A gas-insulated switchgear

Abstract

A gas-insulated switchgear cabinet includes a busbar chamber, a busbar and a three-position disconnector installed in the busbar chamber, a busbar grounding switch provided between the busbar and the three-position disconnector, the busbar grounding switch comprising a first operating mechanism, a first moving contact, a first isolating static contact, and a first grounding static contact, the three-position disconnector comprising a connecting static contact, the first isolating static contact and the connecting static contact being combined to form a combined static contact, the first moving contact performing linear reciprocating motion between the combined static contact and the first grounding static contact under the action of the first operating mechanism; when the three-position disconnector is in an isolated or grounded state, the first moving contact is driven by manual operation of the first operating mechanism to cooperate with the first grounding static contact to achieve busbar grounding. The gas-insulated switchgear cabinet of the present invention achieves dual protection functions of line-side grounding and busbar-side grounding by adding a busbar grounding switch in the switchgear cabinet.

Description

Technical Field

[0001] The present invention relates to the technical field of switchgear, and in particular to a gas-insulated switch cabinet. Background Art

[0002] The gas insulated cabinet is usually configured as a three-position disconnector on the line side to realize the line side grounding switch. A dedicated grounding switch is configured on the bus side. When the bus needs to be grounded, it can only be achieved through the grounding switch configured on the upper level of the system (such as the high-voltage transformer output side) or the three-position disconnector and circuit breaker secondary closing on the sectionalizing cabinet configured in this system. The implementation method of grounding the sectionalizing bus using the sectionalizing cabinet is combined with Figure 10 It can be seen that busbar grounding requires opening the circuit breaker, then opening all three-position disconnectors on the busbar, then grounding the three-position disconnectors, and finally closing the circuit breaker. At this time, the busbar is in a grounded state. It can be seen that the grounding procedure of the busbar or segmented busbar depends on the system configuration. If the system is not configured with the upper level / upper level grounding switch or the switchgear system is not configured with a segmented connecting cabinet, direct grounding of the busbar cannot be achieved, which brings huge safety hazards to on-site maintenance and does not comply with current operation and safety regulations. Summary of the Invention

[0003] The object of the present invention is to overcome the defects of the prior art and provide a switch cabinet with high reliability and busbar direct grounding function.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A gas-insulated switchgear, whose internal space includes a busbar chamber, in which a busbar and a three-position disconnector are installed, and a busbar earthing switch is provided between the busbar and the three-position disconnector, wherein the busbar earthing switch includes a first operating mechanism, a first moving contact, a first isolating static contact and a first grounding static contact, and the three-position disconnector includes a connecting static contact, wherein the first isolating static contact and the connecting static contact are combined to form a combined static contact, and the first moving contact performs a linear reciprocating motion between the combined static contact and the first grounding static contact under the action of the first operating mechanism; when the three-position disconnector is in an isolated or grounded state, the first moving contact is driven by the first operating mechanism to cooperate with the first grounding static contact to achieve busbar grounding.

[0006] Furthermore, the busbar earthing switch is a direct-acting two-position busbar earthing switch, the three-position disconnector is a knife-switch type three-position disconnector, the busbar is arranged at the upper part of the busbar chamber, the three-position disconnector is arranged at the lower part of the busbar chamber, and a busbar earthing switch is arranged in the middle part of the busbar chamber. The combined static contact is located between the busbar earthing switch and the three-position disconnector, and the connection static contact in the combined static contact is located on the side close to the three-position disconnector.

[0007] Furthermore, the combined static contact includes a cylindrical conductive block and a rectangular conductive block, the cylindrical conductive block serves as the first isolating static contact, and the rectangular conductive block serves as the connecting static contact. A cavity for the first moving contact to mate and extend into is provided at one end of the cylindrical conductive block as a mating end, and the other end serves as a connecting end for fixing to the busbar chamber. The rectangular conductive block is fixed to one side of the cylindrical conductive block.

