Low-voltage current transformer for state grid metering

Abstract

The invention discloses a state grid metering low-voltage current transformer, and relates to the technical field of current transformers, the state grid metering low-voltage current transformer comprises a fixed part, the top of the fixed part is fixedly connected with a mounting seat, the top of the mounting seat is fixedly connected with an iron core, one side of the mounting seat is fixedly connected with two wiring terminals, and the two wiring terminals are fixedly connected with a power supply. The low-voltage current transformer for state grid metering is provided with the fixing sleeves, the sealing sleeves and the rotating sleeves, the connecting positions of the wiring ends, the connecting rings and the connecting wires can be sealed, the connecting rings can be connected with the connecting wires, the connecting rings can be connected with the connecting wires, and the connecting wires can be connected with the connecting rings in a sliding mode, so that the stability of the state grid metering is improved. And air in the fixed sleeve, the rotating sleeve and the sealing sleeve is exhausted and is exhausted into inert gas to protect the connecting part of the wiring end, the connecting ring and the connecting wire, and meanwhile, the extending angle of the connecting wire can be adjusted through the rotatable rotating sleeve, so that the current transformer is convenient to use.

Description

Technical Field

[0001] The invention relates to the technical field of current transformers, in particular to a low-voltage current transformer for national grid metering. Background Art

[0002] A low voltage current transformer is a device that can convert high AC current into an easily controllable low current, and has the characteristics of excellent performance and stable accuracy. There are many varieties of low voltage transformers. The more common ones are LMZ (including LMZJ) series, LMK (including BH) series, SDH series, LQZ series, AKH series, etc., which are commonly used in voltage levels such as 0.5kv and 0.66kv, with an accuracy of 0.5, 0.5s, 0.2, 0.2s, etc. The primary input is 20~6000A and the secondary output is 1A or 5A, which is suitable for measurement or protection. The connection between the terminal and the wire of the low voltage current transformer in the prior art is exposed to the outside, which is prone to oxidation, causing corrosion at the connection between the terminal and the wire, affecting the connection between the terminal and the wire. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a low-voltage current transformer for national grid metering, which solves the problems raised in the above-mentioned background technology.

[0004] To achieve the above purpose, the present invention is implemented by the following technical scheme: a low-voltage current transformer for national grid metering, comprising a fixing member, a mounting seat is fixedly connected to the top of the fixing member, an iron core is fixedly connected to the top of the mounting seat, two wiring terminals are fixedly connected to one side of the mounting seat, a fixing sleeve is fixedly connected to one side of the mounting seat and located on the outside of the wiring terminal, a rotating sleeve is slidably connected to one side of the fixing sleeve, a sealing sleeve is placed on one side of the rotating sleeve, a plurality of slots are provided on one side of the sealing sleeve, a plug-in block is fixedly connected to one side of the rotating sleeve, one end of the plug-in block extends to the inside of the slot, a driving box is fixedly connected to the surface of the sealing sleeve and one end of the plug-in block, a threaded column is rotatably connected to the inside of the driving box, a positioning block is threadedly connected to the outside of the threaded column, one end of the positioning block extends to the inside of the plug-in block, a connecting ring is sleeved on the outside of the wiring terminal, a screw is threadedly connected to the inside of the wiring terminal, a connecting wire is fixedly connected to one end of the connecting ring, and a matching sealing groove is provided on one side of the rotating sleeve and the sealing sleeve.

[0005] Optionally, the outer side of the threaded column is fixedly sleeved with a worm wheel, the inside of the drive box is rotatably connected to a worm, the worm is drivingly connected to the worm wheel, the outer side of the sealing sleeve is slidably connected to a first sliding sleeve, the outer side of the first sliding sleeve is fixedly connected to a second sliding sleeve, the inner cavity of the second sliding sleeve is fixedly connected to a gear ring, one end of the worm extends into the interior of the second sliding sleeve and is fixedly sleeved with a third transmission gear matching the gear ring.

[0006] Optionally, the bottom of the sealing sleeve is fixedly connected to a connecting box, a second piston chamber is opened inside the connecting box, a driving groove is opened inside the connecting box and at one end of the second piston chamber, a reciprocating threaded rod is rotatably connected inside the driving groove, a piston block is threadedly connected to the outer side of the reciprocating threaded rod, one end of the piston block extends to the second piston chamber and cooperates with the second piston chamber, one end of the connecting box is fixedly connected to a discharge pipe, one end of the connecting box and located above the discharge pipe is fixedly connected to a suction pipe, one end of the suction pipe and the discharge pipe extend into the second piston chamber and are fixedly connected to a one-way valve, the other end of the suction pipe extends into the sealing sleeve, one end of the reciprocating threaded rod extends to the first sliding sleeve and is connected to a second transmission gear through a one-way bearing.

