Gas insulation switch cabinet feeder PT grounding scheme

Abstract

The invention relates to the field of gas insulation switch cabinets, and discloses a gas insulation switch cabinet feeder PT grounding scheme, which comprises a main bus inflation compartment, the main bus inflation compartment is arranged in a switch cabinet body, a bus side three-position isolation switch is arranged in the switch cabinet body, and the bus side three-position isolation switch is arranged in the switch cabinet body. The switch cabinet body is internally provided with a circuit breaker inflation compartment, a vacuum circuit breaker, a voltage transformer, an inner cone socket, a circuit breaker lower opening branch bus, a circuit breaker upper opening branch bus, a circuit breaker lower opening branch bus and a circuit breaker lower opening branch bus. A circuit breaker side three-position isolating switch is arranged in the switch cabinet body, and an operating mechanism is arranged on the circuit breaker side three-position isolating switch. According to the invention, at the moment, the end part of the locking shaft slides into the grounding position lock hole under the action of the reset spring, and the movement process simulation is carried out through three-dimensional simulation software, so that the use effect is improved, and the three-phase synchronism is high.

Description

Technical Field

[0001] The invention relates to the technical field of gas-insulated switch cabinets, and in particular to a gas-insulated switch cabinet feeder PT grounding solution. Background Art

[0002] Box-type fixed gas-insulated switchgear usually uses low-pressure SF6 gas or environmentally friendly gas as the insulating medium of the switchgear, and uses vacuum or SF6 as the arc extinguishing medium, and centrally seals the primary components such as busbar, circuit breaker, and three-position disconnector in the box. In the feeder PT cabinet solution, the main busbar and three-position disconnector are located at the upper part of the switchgear, and the circuit breaker and voltage transformer are located at the lower part of the switchgear, and an inner cone socket is installed in the circuit breaker room, through which it is connected to the voltage transformer.

[0003] In the prior art, conventional gas-filled cabinets all use a three-position isolating switch on the bus side, and the grounding of the entire primary system is achieved by opening the circuit breaker and grounding the three-position isolating switch. There is no need to install a grounding switch in the circuit breaker chamber. In addition, the gas-filled cabinet is limited by the size of the gas chamber, and it is difficult to install another set of grounding switches in the circuit breaker chamber. Most gas-filled cabinets at home and abroad are not suitable for reliable grounding in the feeder PT scheme when the voltage transformer is repaired without power failure, that is, when the circuit breaker is in the closed state, and the three-phase synchronization is poor. Summary of the invention

[0004] The purpose of the present invention is to provide a gas insulated switchgear feeder PT grounding scheme to solve the problem that most domestic and foreign inflatable cabinets are not suitable for feeder PT schemes to achieve reliable grounding when the voltage transformer is repaired without power failure, that is, when the circuit breaker is in the closed state, and the three-phase synchronization is poor.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: a gas-insulated switchgear feeder PT grounding scheme, comprising a main busbar gas-filled compartment, the main busbar gas-filled compartment is arranged inside the switchgear body, a busbar side three-position disconnector is arranged inside the switchgear body, a circuit breaker gas-filled compartment is arranged inside the switchgear body, a vacuum circuit breaker is arranged inside the switchgear body, a voltage transformer is arranged inside the switchgear body, an inner cone socket is arranged inside the switchgear body, a circuit breaker lower branch bus is arranged inside the switchgear body, a circuit breaker side three-position disconnector is arranged inside the switchgear body, an operating mechanism is arranged on the circuit breaker side three-position disconnector, an operating shaft is rotatably arranged on one side of the operating mechanism, and a pull rod is rotatably arranged on the other end of the operating shaft Assembly, an insulating rod is rotatably provided at the other end of the pull rod assembly, and a plurality of isolation position circuit assemblies are provided on the insulating rod, the operating mechanism includes a mechanism front plate, a locking shaft is rotatably provided on the mechanism front plate, a fixed folding plate is fixed on one side of the mechanism front plate, the fixed folding plate and the locking shaft are slidably inserted, a reset spring is surrounded on the locking shaft, a hand pull rod is fixedly inserted on the locking shaft, a transmission shaft is fixed on one side of the mechanism front plate, a locking plate is fixedly inserted on the transmission shaft, a plurality of locking holes are opened on the locking plate, the locking shaft and the locking hole are slidably inserted, the operating mechanism includes a mechanism rear plate, a plurality of pillars are fixed between the mechanism front plate and the mechanism rear plate, a fixing bolt is provided at one end of the pillar, two cam plates are rotatably provided on one side of the mechanism rear plate, and a plurality of micro switches are fixed on one side of the mechanism rear plate.

