A high voltage current transformer with multi-level insulation structure

Abstract

The present invention discloses a high-voltage current transformer with a multi-level insulation structure, and relates to the technical field of high-voltage current transformers. It includes a shell for installing a current transformer component inside, a sleeve installed at the bottom of the shell and connected to the shell, and used to inject an insulating fluid and lead out the wires of the current transformer component, and a secondary terminal box installed on one side of the outer bottom end of the sleeve, and used to receive the wires from the current transformer component. The present invention can provide an operating driving force for the electric rotating ring table by obtaining the charge difference when the primary winding and the secondary winding are connected to the electrical equipment to be tested, so as to drive the adjusting part to rotate, thereby realizing dynamic adjustment of the magnitude of the insulating fluid in the sleeve, so that in actual use, the insulation performance can be automatically optimized according to the change of the charge difference, thereby ensuring the safety and stability of the high-voltage current transformer.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage current transformers, in particular to a high-voltage current transformer with a multi-level insulation structure. Background Art

[0002] A high-voltage current transformer is a device used to measure current in a high-voltage power system. By converting high current into lower current, the current measurement and protection equipment can operate within a safe range. The high-voltage current transformer with a multi-level insulation structure is mainly used to prevent the current transformer from breaking down or leaking in a high-voltage environment, thereby ensuring the stable operation of the equipment.

[0003] After searching, the Chinese invention patent with announcement number "CN 105938155A" discloses a "current transformer". The application integrates a box with a sensor and a transformer body. As a part of the current transformer, the sensor provides the hardware conditions for live testing of partial discharge, capacitance and dielectric loss of the transformer, thereby facilitating the detection of partial discharge, capacitance and dielectric loss during the live process, making the live testing of the transformer convenient, safe and accurate, without the need to disconnect the power supply and connect the external sensor instrument.

[0004] In addition, the Chinese utility model patent with announcement number "CN210401496U" discloses "a new type of electronic voltage transformer". The application states that the secondary voltage is proportional to the primary voltage. The secondary voltage can be designed between 0 and 5V as needed. It is easy to interface with secondary intelligent equipment to meet the needs of contemporary intelligent, digital secondary instruments and protection. Because it has no iron core, it fundamentally eliminates the risk of ferromagnetic resonance and the hidden dangers of faults in the operation of the power system, providing reliable guarantees for personnel and equipment.

[0005] In high-voltage power systems, the insulation performance of high-voltage current transformers will gradually degrade due to long-term operation and the influence of external environmental factors, especially under severe climatic conditions, such as lightning strikes, heavy rains, high temperatures, etc. These factors may damage the insulation structure of the high-voltage current transformer. However, in actual applications, the insulation design of the two existing disclosed patents and similar devices often lacks adjustability. Therefore, in actual applications, once the insulation performance of the high-voltage current transformer decreases, it may cause the current transformer to fail to operate normally and may even cause safety accidents. Summary of the invention

[0006] The object of the present invention is to provide a high voltage current transformer with a multi-level insulation structure to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solution: a high voltage current transformer adopting a multi-level insulation structure, comprising:

[0008] A housing for mounting a current transformer assembly therein;

[0009] A sleeve, installed at the bottom of the housing and connected to the housing, for injecting insulating fluid and leading out the wire of the current mutual inductance assembly;

[0010] A secondary terminal box is mounted on one side of the outer bottom end of the sleeve and is used to receive wires from the current transformer assembly;

[0011] The current mutual inductance component comprises:

[0012] A primary winding and two secondary windings, wherein the two secondary windings are respectively sleeved at two ends of the primary winding, and a transmission component for obtaining the current of the secondary winding and the primary winding is installed outside the secondary winding;

[0013] The transmission component rotates along with the charge difference between the primary winding and the secondary winding, and dynamically adjusts the level of the insulating fluid in the sleeve during the rotation. Different insulating fluid levels correspond to different insulation properties of the current transformer.