[0007] Optionally, the top of the sealing sleeve is fixedly connected to a fixed box, two first piston chambers are provided inside the fixed box, a movable groove is provided inside the fixed box and at one end of the first piston chamber, a reciprocating screw is rotatably connected inside the movable groove, a piston column is threadedly connected to the outer side of the reciprocating screw, one end of the piston column extends to the first piston chamber and cooperates with the first piston chamber, one side of the fixed box is fixedly connected to a first branch pipe, one side of the fixed box and one side of the first branch pipe is fixedly connected to a second branch pipe, both ends of the second branch pipe and the first branch pipe extend to the first piston chamber and are fixedly connected to a one-way valve, the other end of the second branch pipe extends to the inside of the sealing sleeve, one side of the sealing sleeve is fixedly connected to an air box, and one end of the other first branch pipe extends to the inside of the air box.

[0008] Optionally, a connecting groove is opened inside the fixed box and between the two movable grooves, a rotating rod is rotatably connected inside the connecting groove, a one-way bearing is provided on the outer side of the reciprocating screw rod, and a first pulley connected to the outer side of the one-way bearing and the rotating rod is provided with a belt drive, one end of the rotating rod extends to the inside of the first sliding sleeve and is fixedly provided with a first transmission gear, and the inner wall of the first sliding sleeve is fixedly connected to a first rack matching the first transmission gear and the second transmission gear.

[0009] Optionally, one side of the sealing sleeve is fixedly connected with a detection column, the bottom of the inner cavity of the detection column is fixedly connected with an airbag, the top of the airbag is fixedly connected with a finger block, the top of the finger block is fixedly connected with a limit spring, one side of the detection column is fixedly connected with a visual scale, one side of the detection column is fixedly connected with a connecting tube, one end of the connecting tube extends to the inside of the sealing sleeve, and the other end of the connecting tube extends to the inside of the airbag, and can pass through the finger block and the visual scale.

[0010] Optionally, a plurality of elastic sockets are fixedly connected to the surface of the iron core, a threaded block is fixedly connected to one side of the iron core, a connecting rod is placed on one side of the iron core and on the side of the elastic socket, the top of the connecting rod is fixedly connected to a limiting block, a screw is rotatably connected inside the limiting block, one end of the screw extends into the inside of the threaded block and is threadably connected to the inside of the threaded block, and a push roller is fixedly connected to one side of the connecting rod.

[0011] Optionally, the push roller, threaded block, screw rod, connecting rod, elastic clamping seat, limit block and screw rod are all made of insulating material.

[0012] The present invention provides a low-voltage current transformer for national grid metering, which has the following beneficial effects:

[0013] 1. The low-voltage current transformer for national grid metering is provided with a fixed sleeve, a sealing sleeve and a rotating sleeve, which can seal the connection between the terminal, the connecting ring and the connecting wire, and discharge the air inside the fixed sleeve, the rotating sleeve and the sealing sleeve and discharge it into the inert gas, so as to protect the connection between the terminal, the connecting ring and the connecting wire. At the same time, the extension angle of the connecting wire can be adjusted through the rotatable rotating sleeve to facilitate the use of the current transformer.

[0014] 2. The low-voltage current transformer for national grid metering is provided with an iron core, an elastic holder and a push roller. The outer side of the conductor to be detected is clamped into the elastic holder, and the other end of the conductor can be passed through the middle of the iron core. Then the connecting rod is placed on one side of the iron core, and then one end of the screw is screwed into the threaded block, so that the conductor part folded at one end of the iron core is pushed by the connecting rod to pass into the middle of the iron core and pass out from the other end of the iron core, which is convenient for winding the conductor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the internal structure of the present invention;

[0016] Figure 2 It is a schematic diagram of the internal structure of the fixed sleeve, the rotating sleeve and the sealing sleeve of the present invention;

[0017] Figure 3 This is a schematic diagram of the internal structure of the second sliding sleeve of the present invention;

[0018] Figure 4 This is a schematic diagram of the internal structure of the first sliding sleeve of the present invention;

[0019] Figure 5 It is a schematic diagram of the side view structure of the iron core of the present invention;

[0020] Figure 6 For the present invention Figure 1 A magnified image of point A;

[0021] Figure 7 For the present invention Figure 2 A magnified view of point B;

[0022] Figure 8 For the present invention Figure 2 Enlarged view of point C.