[0006] Preferably, a second fixed bent plate is fixed to one end of the insulating rod, a supporting bent plate is provided at one end of the operating shaft, the pull rod assembly includes a force transmission rod, both ends of the force transmission rod are fixedly inserted with clamping blocks, a pin is slidably inserted on the clamping block, one end of the pin passes through the upper clamping block and is slidably inserted with the second fixed bent plate, a nylon sleeve is fixed to the other end of the insulating rod, and an elastic retaining ring for the shaft is slidably inserted on the locking shaft, and one side of the elastic retaining ring for the shaft is fixed to one end of the reset spring.

[0007] Preferably, the isolation position loop assembly includes a plurality of isolation knives, a second mounting hole is opened on one side of the isolation knife, the second mounting hole and the insulating rod are slidably inserted, the isolation knife is slidably inserted on the insulating rod, a plurality of cast iron sleeves are slidably inserted on the insulating rod, two of the cast iron sleeves form a group, the isolation knife is arranged between the two cast iron sleeves, and a notch is opened on one side of the isolation knife.

[0008] Preferably, the cast iron sleeve is provided with two insertion holes, the insulating rod is provided with a plurality of fifth mounting holes, a pin is slidably inserted into the insertion hole, one end of the pin passes through the insertion hole and is slidably inserted into the fifth mounting hole, the insulating rod is provided with a fourth mounting hole, and a boss is provided at one end of the insulating rod.

[0009] Preferably, two first mounting holes are opened on one side of the isolation knife, and a third mounting hole is opened on one side of the isolation knife. Bolts are rotatably inserted inside the first mounting holes, a connecting plate is fixed on the cast iron sleeve, and the connecting plate and the bolts are rotatably inserted, a fixing sleeve is fixedly inserted on the insulating rod, a fixing plate is fixed on the fixing sleeve, and a radial ball bearing is opened on one side of the fixing plate.

[0010] Preferably, a first fixed bent plate is fixed to one side of the nylon sleeve, a second fixing hole is provided on the top surface of the transverse folded surface of the first fixed bent plate, a grounding loop assembly is detachably provided on one side of the inner side of the switch cabinet body, a closed loop assembly is provided on one side of the grounding loop assembly, a plurality of first fixing holes are provided on one side of the grounding loop assembly, bolts are rotatably inserted into the inside of the second fixing hole and the first fixing hole, one end of the bolt passes through the first fixing hole and is threadedly connected to the inner wall surface of the switch cabinet body.

[0011] Preferably, the grounding loop assembly includes a grounding position fixing bent plate, which is detachably arranged on one side of the interior of the switch cabinet body, one side of the grounding position fixing bent plate is detachably provided with a grounding copper busbar, and one side of the grounding copper busbar is detachably provided with a plurality of grounding thin copper sheets.

[0012] Preferably, a grounding support busbar is detachably provided on one side of the grounding copper busbar, a closing thin copper sheet is provided on one side of the grounding support busbar, a closing copper busbar is detachably provided on the bottom surface of the closing thin copper sheet, a plurality of third fixing holes are provided on the top surface of the closing copper busbar, and bolts are rotatably inserted inside the third fixing holes.

