Sulfur hexafluoride insulated ring main unit with test head

Abstract

The application relates to the technical field of switch devices, in particular to a six-fluoride sulfur insulated ring network cabinet with a test head, which comprises a connecting cabinet fixedly connected to a cabinet body, a connector A fixedly connected in the connecting cabinet, a mounting plate fixedly connected in the cabinet body, a connector B fixedly connected to the cabinet body, a mounting frame fixedly connected to the mounting plate, a contact A fixedly connected to the mounting frame, a test cabinet fixedly connected to the cabinet body, a test head fixedly connected to the mounting plate, a contact B fixedly connected to the mounting frame, a cross frame fixedly connected to the mounting plate, a cutter seat fixedly connected to the cross frame and an isolation cutter rotatably connected to the cutter seat. The test cabinet is arranged in the application, the isolation cutter is rotated to realize quick opening and closing switching, the cable can be regularly tested without disassembling the cable head, the cable head does not need to be frequently plugged and unplugged, the loss of the related components of the application is reduced, and the stability of the whole power system is ensured.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and more specifically to a sulfur hexafluoride insulated ring main unit with a test head. Background Technology

[0002] As an important power distribution device in the power system, the sulfur hexafluoride ring main unit plays a vital role in the power transmission and distribution process. Therefore, its regular inspection and maintenance are of great significance to ensuring the safety and stability of the power system.

[0003] When performing regular maintenance on sulfur hexafluoride (SF6) ring main units, it is necessary to disassemble the cable heads for testing. Over time, such frequent operations will cause the cable head joints to gradually loosen, resulting in high wear on the components at the joints of the SF6 ring main unit. This poses a potential threat to the normal operation of the SF6 ring main unit and, in turn, affects the stability of the entire power system. Summary of the Invention

[0004] In view of the technical defects mentioned in the background art, the present invention proposes a sulfur hexafluoride insulated ring main unit with a test head that does not require testing of cable heads.

[0005] A sulfur hexafluoride insulated ring main unit with a test head includes: a cabinet;

[0006] A connecting cabinet that is fixedly attached to the cabinet body;

[0007] Connector A is fixedly connected inside the connection cabinet;

[0008] A mounting plate is fixedly connected to the cabinet, and the mounting plate divides an independent space inside the cabinet, the space being filled with sulfur hexafluoride;

[0009] Connector B is fixedly connected to the cabinet.

[0010] A mounting bracket that is fixedly connected to the mounting plate;

[0011] Contact A is fixedly connected to the mounting bracket, and contact A is electrically connected to connector B;

[0012] A test cabinet that is fixedly connected to the cabinet body;

[0013] The test head is fixedly connected to the mounting plate and is electrically connected to the test cabinet;

[0014] Contact B is fixedly connected to the mounting bracket, and contact B is electrically connected to the test head;

[0015] A crossbar fixedly connected to the mounting plate;

[0016] A tool holder is fixedly connected to the crossbar and is electrically connected to connector A; an isolating blade is rotatably connected to the tool holder, and the rotation of the isolating blade will electrically connect to contact A / contact B.

[0017] More preferably, it also includes: a control cabinet fixedly connected to the cabinet body;

[0018] A mount that is fixedly installed inside the control cabinet;

[0019] Rotary shaft A connects the mounter and the mounting bracket;

[0020] Rotary bracket C, which is rotatably connected to shaft A, has its end rotatably connected to the isolation knife.

[0021] More preferably, it also includes: a rotating handle rotatably connected to the installer, of which two handles are provided; and an eccentric plate A fixedly connected to the rotating handle;

[0022] A V-shaped rotating plate is fixedly connected to the rotating shaft A;

[0023] Connecting arms that slide and rotate between each eccentric plate A and V rotating plate respectively;

[0024] Eccentric plates B are fixedly connected to the two rotating handles respectively;

[0025] A connecting column that rotates between the eccentric parts of the two eccentric plates B;

[0026] Spring A is fixedly connected between two eccentric plates B.

[0027] More preferably, it also includes a one-way operating handle.

[0028] More preferably, the one-way operating handle includes: a central shaft;

[0029] A rotating rod is fixedly connected to the central shaft, and the rotating rod is perpendicular to the central shaft;

[0030] One-way bearings are fixedly connected to the upper and lower ends of the central shaft;

[0031] The inner angle cylinder is rotatably connected to the one-way bearing, and the inner angle cylinder is engaged with the handle.