[0023] In the figure: 1, fixing member; 2, mounting seat; 3, terminal; 4, connecting ring; 5, screw; 6, connecting wire; 7, fixing sleeve; 8, sealing sleeve; 9, rotating sleeve; 10, air box; 11, first sliding sleeve; 12, fixing box; 13, first piston chamber; 14, moving groove; 15, reciprocating screw rod; 16, piston column; 17, connecting groove; 18, rotating rod; 19, first pulley; 20, first transmission gear; 21, first rack; 22, connecting box; 23, second piston chamber; 24, driving groove; 25, reciprocating threaded rod; 26, piston block; 27, straw; 28 , row pipe; 29, second transmission gear; 30, second sliding sleeve; 31, drive box; 32, threaded column; 34, slot; 35, plug block; 36, positioning block; 37, first branch pipe; 38, second branch pipe; 39, worm; 40, worm wheel; 41, gear ring; 42, third transmission gear; 43, detection column; 44, airbag; 45, limit spring; 46, finger block; 47, visual scale; 48, connecting pipe; 49, elastic holder; 50, sealing groove; 51, iron core; 52, push roller; 53, threaded block; 54, connecting rod; 55, limit block; 56, screw. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] Embodiment 1

[0026] See also Figures 1 to 8The present invention provides a technical solution: a low-voltage current transformer for national grid metering, comprising a fixing member 1, a mounting seat 2 is fixedly connected to the top of the fixing member 1, an iron core 51 is fixedly connected to the top of the mounting seat 2, two wiring terminals 3 are fixedly connected to one side of the mounting seat 2, a fixing sleeve 7 is fixedly connected to one side of the mounting seat 2 and located outside the wiring terminals 3, a rotating sleeve 9 is slidably connected to one side of the fixing sleeve 7, a sealing sleeve 8 is placed on one side of the rotating sleeve 9, a plurality of slots 34 are opened on one side of the sealing sleeve 8, and a plug block is fixedly connected to one side of the rotating sleeve 9. 35, one end of the plug block 35 extends to the inside of the slot 34, the surface of the sealing sleeve 8 and one end of the plug block 35 are fixedly connected to the drive box 31, the inside of the drive box 31 is rotatably connected with a threaded column 32, the outer side of the threaded column 32 is threadedly connected with a positioning block 36, one end of the positioning block 36 extends to the inside of the plug block 35, the outer side of the wiring terminal 3 is sleeved with a connecting ring 4, the inside of the wiring terminal 3 is threadedly connected with a screw 5, one end of the connecting ring 4 is fixedly connected with a connecting line 6, and a matching sealing groove 50 is opened on one side of the rotating sleeve 9 and the sealing sleeve 8.

[0027] Among them, the outer side of the threaded column 32 is fixedly sleeved with a worm wheel 40, the inside of the drive box 31 is rotatably connected with a worm 39, the worm 39 is transmission-connected to the worm wheel 40, the outer side of the sealing sleeve 8 is slidably connected with the first sliding sleeve 11, the outer side of the first sliding sleeve 11 is fixedly connected with the second sliding sleeve 30, the inner cavity of the second sliding sleeve 30 is fixedly connected with a gear ring 41, one end of the worm 39 extends to the inside of the second sliding sleeve 30 and is fixedly sleeved with a third transmission gear 42 that matches the gear ring 41. Through the rotation of the first sliding sleeve 11 and the second sliding sleeve 30, the threaded column 32 is driven to drive the positioning block 36 to move, fix the insertion block 35 and the slot 34, and fix the rotating sleeve 9 and the sealing sleeve 8.