[0014] As a further preferred embodiment of the present technical solution, the transmission component includes:

[0015] A shielding ring, sleeved on the outer surface of the secondary winding, for reducing interference between the primary winding and the secondary winding;

[0016] A conductive limit seat is fixed to the side of the shielding ring away from the inner wall of the shell, and an electric rotating ring platform is installed on the surface of the conductive limit seat. Independent current connecting parts are respectively arranged inside and outside the electric rotating ring platform. The two current connecting parts are respectively used to collect the charge of the primary winding and the charge of the secondary winding, and drive the adjustment part installed on the top of the electric rotating ring platform to rotate based on the charge difference between the primary winding and the secondary winding.

[0017] As a further preferred embodiment of the present technical solution, the adjusting member includes:

[0018] A traction cylinder is arranged at the top of the conductive limit seat and is used for rotating during the operation of the conductive limit seat;

[0019] A wire harness groove is provided on the surface of the traction cylinder away from the conductive limit seat, and the wire harness groove is used for winding the traction harness;

[0020] An electronic injection valve tube is provided on one side of the external top end of the sleeve, and the electronic injection valve tube is used to inject insulating fluid. A grading partition is slidably connected inside the sleeve, and the grading partition is adapted to the sleeve. Binding fulcrums are respectively fixed at both ends of the top surface of the grading partition, and the binding fulcrums are used to connect and fix the traction harness.

[0021] As a further preferred embodiment of the present technical solution, the current connecting piece installed outside the secondary winding includes:

[0022] The secondary capacitor is fitted on the outer surface of the electric rotating ring platform. The terminals at both ends of the secondary capacitor are respectively fixed to and connected with the secondary winding and the electric rotating ring platform. The secondary capacitor receives the power transmitted from the secondary winding to the electric rotating ring platform.

[0023] As a further preferred embodiment of the present technical solution, the current connecting piece installed outside the primary winding includes:

[0024] An isolation resistor ring seat is sleeved on the outside of the primary winding, and the bottom surface of the isolation resistor ring seat is fixed to the conductive limit seat, a plurality of contact wires are embedded in the isolation resistor ring seat, one end of the contact wire is in contact with the outer surface of the primary winding, and the other end of the contact wire is fixed with a primary capacitor for providing current to the conductive limit seat;

[0025] The charge of the electrical equipment to be tested generated in the primary winding is transferred through the contact wire, reduced in voltage along the isolation resistor ring seat, and finally transmitted to the conductive limit seat along the primary capacitor.

[0026] As a further preferred embodiment of the present technical solution, the amount of charge stored in each of the primary capacitors is limited to a unique value, and only one amount of charge reduced from the isolation resistor ring seat can be transmitted along the primary capacitor to the conductive limit seat.

[0027] As a further preferred embodiment of the present technical solution, a receiving ring groove is fixed on the top of the isolation resistor ring seat, the receiving ring groove is sleeved outside the primary winding, the top of the receiving ring groove is rotatably connected to a connecting drum frame, and the frame body outside the connecting drum frame is fixed to the inner wall of the traction cylinder;

[0028] A shielding cylinder is fixed on the top of the connecting cylinder frame, and the shielding cylinder is used to reduce the interference between the primary winding and the secondary winding and to allow the transmission components located at both ends of the primary winding to be linked.

[0029] As a further preferred embodiment of the present technical solution, an explosion-proof cylinder is fixed on the top of the shell, which is connected to the shell and is used to release the pressure in the shell when the circuit between the primary winding and the secondary winding overheats, thereby protecting the current mutual inductance component from damage. A pressure relief window is provided at one end of the surface of the explosion-proof cylinder, and an explosion-proof plate is installed at the pressure relief window.

[0030] As a further preferred embodiment of the present technical solution, a base is installed at the bottom end of the outside of the sleeve, the base is used to support the sleeve, and is installed outside the electrical equipment to be used, the secondary terminal box is placed at one end of the outside of the base, and a drain valve pipe for discharging insulating fluid is fixed to the bottom of the sleeve.