[0032] More preferably, it also includes: a circuit breaker cabinet fixedly connected to the cabinet body, with an installer fixedly connected inside the circuit breaker cabinet;

[0033] A circuit breaker fixedly connected to a mounting plate, the circuit breaker being electrically connected to contact A;

[0034] The control terminal is slidably connected to the circuit breaker;

[0035] Rotate the shaft B connected to the mount;

[0036] An on / off cam is fixedly connected to the rotating shaft B, and the on / off cam is connected to the control terminal.

[0037] More preferably, it also includes: a gear shaft fixedly connected to the rotating shaft A;

[0038] Rotate the baffle A connected to the mounter;

[0039] A toothed plate is fixedly connected to the end of baffle A, and the toothed plate meshes with the toothed shaft.

[0040] More preferably, it also includes: a top block fixedly connected to the rotating shaft B;

[0041] A sliding plate connected to the installer;

[0042] Baffle B is fixedly connected to the movable plate;

[0043] Spring B is fixedly connected between the mounter and the moving plate.

[0044] The beneficial effects of this invention are:

[0045] Using this invention, a test cabinet is installed inside, and the switching on and off can be quickly achieved by rotating the isolating blade. This allows for routine cable testing without disassembling the cable head, thereby eliminating the need for frequent plugging and unplugging of the cable head, reducing the wear and tear on the components of this invention, and ultimately ensuring the stability of the entire power system.

[0046] Using this invention, by setting two rotary handles to control the opening and closing of the isolating knife, the repeated misoperation of the isolating knife is prevented, thereby improving the safety of the switchgear.

[0047] Using this invention, in conjunction with a one-way operating handle, can directly avoid repeated misoperations during the operation of the handle, further improving the reliability of the handle in controlling the rotation of the isolation knife.

[0048] By using this invention, and by setting baffle A and baffle B, when using one of the mechanisms / components of this invention, it is possible to restrict another mechanism / component to prevent misuse of other mechanisms / components and thus improve the safety of using this invention. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the appearance of the present invention.

[0050] Figure 2 This is a schematic diagram of the internal structure of the present invention.

[0051] Figure 3 This is a schematic diagram of the internal structure of the present invention from a rear view.

[0052] Figure 4 This is a schematic diagram of the connection structure of the conductive contact plate A, connector B, contact A, and sub-terminal A of the present invention.

[0053] Figure 5 This is a schematic diagram of the connection structure of the test cabinet, test head, contact B and sub-terminal B of the present invention.

[0054] Figure 6 This is a schematic diagram of the connection structure of connector A, knife holder, sub-end C and isolation knife of the present invention.

[0055] Figure 7 This is a schematic diagram showing the position and structure of contact A, contact B, knife holder, and isolation knife of the present invention.

[0056] Figure 8 This is a schematic diagram of the structure of the isolation blade of the present invention when it is adjusted to contact contact A.

[0057] Figure 9 This is a schematic diagram of the structure of the isolating blade of the present invention when it is adjusted to contact the contact B.

[0058] Figure 10 This is a schematic diagram of the connection structure between the two rotating handles and the rotating shaft A of the present invention.

[0059] Figure 11 This is a schematic diagram of the connection structure of the one-way handle in this invention.

[0060] Figure 12 This is a schematic diagram of the location and structure of the circuit breaker of the present invention.

[0061] Figure 13 This is a schematic diagram of the connection structure of the control terminal, rotating shaft B, and the switching cam of the present invention.

[0062] Figure 14 This is a schematic diagram of the connection structure of baffle A of the present invention.

[0063] Figure 15 This is a schematic diagram of the connection structure of the baffle B of the present invention.

[0064] The labels in the attached diagram are as follows: 1. Cabinet; 2. Control cabinet; 3. Connection cabinet; 4. Connector A; 5. Cable head; 6. Test cabinet; 7. Circuit breaker cabinet; 8. Mounting plate; 9. Conductive contact plate A; 10. Connector B; 11. Mounting bracket; 12. Contact A; 13. Sub-terminal A; 14. Conductive contact plate B; 15. Test head; 16. Conductive contact plate C; 17. Contact B; 18. Sub-terminal B; 19. Conductive contact plate D; 20. Crossbar; 21. Knife holder; 22. Sub-terminal C; 23. Isolating knife; 24. Conductive wiring; 25. 26. Mounting device, 27. Shaft A, 28. C-shaped frame, 29. Rotating handle, 30. Eccentric plate A, 31. V-shaped rotating plate, 32. Connecting arm, 33. Eccentric plate B, 34. Connecting column, 35. Spring A, 36. Central shaft, 37. Rotating rod, 38. One-way bearing, 39. Inner angle rotating cylinder, 40. Circuit breaker, 41. Control terminal, 42. Shaft B, 43. Opening cam, 44. Control board, 45. Gear shaft, 46. Baffle A, 47. Gear plate, 48. Top block, 49. Moving plate, 50. Baffle B. Detailed Implementation