[0028] Among them, the bottom of the sealing sleeve 8 is fixedly connected to a connection box 22, a second piston chamber 23 is opened inside the connection box 22, a driving groove 24 is opened inside the connection box 22 and at one end of the second piston chamber 23, a reciprocating threaded rod 25 is rotatably connected inside the driving groove 24, the outer side of the reciprocating threaded rod 25 is threadedly connected to a piston block 26, one end of the piston block 26 extends to the inside of the second piston chamber 23 and cooperates with the inside of the second piston chamber 23, one end of the connection box 22 is fixedly connected to a discharge pipe 28, and the connection box 22 is fixedly connected to the second piston chamber 23. One end of the connecting box 22 and above the discharge pipe 28 is fixedly connected with a suction pipe 27, one end of the suction pipe 27 and the discharge pipe 28 extend to the inside of the second piston chamber 23 and are fixedly connected with a one-way valve, the other end of the suction pipe 27 extends to the inside of the sealing sleeve 8, one end of the reciprocating threaded rod 25 extends to the inside of the first sliding sleeve 11 and is connected to the second transmission gear 29 through a one-way bearing, and the first sliding sleeve 11 rotates to drive the second piston chamber 23 to work, and the air inside the sealing sleeve 8 is extracted and discharged into the external environment.

[0029] Among them, the top of the sealing sleeve 8 is fixedly connected to a fixed box 12, and two first piston chambers 13 are provided inside the fixed box 12. A movable groove 14 is provided inside the fixed box 12 and at one end of the first piston chamber 13. A reciprocating screw rod 15 is rotatably connected inside the movable groove 14. The outer side of the reciprocating screw rod 15 is threadedly connected to a piston column 16. One end of the piston column 16 extends to the inside of the first piston chamber 13 and cooperates with the inside of the first piston chamber 13. A first branch pipe 37 is fixedly connected to one side of the fixed box 12, and a second branch pipe 38 is fixedly connected to one side of the fixed box 12 and located on one side of the first branch pipe 37. Both ends of the second branch pipe 38 and the first branch pipe 37 extend to the first piston chamber. 13 and are fixedly connected with a one-way valve, the other end of the second branch pipe 38 extends to the inside of the sealing sleeve 8, one side of the sealing sleeve 8 is fixedly connected to the gas box 10, and one end of the other first branch pipe 37 extends to the inside of the gas box 10. The inert gas in the gas box 10 can be discharged into the sealing sleeve 8 and the rotating sleeve 9 through the first branch pipe 37 and the second branch pipe 38 to protect the connection between the terminal 3, the connecting ring 4 and the connecting line 6. The inert gas in the sealing sleeve 8 and the rotating sleeve 9 can also be drawn into the gas box 10 through the first branch pipe 37 and the second branch pipe 38 for storage for subsequent use. The inert gas can be replenished into the gas box 10 through the replenishing valve installed on one side of the gas box 10.

[0030] Among them, connecting grooves 17 are opened inside the fixed box 12 and between the two movable grooves 14, and a rotating rod 18 is rotatably connected inside the connecting grooves 17. A one-way bearing is provided on the outside of the reciprocating screw rod 15, and a first pulley 19 connected by a belt drive is sleeved on the one-way bearing and the outside of the rotating rod 18. One end of the rotating rod 18 extends to the inside of the first sliding sleeve 11 and is fixedly sleeved with a first transmission gear 20. The inner wall of the first sliding sleeve 11 is fixedly connected to a first rack 21 that matches the first transmission gear 20 and the second transmission gear 29, which can drive the two first piston chambers 13 to work or not work as the first sliding sleeve 11 rotates forward or reverse.

[0031] Among them, one side of the sealing sleeve 8 is fixedly connected with a detection column 43, the bottom of the inner cavity of the detection column 43 is fixedly connected with an airbag 44, the top of the airbag 44 is fixedly connected with a finger block 46, the top of the finger block 46 is fixedly connected with a limit spring 45, one side of the detection column 43 is fixedly connected with a visual scale 47, one side of the detection column 43 is fixedly connected with a connecting pipe 48, one end of the connecting pipe 48 extends to the inside of the sealing sleeve 8, and the other end of the connecting pipe 48 extends to the inside of the airbag 44, and the finger block 46 and the visual scale 47 can be used to detect and display whether there are leakage points on the sealing sleeve 8 and the rotating sleeve 9.

[0032] Among them, a plurality of elastic sockets 49 are fixedly connected to the surface of the iron core 51, a threaded block 53 is fixedly connected to one side of the iron core 51, a connecting rod 54 is placed on one side of the iron core 51 and on the side of the elastic socket 49, the top of the connecting rod 54 is fixedly connected to a limiting block 55, the inside of the limiting block 55 is rotatably connected to a screw 56, one end of the screw 56 extends to the inside of the threaded block 53 and is threadedly connected to the inside of the threaded block 53, and one side of the connecting rod 54 is fixedly connected to a push roller 52, which can facilitate the winding of the conductor.