[0031] As a further preferred embodiment of the technical solution, the inner wall of the shell is respectively embedded with an assembly seat at a position close to both ends of the primary winding, a guide block is fixed to one end of the assembly seat away from the inside of the shell, and the other end of the assembly seat is fixed to one end of the primary winding, and the guide block, the assembly seat and the primary winding are sequentially connected;

[0032] A conductive wire harness for current diversion is fixed to the bottom end of the secondary winding, a secondary outlet pipe is inserted and fixed inside the sleeve, the grading partition is sleeved outside the secondary outlet pipe and is slidably connected to the secondary outlet pipe, and the end of the conductive wire harness is connected to the secondary terminal box along the secondary outlet pipe.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The high-voltage current transformer with a multi-level insulation structure can provide a driving force for the electric rotating ring table by obtaining the charge difference when the primary winding and the secondary winding are connected to the electrical equipment to be tested, so as to drive the adjusting part to rotate, thereby realizing dynamic adjustment of the magnitude of the insulating fluid in the sleeve, so that in actual use, the insulation performance can be automatically optimized according to the change of the charge difference, thereby ensuring the safety and stability of the high-voltage current transformer;

[0035] In addition, through the coordinated operation of the primary capacitor, the secondary capacitor and the electric conversion station, a more accurate collection and conversion of the charge difference between the primary winding and the secondary winding is achieved, which guarantees the measurement accuracy of the current transformer and the response speed to the charge change to a certain extent;

[0036] Finally, the designed explosion-proof tube reduces the risk of safety accidents caused by circuit overheating, and enhances the safety performance of the equipment during use to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is an isometric view of the present invention;

[0038] Figure 2 It is an internal structure assembly diagram of the present invention;

[0039] Figure 3 It is a structural cross-sectional view of the device of the present invention along the AA direction;

[0040] Figure 4 It is a structural cross-sectional view of the invention device along the BB direction;

[0041] Figure 5 is an isometric diagram of a current mutual inductance assembly of the present invention;

[0042] Figure 6 It is an assembly diagram between the primary winding and the secondary winding of the present invention;

[0043] Figure 7 It is an exploded view of the transmission component of the present invention;

[0044] Figure 8 For the present invention Figure 7 Auxiliary illustration of .

[0045] In the figure: 1. explosion-proof cylinder; 2. explosion-proof plate; 3. current mutual inductance component; 301. guide block; 302. assembly seat; 303. traction harness; 304. graded partition; 305. traction cylinder; 306. secondary winding; 307. primary winding; 308. shielding cylinder; 309. shielding ring; 310. assembly groove; 311. conductive limit seat; 312. secondary capacitor; 313. primary capacitor; 314. connecting cylinder frame; 315. wire bundle groove; 316. electric rotating ring table; 317. magnetic power supply groove; 318. storage ring groove; 319. isolation resistor ring seat; 320. contact wire; 4. electron injection valve tube; 5. shell; 6. sleeve; 7. base; 8. discharge valve tube; 9. secondary terminal box; 10. secondary outlet pipe; 11. conduction harness. DETAILED DESCRIPTION

[0046] 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.

[0047] Before discussing in depth the technical solution of the multi-level insulation structure proposed in the present invention, it must be made clear that the traditional multi-level insulation structure usually refers to enhancing the insulation performance of the equipment by stacking insulating materials layer by layer. However, this traditional structure usually faces the problems of bulky volume, complex structure and limited insulation efficiency in practical applications. The multi-level insulation structure proposed in the present invention is achieved by adjusting the distribution level of the insulating material inside the equipment without changing the total amount of the insulating material.

[0048] In addition, it should be pointed out that, in the current technical field, the insulation design of the current transformer usually adopts a sleeve 6, and oil is filled inside the sleeve 6 as an insulating medium to achieve the insulation function. In actual use, due to its high dielectric strength and thermal conductivity, oil is often selected as the insulation and cooling medium of electrical equipment. It should be added that in the current transformer, the oil not only plays an insulating role, but also can absorb moisture and oxygen from the internal components, thereby playing a protective role. In addition, the proportion of oil will affect the insulation performance of the sleeve 6 to a certain extent. According to the existing document "Vacuum Oil Filling of Oil-Paper Capacitor Bushing" (Lu Yuncai, Tao Fengbo, etc.), it can be seen that an appropriate amount of oil filling can ensure the uniformity of the electric field distribution inside the bushing and provide a good insulation effect. At the same time, vacuum oil filling can also effectively remove air and moisture inside the bushing, further improving the insulation performance. Therefore, the technical solution proposed in the present invention is mainly intended to adjust the proportion of oil stored inside the sleeve 6, thereby affecting the insulation performance of the high-voltage current transformer.

