front sealing plate 13, a first rear sealing plate 15, a middle sealing plate 16 shared with the three-position switch chamber 3, and a lower sealing plate 17 are respectively disposed at the cylindrical opening positions. Install the business turn over line sleeve pipe 19 that is fixed in the bottom on the shrouding 17 down, install in the inboard circuit breaker utmost point post 10 that just is connected with business turn over line sleeve pipe 19 of shrouding 13 before first, install in the first operating device 20 that is used for operating circuit breaker utmost point post 10 of shrouding 13 outside before first, the first relief valve 33 of 15 outside installations of shrouding behind first, on the shrouding 17 down and be located business turn over line sleeve pipe 19 and set up first resistant arc device 21 outward, locate the horizontal in-line arrangement of three-phase circuit breaker utmost point post 10 in the circuit breaker room 5.

In this embodiment, the three-position switch chamber 3 is a double-cylinder air chamber with two cylinder axes cross-orthogonal structures, and a second front closing plate 12, a second rear closing plate 14, a middle closing plate 16 shared with the breaker chamber 5, and an upper closing plate 161 are respectively arranged at the cylinder opening positions; the middle sealing plate 16 is provided with a connecting sleeve 18 and a second arc-resistant device 211 arranged outside the connecting sleeve 18, the inner surface of a second front sealing plate 12 is arranged at the front end of a three-position switch 9, the middle end of the three-position switch 9 is connected with the connecting sleeve 18 through a middle movable contact base 11, the rear end of the three-position switch 9 is connected with a bus outer taper sleeve 23 arranged on the inner surface of an upper sealing plate 161 through a supporting insulator bracket 25 arranged on a second rear sealing plate 14, a second pressure release valve 331 is arranged outside the second rear sealing plate 14, a second operating mechanism 22 for controlling the three-position switch 9 is arranged outside the second front sealing plate 12, and the front end, the middle end and the rear end of the three-phase (including A phase, B phase and C phase) three-position switch 9 arranged in the three-position switch chamber 3 are horizontally arranged in a straight line.

In the present embodiment, the first relief valve 33, the second relief valve 331, and the connection chamber 2 communicate with the passage 29.

As shown in fig. 5, 6, 7 and 8, in the present embodiment, the three-position switch chamber 4 is a three-cylinder air chamber with a cross-shaped cross-axis structure, and a second front closing plate 12, a middle closing plate 16 shared with the breaker chamber 5 and a second rear closing plate 14 are respectively disposed at the cylinder opening positions; the middle sealing plate 16 is provided with a connecting sleeve 18 and a second arc-resistant device 211 arranged outside the connecting sleeve 18, the inner surface of a second front sealing plate 12 is installed at the front end of a three-position switch 9, the middle end of the three-position switch 9 is connected with the connecting sleeve 18 through a middle movable contact base 11, the rear end of the three-position switch 9 is connected with a bus inner cone sleeve 24 installed in an upper cylinder type air chamber 7 of a three-position switch chamber 4 through a supporting insulator bracket 25 arranged on a second rear sealing plate 14, a second pressure release valve 331 is installed outside the second rear sealing plate 14, a second operating mechanism 22 used for controlling the three-position switch 9 is installed outside the second front sealing plate 12, and the front end, the middle end and the rear end of the three-phase (including A phase, B phase and C phase) three-position switch 9 arranged in the three-position switch chamber 4 are horizontally arranged in a straight line.

The features and functions of the present invention will be further understood from the following description.

A three-phase common-tube type medium-voltage gas insulated switchgear is divided into two structures according to the expansion mode of a bus, wherein the first structure is a bus top expansion structure (such as the structures of figures 1-4), and the three-phase common-tube type medium-voltage gas insulated switchgear comprises: a control room 1 comprising an operation panel, an operating mechanism and a secondary control loop, a connecting room (such as a cable, a pipe bus, also called a cable room) 2 positioned at the middle lower part for connecting an inlet wire and an outlet wire, a three-position switch room 3 positioned at the middle upper part and comprising a three-position switch (or and a bus) and sealed in a cylinder type air chamber filled with insulating gas, a breaker room 5 positioned at the middle part and comprising a breaker (or a load switch) and sealed in the cylinder type air chamber filled with insulating gas, a channel 29 positioned at the back for pressure relief and collection, and other compartments; the second is a bus bar side expansion structure (such as the structures of fig. 5-8), which is the same as the first except for the difference of the three-position switch chamber 4 located at the middle upper part.