[0008] Furthermore, the busbar chamber also includes a support insulator and a first transmission sealing device. A first through-hole is provided on one side of the busbar chamber, and the first through-hole is sealed by the first transmission sealing device. A support insulator is provided on the side of the busbar chamber opposite to the first through-hole. The combined static contact is provided on the support insulator, and a transmission screw is slidingly provided on the first transmission sealing device. One end of the transmission screw is connected to the output shaft of the first operating mechanism, and the other end of the transmission screw passes through the first grounding static contact and is connected to the first moving contact, and the first moving contact moves in a straight line between the first grounding static contact and the combined static contact under the drive of the transmission screw.

[0009] Furthermore, annular grooves are respectively provided at both ends of the first moving contact, a conductive contact finger is installed in each annular groove, and the two conductive contact fingers are installed in reverse.

[0010] Furthermore, the three-position disconnector includes a second operating mechanism, an insulating pull rod, a second moving contact assembly, a second grounding static contact seat and a grounding insulator. The grounding insulator and the second grounding static contact seat are arranged on the side of the busbar chamber away from the busbar. The second moving contact assembly is rotatably mounted on the grounding insulator. Under the drive of the second operating mechanism, the second moving contact assembly rotates under the action of the insulating pull rod and cooperates with the second grounding static contact seat or the connecting static contact.

[0011] Furthermore, a second through-hole is provided on one side of the busbar chamber, and a second transmission sealing device for sealing the second through-hole is provided on the second through-hole. The output shaft of the second operating mechanism is slidably passed through the second transmission sealing device, one end of the insulating pull rod is connected to the output shaft of the second operating mechanism, and the other end of the insulating pull rod is connected to the second moving contact assembly. Under the drive of the second operating mechanism, the insulating pull rod drives the second moving contact assembly to rotate and cooperate with the second grounding static contact seat or the connecting static contact.

[0012] Furthermore, the second moving contact assembly includes at least one pair of oppositely arranged conductive plates and connecting pieces, one end of the conductive plate is rotatably mounted on the central conductor of the grounding insulator, and the other end of the conductive plate is connected together through a connecting beam. The connecting piece is cylindrical, and a connecting arm is provided in the middle thereof for fixed connection with the connecting beam, and both ends of the connecting piece are used for rotatably connecting with the insulating pull rod.

[0013] Furthermore, the connecting beam is located in the middle of the conductive sheet and makes the pair of oppositely arranged conductive sheets "H" shaped, and the gap between the two oppositely arranged conductive sheets is used to cooperate with the connecting static contact and the second grounding static contact seat.

[0014] Furthermore, the combined static contact is connected to the busbar in the busbar chamber via a connecting busbar.

[0015] Furthermore, the first operating mechanism of the busbar grounding switch is provided with a detachable handle, and a closable movable door is provided at the handle socket.

[0016] Furthermore, its internal space also includes a control room, the first operating mechanism of the busbar earthing switch is arranged in the control room, and the second operating mechanism of the three-position disconnector is arranged in the control room. A first through-hole and a second through-hole are provided on the side wall between the control room and the busbar room. A first transmission sealing device is provided in the first through-hole, and the output shaft of the first operating mechanism passes through the first transmission sealing device to operate the first moving contact in the busbar room; a second transmission sealing device is provided in the second through-hole, and the output shaft of the second operating mechanism passes through the second transmission sealing device to operate the three-position disconnector in the busbar room.

[0017] Compared with existing switchgear that can only realize bus-side grounding or line-side grounding, a gas-insulated switchgear of the present invention realizes the dual protection functions of line-side grounding and bus-side grounding by adding a busbar grounding switch in the switchgear, combines the busbar grounding cabinet and the three-position isolating switch cabinet together, and especially combines the closing static contact of the three-position isolating switch with the isolating switch of the busbar grounding switch, thereby optimizing the system resource configuration and improving the equipment space utilization.