[0049] Specifically, refer to Figure 1-Figure 8 It can be seen that the present invention proposes a high-voltage current transformer with a multi-level insulation structure, comprising:

[0050] The housing 5 is used to install the current mutual inductance component 3 inside.

[0051] It should be pointed out that in the structure of the present invention, an explosion-proof tube 1 is fixedly installed on the upper end portion of the shell 5. The explosion-proof tube 1 is interconnected with the shell 5. Its main function is to release the pressure accumulated inside the shell 5 in time when the circuit between the primary winding 307 and the secondary winding 306 is overheated. This design is to ensure the safety of the current transformer assembly 3 and prevent it from being damaged due to overheating or excessive pressure. In addition, a pressure relief window is provided at one end of the surface of the explosion-proof tube 1. The function of this pressure relief window is to provide an outlet when the pressure is released. At the corresponding position of the pressure relief window, a specially designed explosion-proof plate 2 is installed on the explosion-proof tube 1, wherein the explosion-proof plate 2 will automatically rupture when the pressure reaches a preset critical value, thereby allowing the internal high-pressure gas to be quickly discharged, effectively reducing the pressure in the shell 5. This design not only enhances the safety performance of the equipment, but also ensures the integrity of the current transformer assembly 3 under extreme conditions.

[0052] It should be added that, in the present invention, overheating of the circuit between the primary winding 307 and the secondary winding 306 generally refers to abnormal temperature rise caused by excessive current load, aging of the insulating material or external environmental factors. For example, during the operation of the high-voltage current transformer, if the current transmitted by the primary winding 307 exceeds the design range, or the insulating material gradually loses its effectiveness due to long-term operation, it may cause circuit overheating.

[0053] In addition, it should be noted that in the present invention, a base 7 is installed at the bottom end of the outside of the sleeve 6, the base 7 is used to support the sleeve 6, and is installed outside the electrical equipment to be used. The secondary terminal box 9 is placed at one end of the outside of the base 7, and a drain valve pipe 8 for discharging insulating fluid is fixed at the bottom of the sleeve 6.

[0054] It should also be noted that, in the present invention, the inner wall of the shell 5 is respectively embedded with an assembly seat 302 at the positions close to the two ends of the primary winding 307, and a guide block 301 is fixed to the end of the assembly seat 302 away from the inside of the shell 5, and the other end of the assembly seat 302 is fixed to one end of the primary winding 307, and the guide block 301, the assembly seat 302 and the primary winding 307 are connected in sequence. It should be added that, in the present invention, the guide block 301 is used to connect the user's detection harness and the electrical equipment to be used.

[0055] The sleeve 6 is installed at the bottom of the shell 5 and is connected to the shell 5. It is used to inject insulating fluid and lead out the wires (conduction harness 11) of the current mutual inductance component 3. In addition, a secondary terminal box 9 is installed on one side of the outer bottom end of the sleeve 6. The secondary terminal box 9 is used to receive the wires (conduction harness 11) from the current mutual inductance component 3.

[0056] It should be noted that in the present invention, a conductive wire harness 11 for current diversion is fixed to the bottom end of the outside of the secondary winding 306, a secondary outlet pipe 10 is inserted and fixed inside the sleeve 6, the grading partition 304 is sleeved outside the secondary outlet pipe 10 and is slidably connected to the secondary outlet pipe 10, and the end of the conductive wire harness 11 is connected to the secondary terminal box 9 along the secondary outlet pipe 10.

[0057] In addition, it should be added that an electronic injection valve tube 4 is provided on one side of the external top end of the sleeve 6, and the electronic injection valve tube 4 is used to inject the insulating fluid. A grading partition 304 is slidably connected inside the sleeve 6, and the grading partition 304 is adapted to the sleeve 6. Binding fulcrums are respectively fixed at both ends of the top surface of the grading partition 304, and the binding fulcrums are used to connect and fix the traction harness 303.