[0013] Compared with the prior art, a gas-insulated switch cabinet feeder PT grounding scheme using the above technical solution has the following beneficial effects:

[0014] 1. First, the staff will gently pull the hand pull rod outward to drive the end of the locking shaft out of the lock hole on the lock plate, and then immediately use the operating handle to rotate the transmission shaft of the mechanism clockwise, which can drive the operating shaft and the pull rod assembly in turn, and finally drive the isolation position loop assembly to rotate to the isolation position. After rotating to the right position, the raised part of the cam plate will contact the micro switch installed at the isolation position angle. The end of the locking shaft slides into the isolation position lock hole on the lock plate under the action of the reset spring, that is, the upper lock hole, and then continue to gently pull the hand pull rod outward to drive the end of the locking shaft out of the lock hole, and then immediately use the operating handle to continue to rotate the transmission shaft clockwise, once driving the operating shaft and the pull rod assembly, and finally driving the isolation position loop assembly to rotate to the engagement position. After rotating to the engagement position, the raised part of the cam plate will press on the micro switch, and at this time, the end of the locking shaft will slide into the engagement position lock hole under the action of the reset spring, that is, the lower lock hole. The motion process is simulated by 3D simulation software, which increases the use effect and has high three-phase synchronization.

[0015] 2. When installing the isolation knife, the staff will first put the cast iron sleeve on the insulating rod, and make the central axis of the insertion hole and the fifth installation hole in the same straight line, and then the staff will pass the plug-in hole and the fifth installation hole to fix the position of the cast iron sleeve on the insulating rod, and then the staff will put the isolation knife sleeve on the insulating rod and abut against one side of the cast iron sleeve, and then the staff will put another cast iron sleeve on the insulating rod and fix the new cast iron sleeve on the other side of the isolation knife, and then use bolts to fix the isolation knife and the two connecting plates together, which increases the stability of the isolation knife position on the insulating rod;

[0016] 3. The staff uses bolts to install the grounding copper busbar, the grounding branch busbar and the grounding thin copper sheet on the grounding fixing bent plate through the mounting holes on it. There are three groups of grounding thin copper sheets, with two sheets in each group arranged symmetrically. After assembly, ensure that the gap is four millimeters to facilitate the smooth insertion of the isolation knife. After the above work is completed, the staff will fix the grounding loop assembly in the air chamber inside the switch cabinet body by welding bolts for installation, which increases the convenience of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic plan view of an embodiment.

[0018] Figure 2 It is an exploded schematic diagram of the isolation position loop assembly and the grounding loop assembly in the embodiment.

[0019] Figure 3 It is a schematic diagram of the explosion at the closed copper busbar and the closed thin copper sheet in the embodiment.

[0020] Figure 4It is a schematic diagram of the explosion of the grounding copper busbar and the grounding fixed bent plate in the embodiment.

[0021] Figure 5 It is a schematic diagram of the explosion at the connecting plate and the isolation knife in the embodiment.

[0022] Figure 6 Schematic diagram of the insulating rod in the embodiment.

[0023] Figure 7 Schematic diagram of a three-dimensional fixed plate in the embodiment.

[0024] Figure 8 It is a schematic diagram of the explosion of the clamping block and the force transmission rod in the embodiment.

[0025] Fig. 9 It is a rear view schematic diagram of the operating mechanism in the embodiment.

[0026] Fig.10 It is a front view schematic diagram of the rear plate of the mechanism in the embodiment.

[0027] In the figure: 1. Main busbar inflatable compartment; 2. Busbar side three-position disconnector; 3. Circuit breaker inflatable compartment; 4. Vacuum circuit breaker; 5. Voltage transformer; 6. Inner cone socket; 7. Circuit breaker lower branch bus; 8. Circuit breaker side three-position disconnector; 9. Operating mechanism; 10. Closing position circuit assembly; 11. First fixed bent plate; 12. Isolation position circuit assembly; 13. Grounding circuit assembly; 14. Second fixed bent plate; 15. Support bent plate; 16. Pull rod assembly; 17. Operating shaft; 18. First fixed hole; 19. Second fixed hole; 20. Closing position copper busbar; 21. Closing position thin copper sheet; 22. Grounding position copper busbar; 23. Grounding position branch busbar; 24. Grounding position fixed bent plate; 25. Grounding position thin copper sheet; 26. Nylon sleeve; 2 7. Fixed sleeve; 28. Third fixed hole; 29. ​​Insulating rod; 30. Cast iron sleeve; 31. Insertion hole; 32. Connecting plate; 33. Isolating knife; 34. Notch; 35. First mounting hole; 36. Second mounting hole; 37. Third mounting hole; 38. Fourth mounting hole; 39. Fifth mounting hole; 40. Boss; 41. Fixed plate; 42. Radial ball bearing; 43. Clamp; 44. Pin; 45. Force transmission rod; 46. Mechanism front plate; 47. Fixed folding plate; 48. Locking shaft; 49. Hand pull rod; 50. Elastic retaining ring for shaft; 51. Reset spring; 52. Locking plate; 53. Locking hole; 54. Pillar; 55. Mechanism rear plate; 56. Fixing bolt; 57. Transmission shaft; 58. Cam plate; 59. Micro switch; 60. Switch cabinet body. DETAILED DESCRIPTION