[0033] Embodiment 2

[0034] See also Figure 1 , Figure 5 and Figure 8 The present invention provides a technical solution: the push roller 52, the threaded block 53, the screw 56, the connecting rod 54, the elastic holder 49, the limit block 55 and the screw 56 are all made of insulating materials, which does not hinder the detection of the winding wire through the iron core 51.

[0035] In summary, when using the low-voltage current transformer for national grid metering, the outer side of the wire to be detected is clamped into the elastic clamping seat 49, and the other end of the wire can be passed through the middle of the iron core 51, and then the connecting rod 54 is placed on one side of the iron core 51, and then one end of the screw 56 is screwed into the threaded block 53, so that the wire part folded at one end of the iron core 51 is pushed through the connecting rod 54 to pass into the middle of the iron core 51 and pass out from the other end of the iron core 51, thereby completing the winding work, and then one end of the connecting wire 6 is wound into a connecting ring 4, and then the rotating sleeve 9 is rotated to rotate the sealing groove 50 to the required position, and the connecting ring 4 is sleeved on the outside of the terminal 3, and then one end of the screw 5 is screwed into the terminal 3 to connect the connecting wire 6. The positions of the connecting ring 4 and the connecting line 6 are limited, the outer side of the connecting line 6 is placed inside the sealing groove 50, and then the sealing sleeve 8 is placed on one side of the rotating sleeve 9, so that the plug block 35 is inserted into the slot 34, and then the operator rotates the first sliding sleeve 11, so that the first sliding sleeve 11 drives the first rack 21 to move circumferentially around the sealing sleeve 8, so that the first rack 21 drives the second transmission gear 29 to rotate, so that the second transmission gear 29 can drive the reciprocating threaded rod 25 through the one-way bearing, so that the reciprocating threaded rod 25 drives the piston block 26 to reciprocate, so that the air inside the sealing sleeve 8 is sucked into the second piston chamber 23 through the suction pipe 27, and then discharged to the external environment through the discharge pipe 28, and then the first rack 2 1 is out of contact with the second transmission gear 29, and then the first rack 21 drives the first transmission gear 20 to rotate, so that the first transmission gear 20 drives the rotating rod 18 to rotate, so that the rotating rod 18 can drive the first pulley 19 and a moving groove 14 to rotate through a one-way bearing, so that the moving groove 14 drives the piston rod 16 to reciprocate, so that the gas inside the air box 10 is sucked into the first piston chamber 13 through the first branch pipe 37, and then enters the sealing sleeve 8 through the second branch pipe 38. At this time, the rotating rod 18 cannot drive the first pulley 19 through another one-way bearing to rotate another reciprocating screw rod 15, and thus cannot drive another first piston chamber 13 to work, and the gas is in the sealing sleeve 8 and the rotating sleeve 9. After the internal filling, the gas will enter the airbag 44 from the connecting pipe 48, so that the airbag 44 expands, so that the airbag 44 pushes the finger block 46 and the limit spring 45 to move, until the limit spring 45 moves to the specified position, at this time, the first sliding sleeve 11 stops rotating, and when the first sliding sleeve 11 rotates, the second sliding sleeve 30 is driven to rotate, so that the second sliding sleeve 30 drives the ring gear 41 to rotate, and then the ring gear 41 drives the third transmission gear 42 to rotate, so that the third transmission gear 42 drives the worm 39 to rotate, so that the worm 39 drives the worm wheel 40 to rotate, so that the worm wheel 40 drives the threaded column 32 to rotate, so that the threaded column 32 drives one end of the positioning block 36 to be inserted into the inside of the insert block 35, and fixes the sealing sleeve 8 and the rotating sleeve 9;

[0036] If there is a seal failure problem on the rotating sleeve 9 and the sealing sleeve 8, the gas inside the rotating sleeve 9 and the sealing sleeve 8 will leak to the outside, and the gas inside the airbag 44 enters between the sealing sleeve 8 and the rotating sleeve 9 through the connecting pipe 48, and then leaks to the outside through the leakage points on the rotating sleeve 9 and the sealing sleeve 8, so that the limit spring 45 pushes the finger block 46 to squeeze the airbag 44. The staff can observe the scale on the visual scale 47 pointed by the finger block 46 to determine whether there is a seal failure problem on the rotating sleeve 9 and the sealing sleeve 8;