[0058] refer to Figure 5-Figure 8 It can be seen that the current mutual inductance component 3 includes: a primary winding 307 and two secondary windings 306. The two secondary windings 306 are respectively sleeved at two ends of the primary winding 307. The secondary winding 306 is installed with a transmission component for obtaining the current of the secondary winding 306 and the primary winding 307 respectively.

[0059] It should be noted that in the present invention, the primary winding 307 and the two secondary windings 306 are respectively used to obtain electrical signals under different current intensities. The primary winding 307 serves as a high-voltage side winding, which is directly connected to the current loop to be measured, withstands high voltage and converts current signals. The two secondary windings 306 are respectively located at both ends of the primary winding 307, and through the principle of electromagnetic induction, couple current signals from the primary winding 307 and convert these signals into secondary currents suitable for measurement or protection.

[0060] It should be added that in the present invention, the transmission component rotates along with the charge difference between the primary winding 307 and the secondary winding 306, and dynamically adjusts the insulating fluid level in the sleeve 6 during the rotation. Different insulating fluid levels correspond to different insulation properties of the current transformer.

[0061] As a preferred embodiment, in the present invention, the transmission component includes:

[0062] The shielding ring 309 is sleeved on the outer surface of the secondary winding 306 to reduce the interference between the primary winding 307 and the secondary winding 306, wherein a conductive limit seat 311 is fixed to the side of the shielding ring 309 away from the inner wall of the shell 5, and an electric rotating ring table 316 is installed on the surface of the conductive limit seat 311. Independent current connectors are respectively provided inside and outside the electric rotating ring table 316. The two current connectors are respectively used to collect the charge of the primary winding 307 and the charge of the secondary winding 306, and drive the adjustment part installed on the top of the electric rotating ring table 316 to rotate based on the charge difference between the primary winding 307 and the secondary winding 306.

[0063] It should be noted that in the present invention, the transmission component is used to dynamically adjust the level of the insulating fluid to achieve a multi-level insulation effect. When there is a charge difference between the primary winding 307 and the secondary winding 306, this difference will be sensed by the electric turntable 316. Based on the sensed charge difference, the electric turntable 316 will start and drive the adjustment part on its top to start rotating. This rotation action will further affect the distribution of the insulating fluid in the sleeve 6, thereby dynamically adjusting the level of the insulating fluid. The adjustment of the insulating fluid level can change the insulation performance of the current transformer, ensuring that it can maintain a good insulation effect under different current intensities, thereby improving the safety and stability of the equipment.

[0064] It should be noted that the electric turntable 316 proposed in the present invention senses the charge difference by regarding the electric turntable 316 as a complete circuit. In this complete circuit, when there is a charge difference between the primary winding 307 and the secondary winding 306, this charge difference will generate an electromotive force, which will drive the motor inside the electric turntable 316 to start rotating. It should be added that in the actual operation stage, the rotation speed and direction of the motor depend on the size and direction of the charge difference, thereby achieving accurate perception and response to the charge difference.

[0065] As a preferred embodiment, in the present invention, the adjusting member includes:

[0066] The traction cylinder 305 is arranged at the top end of the conductive limit seat 311 and is used for rotating during the operation of the conductive limit seat 311. It should be noted that a wire harness groove 315 is provided on the surface of the traction cylinder 305 away from the conductive limit seat 311, and the wire harness groove 315 is used for winding the traction harness 303.

[0067] As a preferred embodiment, in the present invention, the current connection member installed outside the secondary winding 306 includes:

[0068] The secondary capacitor 312 is mounted on the outer surface of the electric rotating ring platform 316 . The terminals at both ends of the secondary capacitor 312 are fixed and connected to the secondary winding 306 and the electric rotating ring platform 316 , respectively. The secondary capacitor 312 receives the power from the secondary winding 306 and transmits it to the electric rotating ring platform 316 .

