Current-voltage transformer with anti-electromagnetic interference function

Abstract

This application relates to a current and voltage transformer with electromagnetic interference suppression function, belonging to the technical field of power detection devices. It includes an insulating cast body, a second shielding shell, two first shielding shells, and a grounding busbar enclosed within the insulating cast body. Two voltage transformers are housed within the second shielding shell, and a current transformer is housed within each of the first shielding shells. The two first shielding shells are respectively located on opposite sides of the second shielding shell. The first and second shielding shells are made of conductive material. The grounding busbar connects to both the second shielding shell and the two first shielding shells, and a grounding terminal is provided on the grounding busbar, extending out of the insulating cast body. This application achieves physical isolation and independent electromagnetic shielding between the current transformer and the voltage transformer, effectively suppressing electromagnetic interference between internal components of the combined transformer and improving measurement accuracy.

Description

Technical Field

[0001] This application relates to the field of power detection devices, and in particular to a current and voltage transformer with electromagnetic interference suppression function. Background Technology

[0002] A combined current and voltage transformer is a device used in power systems to measure current, voltage, or electrical energy. It is essentially a combination of a voltage transformer and a current transformer. A combined transformer can be a combination of one voltage transformer and one current transformer for measuring single-phase power, or a combination of two voltage transformers and two current transformers for measuring three-phase power in a three-phase three-wire system using the two-watt method.

[0003] Chinese patent CN222775112U discloses an outdoor combined current and voltage transformer, which arranges a first current transformer, a first voltage transformer, a second voltage transformer, and a second current transformer in sequence and encapsulates them as a whole in a common epoxy resin insulating casting body, forming an integrated structure of current transformer and voltage transformer.

[0004] Regarding the aforementioned technical solution, the inventors believe that while the integrated structure simplifies the overall installation to some extent, tightly placing different functional transformer units within the same insulating cavity also introduces significant technical drawbacks: due to the differences in operating principles between current transformers and voltage transformers, the electromagnetic fields they generate during operation can affect each other. In particular, the strong magnetic field generated by the current transformer when a large current flows through its primary side can easily interfere with the measurement accuracy of adjacent voltage transformers. Conversely, the electric field of the voltage transformer can also interfere with the weak signal acquisition of the current transformer. This internal electromagnetic interference reduces the measurement accuracy of the combined current and voltage transformers. Summary of the Invention

[0005] In order to effectively suppress electromagnetic interference between internal components of a combined current transformer and improve measurement accuracy, this application provides a current and voltage transformer with electromagnetic interference suppression function.

[0006] This application provides a current and voltage transformer with electromagnetic interference suppression function, which adopts the following technical solution:

[0007] An electromagnetic interference resistant current and voltage transformer includes an insulating cast body, a second shielding shell, two first shielding shells, and a grounding busbar encapsulated within the insulating cast body. The second shielding shell contains two voltage transformers, and each of the first shielding shells contains a current transformer. The two first shielding shells are respectively located on opposite sides of the second shielding shell. The first and second shielding shells are made of conductive material. The grounding busbar is connected to both the second shielding shell and the two first shielding shells, and a grounding terminal is provided on the grounding busbar, extending out of the insulating cast body.

[0008] Optionally, the first shielding shell is cylindrical, and a spiral coil is coiled and fixed on the outer side of the first shielding shell. The spiral coil is made of metal and is sealed in the insulating casting body, with both ends of the spiral coil protruding from the insulating casting body.

[0009] Optionally, water or an electromagnetically conductive fluid flows through the spiral coil, with the upper end of the spiral coil being the inlet and the lower end being the outlet.

[0010] Optionally, the spiral coil is provided with a toggle mechanism that can move along its own winding direction.

[0011] Optionally, the actuating mechanism includes a flexible rope and multiple levers. Each lever is fixed to one side of the flexible rope via a connector. The outer side of the inner wall of the spiral coil is provided with a spiral guide tube. The inner side of the spiral guide tube is provided with a spiral groove. The spiral helix angle of the spiral guide tube and the spiral groove is the same as that of the spiral coil. The flexible rope passes through the spiral guide tube. The connector is accommodated in the spiral groove and can slide along the spiral groove. One end of the flexible rope is connected to a traction component.

[0012] Optionally, the connector is a connecting rod.