[0037] If it is necessary to separate the connecting line 6 from the terminal 3, the operator resets and rotates the first sliding sleeve 11. At this time, the first sliding sleeve 11 drives the first rack 21 to reset and move, so that the first rack 21 drives the rotating rod 18 to rotate through the first transmission gear 20. At this time, the rotating rod 18 cannot drive the first pulley 19 through the one-way bearing to drive a reciprocating screw 15 to rotate, so that a first piston chamber 13 cannot be used. At this time, the rotating rod 18 can drive the first pulley 19 through the one-way bearing to drive another reciprocating screw 15 to rotate, so that the reciprocating screw 15 drives another piston column 16 to reciprocate, so that the gas inside the sealing sleeve 8 is sucked into the first piston chamber 13 through the second branch pipe 38, and then the gas inside the first piston chamber 13 is input into the air box 10 through the first branch pipe 37 for storage, and then the first rack 21 is disengaged from the first transmission gear 20, and the first rack 21 continues to move. The first rack 21 drives the second transmission gear 29 to rotate, so that the second transmission gear 29 cannot drive the reciprocating threaded rod 25 to drive the piston block 26 to reciprocate through the one-way bearing, so that the second piston chamber 23 cannot work, and the first sliding sleeve 11 rotates to drive the second sliding sleeve 30 to rotate, and the second sliding sleeve 30 rotates to drive the third transmission gear 42 to move in a circle, so that the third transmission gear 42 drives the worm 39, the worm wheel 40 and the threaded column 32 to rotate through the gear ring 41, so that the threaded column 32 drives one end of the positioning block 36 to move out of the inside of the plug block 35, releases the limit between the plug block 35 and the slot 34, and releases the limit between the rotating sleeve 9 and the sealing sleeve 8, and then the sealing sleeve 8 can be removed from one side of the rotating sleeve 9, and then one end of the screw 5 is screwed out from the inside of the terminal 3, and then the connecting ring 4 can be removed from the outside of the terminal 3, and then the connecting wire 6 and the connecting ring 4 can be separated from the terminal 3.

[0038] 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 low-voltage current transformer for national grid metering, comprising a fixing member (1), characterized in that: The top of the fixing member (1) is fixedly connected to a mounting seat (2), the top of the mounting seat (2) is fixedly connected to an iron core (51), one side of the mounting seat (2) is fixedly connected to two wiring terminals (3), one side of the mounting seat (2) and located outside the wiring terminals (3) is fixedly connected to a fixing sleeve (7), one side of the fixing sleeve (7) is slidably connected to a rotating sleeve (9), one side of the rotating sleeve (9) is provided with a sealing sleeve (8), one side of the sealing sleeve (8) is provided with a plurality of slots (34), one side of the rotating sleeve (9) is fixedly connected to an insert block (35), one end of the insert block (35) extends to the slot (34). 4), the surface of the sealing sleeve (8) and one end of the plug block (35) are fixedly connected to the drive box (31), the inside of the drive box (31) is rotatably connected to a threaded column (32), the outer side of the threaded column (32) is threadedly connected to a positioning block (36), one end of the positioning block (36) extends to the inside of the plug block (35), the outer side of the wiring terminal (3) is sleeved with a connecting ring (4), the inside of the wiring terminal (3) is threadedly connected to a screw (5), one end of the connecting ring (4) is fixedly connected to a connecting wire (6), and one side of the rotating sleeve (9) and the sealing sleeve (8) are provided with a matching sealing groove (50).

2. A low-voltage current transformer for national grid measurement according to claim 1, characterized in that: The outer side of the threaded column (32) is fixedly sleeved with a worm wheel (40), the interior of the drive box (31) is rotatably connected with a worm (39), and the worm (39) is transmission-connected to the worm wheel (40). The outer side of the sealing sleeve (8) is slidably connected with a first sliding sleeve (11), the outer side of the first sliding sleeve (11) is fixedly connected with a second sliding sleeve (30), the inner cavity of the second sliding sleeve (30) is fixedly connected with a gear ring (41), and one end of the worm (39) extends into the interior of the second sliding sleeve (30) and is fixedly sleeved with a third transmission gear (42) that matches the gear ring (41).