[0069] It should be noted that the design of the secondary capacitor 312 in the present invention not only optimizes the current transmission path, but also enhances the electromagnetic compatibility of the entire system. Through the filtering effect of the secondary capacitor 312, the electromagnetic interference is effectively reduced, ensuring the stable operation of the current transformer in a complex electromagnetic environment. In addition, the close connection between the secondary capacitor 312 and the electric turntable 316 and the secondary winding 306 ensures the accurate perception and response of the charge difference, further ensuring the accuracy and reliability of the equipment.

[0070] As a preferred embodiment, in the present invention, the current connection piece installed outside the primary winding 307 includes:

[0071] The isolation resistor ring seat 319 is sleeved on the outside of the primary winding 307, and the bottom surface of the isolation resistor ring seat 319 is fixed to the conductive limit seat 311. A plurality of contact wires 320 are embedded in the isolation resistor ring seat 319. One end of the contact wire 320 is in contact with the outer surface of the primary winding 307, and the other end of the contact wire 320 is fixed with a primary capacitor 313 for providing current to the conductive limit seat 311.

[0072] It should be clear that the charge of the electrical device to be tested generated in the primary winding 307 is transmitted through the contact wire 320 , reduced in voltage along the isolation resistor ring seat 319 , and finally transmitted to the conductive limit seat 311 along the primary capacitor 313 .

[0073] It should be added that in the present invention, the design of the isolation resistor ring seat 319 not only plays the role of current transmission, but also realizes the effective voltage division of the current to be measured through its internal resistance structure, ensuring the safe operation of the current transformer at different voltage levels. In addition, the contact wire 320 is made of highly conductive material, which ensures the high efficiency and stability of charge transfer. The main capacitor 313 plays the role of smoothing current fluctuations and reducing electromagnetic interference, further improving the measurement accuracy and stability of the current transformer. It should be emphasized that this preferred implementation method optimizes the current transmission path through a reasonable current connector design, and improves the electromagnetic compatibility and operation reliability of the entire system.

[0074] It should also be supplemented to this embodiment that the amount of charge that is limited to be stored in each primary capacitor 313 is a unique value, and only one amount of charge that is stepped down from the isolation resistor ring seat 319 can be transmitted along the primary capacitor 313 to the conductive limit seat 311.

[0075] It should be further supplemented that in the present invention, an assembly groove 310 and a magnetic power supply groove 317 are respectively opened in the conductive limit seat 311, wherein the assembly groove 310 is adapted to the secondary capacitor 312, and the magnetic power supply groove 317 is adapted to the primary capacitor 313. Specifically, the primary capacitor 313 provides electric charge to the conductive limit seat 311 through the magnetic power supply groove 317.

[0076] It should be noted that the design that the charge amount stored by each primary capacitor 313 is limited to a unique value effectively avoids confusion and interference in the charge amount, ensuring the accuracy and reliability of the current transformer measurement results, wherein the precise charge limit of each primary capacitor 313 is achieved through sophisticated circuit design and component selection, which not only improves the performance of the current transformer, but also enhances its adaptability in complex electromagnetic environments. In addition, this design also helps to extend the service life of the current transformer and reduce equipment failures caused by abnormal charge amount.

[0077] As a preferred embodiment, in this embodiment, a receiving ring groove 318 is fixed on the top of the isolation resistor ring seat 319, and the receiving ring groove 318 is sleeved outside the primary winding 307. The top of the receiving ring groove 318 is rotatably connected to a connecting tube frame 314, and the external frame of the connecting tube frame 314 is fixed to the inner wall of the traction cylinder 305.

[0078] It should be noted that a shielding tube 308 is fixed to the top of the connecting tube frame 314 , and the shielding tube 308 is used to reduce the interference between the primary winding 307 and the secondary winding 306 and to allow the transmission components at both ends of the primary winding 307 to be linked.