[0065] It should be noted that the technical solutions of the present invention will be described in detail and completely below with reference to the accompanying drawings and the markings in the drawings. However, the described content is only one embodiment of the technical solutions of the present invention and cannot cover all the contents of the present invention. Therefore, any embodiments derived from the embodiments given in the present invention that are obtained by those skilled in the art without substantial creation will fall within the protection scope of the present invention.

[0066] Example: Combining Figures 1-2 As shown, it includes: a cabinet 1; a control cabinet 2 fixedly installed on the front side of the cabinet 1, the control cabinet 2 being located in the middle of the cabinet 1; a connection cabinet 3 fixedly installed on the bottom of the cabinet 1; a connector A4 fixedly installed inside the connection cabinet 3, the connector A4 being used to connect cable heads 5; a test cabinet 6 fixedly installed on the front side of the cabinet 1, the test cabinet 6 being located in the upper part of the cabinet 1; and a circuit breaker cabinet 7 fixedly installed on the front side of the cabinet 1, the circuit breaker cabinet 7 being located in the upper middle part of the cabinet 1; the control cabinet 2, the connection cabinet 3, the test cabinet 6, and the circuit breaker cabinet 7 are all equipped with openable and closable cabinet doors for convenient use of each functional cabinet.

[0067] Combination Figure 3 , Figure 4 , Figure 7 , Figure 8 and Figure 9As shown, it also includes: a mounting plate 8 fixedly installed inside the cabinet 1, the mounting plate 8 being located behind the control cabinet 2, connection cabinet 3, test cabinet 6, and circuit breaker cabinet 7, with an independent space partitioned off at the rear of the cabinet 1, the space being filled with sulfur hexafluoride for insulation protection; a conductive contact plate A9 fixedly installed on the top of the cabinet 1, the conductive contact plate A9 being located within the space; connectors B10 fixedly installed on both sides of the conductive contact plate A9, through which two ring main units can be interconnected to form a ring main line, or the ring main units can be directly connected to power distribution equipment; a mounting bracket 11 fixedly installed on the back of the mounting plate 8; a contact A12 fixedly installed on the mounting bracket 11, the contact A12 being provided with a sub-terminal A13 for connection, and an arc suppression coil being provided on the contact A12 for its protection; and a conductive contact plate B14 fixedly installed between the conductive contact plate A9 and the contact A12, the conductive contact plate B14 being electrically connected to the contact A12 and the connector B10.

[0068] Combination Figure 3 , Figure 5 , Figure 7 , Figure 8 and Figure 9 As shown, it also includes: a test head 15 fixedly installed on the back of the mounting plate 8, the test head 15 passing through the mounting plate 8 and electrically connected to the test cabinet 6; a conductive contact plate C16 fixedly installed on the test head 15; a contact B17 fixedly installed on the mounting bracket 11, the contact B17 being provided with a sub-terminal B18 for connection; and a conductive contact plate D19 fixedly installed between the conductive contact plate C16 and the contact B17, the conductive contact plate D19 and the conductive contact plate C16 being electrically connected to the contact B17 and the test head 15.

[0069] Combination Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, it also includes: a crossbeam 20 fixedly mounted on the back side of the mounting plate 8; a knife holder 21 fixedly mounted on the crossbeam 20, the knife holder 21 being provided with a sub-terminal C22 for connection; an isolating knife 23 rotatably mounted on the sub-terminal C22, the rotation of the isolating knife 23 electrically connecting to the sub-terminal A13 of contact A12 or the sub-terminal B18 of contact B17; and a conductive wire 24 fixedly mounted between connector A4 and knife holder 21, the conductive wire 24 electrically connecting knife holder 21 and connector A4, after the cable head 5 is connected to connector A4, it will conduct electricity to knife holder 21, and through the rotation of isolating knife 23, it will switch to finally conduct electricity to connector B10 / test head 15.

