CN218957570U

CN218957570U - Gas-insulated switchgear

Info

Publication number: CN218957570U
Application number: CN202222466180.5U
Authority: CN
Inventors: 方昌健; 高驰; 王肖斌; 魏素华; 王亚鸽
Original assignee: Siemens High Voltage Switchgear Co Ltd
Current assignee: Siemens High Voltage Switchgear Co Ltd
Priority date: 2022-09-16
Filing date: 2022-09-16
Publication date: 2023-05-02
Anticipated expiration: 2032-09-16

Abstract

The gas-insulated switchgear includes three isolated earthing switches respectively connected to three-phase power lines and one three-phase mechanical linkage operating mechanism arranged outside the three isolated earthing switches, each isolated earthing switch being an isolated earthing switch of three stations, each isolated earthing switch including a switch housing and a switch rotating shaft extending from the switch housing, the three isolated earthing switches being arranged such that the respective switch rotating shafts are parallel to each other; the three-phase mechanical linkage operating mechanism comprises: the three driving units are arranged on the switch shells of the three isolated grounding switches in a one-to-one correspondence manner and are respectively in driving connection with the switch rotating shafts of the corresponding isolated grounding switches; the connecting rod unit comprises connecting rod connecting shafts connected with the driving units; and an operation unit connected with at least one of the three driving units and the link unit. The present disclosure achieves structural simplification of synchronous linkage operation of each isolation grounding switch of a gas-insulated switchgear.

Description

Gas-insulated switchgear

Technical Field

The present disclosure relates to a gas-insulated switchgear.

Background

Gas insulated switchgear (Gas Insulated Switchgear, abbreviated GIS) is widely used in various voltage class substations. The isolating earthing switch plays an important role as an important component in GIS equipment.

The isolating grounding switch comprises an isolating function and a grounding function, and the isolating function and the grounding function are realized by one integral switch. The structure of the integrated isolating grounding switch is preferably universal indoors and outdoors. The indoor and outdoor general isolation grounding switch structure is convenient for reducing the cost of GIS and production maintenance. However, for an isolated earthing switch used outdoors, a higher protection level needs to be met due to the need to adapt to outdoor climate conditions. For example, when used outdoors, ice coating occurs (e.g., in rainy conditions), and thus there are corresponding demands for protection, including demands for adaptation to working scenes of-35 degrees, operation can be ensured even under ice coating of at least 20cm, and so on. If ice coating occurs on the transmission mechanism, the switching operation action cannot be performed.

Conventional isolating earthing switches generally have two switch shafts which are operable from the outside, one for operating the isolating switch section and one for operating the earthing switch section. The traditional isolating grounding switch is characterized in that the three-phase opening and closing operation of the traditional isolating grounding switch is realized by independent external operating mechanisms respectively, so that the cost is high.

To simplify the operating mechanism and reduce the cost, the industry has begun to consider the use of three-phase mechanical linkage operating mechanisms. The three-phase mechanical linkage operating mechanism is mainly used for an isolation grounding switch used indoors. For an indoor isolated grounding switch, the isolation function and the grounding function of the three-phase switch can be realized by one three-phase mechanical linkage operating mechanism respectively because the indoor protection level is not required to be too high. For example, in order to achieve a mechanical linkage of the three-phase switch, in one existing gas-insulated switchgear, the operating mechanism has three drive cranks, the first ends of which are connected together by connecting rods, and the second ends of which are connected to the disconnecting switch portion or the rotating shaft of the grounding switch portion of the three-phase disconnecting and grounding switch, respectively. Thus, the isolation function is a mechanism shared by three phases, and the ground function is a mechanism shared by three phases. When the three-phase mechanical linkage operating mechanism is used indoors, the operating mechanism can be simplified and the cost is lower because only two operating mechanisms are provided.

However, in such a prior gas-insulated switchgear, the rotation planes of the respective drive cranks of the operating mechanism are parallel, and the connecting rod is perpendicular to the rotation planes of the respective drive cranks, thereby forming a spatially arranged three-phase mechanically linked operating mechanism. The spatially arranged three-phase mechanical linkage operating mechanism requires a larger operating space, and is difficult to externally arrange a protective cover, so that the spatially arranged three-phase mechanical linkage operating mechanism is not suitable for outdoor application occasions with higher protective requirements.