[0079] Specifically, in this embodiment, the shielding tube 308 forms an effective electromagnetic shielding layer through the layout with the secondary winding 306. This electromagnetic shielding layer not only isolates the electromagnetic interference between the primary winding 307 and the secondary winding 306, but also optimizes the overall structure of the current transformer, making it more compact and efficient. It should be pointed out in particular that the cooperation between the storage ring groove 318 and the primary winding 307, as well as the connection between the connecting tube frame 314 and the traction cylinder 305, together constitute a mechanical structure. This mechanical structure not only improves the vibration resistance of the current transformer, but also enhances its stability in long-term operation. In addition, in practice, heat dissipation holes can be designed on the top of the shielding tube 308. These heat dissipation holes can effectively dissipate the heat generated by the current transformer during operation, further extending the service life of the equipment. In addition, in the present invention, one end of the shielding tube 308 is fixed to the connecting tube frame 314, and the other end is fixed to another shielding tube 308 outside the primary winding 307.

[0080] Finally, in practical applications of the device proposed by the present invention, when the current transmitted by the primary winding 307 fluctuates, the two secondary windings 306 will induce current signals accordingly. Subsequently, the electric turntable 316 in the transmission assembly will detect the charge difference between the primary winding 307 and the secondary winding 306. Based on the detected charge difference, the electric turntable 316 will be activated and cause the regulating element located on its top, namely the traction cylinder 305, to rotate. The rotation of the traction cylinder 305 will drive the grading partition 304 to slide in the sleeve 6 through the traction harness 303, thereby realizing dynamic adjustment of the magnitude of the insulating fluid. During the dynamic adjustment process, the proportion of the insulating fluid in the sleeve 6 changes, resulting in a corresponding change in the amount of charge obtained from the secondary winding 306. When the charge of the secondary winding 306 is equal to the charge of the primary winding 307, the electric turntable 316 will stop rotating. At this time, the distribution of the insulating fluid reaches an optimal state, and the insulation performance of the current transformer also tends to be stable.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A high voltage current transformer with a multi-level insulation structure, characterized in that: include: A housing (5) for mounting the current mutual inductance component (3) therein; A sleeve (6) is installed at the bottom of the housing (5) and is connected to the housing (5), and is used for injecting insulating fluid and leading out the wire of the current mutual inductance component (3); A secondary terminal box (9) is mounted on one side of the outer bottom end of the sleeve (6) and is used to receive a wire from the current transformer assembly (3); The current mutual inductance component (3) comprises: A primary winding (307) and two secondary windings (306), wherein the two secondary windings (306) are respectively sleeved on two ends of the outside of the primary winding (307), and a transmission component for respectively obtaining currents of the secondary winding (306) and the primary winding (307) is installed outside the secondary winding (306); The transmission component rotates along with the charge difference between the primary winding (307) and the secondary winding (306), and dynamically adjusts the level of the insulating fluid in the sleeve (6) during the rotation process, and the insulation performance of the current transformer corresponding to different insulating fluid levels is different; The transmission components include: A shielding ring (309) sleeved on the outer surface of the secondary winding (306) to reduce interference between the primary winding (307) and the secondary winding (306); A conductive limit seat (311) is fixed to a surface of the shielding ring (309) away from the inner wall of the housing (5); an electric rotating ring platform (316) is mounted on the surface of the conductive limit seat (311); independent current connectors are respectively arranged inside and outside the electric rotating ring platform (316); the two current connectors are respectively used to collect the charge of the primary winding (307) and the charge of the secondary winding (306), and based on the charge difference between the primary winding (307) and the secondary winding (306), the adjusting member mounted on the top of the electric rotating ring platform (316) is driven to rotate; The adjusting member comprises: A traction cylinder (305) is arranged at the top of the conductive limit seat (311) and is used for rotating during the operation of the conductive limit seat (311); A wire harness groove (315) is provided on the surface of the traction cylinder (305) on a side away from the conductive limit seat (311), and the wire harness groove (315) is used for winding the traction wire harness (303); An electron injection valve tube (4) is provided on one side of the external top end of the sleeve (6), and the electron injection valve tube (4) is used to inject an insulating fluid. A grading baffle (304) is slidably connected inside the sleeve (6), and the grading baffle (304) is adapted to the sleeve (6). Binding fulcrums are respectively fixed at both ends of the top surface of the grading baffle (304), and the binding fulcrums are used to connect and fix the traction harness (303).