[0028] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0029] like Figure 1 , Figure 8 , Fig. 9 and Fig.10 As shown, a PT grounding scheme for feeder of a gas-insulated switch cabinet comprises a main busbar gas-filled compartment 1, the main busbar gas-filled compartment 1 is arranged inside a switch cabinet body 60, a busbar side three-position disconnector 2 is arranged inside the switch cabinet body 60, a circuit breaker gas-filled compartment 3 is arranged inside the switch cabinet body 60, a vacuum circuit breaker 4 is arranged inside the switch cabinet body 60, a voltage transformer 5 is arranged inside the switch cabinet body 60, an inner cone socket 6 is arranged inside the switch cabinet body 60, a circuit breaker lower branch bus 7 is arranged inside the switch cabinet body 60, and the switch cabinet body 60 A three-position disconnector 8 on the circuit breaker side is arranged inside, and an operating mechanism 9 is arranged on the three-position disconnector 8 on the circuit breaker side. An operating shaft 17 is rotatably arranged on one side of the operating mechanism 9, and a pull rod assembly 16 is rotatably arranged on the other end of the operating shaft 17, and an insulating rod 29 is rotatably arranged on the other end of the pull rod assembly 16, and a plurality of isolation position circuit assemblies 12 are arranged on the insulating rod 29. The operating mechanism 9 includes a mechanism front plate 46, and a locking shaft 48 is rotatably arranged on the mechanism front plate 46. A fixed folding plate 47 is fixed on one side of the mechanism front plate 46, and the fixed folding plate 47 slides with the locking shaft 48. Inserted, a reset spring 51 surrounds the locking shaft 48, a hand pull rod 49 is fixedly inserted on the locking shaft 48, a transmission shaft 57 is fixed on one side of the mechanism front plate 46, a locking plate 52 is fixedly inserted on the transmission shaft 57, a plurality of locking holes 53 are opened on the locking plate 52, the locking shaft 48 and the locking holes 53 are slidably inserted, the operating mechanism 9 includes a mechanism rear plate 55, a plurality of pillars 54 are fixed between the mechanism front plate 46 and the mechanism rear plate 55, a fixing bolt 56 is arranged at one end of the pillar 54, two cam plates 58 are rotatably arranged on one side of the mechanism rear plate 55, and one side of the mechanism rear plate 55 A plurality of micro switches 59 are fixed thereon, a second fixed bent plate 14 is fixedly arranged at one end of the insulating rod 29, a supporting bent plate 15 is arranged at one end of the operating shaft 17, the pull rod assembly 16 comprises a force transmission rod 45, both ends of the force transmission rod 45 are fixedly inserted with clamping blocks 43, a pin 44 is slidably inserted on the clamping block 43, one end of the pin 44 passes through the upper clamping block 43 and is slidably inserted with the second fixed bent plate 14, a nylon sleeve 26 is fixedly arranged at the other end of the insulating rod 29, a shaft elastic retaining ring 50 is slidably inserted on the locking shaft 48, and one side of the shaft elastic retaining ring 50 is fixed to one end of a reset spring 51.