As shown in fig. 1-8, the three-

position switch chambers

3, 4 are connected with the breaker chamber 5 up and down to form the main loop of the switch cabinet top extension and side extension structure, which can be separated by metal plates, the gas system is independent and adopts modular design, the three-

position switch chambers

3, 4 and the breaker chamber 5 all adopt three-phase common-cylinder structure, that is, A, B, C three phases are in the same cylinder type gas chamber, the cylinder type gas chambers 6, 7, 8 (the internal gas chamber of the top extension three-position switch chamber is the cylinder type gas chamber 6, the internal gas chamber of the side extension three-position switch chamber is the cylinder type gas chamber 7, the internal gas chamber of the breaker chamber is the cylinder type gas chamber 8) adopt two-cylinder or three-cylinder axis cross orthogonal combination structure and are made of aluminum, alloy aluminum or steel, the three-position switch 9 installed in the three-

position switch chambers

3, 4 and the breaker (or load switch) pole 10 installed in the breaker chamber 5 are in the cylinder type gas chamber 6, 6, 7. The A, B, C three-phase horizontal lines in 8 are arranged in a straight line and are respectively connected with the

operating mechanisms

22 and 20 into a whole, and the top extension and the side extension of the bus adopt a plug-in extension connection mode.

As shown in fig. 3 and 4, the cylindrical air chambers 6 and 8 adopt an air chamber structure formed by cross-axis orthogonal combination of two cylinders (such as 400mm, 600mm, 800mm and the like of outer diameter) so that the insulation distance required by the internally mounted three-phase components (such as a three-position switch 9, a breaker pole 10 and the like) and the mutual connection thereof is satisfied under the condition of a smaller cylinder size; in order to realize the expansion of the side surface of the bus, the cylindrical air chamber 7 is additionally provided with an intersected cylinder on the two cylindrical axis cross orthogonal air chambers of the cylindrical air chamber 6, wherein the axis of the intersected cylinder is vertical to a cross orthogonal plane of the axes of the two cylinders to form a three-cylindrical axis cross orthogonal structure for the expansion of the side surface of the bus; the cylindrical air chambers 6, 7 and 8 are made of aluminum, alloy aluminum or steel with good corrosion resistance and heat transfer performance, and the edge pieces can be added to further improve the heat dissipation performance; the front and rear faces of the cylinder type air chambers 6, 7 and 8 can be provided with a first and a second

front closing plates

13 and 12 and a first and a second

rear closing plates

15 and 14 of airtight structures, the cylinder type air chambers 6 and 8 are provided with an upper closing plate 161, a middle closing plate 16 and a lower closing plate 17 of airtight structures, and the upper closing plate 161 of the cylinder type air chamber 8 can be used as a lower closing plate (namely the middle closing plate 16) of the cylinder type air chamber 6; the barrel air chamber 7 only has a sealing plate 16 shared with the barrel air chamber 8; the sealing function of the three-

position switch chambers

3 and 4 and the breaker chamber 5 is formed by the components or the combination of the components, so that the working requirement of the filled insulating gas is met within a certain range (such as-0.1 MPa-0.3 MPa relative pressure) by utilizing the characteristics of large pressure resistance and small mechanical deformation of a cylindrical structure.

The breaker chamber 5 comprises a three-phase breaker pole 10 sealed in a cylinder type air chamber 8, a connecting sleeve 18, a wire inlet and outlet sleeve 19, a pressure release valve 33, insulating gas and the like, and the overall arrangement adopts a front-back and up-down mode to be suitable for the structural characteristics of the cylinder type air chamber, namely, the breaker pole 10 is installed on the inner surface of a first front sealing plate 13 of the cylinder type air chamber 8, the connecting sleeve 18 is positioned above the breaker pole 10 and is used for being directly electrically connected with a three-station switch 9, the wire inlet and outlet sleeve 19 is positioned below the breaker pole 10 and is installed on a lower sealing plate 17 of the cylinder type air chamber 8 and is used for being electrically connected with an external cable, an arrester, a voltage transformer and the like in a plug-pull insulation mode, and the three-phase arrangement realizes A, B, C three-phase common cylinder and horizontal linear arrangement of the breaker pole 10 by utilizing a cross orthogonal structure of the cylinder type air chamber 8; the operating mechanism 20 of the breaker pole 10 is arranged on the outer surface of the first front sealing plate 13 of the cylinder type air chamber 8, and the breaker pole 10 in the cylinder type air chamber 8 is driven in a sealing transmission mode, so that the breaker is integrated into a whole; the first pressure relief valve 33 is arranged on the first rear sealing plate 15 of the cylinder type air chamber 8; a first arc-resistant device 21 is arranged on the upper sealing plate 17 in the cylindrical air chamber 8 and around the wire inlet and outlet sleeve 19, so that the internal arc capacity is improved.