Therefore, for the outdoor isolated grounding switch, in order to meet the outdoor protection requirement, the isolated part and the grounding part of each isolated grounding switch still adopt an independent operating mechanism respectively, so six operating mechanisms are needed.

In addition, chinese patent No. CN203491176U discloses a gas-insulated metal-enclosed switchgear, in which an isolating earthing switch can provide three stations through one switch rotating shaft, and the three functions of "isolating switch on, earthing switch off, isolating switch off, earthing switch on" and "isolating switch off, earthing switch off" are respectively realized. Such a gas insulated switch simplifies the internal mechanism of the isolating earthing switch. Such gas insulated switchgear does not provide coordinated operation between the three phase switches nor does it involve outdoor protection of the switches.

The present disclosure proposes a gas-insulated switchgear that at least partially solves the drawbacks existing in the prior art.

Disclosure of Invention

One technical problem to be solved by the present disclosure is to provide a gas-insulated switchgear, which can achieve a structural simplification of synchronous linkage operation of each isolation grounding switch of the gas-insulated switchgear.

Another technical problem to be solved by the present disclosure is to provide a gas insulated switchgear, which can be adapted to meet indoor or outdoor protection requirements.

For solving the technical problem, the present disclosure provides a gas-insulated switchgear, including connecting in three isolation earthing switch and setting of three isolation earthing switch outside a three-phase mechanical linkage operating device, its characterized in that in three phase power line respectively: each of the isolating earthing switches is a three-station isolating earthing switch, the three stations of the isolating earthing switch comprise a first station for realizing the closing of the isolating switch and the opening of the earthing switch, a second station for realizing the opening of the isolating switch and the closing of the earthing switch and a third station for realizing the opening of the isolating switch and the opening of the earthing switch, each isolating earthing switch comprises a switch shell and a switch rotating shaft extending from the switch shell, and the three isolating earthing switches are arranged so that the respective switch rotating shafts are parallel to each other; the three-phase mechanical linkage operating mechanism is provided with three stations, and the three stations respectively correspond to the three stations of the isolation grounding switch, and the three-phase mechanical linkage operating mechanism comprises: the three driving units are arranged on the switch shells of the three isolation grounding switches in a one-to-one correspondence manner and are respectively in driving connection with the switch rotating shafts of the corresponding isolation grounding switches; a link unit including a link connection shaft connected to each of the driving units; and an operation unit connected with at least one of the three driving units and the link unit.

The three-station isolation grounding switch is adopted, so that the switch rotating shafts of the isolation grounding switches are parallel to each other, and the switch rotating shafts of the isolation grounding switches are connected through the three-phase mechanical linkage operation mechanism, thereby realizing the simplified synchronous linkage operation of the isolation grounding switches of the gas-insulated switchgear.

Further, according to an embodiment of the present disclosure, each of the driving units includes: a driving shaft rotatably mounted on the switch housing of the corresponding isolating and grounding switch; and the driving crank is fixedly arranged on the driving rotating shaft and comprises a first connecting point connected with the corresponding connecting rod connecting shaft and a second connecting point connected with the driving rotating shaft, and the driving crank is directly or indirectly in driving connection with the corresponding switch rotating shaft of the isolating grounding switch.

In the embodiment, the driving of the switch rotating shaft is realized through the rotation motion of the driving crank and the driving rotating shaft, and the structure is simple.

Further, according to an embodiment of the present disclosure, the three isolated ground switches are a first isolated ground switch, a second isolated ground switch, and a third isolated ground switch, respectively; the connecting rod unit comprises three connecting rod connecting shafts which are arranged side by side along a straight line and sequentially comprise a first connecting rod connecting shaft, a second connecting rod connecting shaft and a third connecting rod connecting shaft; the connecting rod unit further comprises a first connecting rod element and a second connecting rod element, wherein the first connecting rod element is connected between the first isolation grounding switch and the second isolation grounding switch through a first connecting rod connecting shaft and a second connecting rod connecting shaft, and the second connecting rod element is connected between the second isolation grounding switch and the third isolation grounding switch through a second connecting rod connecting shaft and a third connecting rod connecting shaft.

In the present embodiment, by providing the link unit as a segmented structure including the first link element and the second link element, it is convenient to achieve assembly and flexible arrangement of the gas-insulated switchgear.