[0030] During use, the staff will first pull the hand pull rod 49 outwards slightly to drive the end of the locking shaft 48 out of the lock hole 53 on the lock plate 52, and then immediately use the operating handle to rotate the transmission shaft 57 of the mechanism clockwise, which can drive the operating shaft 17 and the pull rod assembly 16 to move in turn, and finally drive the isolation position circuit assembly 12 to rotate to the isolation position. After rotating in place, the raised part on the cam plate 58 will contact the micro switch 59 installed at the isolation position angle, and the end of the locking shaft 48 will slide into the isolation position lock hole 53 on the lock plate 52, that is, the upper lock hole 53, under the action of the reset spring 51, and then continue Continue to gently pull the hand pull rod 49 outward to drive the end of the locking shaft 48 to disengage the lock hole 53, and then immediately continue to rotate the transmission shaft 57 clockwise with the operating handle, driving the operating shaft 17 and the pull rod assembly 16 to move at one time, and finally driving the isolation position loop assembly 12 to rotate to the engagement position. After rotating to the engagement position, the raised portion of the cam plate 58 will press on the micro switch 59. At this time, the end of the locking shaft 48 will slide into the engagement position lock hole 53 under the action of the reset spring 51, that is, the lock hole 53 below. The motion process is simulated by three-dimensional simulation software, which increases the use effect and has high three-phase synchronization.

[0031] like Figure 2 , Figure 5 , Figure 6 and Figure 7 As shown, the isolation position loop assembly 12 includes a plurality of isolation knives 33, a second mounting hole 36 is provided on one side of the isolation knife 33, the second mounting hole 36 and the insulating rod 29 are slidably inserted, the isolation knife 33 is slidably inserted on the insulating rod 29, a plurality of cast iron sleeves 30 are slidably inserted on the insulating rod 29, two cast iron sleeves 30 are formed as a group, the isolation knife 33 is arranged between the two cast iron sleeves 30, a notch 34 is provided on one side of the isolation knife 33, two insertion holes 31 are provided on the cast iron sleeve 30, a plurality of fifth mounting holes 39 are provided on the insulating rod 29, and a latch is slidably inserted on the insertion hole 31, One end of the pin passes through the insertion hole 31 and is slidably inserted with the fifth mounting hole 39, a fourth mounting hole 38 is provided on the insulating rod 29, a boss 40 is provided at one end of the insulating rod 29, two first mounting holes 35 are provided on one side of the isolating knife 33, a third mounting hole 37 is provided on one side of the isolating knife 33, a bolt is rotatably inserted inside the first mounting hole 35, a connecting plate 32 is fixed on the cast iron sleeve 30, the connecting plate 32 is rotatably inserted with the bolt, a fixing sleeve 27 is fixedly inserted on the insulating rod 29, a fixing plate 41 is fixed on the fixing sleeve 27, and a radial ball bearing 42 is provided on one side of the fixing plate 41.

[0032] During use, when installing the isolating knife 33, the staff will first put the cast iron sleeve 30 on the insulating rod 29, and make the central axis of the insertion hole 31 and the fifth mounting hole 39 in the same straight line, and then the staff will pass the pin through the insertion hole 31 and the fifth mounting hole 39 to fix the position of the cast iron sleeve 30 on the insulating rod 29, and then the staff will put the isolating knife 33 on the insulating rod 29, and it will contact one side of the cast iron sleeve 30, and then the staff will put another cast iron sleeve 30 on the insulating rod 29, and fix the new cast iron sleeve 30 on the other side of the isolating knife 33, and then use bolts to fix the isolating knife 33 and the two connecting plates 32 together, thereby increasing the stability of the position of the isolating knife 33 on the insulating rod 29.