2. A high voltage current transformer with a multi-level insulation structure according to claim 1, characterized in that: The current connection parts installed outside the secondary winding (306) include: The secondary capacitor (312) is mounted on the outer surface of the electric rotating ring platform (316), and the terminals at both ends of the secondary capacitor (312) are respectively fixed to and connected with the secondary winding (306) and the electric rotating ring platform (316). The secondary capacitor (312) receives the secondary winding (306) and transmits it to the electric rotating ring platform (316).

3. A high voltage current transformer with a multi-level insulation structure according to claim 1, characterized in that: The current connection parts installed outside the primary winding (307) include: An isolation resistor ring seat (319) is sleeved on the outside of the primary winding (307), and the bottom surface of the isolation resistor ring seat (319) is fixed to the conductive limit seat (311); a plurality of contact wires (320) are embedded in the isolation resistor ring seat (319); one end of the contact wire (320) is in contact with the outer surface of the primary winding (307); and the other end of the contact wire (320) is fixed with a primary capacitor (313) for providing current to the conductive limit seat (311); The electric charge of the electrical device to be tested generated in the primary winding (307) is transmitted through the contact wire (320), reduced in voltage along the isolation resistor ring seat (319), and finally transmitted to the conductive limit seat (311) along the primary capacitor (313).

4. A high voltage current transformer with a multi-level insulation structure according to claim 3, characterized in that: The amount of charge that is limited to be stored in each of the primary capacitors (313) is a unique value, and only one amount of charge that is reduced in voltage from the isolation resistor ring seat (319) can be transmitted along the primary capacitor (313) to the conductive limit seat (311).

5. The high voltage current transformer with a multi-level insulation structure according to claim 3, characterized in that: A receiving ring groove (318) is fixed on the top of the isolation resistor ring seat (319), the receiving ring groove (318) is sleeved outside the primary winding (307), the top of the receiving ring groove (318) is rotatably connected to a connecting cylinder frame (314), and the external frame body of the connecting cylinder frame (314) is fixed to the inner wall of the traction cylinder (305); A shielding cylinder (308) is fixed on the top of the connecting cylinder frame (314), and the shielding cylinder (308) is used to reduce interference between the primary winding (307) and the secondary winding (306) and to allow the transmission components at both ends of the primary winding (307) to be linked.

6. A high voltage current transformer with a multi-level insulation structure according to claim 1, characterized in that: An explosion-proof tube (1) is fixed on the top of the shell (5). The explosion-proof tube (1) is connected to the shell (5) and is used to release the pressure in the shell (5) when the circuit between the primary winding (307) and the secondary winding (306) is overheated, thereby protecting the current mutual inductance component (3) from damage. A pressure relief window is provided at one end of the surface of the explosion-proof tube (1), and an explosion-proof plate (2) is installed at the pressure relief window of the explosion-proof tube (1).

7. The high voltage current transformer with a multi-level insulation structure according to claim 1, characterized in that: A base (7) is installed at the bottom end of the outside of the sleeve (6), the base (7) is used to support the sleeve (6), and is installed outside the electrical equipment to be used, the secondary terminal box (9) is placed at one end of the outside of the base (7), and a discharge valve pipe (8) for discharging insulating fluid is fixed at the bottom of the sleeve (6).

8. The high voltage current transformer with a multi-level insulation structure according to claim 1, characterized in that: An assembly seat (302) is respectively embedded and fixed on the inner wall of the shell (5) at positions close to both ends of the primary winding (307); a guide block (301) is fixed to one end of the assembly seat (302) away from the inside of the shell (5); the other end of the assembly seat (302) is fixed to one end of the primary winding (307); the guide block (301), the assembly seat (302) and the primary winding (307) are sequentially connected; A conductive wire harness (11) for conducting current is fixed to the bottom end of the secondary winding (306), a secondary outlet pipe (10) is inserted and fixed inside the sleeve (6), the grading partition (304) is sleeved outside the secondary outlet pipe (10) and is slidably connected to the secondary outlet pipe (10), and the end of the conductive wire harness (11) is connected to the secondary terminal box (9) along the secondary outlet pipe (10).

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