Further, according to an embodiment of the present disclosure, the first, second and third isolated ground switches are arranged side by side in sequence along a straight line, and the first and second link elements extend along the same straight line or are offset in parallel.

In this embodiment, the first link member and the second link member extend in a straight line or in parallel with each other with a dislocation, so that the installation of the protection cover is facilitated.

Further, according to an embodiment of the present disclosure, each of the switch shafts is provided with a pinion thereon, and each of the driving units further includes: the sector gear is fixedly connected with the driving rotating shaft and meshed with the pinion, and the pitch circle diameter of the sector gear is larger than that of the pinion.

In this embodiment, the engagement of the sector gear with the pinion gear allows a larger range of movement of the switch shaft to be achieved with a smaller range of movement of the drive unit, thereby ensuring that the isolation earthing switch is in place.

Further, according to an embodiment of the present disclosure, the operation unit is disposed on a switch housing of one of the three isolated ground switches, a driving crank of the driving unit on the switch housing provided with the operation unit further includes a third connection point, the first connection point, the second connection point, and the third connection point are arranged in a triangle, and the operation unit includes: the device comprises an operation rotating shaft, an operation crank, a control rod and a control rod, wherein the operation rotating shaft is provided with a first end and a second end, the first end of the operation crank is connected to and driven by the operation rotating shaft, and the control rod is connected between the second end of the operation crank and a third connecting point of the driving crank.

In this embodiment, the operation unit includes an operation rotation shaft, an operation crank, and an operation lever, and the operation lever is connected with a third connection point on the driving crank of the driving unit, so that the operation unit is simple in structure and convenient to arrange.

Further, according to an embodiment of the present disclosure, a mounting bracket is provided on the switch housing provided with the operation unit, and the operation unit is provided on the switch housing through the mounting bracket.

In this embodiment, by providing the mounting bracket, the arrangement and mounting of the operation unit are facilitated.

Further, according to an embodiment of the present disclosure, the operation unit further includes a power source, and the operation rotation shaft is an output shaft of the power source.

In the present embodiment, the output shaft of the power source is used as the operation rotating shaft, so that the structure of the operation unit can be simplified, and the operation is stable and reliable.

Further, according to an embodiment of the present disclosure, the operation unit is provided on the switch housing of any one of the three isolated ground switches, and the gas-insulated switchgear further includes a first protection cover provided on the switch housing provided with the operation unit and covering the operation unit.

In the present embodiment, by protecting the operation unit, erroneous operation of the gas-insulated switchgear can be effectively avoided. The scheme is suitable for indoor gas-insulated switchgear.

Further, according to an embodiment of the present disclosure, the three isolated ground switches are a first isolated ground switch, a second isolated ground switch, and a third isolated ground switch that are sequentially arranged side by side along a straight line, and the link unit includes three link connection shafts that are sequentially a first link connection shaft, a second link connection shaft, and a third link connection shaft that are arranged side by side along a straight line; the connecting rod unit further comprises a first connecting rod element and a second connecting rod element, wherein the first connecting rod element is connected between the first isolation grounding switch and the second isolation grounding switch through a first connecting rod connecting shaft and a second connecting rod connecting shaft, the second connecting rod element is connected between the second isolation grounding switch and the third isolation grounding switch through a second connecting rod connecting shaft and a third connecting rod connecting shaft, the operation unit is arranged on a switch shell of the second isolation grounding switch, the first protection cover further covers the driving unit arranged on the switch shell of the second isolation grounding switch, the gas-insulated switching device further comprises two second protection covers, the two second protection covers are respectively arranged on the switch shells of the first isolation grounding switch and the second isolation grounding switch and respectively cover the corresponding driving unit, and the gas-insulated switching device further comprises two third protection covers respectively cover the first connecting rod element and the second connecting rod element.

