A low temperature resistant high precision current transformer and use method thereof

Abstract

The present invention discloses a low-temperature resistant high-precision current transformer and a method of using the same, which relates to the technical field of transformers, including: a mounting base and a current transformer body, a connection protection device is installed on the mounting base, the current transformer body is connected to the mounting base through the connection protection device, a threading groove is provided at the center of the current transformer body, and several groups of pressure relief control components are installed around the current transformer body, each group of pressure relief control components is connected to a wire locking component through a rectangular connector, and several groups of wire locking components are arranged around the threading groove. The present invention ensures that the wire is firmly fixed in the threading groove through the wire locking component, resists external vibration, and ensures measurement accuracy. The pressure relief control component cuts off the circuit in time according to the shaking of the wire, improves the safety of the equipment, and the connection protection device fixes the base through a simple screw, and then inserts the current transformer body, simplifies installation and maintenance, and improves operating efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of mutual inductors, and in particular to a low-temperature resistant high-precision current mutual inductor and a use method thereof. Background Art

[0002] Current transformer is a commonly used measuring device in power systems, used to measure current and convert it into a standard electrical signal or voltage output. Especially in extreme environments, such as polar regions or high altitudes, the stability and accuracy of current transformers face challenges.

[0003] During the use of a traditional current transformer, a wire is passed through the through hole in the middle of the current transformer, and then the terminal of the wire is connected to the current transformer. However, since the wire passing through the through hole in the middle of the current transformer is not fixed, the terminal of the wire is prone to loosening and is inconvenient to disassemble. Therefore, we provide a low-temperature resistant high-precision current transformer and a method of use to solve one or more of the above problems. Summary of the invention

[0004] The object of the present invention is to provide a low temperature resistant high precision current transformer and a use method thereof, so as to solve one or more problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: including: a mounting base and a current transformer body, a connection protection device is installed on the mounting base, the current transformer body is connected to the mounting base through the connection protection device, a wire threading groove is provided in the center of the current transformer body, and several groups of pressure release control components are installed around the current transformer body, each group of pressure release control components is connected to a wire locking component through a rectangular connector, and several groups of wire locking components are arranged around the wire threading groove.

[0006] Preferably, a heat-conducting column is fixedly provided at the bottom of the outer wall of the current transformer body, and the heat-conducting column penetrates into the shell of the current transformer body, and a wire support frame is fixedly provided at one end of the rectangular connector away from the pressure release control assembly, and the wire locking assembly is arranged in the wire support frame.

[0007] Preferably, the wire locking assembly includes: an upper mounting shell and a lower mounting shell, the upper mounting shell is fixedly connected to the wire support frame, the upper mounting shell extends on one side close to the lower mounting shell to form an annular plug-in, several groups of positioning protrusions are arranged around the annular plug-in, and each group of positioning protrusions is provided with a threaded hole, an annular groove is provided on the lower mounting shell, and a gear ring is movably provided in the annular groove, and a center ring is arranged between the upper mounting shell and the lower mounting shell.

[0008] Preferably, a plurality of groups of identical semicircular grooves are provided around the lower mounting shell and the outer wall of the center ring, and the semicircular grooves close to each other can form a circular groove for accommodating the wire locking screw.

[0009] Preferably, a plurality of groups of positioning grooves are provided around the inner wall of the center ring, and each group of positioning grooves is provided corresponding to the positioning protrusions.

[0010] Preferably, a plurality of groups of mounting grooves are provided on one side of the lower mounting shell close to the upper mounting shell, and a driving gear is movably provided in each group of mounting grooves, and the driving gear is meshed with the gear ring.

[0011] Preferably, a group of wire locking screws are arranged in a one-to-one correspondence with each group of circular grooves. The wire locking screws move through the circular grooves, the driving gear and the threaded holes on the positioning protrusions in sequence. A guide groove is provided on the outer wall of the wire locking screw. A limit block is fixedly provided on the inner wall of the driving gear. The limit block is movably arranged in the guide groove. The wire locking screw is threadedly connected to the positioning protrusion on the annular plug-in.