3. A low voltage current transformer for national grid measurement according to claim 2, characterized in that: The bottom of the sealing sleeve (8) is fixedly connected to a connection box (22), a second piston chamber (23) is provided inside the connection box (22), a driving groove (24) is provided inside the connection box (22) and at one end of the second piston chamber (23), a reciprocating threaded rod (25) is rotatably connected inside the driving groove (24), the outer side of the reciprocating threaded rod (25) is threadedly connected to a piston block (26), one end of the piston block (26) extends into the second piston chamber (23) and is connected to the second piston chamber (23). In cooperation, one end of the connection box (22) is fixedly connected to a discharge pipe (28), one end of the connection box (22) and located above the discharge pipe (28) is fixedly connected to a suction pipe (27), one end of the suction pipe (27) and the discharge pipe (28) extend into the second piston chamber (23) and are fixedly connected to a one-way valve, the other end of the suction pipe (27) extends into the sealing sleeve (8), and one end of the reciprocating threaded rod (25) extends into the first sliding sleeve (11) and is connected to a second transmission gear (29) via a one-way bearing.

4. A low voltage current transformer for national grid measurement according to claim 3, characterized in that: The top of the sealing sleeve (8) is fixedly connected to a fixed box (12), and two first piston chambers (13) are provided inside the fixed box (12). A movable groove (14) is provided inside the fixed box (12) and at one end of the first piston chamber (13). A reciprocating screw rod (15) is rotatably connected inside the movable groove (14). The outer side of the reciprocating screw rod (15) is threadedly connected to a piston column (16). One end of the piston column (16) extends into the first piston chamber (13) and cooperates with the inside of the first piston chamber (13). One side of the box (12) is fixedly connected to a first branch pipe (37), one side of the fixed box (12) and located on one side of the first branch pipe (37) is fixedly connected to a second branch pipe (38), both ends of the second branch pipe (38) and the first branch pipe (37) extend into the first piston chamber (13) and are fixedly connected to a one-way valve, the other end of the second branch pipe (38) extends into the sealing sleeve (8), one side of the sealing sleeve (8) is fixedly connected to an air box (10), and one end of the other first branch pipe (37) extends into the air box (10).

5. A low voltage current transformer for national grid measurement according to claim 4, characterized in that: A connecting groove (17) is provided inside the fixed box (12) and between the two movable grooves (14); a rotating rod (18) is rotatably connected inside the connecting groove (17); a one-way bearing is provided on the outer side of the reciprocating screw rod (15); and a first pulley (19) connected by a belt drive is sleeved on the outer side of the one-way bearing and the rotating rod (18); one end of the rotating rod (18) extends into the interior of the first sliding sleeve (11) and is fixedly sleeved with a first transmission gear (20); and a first rack (21) matched with the first transmission gear (20) and the second transmission gear (29) is fixedly connected to the inner wall of the first sliding sleeve (11).

6. A low voltage current transformer for national grid metering according to claim 1, characterized in that: One side of the sealing sleeve (8) is fixedly connected to a detection column (43), the bottom of the inner cavity of the detection column (43) is fixedly connected to an airbag (44), the top of the airbag (44) is fixedly connected to a finger block (46), the top of the finger block (46) is fixedly connected to a limit spring (45), one side of the detection column (43) is fixedly connected to a visual scale (47), one side of the detection column (43) is fixedly connected to a connecting pipe (48), one end of the connecting pipe (48) extends to the inside of the sealing sleeve (8), and the other end of the connecting pipe (48) extends to the inside of the airbag (44), and can be connected to the visual scale (47) through the finger block (46).

7. A low voltage current transformer for national grid metering according to claim 1, characterized in that: A plurality of elastic holders (49) are fixedly connected to the surface of the iron core (51), a threaded block (53) is fixedly connected to one side of the iron core (51), a connecting rod (54) is placed on one side of the iron core (51) and on the side of the elastic holder (49), a limit block (55) is fixedly connected to the top of the connecting rod (54), a screw rod (56) is rotatably connected inside the limit block (55), one end of the screw rod (56) extends into the inside of the threaded block (53) and is threadedly connected to the inside of the threaded block (53), and a push roller (52) is fixedly connected to one side of the connecting rod (54).

8. A low voltage current transformer for national grid metering according to claim 7, characterized in that: The push roller (52), the threaded block (53), the screw rod (56), the connecting rod (54), the elastic clamping seat (49), the limit block (55) and the screw rod (56) are all made of insulating materials.

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