[0070] Combination Figure 2 , Figure 3 and Figure 10As shown, it also includes: a mount 25 fixedly installed inside the control cabinet 2; a rotating shaft A26 rotatably installed between the mount 25 and the mounting bracket 11, the rotating shaft A26 passing through the mounting plate 8 and rotatably connected to the mounting plate 8 using a bearing, an insulating section is provided on the rotating shaft A26 near the mounting plate 8 to prevent leakage of current into the control cabinet 2 and improve the operational safety of the ring main unit; and a C-rotor 27 rotatably installed on the rotating shaft A26, the end of the C-rotor 27 being rotatably installed with the isolating knife 23, so that the rotation of the rotating shaft A26 can control the rotation of the isolating knife 23.

[0071] Combination Figure 10 As shown, it also includes: two rotating handles 28 rotatably mounted on the mounter 25; an eccentric plate A29 fixedly mounted on the rotating handle 28; a V-shaped rotating plate 30 fixedly mounted on the front end of the rotating shaft A26; and connecting arms 31 slidably and rotatably mounted between the two eccentric plates A29 and the V-shaped rotating plate 30, so that both rotating handles 28 can control the rotation of the rotating shaft A26. One of the rotating handles 28 is used to control the isolating knife 23 to cut in the open state when not connected to any contact and in the closed state when connected to the contact A12. Alternatively, another handle 28 is used to control the switching of the isolating knife 23 in the open state and the grounding state connected to the contact B17; eccentric plates B32 are fixedly installed on the two handles 28 respectively; a connecting post 33 is rotatably installed between the eccentric parts of the two eccentric plates B32, and the connecting post 33 is a telescopic rod structure; a spring A34 is fixedly installed between the two eccentric plates B32, and the spring A34 is sleeved on the connecting post 33. The spring A34 will cause the other eccentric plate B32 to rotate synchronously when one eccentric plate B32 rotates.

[0072] Combination Figure 11 As shown, it also includes: a one-way operating handle for controlling the rotation of the handle 28, the one-way operating handle including: a central shaft 35; a rotating rod 36 fixedly installed on the central shaft 35, the rotating rod 36 being perpendicular to the central shaft 35; one-way bearings 37 fixedly installed at the upper and lower ends of the central shaft 35; and an inner angle rotating cylinder 38 rotatably installed on the one-way bearing 37, the inner angle rotating cylinder 38 cooperating with the handle 28.

[0073] Combination Figure 3 and Figure 12As shown, it also includes: a circuit breaker 39 fixedly installed on the back side of the mounting plate 8, the circuit breaker 39 being electrically connected to the contact A12; a control terminal 40 slidably installed on the circuit breaker 39, the control terminal 40 moving up and down to control the opening and closing of the circuit breaker 39; a rotating shaft B41 rotatably installed on the mounting device 25, the rotating shaft B41 passing through the mounting plate 8 and being rotatably connected to the mounting plate 8 using bearings, the rotating shaft B41 being an insulated shaft; an opening cam 42 fixedly installed on the opening cam 42, the opening cam 42 being provided with an arc-shaped track, the two ends of the track being at different distances from the rotating shaft B41, the upper part of the control terminal 40 being slidably installed in the arc-shaped track on the opening cam 42; and a control plate 43 fixedly installed on the front end of the rotating shaft B41, the control plate 43 being used to control the rotation of the rotating shaft B41.

[0074] Combination Figure 2 and Figure 14 As shown, it also includes: a gear shaft 44 fixedly installed on the front side of the rotating shaft A26; a baffle A45 rotatably installed on the mounter 25; and a gear plate 46 fixedly installed on the end of the baffle A45, the gear plate 46 meshing with the gear shaft 44, so that when one of the handles 28 is used to rotate the rotating shaft A26, the control baffle A45 will block the front side of the other handle 28.

[0075] Combination Figures 2-15 As shown, it also includes: a top block 47 fixedly installed at the front end of the rotating shaft B41; a movable plate 48 slidably installed on the mounter 25; a baffle B49 fixedly installed at the bottom of the movable plate 48; and a spring B50 fixedly installed between the mounter 25 and the movable plate 48, which blocks the control baffle B49 in front of the handle 28 when the control shaft B41 activates the circuit breaker 39.