In the present embodiment, the first, second, and third protection covers realize the cover protection of the entire three-phase mechanical linkage operation mechanism 2, and it is possible to avoid the failure to execute the switching operation due to the occurrence of ice coating on the transmission mechanism. The scheme is suitable for outdoor gas-insulated switchgear.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the present disclosure, and together with the description serve to explain the present disclosure. In the drawings, some of the structures are not shown for clarity of illustration of the relevant structures. In the drawings:

fig. 1 is a schematic perspective view of a gas-insulated switchgear according to a first embodiment of the present disclosure;

FIG. 1A is a schematic view of a part of the enlarged structure of the portion 1A in FIG. 1;

FIG. 1B is a schematic view of the part 1B of FIG. 1 in an enlarged partial structure;

fig. 2 is a schematic diagram of a front view of the gas-insulated switchgear of fig. 1 taken along the X-X position in fig. 4;

FIG. 2A is a schematic view of a part of the enlarged structure of the portion 2A in FIG. 2;

FIG. 2B is a schematic view of the part of FIG. 2B in an enlarged configuration;

fig. 3 is a schematic diagram of a front view of the gas-insulated switchgear of fig. 1;

FIG. 3A is a schematic view of a part of the enlarged structure of the portion 3A in FIG. 3;

FIG. 3B is a schematic view of the part of FIG. 3B in an enlarged configuration;

FIG. 4 is a schematic side view of the gas insulated switchgear of FIG. 1 showing the associated structure at a second isolated ground switch;

fig. 5 is a schematic diagram of a front view of a gas-insulated switchgear according to a second embodiment of the present disclosure, which is different from the first embodiment in that a first protective cover is added; and

Fig. 6 is a schematic diagram of a front view structure of a gas-insulated switchgear according to a third embodiment of the present disclosure, which is different from the first embodiment in that first, second, and third protective covers are added.

Reference numerals illustrate:

1. isolating the grounding switch; 11. A switch housing; 12. A switch rotating shaft;

13. a pinion gear;

2. a three-phase mechanical linkage operating mechanism; 21. A driving unit; 211. Driving the rotating shaft;

212. a drive crank; 213. A sector gear;

22. a link unit; 221. A connecting rod connecting shaft; 22a, first link element

22b, a second link element;

23. an operation unit; 231. operating the rotating shaft; 232. operating a crank;

233. an operation lever;

24. a mounting bracket;

31. a first protective cover; 32. a second protective cover; 33. and a third protective cover.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is intended to include the plural unless the context clearly indicates otherwise.

First, see fig. 1, 2, 3 and 4. Fig. 1 is a schematic perspective view of a gas-insulated switchgear according to a first embodiment of the present disclosure, fig. 2 is a schematic front view of the gas-insulated switchgear of fig. 1 taken along the X-X position of fig. 4, fig. 3 is a schematic top view of the gas-insulated switchgear of fig. 1, and fig. 4 is a schematic side view of the gas-insulated switchgear of fig. 1, showing the relevant structure at a second isolated ground switch.

The gas-insulated switchgear of the present disclosure includes three isolation ground switches 1 connected to three-phase power lines, respectively, and one three-phase mechanical linkage operating mechanism 2 provided outside the three isolation ground switches 1. The three isolation grounding switches 1 are sequentially arranged along a straight line and are a first isolation grounding switch, a second isolation grounding switch and a third isolation grounding switch respectively. Each isolating earthing switch 1 in the gas-insulated switchgear of the present disclosure is an isolating earthing switch of three stations, the three stations of the isolating earthing switch 1 include a first station for realizing the isolation switch and the earthing switch, a second station for realizing the isolation switch and the earthing switch, and a third station for realizing the isolation switch and the earthing switch. The three-phase mechanical linkage operating mechanism 2 is provided with three stations which respectively correspond to the three stations of the isolating grounding switch 1.

As can be seen from fig. 1 to 4, each of the isolated earth switches 1 includes a switch housing 11 and a switch rotation shaft 12 (see fig. 2) extending from the switch housing 11, and the three isolated earth switches 1 are arranged such that the respective switch rotation shafts 12 are parallel to each other. Referring to fig. 2, the three-phase mechanical linkage operating mechanism 2 includes: three drive units 21, one link unit 22, and one operation unit 23. The three driving units 21 are disposed on the switch housings 11 of the three isolated grounding switches 1 in a one-to-one correspondence manner, and are respectively in driving connection with the switch rotating shafts 12 of the corresponding isolated grounding switches 1. A link unit 22 including a link connection shaft 221 connected to each of the driving units 21; and an operation unit 23 connected to one of the three driving units 21. As a possible embodiment, the operating unit 23 can also be connected to the link unit 22.