[0012] Preferably, the pressure release control assembly includes: a control box, which is fixedly connected to the inner wall of the current transformer body shell, a rectangular connecting piece movably extends into the control box away from the side of the wire locking assembly, an electrode sheet is fixedly provided on the inner wall of the control box, one end of the L-shaped connecting rod is connected to the inner wall of the control box through a connecting spring 1, a first connecting rod is fixedly provided on the other end of the L-shaped connecting rod, and a trigger electrode is provided on the end of the first connecting rod close to the electrode sheet, the rotating shaft is rotatably connected to the inner wall of the control box, the circular piece and the second connecting rod are fixedly sleeved on the outer wall of the rotating shaft, the control rod is fixedly connected to one end of the rectangular connecting piece extending into the control box, and the control rod extends away from one end of the rectangular connecting piece to form a rectangular table, one end of the connecting spring 2 is fixedly connected to the rectangular table, one end of the connecting spring 2 is fixedly connected to the control box, and the second connecting rod abuts against the control rod on the side close to the control rod.

[0013] Preferably, the connecting protection device includes: a protection box body, the protection box body is fixedly connected to the mounting base, and the protection box body is provided with a plurality of groups of heat dissipation holes, the pressure plate is movably arranged on the right inner wall of the protection box body, the threaded rod movably extends into the protection box body and is fixedly connected to the pressure plate, a handle is provided at the other end of the threaded rod, the threaded rod and the protection box body are connected by threads, a plurality of groups of heat-conducting columns 2 are fixedly arranged on the side of the pressure plate away from the threaded rod, the corrugated plate is fixedly installed on the left inner wall of the protection box body, the front and rear inner walls of the protection box body are symmetrically fixedly provided with the same arc-shaped elastic part 1, airbag and arc-shaped elastic part 2, and the diameters of the airbag, arc-shaped elastic part 1 and arc-shaped elastic part 2 increase successively, and a plurality of groups of buffer springs are arranged between the arc-shaped elastic part 1 and the arc-shaped elastic part 2.

[0014] A method for using a low temperature resistant high precision current transformer is used to use a low temperature resistant high precision current transformer, and the method includes:

[0015] S1: Install the mounting base with the connection guard to the desired position by screws;

[0016] S2: Insert the current transformer body into the connection protection device and connect it to the mounting base;

[0017] S3: Pass the wire to be measured through the wire groove and fix it with the wire locking assembly.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. High-precision measurement: The setting of the pressure relief control component is connected to the wire locking component through a rectangular connector, so that the internal pressure of the current transformer body can be effectively controlled, the internal stability is maintained, and the accuracy and reliability of the measurement are ensured.

[0020] 2. Easy installation and disassembly: The connection protection device allows the current transformer body to be quickly installed and disassembled, which simplifies the operation process and reduces the difficulty of maintenance and replacement.

[0021] 3. Wire fixation and stability: The wire locking assembly is reasonably designed to ensure the stability of the wire during the measurement process and avoid measurement errors caused by loose wires.

[0022] 4. Enhanced protection performance: The protection box and the setting of multiple sets of arc-shaped elastic parts and buffer springs enable the equipment to maintain good protection performance under the influence of the external environment, effectively preventing damage to the equipment by external vibration and impact.

[0023] 5. Good heat dissipation effect: Several groups of heat dissipation holes set on the protective box body help to dissipate internal heat in time, preventing the equipment from overheating and affecting its performance and service life.

[0024] 6.Compact overall structure: Through reasonable component design and layout, the entire current transformer has a compact structure, which not only improves the reliability of the equipment, but also reduces the occupied space, making it easier to install and use in various complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the wire threading groove in the present invention;

[0027] Figure 3 It is a schematic diagram of the cross-sectional structure of the wire locking assembly in the present invention;

[0028] Figure 4 This is a schematic diagram of the explosion structure of the wire locking assembly in the present invention;

[0029] Figure 5 It is a partial structural schematic diagram of the wire locking assembly in the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the pressure release control component in the present invention;

[0031] Figure 7 It is a bottom structural schematic diagram of the connection protection device in the present invention.