[0076] Working principle:

[0077] 1. In the ring main unit, a one-way operating handle 28 is used: First, insert the inner angle cylinder 38 onto the handle 28, then rotate the rod 36. When the rotation direction is opposite to the direction of the one-way bearing 37, the central shaft 35 will not rotate relative to the inner angle cylinder 38. Therefore, rotating the rod 36 can control the rotation of the handle 28. During the process, if the rod 36 is rotated in the opposite direction due to an operational error, the direction will be in the same direction as the rotation of the one-way bearing 37. Therefore, the central shaft 35 will rotate relative to the inner angle cylinder 38, causing the central shaft 35 to enter free rotation. Then, the inner angle cylinder 38 and the handle 28 will not be driven to rotate in the opposite direction. This allows the handle 28 to rotate stably in the same rotation direction. Since the isolation knife 23 cannot be observed during operation, using a one-way operating handle can prevent rotation errors caused by mistakes, thereby preventing them from affecting the judgment of controlling the rotation of the handle 28.

[0078] 2. Combining Figure 10When the control handle 28 rotates: A clockwise rotation of the right-side handle 28 pushes the connecting arm 31 down via the eccentric plate A29, causing the V-plate 30 to rotate counter-clockwise, controlling the rotating shaft A26 to rotate counter-clockwise, and controlling the isolating blade 23 to rotate to the open state; a counter-clockwise rotation of the right-side handle 28 pulls the connecting arm 31 up, causing the V-plate 30 to rotate clockwise, controlling the rotating shaft A26 to rotate clockwise, and controlling the isolating blade 23 to rotate from the open state to the closed state; a clockwise rotation of the left-side handle 28 pulls the connecting arm 31 to the left via the eccentric plate A29, causing the V-plate 30 to rotate clockwise, controlling the rotating shaft A26 to rotate clockwise, and controlling the isolating blade 23 to rotate to the open state; a counter-clockwise rotation of the left-side handle 28 pushes the connecting arm 31 to the right, causing the V-plate 30 to rotate counter-clockwise, controlling the rotating shaft A26 to rotate counter-clockwise, and controlling the isolating blade 23 to rotate from the open state to the grounded state.

[0079] During the process of controlling the rotation of the two handles 28 respectively, the rotation of one eccentric plate A29 will compress the spring A34 to deform, and the deformation of the spring A34 will compress the other eccentric plate A29 to rotate. Therefore, the spring A34 quickly recovers its deformation, thereby driving the actively rotating eccentric plate A29 to quickly rotate to the target position, thus realizing rapid opening and closing of the circuit breaker.

[0080] During the rotation of the handle 28, when one handle 28 rotates the shaft A26, the cooperation between the gear shaft 44 and the gear plate 46 will block the control baffle A45 in front of the other handle 28. In this way, when operating the handle 28, it is not easy to confuse the two handles 28, and thus it is not easy to confuse the rotation state of the shaft A26 controlling the isolation knife 23.

[0081] 3. Combining Figure 12 When the control panel 43 rotates the rotating shaft B41, the control terminal 40 will move upward when the rotating shaft B41 and the breaking cam 42 rotate clockwise, thus opening the circuit breaker 39; and when the rotating shaft B41 and the breaking cam 42 rotate counterclockwise, the control terminal 40 will move downward, thus closing the circuit breaker 39.

[0082] When the rotating shaft B41 controls the closing of the circuit breaker 39, the rotating top block 47 presses the moving plate 48 downward, the spring B50 is stretched, and the baffle B49 is moved to block the handle 28. Conversely, when the top block 47 reverses, the spring B50 moves the moving plate 48 upward and the baffle B49 moves upward, thus canceling the control of the baffle B49 blocking the handle 28. The baffle B49 is provided to prevent the control of the handle 28 when the circuit breaker 39 is closed, in order to prevent electrical interference.

[0083] When testing a ring main unit is required, the operating sequence should be as follows:

[0084] Rotate the right-hand handle 28 counterclockwise to control the shaft A26 to rotate clockwise, thereby closing the isolating switch 23. After completion, rotate the shaft B41 counterclockwise to close the circuit breaker 39. At this point, the ring main unit has completed the closing action and can be tested. If continued use is required after testing, rotate the shaft B41 clockwise to open the circuit breaker 39. Then, rotate the right-hand handle 28 clockwise to control the shaft A26 to rotate counterclockwise, thereby opening the isolating switch 23. Finally, when the isolating switch 23 is open, rotate the left-hand handle 28 counterclockwise to rotate the shaft A26 counterclockwise to ground the isolating switch 23.