[0013] Optionally, a tension spring is provided at the end of the flexible rope away from the traction component. The outer diameter of the tension spring is larger than the inner diameter of the spiral guide tube. The end of the tension spring away from the flexible rope is fixed to the inner wall of the spiral coil. The tension spring is located near the inlet end of the spiral coil.

[0014] Optionally, the spiral coil has a vertically upward-leading outlet pipe on its outer side at the outlet end. The lower end of the outlet pipe is connected to the cavity of the spiral coil. The end of the flexible rope away from the tension spring passes through the spiral coil and the outlet pipe in sequence and is connected to the traction assembly. The traction assembly is located on the outer side of the insulating casting body.

[0015] Optionally, the traction assembly includes a reel, a shaft, and a traction gear. The reel and the traction gear are coaxially fixed with the shaft. The shaft is rotatably disposed on the outside of the insulating casting. The end of the flexible rope away from the tension spring is connected to the wheel surface of the reel. A drive motor is also provided on the outside of the insulating casting. The traction gear and the drive motor are connected in a transmission manner.

[0016] Optionally, it also includes a base bracket, which is located at the bottom of the insulating casting body, and the height of the base bracket is greater than the length of the grounding terminal extending out of the insulating casting body.

[0017] In summary, this application includes at least one of the following beneficial technical effects:

[0018] 1. By setting up an independent second shielding enclosure to house two voltage transformers, and configuring first shielding enclosures with built-in current transformers on both sides, physical isolation and independent electromagnetic shielding are achieved between the current transformers and voltage transformers. This cuts off the coupling path between the strong magnetic field generated by the current transformer during operation and the voltage transformer, effectively suppressing measurement signal distortion caused by internal electromagnetic interference, thereby improving measurement accuracy and equipment reliability. The first and second shielding enclosures are made of conductive materials and connected to a grounding terminal that extends through the insulating cast body via a unified grounding busbar. This ensures that each shielding enclosure is at the same grounding potential, avoiding secondary discharge or high-frequency interference caused by potential differences. Simultaneously, it forms a balanced internal electromagnetic shielding system, safely discharging interference signals to the ground, further improving electromagnetic interference resistance and operational safety.

[0019] 2. By designing the first shielding shell as a cylinder and fixing it with a metal spiral coil, a multi-functional integrated enhancement is achieved. The cylindrical structure facilitates the uniform distribution of electric and magnetic fields, while the outer metal spiral coil first forms an additional layer of electromagnetic shielding, enhancing the local electromagnetic shielding effect. Furthermore, the spiral coil, as a rigid metal component embedded and fixed to the outside of the first shielding shell, increases the mechanical contact and bonding area between the shielding body and the insulating casting after it is encapsulated by the insulating casting. After the casting solidifies, a strong mechanical interlocking effect is formed, which helps improve the overall structural stability and avoids the risk of cracking or loosening at the interface of different materials under temperature cycling, mechanical vibration, or internal electrodynamic impact, thereby improving the mechanical reliability and long-term lifespan of the product. Simultaneously, the metal spiral coil also provides a structural foundation for the subsequent active cooling system, allowing the cooling medium to flow tightly around the current transformer, which is the main heat source, creating conditions for efficient heat dissipation.

[0020] 3. By circulating water or an electromagnetically conductive fluid within the spiral coil, an active cooling system is formed to facilitate heat dissipation for the current transformer. When water flows through the spiral coil, forced convection heat transfer is achieved, directly carrying away the Joule heat and core loss heat generated during operation, preventing heat accumulation that could lead to aging of the insulating casting material. When an electromagnetically conductive fluid flows through the spiral coil, while achieving active cooling, the conductive and magnetic nanoparticles inherent in the coil form a liquid shielding layer that coils around the outside of the first shielding shell. This layer further attenuates electromagnetic waves through absorption and reflection mechanisms, achieving integrated functions of thermal management and electromagnetic shielding.

[0021] 4. By installing a toggle mechanism inside the spiral coil, the purpose of actively intervening in the internal fluid state of the spiral coil can be achieved. For ordinary cooling water, the movement of the toggle mechanism can disrupt the laminar boundary layer inside the fluid, generating turbulence and enhancing heat transfer efficiency. For electromagnetically conductive fluids, while improving heat transfer efficiency, it can prevent solid particles in the electromagnetically conductive fluid from depositing at the bottom of the spiral coil due to gravity or magnetic force, thereby avoiding flow channel blockage, decreased heat transfer efficiency, and unstable electromagnetic shielding performance caused by uneven distribution of solid particles in the electromagnetically conductive fluid, ensuring long-term, homogeneous operation of the fluid medium. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a current and voltage transformer with anti-electromagnetic interference function according to an embodiment of this application.