[0033] like Figure 1-Figure 4 As shown, a first fixed bent plate 11 is fixed to one side of the nylon sleeve 26, and a second fixed hole 19 is provided on the top surface of the transverse folded surface of the first fixed bent plate 11. A grounding circuit assembly 13 is detachably provided on one side of the inner side of the switch cabinet body 60, and a closed loop assembly 10 is provided on one side of the grounding circuit assembly 13. A plurality of first fixed holes 18 are provided on one side of the grounding circuit assembly 13, and bolts are rotatably inserted in the second fixed hole 19 and the first fixed hole 18, and one end of the bolt passes through the first fixed hole 18 and is threadedly connected to the inner wall surface of the switch cabinet body 60. The grounding circuit assembly 13 includes a grounding fixed bent plate 24, a closed loop assembly 10, and a plurality of first fixed holes 18 are provided on one side of the grounding circuit assembly 13. The ground fixing bent plate 24 is detachably arranged on one side of the interior of the switch cabinet body 60, and a grounding copper busbar 22 is detachably arranged on one side of the grounding fixed bent plate 24, and a plurality of grounding thin copper sheets 25 are detachably arranged on one side of the grounding copper busbar 22, and a grounding branch busbar 23 is detachably arranged on one side of the grounding copper busbar 22, and a closing thin copper sheet 21 is arranged on one side of the grounding branch busbar 23, and a closing copper busbar 20 is detachably arranged on the bottom surface of the closing thin copper sheet 21, and a plurality of third fixing holes 28 are opened on the top surface of the closing copper busbar 20, and bolts are rotatably inserted inside the third fixing holes 28.

[0034] During use, the staff uses bolts to install the grounding copper busbar 22, the grounding branch busbar 23 and the grounding thin copper sheet 25 on the grounding fixing bent plate 24 through the upper mounting holes at one time. The grounding thin copper sheets 25 are divided into three groups, with two sheets in each group arranged symmetrically. After assembly, a gap of four millimeters is ensured to facilitate the smooth insertion of the isolation knife 33. After the above work is completed, the staff will fix the grounding loop assembly 13 in the air chamber inside the switch cabinet body 60 by welding bolts for installation, which increases the convenience of installation.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gas-insulated switchgear feeder PT grounding scheme, comprising a main busbar gas-filled compartment (1), wherein the main busbar gas-filled compartment (1) is arranged inside a switchgear body (60), characterized in that: The switch cabinet body (60) is provided with a busbar-side three-position isolating switch (2), the switch cabinet body (60) is provided with a circuit breaker air-filled compartment (3), the switch cabinet body (60) is provided with a vacuum circuit breaker (4), the switch cabinet body (60) is provided with a voltage transformer (5), the switch cabinet body (60) is provided with an inner cone socket (6), the switch cabinet body (60) is provided with a circuit breaker lower branch bus (7), and the switch cabinet body ( 60) is provided with a three-position isolating switch (8) on the circuit breaker side, and an operating mechanism (9) is provided on the three-position isolating switch (8) on the circuit breaker side. An operating shaft (17) is rotatably provided on one side of the operating mechanism (9), and a pull rod assembly (16) is rotatably provided on the other end of the operating shaft (17), and an insulating rod (29) is rotatably provided on the other end of the pull rod assembly (16), and a plurality of isolating position circuit assemblies (12) are provided on the insulating rod (29). The operating mechanism (9) includes a mechanism A front plate (46), a locking shaft (48) is rotatably provided on the front plate (46) of the mechanism, a fixed folding plate (47) is fixed on one side of the front plate (46) of the mechanism, the fixed folding plate (47) and the locking shaft (48) are slidably inserted, a return spring (51) is surrounded on the locking shaft (48), a hand pull rod (49) is fixedly inserted on the locking shaft (48), a transmission shaft (57) is fixed on one side of the front plate (46) of the mechanism, a locking plate (52) is fixedly inserted on the transmission shaft (57), and the locking plate A plurality of locking holes (53) are provided on (52), the locking shaft (48) and the locking hole (53) are slidably inserted, the operating mechanism (9) includes a mechanism rear plate (55), a plurality of pillars (54) are fixed between the mechanism front plate (46) and the mechanism rear plate (55), one end of the pillar (54) is provided with a fixing bolt (56), one side of the mechanism rear plate (55) is rotatably provided with two cam plates (58), and one side of the mechanism rear plate (55) is fixed with a plurality of micro switches (59).