[0085] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A sulfur hexafluoride insulated ring main unit with a test head, characterized in that, include: Cabinet (1); A connecting cabinet (3) is fixedly connected to the cabinet body (1); Connector A (4) is fixedly connected inside the connection cabinet (3) for connecting cable heads (5); A mounting plate (8) is fixedly connected inside the cabinet (1). The mounting plate (8) divides an independent space inside the cabinet (1), which is filled with sulfur hexafluoride for insulation protection. Connector B (10) is fixedly connected to the cabinet (1) for connecting power distribution equipment / another ring network cabinet. Mounting bracket (11) is fixedly connected to mounting plate (8); Contact A (12) is fixedly connected to the mounting bracket (11), and contact A (12) is electrically connected to connector B (10); Test cabinet (6) is fixedly connected to the cabinet (1); The test head (15) is fixedly connected to the mounting plate (8) and electrically connected to the test cabinet (6); Contact B (17) is fixedly connected to the mounting bracket (11), and contact B (17) is electrically connected to the test head (15); A crossbar (20) is fixedly connected to the mounting plate (8); A tool holder (21) is fixedly connected to the crossbar (20), and the tool holder (21) is electrically connected to connector A (4); Rotate the isolating knife (23) connected to the knife holder (21). The rotation of the isolating knife (23) will make it electrically connected to contact A (12) / contact B (17); It also includes: a control cabinet (2) that is fixedly connected to the cabinet (1); Installer (25) fixedly installed inside the control cabinet (2); Rotary shaft A (26) is rotatably connected between the mount (25) and the mounting bracket (11); Rotary C-frame (27) is rotatably connected to rotating shaft A (26), and the end of rotating C-frame (27) is rotatably connected to isolation blade (23); It also includes: a rotating handle (28) connected to the mount (25), and there are two rotating handles (28); An eccentric plate A (29) is fixedly connected to the handle (28); V-shaped rotating plate (30) is fixedly connected to the rotating shaft A (26); Connecting arms (31) that slide and rotate between each eccentric plate A (29) and V rotating plate (30); Eccentric plates B (32) are fixedly connected to the two rotating handles (28) respectively; Rotary connection column (33) between the eccentric parts of the two eccentric plates B (32); Spring A (34) is fixedly connected between two eccentric plates B (32).

2. The sulfur hexafluoride insulated ring main unit with a test head according to claim 1, characterized in that, Also includes: A one-way operating handle for controlling the rotation of the handle (28).

3. A sulfur hexafluoride insulated ring main unit with a test head according to claim 2, characterized in that, The one-way operating handle includes: a central shaft (35); A rotating rod (36) is fixedly connected to the central shaft (35), and the rotating rod (36) is perpendicular to the central shaft (35); One-way bearings (37) are fixedly connected to the upper and lower ends of the central shaft (35); The inner angle cylinder (38) is rotatably connected to the one-way bearing (37), and the inner angle cylinder (38) is engaged with the handle (28).

4. A sulfur hexafluoride insulated ring main unit with a test head according to claim 3, characterized in that, Also includes: A circuit breaker (7) is fixedly connected to the cabinet (1), and an installer (25) is fixedly connected inside the circuit breaker (7). A circuit breaker (39) is fixedly connected to the mounting plate (8), and the circuit breaker (39) is electrically connected to the contact A (12); A sliding connection is made to the control terminal (40) of the circuit breaker (39) for controlling the opening and closing of the circuit breaker (39). Rotate the shaft B (41) connected to the mount (25); An opening cam (42) is fixedly connected to the rotating shaft B (41). The opening cam (42) is connected to the control terminal (40). The opening cam (42) rotates to cause the control terminal (40) to open and close the circuit breaker (39).

5. A sulfur hexafluoride insulated ring main unit with a test head according to claim 4, characterized in that, Also includes: A gear shaft (44) is fixedly connected to the rotating shaft A (26); A baffle A (45) is rotatably connected to the mount (25) to block the handle (28); A toothed plate (46) is fixedly connected to the end of the baffle A (45), and the toothed plate (46) meshes with the toothed shaft (44).

6. A sulfur hexafluoride insulated ring main unit with a test head according to claim 5, characterized in that, Also includes: Top block (47) is fixedly connected to the rotating shaft B (41). A sliding plate (48) is slidably connected to the installer (25); A baffle B (49) is fixedly connected to the movable plate (48) to block the rotating handle (28). Spring B (50) is fixedly connected between the mount (25) and the movable plate (48).

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