The three-position switch chamber 3 is used for top expansion and comprises a three-phase three-position switch 9 (isolated and grounded), a bus outer taper sleeve 23, a second pressure release valve 331, insulating gas and the like, wherein the three-position switch 9 is sealed in a cylindrical gas chamber 6.

The three-position switch chamber 4 is used for side expansion and comprises a three-phase three-position switch 9 (isolated and grounded), a bus and a bus inner taper sleeve 24, a second pressure release valve 331, insulating gas and the like, wherein the three-position switch 9 is sealed in the cylindrical gas chamber 7.

The overall arrangement adopts a front-back and up-down mode to be suitable for the structural characteristics of the cylinder

type air chambers

3 and 4, namely, the front end (grounding end) of the three-position switch 9 is fixed on the inner surface of a second front sealing plate 12 of the cylinder type air chambers 6 and 7, a middle movable contact base 11 is connected with a breaker pole 10 through a connecting sleeve 18 fixed on a middle sealing plate 16, the rear end is connected with a bus outer cone sleeve 23 in the three-position switch chamber 3, the bus formed by the three-position switch chamber 4 and an inner cone sleeve 24 is connected, and the three-position switch chamber 4 and the inner cone sleeve 24 are fixed in a second rear sealing plate 14 of the cylinder type air chambers 6 and 7 through a supporting insulator and a bracket 25, and the three-phase arrangement realizes three-phase common cylinder and horizontal straight line arrangement by utilizing a cross structure of the cylinder type air chambers 6 and 7; the operating mechanism 22 of the three-position switch 9 is arranged on the outer surface of the second front sealing plate 12 of the cylinder type air chambers 6 and 7, and drives the three-position switch 9 in the air chambers in a sealing transmission mode and integrates the three-position switch into a whole; the second pressure relief valve 33 is mounted on the second rear closing plate 14 of the barrel type air chambers 6 and 7; a second arc-resistant device 211 is mounted on the middle closure plate 16 in the barrel plenum 6, 7, around the adapter sleeve 18, to improve arc-resistance.

The three-

position switch chambers

3, 4 and the breaker chamber 5 can be simplified and combined into a compartment which contains the main circuit of the switch cabinet and is positioned in a cylinder type air chamber of the same sealed air system; the cylinder type air chamber can be an integral structure, and also can be a combination of cylinder type air chambers 6 or 7 and 8 of the three-

position switch chamber

3 or 4 and the breaker chamber 5, and three-position switch and breaker poles are also arranged up and down, arranged in a line and integrated into a whole in the cylinder type air chambers 6, 7 and 8.

The three-position switch chambers 3 and 4 and the breaker chamber 5 are filled with insulating gas, wherein the insulating gas can be SF6, and can also be a plurality of applicable gases such as nitrogen, dry air or other gases and mixed gases; due to the structural characteristics of the cylindrical air chambers 6, 7 and 8, through the gas-solid composite insulation matching and the optimization of the structure and the electric field of the charged component, the insulating gas and the rated inflation pressure thereof can be flexibly selected to meet the insulation requirements of different voltage grades (such as 12KV/SF6/0.1MPa, 12 KV/dry air/0.12 MPa, 12KV/C5/0.12MPa, 40.5KV/SF6/0.12MPa, 40.5KV/N2/0.25MPa and the like), the insulating gas is suitable for various insulating gases (the inflation pressure thereof is generally not more than 0.3MPa (relative pressure)), and the combination optimization can be carried out to obtain better cost performance and applicability; the heat dissipation performance can be improved, the overall dimensions (including the installation dimensions) and the structures of products with different specifications of the C-GIS can be unified or the difference can be reduced as much as possible, the modular design and the specialized production of the cylindrical air chambers 6, 7 and 8 and the built-in components (such as three-position switches, circuit breakers, sleeves and the like) of the cylindrical air chambers 6, 7 and 8 (such as 12KV/1250A, 40.5KV/1250A, 12KV/2500A, 40.5KV/2500A and the like can use the cylindrical air chambers 6, 7 and 8 with the same overall dimensions or the combination thereof) can be formed, the higher rated current (such as 3150A, 4000A and the like) can be easily realized, the reliability, the safety, the standardization and the serialization degree of the C-GIS and the components of the C-GIS can be improved, the cost can be reduced while the green development is realized, and the installation, the use and the maintenance are convenient.