[0032] In the figure: 1. Mounting base; 2. Connecting protection device; 3. Current transformer body; 301. Threading groove; 302. Heat-conducting column 1; 4. Pressure relief control assembly; 5. Rectangular connector; 6. Wire support frame; 7. Wire locking assembly; 8. Upper mounting shell; 801. Ring plug-in; 9. Lower mounting shell; 901. Ring groove; 10. Driving gear; 11. Semicircular groove; 12. Mounting groove; 13. Positioning protrusion; 14. Center ring; 15. Positioning groove; 16. Guide groove; 17. Connecting groove; 18. Wire locking screw; 19. Gear Ring; 20, limit block; 21, control box; 22, electrode sheet; 23, connecting spring 1; 24, L-shaped connecting rod; 25, first connecting rod; 26, trigger electrode; 27, rotating shaft; 28, circular part; 29, second connecting rod; 30, control rod; 31, rectangular table; 32, connecting spring 2; 33, protective box; 34, heat dissipation hole; 35, threaded rod; 36, handle; 37, heat-conducting column 2; 38, arc elastic part 1; 39, airbag; 40, buffer spring; 41, arc elastic part 2; 42, corrugated plate; 43, pressure plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] Example 1

[0037] See also Figure 1-2 The present invention provides a technical solution, including: a mounting base 1 and a current transformer body 3, a connection protection device 2 is installed on the mounting base 1, the current transformer body 3 is connected to the mounting base 1 through the connection protection device 2, a wire threading groove 301 is provided in the center of the current transformer body 3, and a plurality of groups of pressure release control components 4 are installed around the current transformer body 3, each group of pressure release control components 4 is connected to a wire locking component 7 through a rectangular connector 5, and a plurality of groups of wire locking components 7 are arranged around the wire threading groove 301.

[0038] Preferably, a heat-conducting column 302 is fixedly provided at the bottom of the outer wall of the current transformer body 3, and the heat-conducting column 302 penetrates into the shell of the current transformer body 3, and a wire support frame 6 is fixedly provided at one end of the rectangular connecting piece 5 away from the pressure release control component 4, and the wire locking component 7 is arranged in the wire support frame 6.

[0039] The present invention also provides a method for using a low temperature resistant high precision current transformer, which is used to use a low temperature resistant high precision current transformer, and the method comprises:

[0040] S1: Install the mounting base 1 with the connecting guard 2 to the desired position by screws;

[0041] S2: Insert the current transformer body 3 into the connection protection device 2 and connect it to the mounting base 1;

[0042] S3: Pass the wire to be measured through the wire threading groove 301 and fix it through the wire locking assembly 7.

[0043] The working principle and beneficial effects of the above technical solution are as follows: by arranging a heat-conducting column 302 at the bottom of the outer wall of the current transformer body 3, the heat-conducting column 302 penetrates into the interior of the shell, thereby effectively improving the heat dissipation performance. This design ensures that the equipment can maintain a stable operating temperature under any conditions, thereby improving the measurement accuracy and reliability. The design of the wire locking assembly 7 allows the wire to be firmly fixed in the wire threading groove 301, which ensures that the current transformer will not loosen even in the face of vibration or shaking in the external environment during operation, thereby ensuring the accuracy and stability of the measurement data. The installation and setting of the pressure relief control assembly 4 can timely cut off the circuit according to the shaking of the wire when encountering vibration or shaking in the external environment to improve its safety. The design of the connecting protection device 2 simplifies the installation and maintenance process of the equipment. The mounting base 1 is fixed to the desired position by screws, and the current transformer body 3 is inserted into the connecting protection device 2 to complete the installation of the equipment. This simple operation helps to reduce installation time and improve operating efficiency.

[0044] Example 2

[0045] Based on Example 1, please refer to Figure 1 and Figure 2-6 The wire locking assembly 7 includes: an upper mounting shell 8 and a lower mounting shell 9. The upper mounting shell 8 is fixedly connected to the wire support frame 6. The upper mounting shell 8 extends on one side close to the lower mounting shell 9 to form an annular plug-in 801. A plurality of groups of positioning protrusions 13 are arranged around the annular plug-in 801, and each group of positioning protrusions 13 is provided with a threaded hole. The lower mounting shell 9 is provided with an annular groove 901, and a gear ring 19 is movably provided in the annular groove 901. The center ring 14 is arranged between the upper mounting shell 8 and the lower mounting shell 9.

[0046] Preferably, a plurality of groups of identical semicircular grooves 11 are provided around the outer wall of the lower mounting shell 9 and the center ring 14 , and the semicircular grooves 11 close to each other can form a circular groove for accommodating the wire locking screw 18 .

[0047] Preferably, a plurality of groups of positioning grooves 15 are provided around the inner wall of the center ring 14 , and each group of positioning grooves 15 is provided corresponding to the positioning protrusions 13 .