[0018] In addition, the combined static contact is composed of the connection static contact of the three-position disconnector and the first isolating static contact of the busbar grounding switch, which has a simplified structure and is easy and reliable to install; the second moving contact assembly of the three-position disconnector is composed of conductive plates arranged in pairs, and the number of conductive plates can be increased or decreased to meet the current carrying capacity requirements of different current levels; the first operating mechanism is equipped with mechanical and electrical locks to ensure the connection conditions of on-site electrical equipment and the safety of working procedures, and prevent misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of a gas-insulated switchgear according to the present invention;

[0020] Figure 2 This is a structural diagram of a busbar grounding switch in a gas-insulated switchgear according to the present invention;

[0021] Figure 3 This is a schematic diagram of a busbar grounding switch in a gas-insulated switchgear according to the present invention in an isolated state;

[0022] Figure 4 This is a schematic diagram of a busbar grounding switch in a gas-insulated switchgear according to the present invention in a grounding state;

[0023] Figure 5 This is a structural schematic diagram of a combined static contact in a gas-insulated switchgear according to the present invention;

[0024] Figure 6 This is a structural schematic diagram of a second moving contact assembly in a gas-insulated switchgear according to the present invention;

[0025] Figure 7 This is a schematic diagram of a gas-insulated switchgear cabinet according to the present invention;

[0026] Figure 8 yes Figure 3 Schematic diagram;

[0027] Figure 9 yes Figure 4 Schematic diagram;

[0028] Figure 10 It is a schematic diagram in the background art;

[0029] In the figure: 5-Circuit breaker. DETAILED DESCRIPTION

[0030] The following is combined with Figures 1 to 9 The following embodiments further illustrate the specific implementation of a gas-insulated switchgear according to the present invention. The gas-insulated switchgear according to the present invention is not limited to the description of the following embodiments.

[0031] A gas-insulated switchgear, whose internal space includes a busbar chamber a, in which a busbar 3 and a three-position disconnector 2 are installed, and a busbar earthing switch 1 is provided between the busbar 3 and the three-position disconnector 2, wherein the busbar earthing switch 1 includes a first operating mechanism 11, a first moving contact 12, a first isolating static contact 13 and a first grounding static contact 14, and the three-position disconnector 2 includes a connecting static contact 22, wherein the first isolating static contact 13 and the connecting static contact 22 are combined to form a combined static contact, and the first moving contact 12 performs a linear reciprocating motion between the combined static contact and the first grounding static contact 14 under the action of the first operating mechanism 11; when the three-position disconnector 2 is in an isolated or grounded state, the first operating mechanism 11 is manually operated to drive the first moving contact 12 to cooperate with the first grounding static contact 14 to achieve grounding of the busbar 3.

[0032] Compared with the existing switchgear that can only achieve bus-side grounding or only achieve line-side grounding, the gas-insulated switchgear of the present invention achieves the dual protection functions of line-side grounding and bus-side grounding by adding a busbar grounding switch 1 in the switchgear, and combines the busbar grounding cabinet and the three-position disconnector switch cabinet together. In particular, by combining the closing static contact 22 of the three-position disconnector 2 with the disconnector of the busbar grounding switch 1, the system resource configuration is optimized and the equipment space utilization rate is improved.

[0033] like Figure 1 As shown, a gas-insulated switchgear has an internal space divided into a busbar chamber a, a circuit breaker chamber, a cable chamber, a control chamber b, and a pressure relief channel. A busbar 3 and a three-position disconnector 2 are installed in the busbar chamber a. A busbar earthing switch 1 is provided between the busbar 3 and the three-position disconnector 2. The busbar earthing switch 1 includes a first operating mechanism 11, a first moving contact 12, a first isolating static contact 13, and a first grounding static contact 14. Preferably, Figure 1-5 As shown, the closing static contact 22 of the three-position disconnector 2 is combined with the first isolating static contact 13 to form a combined static contact, and the first moving contact 12 performs a linear reciprocating motion between the combined static contact and the first grounding static contact 14 under the action of the first operating mechanism 11; when the three-position disconnector 2 is in the isolated or grounded state, the first moving contact 12 is driven by manual operation of the first operating mechanism 11 to cooperate with the first grounding static contact 14 to realize the grounding of the busbar 3. The busbar grounding switch 1 is only allowed to be operated manually and electric operation is not allowed. It is preferred that the first operating mechanism 11 and the second operating mechanism 21 of the three-position disconnector 2 are arranged in the control room b, and mechanical and electrical locks are added to the first operating mechanism 11 of the busbar grounding switch 1 to ensure the safety of the connection conditions and working procedures of the on-site electrical equipment and prevent misoperation.