In conclusion, the three-phase common-cylinder medium-voltage gas insulated switchgear can meet the requirement of wider working pressure (such as-0.1 MPa-0.3 MPa relative pressure), is suitable for SF6 and other insulating gases, meets the insulation level requirements of different voltage grades through combination adjustment of different insulating gases and rated pressure under smaller overall dimensions, and can be combined and optimized to obtain better cost performance and applicability; the heat dissipation efficiency of the air chamber can be improved, the rated current can be increased, and other functions and parameter requirements of the switch cabinet can be met through modular combination, so that the reliability, the safety, the standardization and the serialization degree of the 3.6KV-52KV C-GIS and components thereof are improved, and the green development from better cost performance to environment-friendly gas insulation is realized.

While the utility model has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model.

Claims

1. A three-phase common-tube gas-insulated metal-enclosed switchgear, characterized in that it comprises:

2. The three-phase common-tube type gas-insulated metal-enclosed switchgear according to claim 1, wherein the breaker chamber is two double-tube type gas chambers with cross-orthogonal cylindrical axes, and a first front closing plate, a first rear closing plate, and a middle closing plate and a lower closing plate shared with the three-position switch chamber are respectively disposed at the tube opening positions.

3. The three-phase co-barrel type gas-insulated metal-enclosed switchgear according to claim 2, wherein the lower sealing plate is provided with a wire inlet and outlet sleeve fixed at the bottom, a breaker pole connected with the wire inlet and outlet sleeve is installed on the inner surface of the first front sealing plate, a first operating mechanism of the breaker pole is installed outside the first front sealing plate and used for operating, a first pressure relief valve is installed outside the first rear sealing plate, a first arc-resistant device is arranged outside the wire inlet and outlet sleeve on the lower sealing plate and is arranged in the three-phase circuit breaker pole horizontal line.

4. The three-phase common-barrel type gas-insulated metal-enclosed switchgear cabinet according to claim 1, wherein the top of the three-position switch chamber bus is extended into two double-barrel type gas chambers with cross-shaped structures of cylinder axes, and a second front closing plate, a second rear closing plate, the middle closing plate and the upper closing plate which are common to the breaker chamber are respectively arranged at the positions of barrel openings; the middle seal plate is provided with a connecting sleeve and a second arc-resistant device arranged outside the connecting sleeve, the inner face of the second front seal plate is installed at the front end of the three-position switch, the middle end of the three-position switch is connected with the connecting sleeve through a middle movable contact base, the rear end of the three-position switch is connected with a bus outer taper sleeve through a supporting insulator support arranged on the second rear seal plate, the bus outer taper sleeve is connected with the upper seal plate, a second pressure relief valve is arranged outside the second rear seal plate, the second operation mechanism is used for controlling the three-position switch and is arranged in the three-position switch chamber, and the three phases in the three-position switch chamber are horizontally arranged at the front end, the middle end and the rear end of the three-position switch.

5. A three-phase common-tube gas-insulated metal-enclosed switchgear according to claim 4, wherein said first pressure relief valve, said second pressure relief valve, said connection chamber are in communication with said passage.

6. The three-phase common-tube type gas-insulated metal-enclosed switchgear according to claim 1, wherein the three-position switch room bus bar is extended laterally into three-tube type air chambers with cross-orthogonal structure of three cylinder axes, and a second front closing plate, the middle closing plate common to the breaker room and a second rear closing plate are respectively disposed at the tube mouth positions; the middle seal plate is provided with a connecting sleeve and a second arc-resistant device arranged outside the connecting sleeve, the inner face of the second front seal plate is installed at the front end of the three-station switch, the middle end of the three-station switch is connected with the connecting sleeve through a middle movable contact base, the rear end of the three-station switch is connected with the supporting insulator bracket installed on the second rear seal plate, the supporting insulator bracket is connected with a bus and an inner taper sleeve in a barrel type air chamber above the three-station switch chamber, a second pressure relief valve is installed outside the second rear seal plate, a second operating mechanism used for controlling the three-station switch is installed outside the second front seal plate and is arranged in the three-station switch chamber, and the front end, the middle end and the rear end of the three-station switch are arranged in a horizontal line.

7. A three-phase common-tube gas-insulated metal-enclosed switchgear according to claim 6, wherein said first pressure relief valve, said second pressure relief valve, said connection chamber are in communication with said passage.