[0048] Preferably, a plurality of groups of mounting grooves 12 are provided on one side of the lower mounting shell 9 close to the upper mounting shell 8 , and a driving gear 10 is movably provided in each group of mounting grooves 12 , and the driving gear 10 is meshed with the gear ring 19 .

[0049] Preferably, a group of wire locking screws 18 are arranged in a one-to-one correspondence with each group of circular grooves. The wire locking screws 18 are movable through the circular grooves, the driving gear 10 and the threaded holes on the positioning protrusions 13 in sequence. A guide groove 16 is opened on the outer wall of the wire locking screw 18. A limit block 20 is fixedly provided on the inner wall of the driving gear 10. The limit block 20 is movably arranged in the guide groove 16. The wire locking screw 18 is threadedly connected to the positioning protrusion 13 on the annular plug-in 801.

[0050] Preferably, the pressure release control assembly 4 includes: a control box 21, the control box 21 is fixedly connected to the inner wall of the shell of the current transformer body 3, the rectangular connector 5 is movably extended to the control box 21 away from the side of the wire locking assembly 7, the inner wall of the control box 21 is fixedly provided with an electrode sheet 22, one end of the L-shaped connecting rod 24 is connected to the inner wall of the control box 21 through a connecting spring 23, the other end of the L-shaped connecting rod 24 is fixedly provided with a first connecting rod 25, and the end of the first connecting rod 25 close to the electrode sheet 22 is provided with a trigger electrode 26, the rotating shaft 27 is rotatably connected to the inner wall of the control box body 21, the circular member 28 and the second connecting rod 29 are fixedly sleeved on the outer wall of the rotating shaft 27, the control rod 30 is fixedly connected to one end of the rectangular connecting member 5 extending into the control box body 21, and the control rod 30 extends away from one end of the rectangular connecting member 5 to form a rectangular platform 31, one end of the connecting spring 32 is fixedly connected to the rectangular platform 31, one end of the connecting spring 32 is fixedly connected to the control box body 21, and the second connecting rod 29 is close to the control rod 30 and abuts against the control rod 30.

[0051] The working principle and beneficial effects of the above technical solution are as follows:

[0052] When in use, after passing the wire through the center of the wire locking assembly 7, several groups of wire locking screws 18 are respectively inserted into the circular grooves formed by the semicircular grooves 11 close to each other on the lower mounting shell 9 and the center ring 14, and the limit blocks 20 on the inner wall of the driving gear 10 are located in the guide grooves 16 of the locking screws 18. At this time, only one group of locking screws 18 needs to be rotated. The locking screws 18 can drive the driving gear 10 to rotate through the cooperation of the guide grooves 16 and the limit blocks 20, and can move along the threaded holes set on the positioning protrusions 13 toward the center of the upper mounting shell 8 and the lower mounting shell 9. Move, at this time, this set of driving gears 10 drives the gear ring 19 to rotate, and the gear ring 19 will synchronously drive the remaining driving gears 10 to rotate, so that the remaining locking screws 18 move toward the direction close to the center of the upper mounting shell 8 and the lower mounting shell 9. There is no need for the installer to adjust the locking screws 18 one by one, thereby reducing the labor intensity of the staff, and allowing the wires to be firmly fixed in the wire threading groove 301, ensuring that the wires will not loosen during the operation of the current transformer even in the face of vibration or shaking in the external environment, thereby ensuring the accuracy and stability of the measurement data.

[0053] When encountering vibration or shaking of the external environment, the wire locking assembly 7 drives the rectangular connecting piece 5 to move into the control box 21 through the rectangular connecting piece 5, so that the control rod 30 moves back and forth. At this time, the connecting spring 2 32 can play an auxiliary buffering role. When encountering large vibration or shaking of the external environment, the rectangular platform 31 of the control rod 30 moves at a right angle to abut against the second connecting rod 29, and then pulls the second connecting rod 29 to swing around the rotating shaft 27, thereby driving the circular piece 28 to move in the direction away from the L-shaped connecting rod 24. At this time, the L-shaped connecting rod 24 is no longer blocked by the circular piece 28, and the connecting spring 1 23 pushes the L-shaped connecting rod 24 to move in the direction close to the electrode sheet 22. When the electrode sheet 22 contacts the trigger electrode 26, it means that the external environment is relatively harsh. At this time, the circuit connected to the wire is disconnected, thereby greatly improving safety.