2. A gas-insulated switchgear feeder PT grounding scheme according to claim 1, characterized in that: A second fixed bent plate (14) is fixed to one end of the insulating rod (29), a supporting bent plate (15) is provided at one end of the operating shaft (17), the pull rod assembly (16) includes a force transmission rod (45), both ends of the force transmission rod (45) are fixedly inserted with clamping blocks (43), a pin (44) is slidably inserted on the clamping block (43), one end of the pin (44) passes through the upper clamping block (43) and is slidably inserted with the second fixed bent plate (14), a nylon sleeve (26) is fixed to the other end of the insulating rod (29), a shaft elastic retaining ring (50) is slidably inserted on the locking shaft (48), and one side of the shaft elastic retaining ring (50) is fixed to one end of a reset spring (51).

3. A gas-insulated switchgear feeder PT grounding scheme according to claim 1, characterized in that: The isolation position loop assembly (12) comprises a plurality of isolation knives (33), a second mounting hole (36) is provided on one side of the isolation knife (33), the second mounting hole (36) is slidably inserted with the insulating rod (29), the isolation knife (33) is slidably inserted on the insulating rod (29), a plurality of cast iron sleeves (30) are slidably inserted on the insulating rod (29), two of the cast iron sleeves (30) form a group, the isolation knife (33) is arranged between the two cast iron sleeves (30), and a notch (34) is provided on one side of the isolation knife (33).

4. A gas-insulated switchgear feeder PT grounding scheme according to claim 3, characterized in that: The cast iron sleeve (30) is provided with two insertion holes (31), the insulating rod (29) is provided with a plurality of fifth mounting holes (39), a plug is slidably inserted into the insertion hole (31), one end of the plug passes through the insertion hole (31) and is slidably inserted into the fifth mounting hole (39), the insulating rod (29) is provided with a fourth mounting hole (38), and a boss (40) is provided at one end of the insulating rod (29).

5. A gas-insulated switchgear feeder PT grounding scheme according to claim 3, characterized in that: Two first mounting holes (35) are provided on one side of the isolation knife (33), a third mounting hole (37) is provided on one side of the isolation knife (33), a bolt is rotatably inserted inside the first mounting hole (35), a connecting plate (32) is fixed on the cast iron sleeve (30), the connecting plate (32) and the bolt are rotatably inserted, a fixing sleeve (27) is fixedly inserted on the insulating rod (29), a fixing plate (41) is fixed on the fixing sleeve (27), and a radial ball bearing (42) is provided on one side of the fixing plate (41).

6. A gas-insulated switchgear feeder PT grounding scheme according to claim 2, characterized in that: A first fixed bent plate (11) is fixed to one side of the nylon sleeve (26), and a second fixing hole (19) is provided on the top surface of the transverse folded surface of the first fixed bent plate (11). A grounding circuit assembly (13) is detachably provided on one side of the interior of the switch cabinet body (60), and a closing circuit assembly (10) is provided on one side of the grounding circuit assembly (13). A plurality of first fixing holes (18) are provided on one side of the grounding circuit assembly (13), and bolts are rotatably inserted into the interior of the second fixing hole (19) and the first fixing hole (18), and one end of the bolt passes through the first fixing hole (18) and is threadedly connected to the inner wall surface of the switch cabinet body (60).

7. A gas-insulated switchgear feeder PT grounding scheme according to claim 6, characterized in that: The grounding loop assembly (13) comprises a grounding position fixing bent plate (24), the grounding position fixing bent plate (24) is detachably arranged on one side of the interior of the switch cabinet body (60), a grounding position copper busbar (22) is detachably arranged on one side of the grounding position fixing bent plate (24), and a plurality of grounding position thin copper sheets (25) are detachably arranged on one side of the grounding position copper busbar (22).

8. A gas-insulated switchgear feeder PT grounding scheme according to claim 7, characterized in that: A grounding support busbar (23) is detachably provided on one side of the grounding copper busbar (22), a closing thin copper sheet (21) is provided on one side of the grounding support busbar (23), a closing copper busbar (20) is detachably provided on the bottom surface of the closing thin copper sheet (21), a plurality of third fixing holes (28) are provided on the top surface of the closing copper busbar (20), and bolts are rotatably inserted inside the third fixing holes (28).

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