The three-station isolation grounding switch is adopted, so that the switch rotating shafts of the isolation grounding switches are parallel to each other, and the switch rotating shafts of the isolation grounding switches are connected through the three-phase mechanical linkage operation mechanism, so that the simplified synchronous linkage operation of the isolation grounding switches of the gas-insulated switchgear is realized.

Fig. 1A, 2A and 3A show, respectively, from different angles, an enlarged structural schematic view of a portion of the three-phase mechanical linkage operating mechanism 2 disposed on the second isolation grounding switch located in the middle, and fig. 1B, 2B and 3B show, respectively, from different angles, an enlarged structural schematic view of a portion of the three-phase mechanical linkage operating mechanism 2 disposed on the first isolation grounding switch located on one side. The structure of the portion of the three-phase mechanical linkage operating mechanism 2 provided on the third isolated earthing switch on the other side is preferably symmetrical to the structure of the portion provided on the first isolated earthing switch shown in fig. 1B, 2B and 3B.

See fig. 2A and 2B, and may be combined with other related views. In the present embodiment, the driving units 21 are provided on the respective isolated earth switches 1, the link units 22 are connected to the respective driving units 21, and the operation unit 23 is provided on the switch housing 11 of the second isolated earth switch located in the middle of the three isolated earth switches 1. Alternatively, the operating unit may also be arranged on the switch housing of the first isolating earthing switch or the third isolating earthing switch.

Each of the driving units 21 includes: a driving shaft 211 rotatably installed on the switch housing 11 of the corresponding isolating earthing switch 1; and a driving crank 212 fixedly provided on the driving rotation shaft 211. The driving crank 212 includes a first connection point connected to the corresponding link connection shaft 221 and a second connection point connected to the driving rotation shaft 211, and the driving crank 212 is directly or indirectly in driving connection with the switch rotation shaft 12 of the corresponding isolating earthing switch 1.

The link unit 22 includes three link connection shafts 221, and the three link connection shafts 221 are arranged side by side along a straight line, and are a first link connection shaft, a second link connection shaft, and a third link connection shaft in this order. The link unit 22 further includes a first link member 22a and a second link member 22b, wherein the first link member 22a is connected between the first and second isolated ground switches through the first and second link connection shafts, and the second link member 22b is connected between the second and third isolated ground switches through the second and third link connection shafts.

As can be seen from fig. 3, in this embodiment the first and

second link elements

22a, 22b extend in parallel with a misalignment. Alternatively, the first link member 22a and the second link member 22b may be configured to extend along the same straight line.

Referring to fig. 2, 2A and 2B, it can be seen that each of the switch shafts 12 is provided with a pinion 13, and each of the driving units 21 further includes: a sector gear 213 fixedly connected to the driving shaft 211 and engaged with the pinion 13, wherein a pitch diameter of the sector gear 213 is larger than a pitch diameter of the pinion 13.

Still referring to fig. 2, 2A and 2B, it can be seen that since the operating unit 23 is provided on said switch housing 11 of the second isolating and grounding switch, the drive crank 212 of the drive unit 21 at this switch housing 11 further comprises a third connection point for connection with the operating unit 23. Specifically, the operation unit 23 includes: an operation rotation shaft 231, an operation crank 232, and an operation lever 233. The operation crank 232 has a first end and a second end, and the first end of the operation crank 232 is connected to the operation rotation shaft 231 and driven by the operation rotation shaft 231. An operating lever 233 is connected between the second end of the operating crank 232 and the third connection point of the drive crank 212. The first, second and third connection points on the drive crank 212 are arranged in a triangle.

In this embodiment, since the operation unit includes the operation rotating shaft, the operation crank and the operation lever, and the operation lever is connected with the third connection point on the driving crank of the driving unit, the operation unit is simple in structure and convenient to arrange.

As can be seen from fig. 1A and 4, a mounting bracket 24 is provided on the switch housing 11 of the second isolating and grounding switch, and the operating unit 23 is provided on the switch housing 11 of the second isolating and grounding switch by means of the mounting bracket 24.

Preferably, the operation unit 23 may further include a power source, such as a motor, etc. In one embodiment, the operating shaft 231 may be an output shaft of a power source.