[0054] Example 3

[0055] Based on any one of Examples 1-2, please refer to Figure 1 and Figure 7 The connecting protection device 2 includes: a protection box body 33, the protection box body 33 is fixedly connected to the mounting base 1, and a plurality of heat dissipation holes 34 are opened on the protection box body 33, a pressure plate 43 is movably arranged on the right inner wall of the protection box body 33, a threaded rod 35 is movably extended into the protection box body 33 and is fixedly connected to the pressure plate 43, a handle 36 is provided at the other end of the threaded rod 35, the threaded rod 35 is connected to the protection box body 33 by threads, a plurality of groups of heat-conducting columns 37 are fixedly arranged on the side of the pressure plate 43 away from the threaded rod 35, a corrugated plate 42 is fixedly installed on the left inner wall of the protection box body 33, and the front and rear inner walls of the protection box body 33 are symmetrically fixedly provided with the same arc-shaped elastic member 1 38, an airbag 39 and an arc-shaped elastic member 2 41, and the diameters of the airbag 39, the arc-shaped elastic member 1 38 and the arc-shaped elastic member 2 41 increase successively, and a plurality of groups of buffer springs 40 are arranged between the arc-shaped elastic member 1 38 and the arc-shaped elastic member 2 41.

[0056] The working principle and beneficial effects of the above technical solution are as follows: when in use, the distance between the heat-conducting column 2 37 and the corrugated plate 42 is changed by twisting the threaded rod 35, so that the current transformer body 3 with the heat-conducting column 1 302 is conveniently inserted into the protective box 33, and after insertion, the threaded rod 35 is twisted so that the heat-conducting column 2 37 presses the heat-conducting column 1 302 tightly. When encountering vibration or shaking in the external environment, the arc-shaped elastic member 2 41 can withstand the impact force of the first wave and after it reaches the buffering limit, it plays a secondary energy absorption role through a plurality of groups of buffer springs 40, and then the remaining impact force is generated to the arc-shaped elastic member 1 38. When the arc-shaped elastic member 1 38 reaches the buffering limit, the airbag 39 prevents the arc elastic member 1 38 and the arc elastic member 2 41 from undergoing extreme deformation, thereby protecting the current transformer body 3, and the heat conductive column 1 302 can guide the heat generated by the current transformer body 3 during use to the heat conductive column 2 37 and discharge it through the heat dissipation hole 34, which greatly improves the practicality. Through the setting of the protective box 33 and multiple groups of arc elastic members and buffer springs 40, the equipment can still maintain good protection performance under the influence of the external environment, and effectively prevent damage to the equipment by external vibration and impact. The several groups of heat dissipation holes 34 set on the protective box 33 help to dissipate the internal heat in time, preventing the performance and service life of the equipment from being affected by overheating.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A low temperature resistant high precision current transformer, characterized in that: include: A mounting base (1) and a current transformer body (3), wherein a connection protection device (2) is mounted on the mounting base (1), and the current transformer body (3) is connected to the mounting base (1) via the connection protection device (2); a wire threading groove (301) is provided at the center of the current transformer body (3), and a plurality of groups of pressure relief control components (4) are mounted around the current transformer body (3); each group of pressure relief control components (4) is connected to a wire locking component (7) via a rectangular connector (5), and a plurality of groups of wire locking components (7) are arranged around the wire threading groove (301); The connection protection device (2) comprises: a protection box (33), the protection box (33) is fixedly connected to the mounting base (1), and a plurality of groups of heat dissipation holes (34) are opened on the protection box (33), a pressure plate (43) is movably arranged on the right inner wall of the protection box (33), a threaded rod (35) movably extends into the protection box (33) and is fixedly connected to the pressure plate (43), a handle (36) is arranged at the other end of the threaded rod (35), the threaded rod (35) and the protection box (33) are connected by threads, and a plurality of groups of heat conducting columns (34) are arranged on the protection box (33). 37) are fixedly arranged on the side of the pressure plate (43) away from the threaded rod (35), the corrugated plate (42) is fixedly installed on the left inner wall of the protective box body (33), and the front and rear inner walls of the protective box body (33) are symmetrically fixedly provided with the same arc-shaped elastic member 1 (38), airbag (39) and arc-shaped elastic member 2 (41), and the diameters of the airbag (39), arc-shaped elastic member 1 (38) and arc-shaped elastic member 2 (41) are increased in sequence, and a plurality of groups of buffer springs (40) are arranged between the arc-shaped elastic member 1 (38) and the arc-shaped elastic member 2 (41).