[0034] Specific examples Figure 1 As shown, the busbar chamber a is arranged in the upper part of the cabinet, the busbar earthing switch 1 is a direct-acting two-position busbar earthing switch 1, the three-position disconnector 2 is a knife-type three-position disconnector 2, the busbar 3 is arranged in the upper part of the busbar chamber a, and the three-position disconnector 2 is arranged in the lower part of the busbar chamber a. The busbar earthing switch 1 is arranged in the middle of the busbar chamber a, and the connecting static contact 22 in the combined static contact is located on the side close to the three-position disconnector 2, which is conducive to the cooperation between the second moving contact assembly 26 of the three-position disconnector 2 and the combined static contact.

[0035] The preferred embodiment of the combined static contact is as follows Figure 2-5As shown, it includes a cylindrical conductive block and a rectangular conductive block. The cylindrical conductive block serves as the first isolating static contact 13, and the rectangular conductive block serves as the connecting static contact 22. One end of the cylindrical conductive block is provided with a cavity for the first moving contact 12 to extend into, and the other end serves as a connecting end for fixing to the busbar chamber a. The rectangular conductive block is fixed to one side of the cylindrical conductive block. Figure 3 As shown, the first moving contact 12 and the first isolating static contact 13 can be fully extended into the cavity when they are matched; Figure 4 As shown, when the first moving contact 12 is mated with the first grounding static contact 14, the first moving contact 12 completely extends out of the cavity. Preferably, the combined static contact is integrally formed.

[0036] The busbar chamber a also includes a support insulator 15 and a first transmission sealing device 16. Preferably, the support insulator 15 and the first transmission sealing device 16 are arranged opposite each other on the two side walls of the busbar chamber a. A first through-hole is provided on one side of the busbar chamber a, and the first through-hole is sealed by the first transmission sealing device 16. The support insulator 15 is provided on the side of the busbar chamber a opposite the first through-hole. The combined static contact is provided on the support insulator 15. A transmission screw 17 is slidably inserted through the first transmission sealing device 16. One end of the transmission screw 17 is connected to the output shaft of the first operating mechanism 11, and the other end of the transmission screw 17 passes through the first grounding static contact 14 and is connected to the first moving contact 12. The first moving contact 12 moves linearly between the first grounding static contact 14 and the combined static contact under the drive of the transmission screw 17. Preferably, the transmission screw 17 is preferably made of reinforced nylon material and is an M18 screw with a pitch of 4 mm. Of course, the transmission screw 17 can also be other screws that meet transmission and insulation requirements. Annular grooves are provided at both ends of the first moving contact 12, and a conductive contact finger is installed in each annular groove. The two wire contact fingers are installed in reverse. The conductive contact fingers are spring contact fingers and are preferably made of chromium-zirconium copper with good conductivity and high hardness.

[0037] The three-position disconnector 2 includes a second operating mechanism 21, an insulating pull rod 23, a second moving contact assembly 26, a second grounding static contact seat 24 and a grounding insulator 27. The grounding insulator 27 and the second grounding static contact seat 24 are arranged on the side of the busbar chamber a away from the busbar 3. The second moving contact assembly 26 is rotatably mounted on the grounding insulator 27. Under the drive of the second operating mechanism 21, the second moving contact assembly 26 rotates under the action of the insulating pull rod 23 and cooperates with the second grounding static contact seat 24 or the connecting static contact 22. Specifically, a second through-hole is provided on one side of the busbar chamber a, and a second transmission sealing device 25 for sealing the second through-hole is provided on the second through-hole. The output shaft of the second operating mechanism 21 is slidably penetrated through the second transmission sealing device 25, and one end of the insulating pull rod 23 is connected to the output shaft of the second operating mechanism 21, and the other end of the insulating pull rod 23 is connected to the second moving contact assembly 26. Under the drive of the second operating mechanism 21, the insulating pull rod 23 drives the second moving contact assembly 26 to rotate and cooperate with the second grounding static contact seat 24 or the connecting static contact 22.