Referring to fig. 5, there is shown a schematic diagram of a front view of a gas-insulated switchgear according to a second embodiment of the present disclosure, which is different from the first embodiment shown in fig. 1 to 4 in that a first protective cover 31 is added. The first protective cover 31 is provided on the switch housing 11 of the second insulating ground switch located in the middle, and covers the operation unit 23 provided on the switch housing 11.

Referring to fig. 6, there is shown a schematic diagram of a gas-insulated switchgear according to a third embodiment of the present disclosure, which is different from the second embodiment in that a second protective cover 32 and a third protective cover 33 are further added. The first protective cover 31 covers the driving unit 21 and the operating unit 23 provided on the switch housing 11 of the second isolating-grounding switch. Two second protective covers 32 are respectively provided on the switch housings 11 of the first and second isolating and grounding switches, and respectively cover the respective driving units 21. Two third protective covers 33 cover the first link element 22a and the second link element 22b, respectively.

The transmission chain of the outdoor gas-insulated switchgear cannot be frozen. This is the difference between outdoor and indoor use. In the present embodiment, the first, second, and third protection covers realize the cover protection of the entire three-phase mechanical linkage operation mechanism 2, and it is possible to avoid the failure to execute the switching operation due to the occurrence of ice coating on the transmission mechanism. Therefore, the scheme is suitable for outdoor gas-insulated switchgear.

The key of the design of the three-phase isolating grounding switch is that the operation of the three-phase isolating grounding switch is driven by one operating mechanism, so that the three-phase isolating switch part and the three-phase grounding switch part can be simultaneously in a closing or opening state. The operating mechanism of the present disclosure mechanically ensures that the three-phase transmission is synchronized, the operation of the grounding switch portion is three-phase mechanically linked, and the operation of the isolating switch portion is also three-phase mechanically linked.

Therefore, the three-phase mechanical linkage operation mechanism with three stations drives the three-station isolation grounding switches, and simultaneously three-phase mechanical linkage of the three isolation grounding switches is realized. On this basis, if the device is to be used outdoors, only the device (protective cover) for outdoor protection needs to be added. Since the novel mechanism of the present disclosure is translational (the transmission is driven substantially in a generally planar plane), outdoor protection is readily achieved. The transmission part of the operating mechanism is universal in different situations of outdoor use or indoor use, and only the outdoor protective cover part is needed to be added in the situations of outdoor use.

The foregoing is merely a preferred embodiment of the present disclosure, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present disclosure, which are intended to be comprehended within the scope of the present disclosure.

Claims

1. The gas-insulated switchgear comprises three isolation grounding switches (1) respectively connected to a three-phase power line and a three-phase mechanical linkage operating mechanism (2) arranged outside the three isolation grounding switches (1), and is characterized in that:

each of the isolating earthing switches (1) is a three-station isolating earthing switch, the three stations of the isolating earthing switch (1) comprise a first station for realizing the closing of the isolating switch and the opening of the earthing switch, a second station for realizing the opening of the isolating switch and the opening of the earthing switch and a third station for realizing the opening of the isolating switch and the opening of the earthing switch, each of the isolating earthing switches (1) comprises a switch shell (11) and a switch rotating shaft (12) extending from the switch shell (11), and the three isolating earthing switches (1) are arranged so that the respective switch rotating shafts (12) are parallel to each other;

the three-phase mechanical linkage operating mechanism (2) is provided with three stations, and the three stations respectively correspond to the three stations of the isolation grounding switch (1), and the three-phase mechanical linkage operating mechanism (2) comprises:

the three driving units (21) are arranged on the switch shells (11) of the three isolation grounding switches (1) in a one-to-one correspondence manner and are respectively in driving connection with the switch rotating shafts (12) of the corresponding isolation grounding switches (1);

a link unit (22) including a link connection shaft (221) connected to each of the drive units (21); and

an operation unit (23) connected to at least one of the three driving units (21) and the link unit (22).

2. A gas-insulated switchgear as claimed in claim 1, wherein,

each of the drive units (21) includes:

a driving shaft (211) rotatably mounted on a switch housing (11) of the corresponding isolating earthing switch (1); and

the driving crank (212) is fixedly arranged on the driving rotating shaft (211), the driving crank (212) comprises a first connecting point connected with the corresponding connecting rod connecting shaft (221) and a second connecting point connected with the driving rotating shaft (211), and the driving crank (212) is directly or indirectly in driving connection with the corresponding switch rotating shaft (12) of the isolating grounding switch (1).