2. A low temperature resistant high precision current transformer according to claim 1, characterized in that: A heat-conducting column (302) is fixedly provided at the bottom of the outer wall of the current transformer body (3), and the heat-conducting column (302) penetrates into the shell of the current transformer body (3); a wire support frame (6) is fixedly provided at one end of the rectangular connecting piece (5) away from the pressure relief control component (4), and a wire locking component (7) is arranged in the wire support frame (6).

3. A low temperature resistant high precision current transformer according to claim 2, characterized in that: The wire locking assembly (7) comprises: an upper mounting shell (8) and a lower mounting shell (9), wherein the upper mounting shell (8) is fixedly connected to the wire support frame (6), a side of the upper mounting shell (8) close to the lower mounting shell (9) extends to form an annular plug-in (801), a plurality of groups of positioning protrusions (13) are arranged around the annular plug-in (801), and each group of positioning protrusions (13) is provided with a threaded hole, an annular groove (901) is arranged on the lower mounting shell (9), and a gear ring (19) is movably arranged in the annular groove (901), and a center ring (14) is arranged between the upper mounting shell (8) and the lower mounting shell (9).

4. A low temperature resistant high precision current transformer according to claim 3, characterized in that: A plurality of groups of identical semicircular grooves (11) are provided around the outer wall of the lower mounting shell (9) and the center ring (14), and the semicircular grooves (11) close to each other can form a circular groove for accommodating the wire locking screw (18).

5. The low temperature resistant high precision current transformer according to claim 3, characterized in that: A plurality of groups of positioning grooves (15) are provided around the inner wall of the center ring (14), and each group of positioning grooves (15) is arranged corresponding to the positioning protrusion (13).

6. A low temperature resistant high precision current transformer according to claim 4, characterized in that: A plurality of groups of mounting grooves (12) are provided on one side of the lower mounting shell (9) close to the upper mounting shell (8), and a driving gear (10) is movably provided in each group of mounting grooves (12), and the driving gear (10) is meshed with a gear ring (19).

7. A low temperature resistant high precision current transformer according to claim 6, characterized in that: A group of wire locking screws (18) is arranged corresponding to each group of circular grooves. The wire locking screws (18) are movable through the circular grooves, the driving gear (10) and the threaded holes on the positioning protrusion (13) in sequence. A guide groove (16) is opened on the outer wall of the wire locking screw (18). A limit block (20) is fixedly arranged on the inner wall of the driving gear (10). The limit block (20) is movably arranged in the guide groove (16). The wire locking screw (18) is threadedly connected with the positioning protrusion (13) on the annular plug-in (801).

8. The low temperature resistant high precision current transformer according to claim 2, characterized in that: The pressure release control assembly (4) comprises: a control box (21), the control box (21) being fixedly connected to the inner wall of the shell of the current transformer body (3), a rectangular connecting piece (5) being movably extended into the control box (21) at a side away from the wire locking assembly (7), an electrode sheet (22) being fixedly provided on the inner wall of the control box (21), one end of an L-shaped connecting rod (24) being connected to the inner wall of the control box (21) via a connecting spring (23), a first connecting rod (25) being fixedly provided at the other end of the L-shaped connecting rod (24), and a trigger electrode (26) being provided at one end of the first connecting rod (25) close to the electrode sheet (22). The rotating shaft (27) is rotatably connected to the inner wall of the control box (21); the circular member (28) and the second connecting rod (29) are fixedly sleeved on the outer wall of the rotating shaft (27); the control rod (30) is fixedly connected to one end of the rectangular connecting member (5) extending into the control box (21); and the control rod (30) extends away from one end of the rectangular connecting member (5) to form a rectangular platform (31); one end of the second connecting spring (32) is fixedly connected to the rectangular platform (31); one end of the second connecting spring (32) is fixedly connected to the control box (21); and the side of the second connecting rod (29) close to the control rod (30) abuts against the control rod (30).

9. A method for using a low temperature resistant high precision current transformer, used for using a low temperature resistant high precision current transformer as claimed in any one of claims 1 to 8, characterized in that: Usage methods include: S1: Install the mounting base (1) with the connection guard (2) to the desired position by screwing; S2: inserting the current transformer body (3) into the connection protection device (2) and connecting it to the mounting base (1); S3: Pass the wire to be measured through the wire threading groove (301) and fix it by the wire locking assembly (7).

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