[0038] Another improvement of the present invention is that it can ensure that the cabinet is not electrified during maintenance. The principle is as follows: the connection static contact 22 of the three-position disconnector 2 is directly electrically connected to the busbar, while the second moving contact assembly 26 of the three-position disconnector 2 is not directly electrically connected to the busbar. The second moving contact assembly 26 will be electrically connected to the busbar only when it cooperates with the connection static contact 22. Therefore, when the second moving contact assembly 26 is disconnected from the connection static contact 22, the insulating pull rod 23 and the second operating mechanism 21 connected to the second moving contact assembly 26 will not be electrically connected to the busbar. The entire cabinet can be made de-energized by manually operating the first operating mechanism 11 to disconnect the electrical connection with the busbar.

[0039] The second moving contact assembly 26 is as follows Figure 6 As shown, the second moving contact assembly 26 includes at least one pair of conductive plates 26a and connectors 26b disposed opposite to each other. The number of conductive plates 26a can be increased or decreased according to the actual current to meet the current carrying capacity requirements of different current levels. Figure 6Two pairs of conductive plates 26a are shown. Preferably, a pair of opposing conductive plates 26a can carry a current of 630A, two pairs can carry a current of 1250A, four pairs can carry a current of 2500A, and so on. One end of each conductive plate 26a is rotatably mounted on the center conductor of the grounding insulator 27. The other ends of the conductive plates 26a are connected together via a connecting beam 26c. The connecting member 26b is cylindrical and has a connecting arm 26d at its center for fixed connection to the connecting beam 26c. Both ends of the connecting member 26b are rotatably connected to the insulating rod 23. Driven by the insulating rod 23, the connecting arm 26d drives the connecting beam 26c, causing the conductive plates 26a to rotate. The connecting beam 26 c is located in the middle of the conductive sheet 26 a and makes the pair of opposite conductive sheets 26 a form an “H” shape. The gap between the two opposite conductive sheets 26 a is used to cooperate with the connecting static contact 22 and the second grounding static contact seat 24 .