3. A gas-insulated switchgear as claimed in claim 2, wherein,

the three isolation grounding switches (1) are a first isolation grounding switch, a second isolation grounding switch and a third isolation grounding switch respectively;

the connecting rod unit (22) comprises three connecting rod connecting shafts (221), wherein the three connecting rod connecting shafts (221) are arranged side by side along a straight line, and are sequentially a first connecting rod connecting shaft, a second connecting rod connecting shaft and a third connecting rod connecting shaft;

the connecting rod unit (22) further comprises a first connecting rod element (22 a) and a second connecting rod element (22 b), wherein the first connecting rod element (22 a) is connected between the first isolation grounding switch and the second isolation grounding switch through the first connecting rod connecting shaft and the second connecting rod connecting shaft, and the second connecting rod element (22 b) is connected between the second isolation grounding switch and the third isolation grounding switch through the second connecting rod connecting shaft and the third connecting rod connecting shaft.

4. A gas-insulated switchgear as claimed in claim 3, wherein,

the first isolation grounding switch, the second isolation grounding switch and the third isolation grounding switch are sequentially arranged side by side along a straight line,

the first link element (22 a) and the second link element (22 b) extend along the same straight line or are offset and parallel.

5. A gas-insulated switchgear as claimed in claim 2, wherein,

a pinion (13) is arranged on each switch rotating shaft (12),

each of the drive units (21) further comprises:

and the sector gear (213) is fixedly connected with the driving rotating shaft (211) and meshed with the pinion (13), and the pitch circle diameter of the sector gear (213) is larger than that of the pinion (13).

6. A gas-insulated switchgear as claimed in claim 2, wherein,

the operating unit (23) is arranged on the switch shell (11) of one of the three isolating grounding switches (1),

the drive crank (212) of the drive unit (21) on the switch housing (11) provided with the operating unit (23) further comprises a third connection point, the first, second and third connection points being arranged in a triangle,

the operation unit (23) includes:

an operation shaft (231),

an operating crank (232) having a first end and a second end, the first end of the operating crank (232) being connected to the operating shaft (231) and being driven by the operating shaft (231), and

and an operating lever (233) connected between the second end of the operating crank (232) and a third connection point of the driving crank (212).

7. A gas-insulated switchgear as claimed in claim 6, wherein,

a mounting bracket (24) is arranged on the switch shell (11) provided with the operation unit (23),

the operation unit (23) is arranged on the switch housing (11) through the mounting bracket (24).

8. A gas-insulated switchgear as claimed in claim 6, wherein,

the operating unit (23) further comprises a power source,

the operation rotation shaft (231) is an output shaft of the power source.

9. A gas-insulated switchgear as claimed in claim 6, wherein,

the operation unit (23) is arranged on the switch shell (11) of any one of the three isolation grounding switches (1),

the gas-insulated switchgear further comprises a first protective cover (31) which is provided on the switch housing (11) provided with the operation unit (23) and covers the operation unit (23).

10. A gas-insulated switchgear as claimed in claim 9, wherein,

the three isolation grounding switches (1) are a first isolation grounding switch, a second isolation grounding switch and a third isolation grounding switch which are sequentially arranged side by side along a straight line,

the link unit (22) further comprises a first link element (22 a) and a second link element (22 b), wherein the first link element (22 a) is connected between the first and second isolated ground switches through the first and second link connection shafts, the second link element (22 b) is connected between the second and third isolated ground switches through the second and third link connection shafts,

the operation unit (23) is arranged on the switch shell (11) of the second isolation grounding switch,

the first protective cover (31) also covers the drive unit (21) arranged on the switch housing (11) of the second isolating-grounding switch,

the gas-insulated switchgear also comprises two second protective covers (32), wherein the two second protective covers (32) are respectively arranged on the switch shells (11) of the first isolation grounding switch and the second isolation grounding switch and respectively cover the corresponding driving units (21),

the gas-insulated switchgear further comprises two third protective covers (33) covering the first link element (22 a) and the second link element (22 b), respectively.