[0040] As an embodiment, Figure 1 As shown, the busbar 3 is arranged at the upper part of the busbar chamber a, the grounding insulator 27 and the second grounding static contact seat 24 are arranged at the lower part of the busbar chamber a, and a first through-hole and a second through-hole are provided on one side of the busbar chamber a, preferably the second through-hole is located below the first through-hole, and a first transmission sealing device 16 and a second transmission sealing device 25 are respectively provided in the first through-hole and the second through-hole for sealing, a support insulator 15 is provided on the side opposite to the first transmission sealing device 16, and a combined static contact is provided on the support insulator 15, preferably the combined static contact is connected to the busbar 3 at the upper part of the busbar chamber a through the connecting busbar 4, the connection static contact 22 on the combined static contact is located on the lower side of the combined static contact, and the first isolating static contact 13 of the combined static contact is on the same axis as the first moving contact 12, the transmission screw 17, the first grounding static contact 14, and the first transmission sealing device 16. , the transmission screw 17 drives the first moving contact 12 to move linearly between the first grounding static contact 14 and the first isolating static contact 13 of the combined static contact; the second moving contact assembly 26 of the three-position isolating switch 2 is installed on the grounding insulator 27, and the output shaft of the second operating mechanism 21 passes through the second transmission sealing device 25 and is connected to the insulating pull rod 23 through a bevel gear transmission structure. The bevel gear transmission structure includes a first bevel gear and a second bevel gear that are meshed with each other. The output shaft of the second operating mechanism 21 passes through the second transmission sealing device 25 and is connected to the first bevel gear. The insulating pull rod 23 is connected to the second bevel gear. Under the action of the second operating mechanism 21, the insulating pull rod 23 drives the second moving contact assembly 26 to rotate. During the rotation process, the second moving contact assembly 26 cooperates with the second grounding static contact seat 24 and the connection static contact 22 in the combined static contact. As shown Figure 1As shown, the static contact 22 is obviously located above the second moving contact assembly 26. When the insulating pull rod 23 breaks or fails, the second moving contact assembly 26 will not contact the static contact 22 and energize under the action of gravity, causing a safety hazard. The control room b is located on the side adjacent to the busbar room a. Preferably, the first perforation and the second perforation are set on the side wall between the busbar room a and the control room b. The second operating mechanism 21 and the first operating mechanism 11 are both set in the control room b. The first operating mechanism 11 is preferably provided with a detachable handle (not shown in the figure), and a closable movable door (not shown in the figure) is provided at the socket of the handle. When the busbar 3 needs to be grounded, the three-position disconnector 2 is placed in an isolated or grounded state, the movable door is opened, the handle is inserted and the handle is rotated to drive the transmission screw 17 The first moving contact 12 moves. After the first moving contact 12 cooperates with the first grounding static contact 14, the handle is stopped from being rotated and the handle is pulled out, and the movable door is closed. When it is necessary to release the grounding of the busbar 3, the movable door is opened, the handle is inserted and rotated to make the transmission screw 17 drive the first moving contact 12 to separate from the first grounding static contact 14. When the first moving contact 12 cooperates with the busbar 3 isolating switch in the combination switch, the handle is stopped from being rotated, and the movable door is closed after the handle is pulled out, thereby ensuring the connection conditions of the on-site electrical equipment and the safety of the working procedures and preventing misoperation.

[0041] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A gas-insulated switchgear, wherein the internal space thereof includes a busbar chamber (a), characterized in that: A busbar (3) and a three-position disconnector (2) are installed in the busbar chamber (a); a busbar grounding switch (1) is provided between the busbar (3) and the three-position disconnector (2); the busbar grounding switch (1) comprises a first operating mechanism (11), a first moving contact (12), a first isolating static contact (13) and a first grounding static contact (14); the three-position disconnector (2) comprises a second operating mechanism (21), an insulating pull rod (23), a second moving contact assembly (26), a second grounding static contact seat (2 4) and the connecting static contact (22), under the drive of the second operating mechanism (21), the second moving contact assembly (26) rotates under the action of the insulating pull rod (23) and cooperates with the second grounding static contact seat (24) or the connecting static contact (22), the first isolating static contact (13) and the connecting static contact (22) are combined to form a combined static contact, and the first moving contact (12) performs a linear reciprocating motion between the combined static contact and the first grounding static contact (14) under the action of the first operating mechanism (11).

2. A gas-insulated switchgear according to claim 1, characterized in that: The busbar grounding switch (1) is a direct-acting two-position busbar grounding switch, the three-position isolating switch (2) is a knife-type three-position isolating switch, the busbar (3) is arranged at the upper part of the busbar chamber (a), the three-position isolating switch (2) is arranged at the lower part of the busbar chamber (a), the busbar grounding switch (1) is arranged in the middle part of the busbar chamber (a), the combined static contact is located between the busbar grounding switch (1) and the three-position isolating switch (2), and the connection static contact (22) in the combined static contact is located on the side close to the three-position isolating switch (2).

3. The gas-insulated switchgear according to claim 1, characterized in that: The combined static contact comprises a cylindrical conductive block and a rectangular conductive block, wherein the cylindrical conductive block serves as a first isolating static contact (13), and the rectangular conductive block serves as a connecting static contact (22). A cavity for the first moving contact (12) to fit into is provided at one end of the cylindrical conductive block as a mating end, and the other end serves as a connecting end for being fixed to a busbar chamber (a). The rectangular conductive block is fixed to one side of the cylindrical conductive block.

4. The gas-insulated switchgear according to claim 1, characterized in that: The busbar chamber (a) further includes a support insulator (15) and a first transmission sealing device (16). A first through-hole is provided on one side of the busbar chamber (a), and the first through-hole is sealed by the first transmission sealing device (16). A support insulator (15) is provided on the side of the busbar chamber (a) opposite to the first through-hole. The combined static contact is provided on the support insulator (15). A transmission screw (17) is slidably provided on the first transmission sealing device (16). One end of the transmission screw (17) is connected to the output shaft of the first operating mechanism (11), and the other end of the transmission screw (17) passes through the first grounding static contact (14) and is connected to the first moving contact (12). The first moving contact (12) moves linearly between the first grounding static contact (14) and the combined static contact under the drive of the transmission screw (17).

5. The gas-insulated switchgear according to claim 1, characterized in that: Annular grooves are respectively provided at both ends of the first moving contact (12), a conductive contact finger is installed in each annular groove, and the two conductive contact fingers are installed in a positive and negative manner.

6. The gas-insulated switchgear according to claim 1, characterized in that: The three-position disconnect switch (2) further comprises a grounding insulator (27), wherein the grounding insulator (27) and a second grounding static contact seat (24) are arranged on a side of the busbar chamber (a) away from the busbar (3), and a second moving contact assembly (26) is rotatably mounted on the grounding insulator (27).

7. The gas-insulated switchgear according to claim 6, characterized in that: A second through-hole is provided on one side of the busbar chamber (a), and a second transmission sealing device (25) for sealing the second through-hole is provided on the second through-hole. The output shaft of the second operating mechanism (21) is slidably penetrated through the second transmission sealing device (25). One end of the insulating pull rod (23) is connected to the output shaft of the second operating mechanism (21), and the other end of the insulating pull rod (23) is connected to the second moving contact assembly (26). Under the drive of the second operating mechanism (21), the insulating pull rod (23) drives the second moving contact assembly (26) to rotate and cooperate with the second grounding static contact seat (24) or the connecting static contact (22).

8. The gas-insulated switchgear according to claim 1, characterized in that: The second moving contact assembly (26) includes at least one pair of oppositely arranged conductive sheets (26a) and connecting pieces (26b), one end of the conductive sheet (26a) is rotatably mounted on the central conductor of the grounding insulator (27), and the other end of the conductive sheet (26a) is connected together via a connecting beam (26c). The connecting piece (26b) is cylindrical, and a connecting arm (26d) is provided in the middle thereof for fixed connection with the connecting beam (26c). The two ends of the connecting piece (26b) are used for rotatably connecting with the insulating pull rod (23).

9. The gas-insulated switchgear according to claim 8, characterized in that: The connecting beam (26c) is located in the middle of the conductive sheet (26a) and makes the pair of conductive sheets (26a) arranged opposite to each other present an "H" shape. The gap between the two conductive sheets (26a) arranged opposite to each other is used to cooperate with the connecting static contact (22) and the second grounding static contact seat (24).

10. The gas-insulated switchgear according to claim 1, characterized in that: The combined static contact is connected to the busbar (3) in the busbar chamber (a) via a connecting busbar (4); the first operating mechanism (11) of the busbar grounding switch (1) is provided with a detachable handle, and a closable movable door is provided at the handle socket.

11. The gas-insulated switchgear according to claim 1, characterized in that: The internal space also includes a control room (b), wherein the first operating mechanism (11) of the busbar grounding switch (1) is arranged in the control room (b), and the second operating mechanism (21) of the three-position disconnector (2) is arranged in the control room (b). A first through-hole and a second through-hole are provided on the side wall between the control room (b) and the busbar room (a). A first transmission sealing device (16) is provided in the first through-hole, and the output shaft of the first operating mechanism (11) passes through the first transmission sealing device (16) to operate the first moving contact (12) in the busbar room (a); a second transmission sealing device (25) is provided in the second through-hole, and the output shaft of the second operating mechanism (21) passes through the second transmission sealing device (25) to operate the three-position disconnector (2) in the busbar room (a).

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