[0023] Figure 2 This is a cross-sectional view illustrating the internal structure of the insulating casting in the embodiments of this application.

[0024] Figure 3 This is a structural schematic diagram illustrating the positional relationship between the first shielding shell and the second shielding shell in the embodiments of this application.

[0025] Figure 4 This is a cross-sectional view showing the positional relationship between the first shielding shell and its corresponding spiral coil in the embodiments of this application.

[0026] Figure 5 This is a cross-sectional view showing the inlet end of the spiral coil in the embodiment of this application.

[0027] Figure 6 yes Figure 5 A magnified view of a portion of point A in the middle.

[0028] Figure 7 This is a schematic diagram illustrating the structure of the spiral guide tube and the actuating mechanism in the embodiments of this application.

[0029] Figure 8 This is a cross-sectional view showing the outlet end of the spiral coil in the embodiments of this application.

[0030] Figure 9 yes Figure 8 A magnified view of a portion of point B in the middle.

[0031] Figure 10 This is a schematic diagram illustrating the structure of the traction component in the embodiments of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Insulating casting body; 11. Drive motor; 111. Drive gear; 12. Intermediate gear; 2. First shielding shell; 21. Current transformer; 3. Second shielding shell; 31. Voltage transformer; 32. Lead wire hole; 33. Insulating ring; 4. Grounding busbar; 41. Grounding terminal; 5. Base bracket; 6. Spiral coil; 61. Inlet end; 62. Outlet end; 63. Spiral guide tube; 631. Spiral notch; 64. Fixing plate; 65. Lead-out tube; 66. Arc-shaped transition section; 7. Actuating mechanism; 71. Flexible rope; 72. Actuating plate; 73. Connector; 74. Traction assembly; 741. Reel; 742. Reel; 743. Traction gear; 75. Tension spring; 8. Main input pipe; 81. Diverter pipe; 9. Main output pipe; 91. Busbar. Detailed Implementation

[0033] The following combination Figures 1-10 This application will be described in further detail below. Example

[0034] This application discloses a current and voltage transformer with electromagnetic interference suppression function. (Refer to...) Figure 1 and Figure 3 An electromagnetic interference-resistant current and voltage transformer includes an insulating cast body 1, a second shielding shell 3, two first shielding shells 2, and a grounding busbar 4 encapsulated within the insulating cast body 1. Two voltage transformers 31 are installed within the second shielding shell 3, and one current transformer 21 is installed within each of the first shielding shells 2. The two first shielding shells 2 are respectively located on opposite sides of the second shielding shell 3. Both the first shielding shells 2 and the second shielding shell 3 are made of conductive material. The grounding busbar 4 is connected to both the second shielding shell 3 and the two first shielding shells 2, and a grounding terminal 41 is fixed to the grounding busbar 4, extending out of the insulating cast body 1. In this embodiment, the insulating cast body 1 is made of epoxy resin, and the first shielding shells 2 and the second shielding shells 3 can be made of copper, copper alloy, aluminum, or aluminum alloy. The first shielding shell 2 and the second shielding shell 3 are also provided with lead wire holes 32, and an insulating ring 33 is fixed at the lead wire holes 32 to ensure the electrical clearance and creepage distance between the lead wire or conductive lead rod and the first shielding shell 2 or the second shielding shell 3, and to prevent surface discharge or breakdown accidents.

[0035] This application achieves physical isolation and independent electromagnetic shielding between the current transformer 21 and the voltage transformer 31 by setting up an independent second shielding housing 3 to accommodate two voltage transformers 31, and configuring first shielding housings 2 with built-in current transformers 21 on both sides. This cuts off the coupling path between the strong magnetic field generated by the current transformer 21 during operation and the voltage transformer 31, effectively suppressing the distortion of measurement signals caused by internal electromagnetic interference, thereby improving measurement accuracy and equipment reliability. The first shielding housing 2 and the second shielding housing 3 are made of conductive material and are connected to a grounding terminal 41 that extends out of the insulating casting body 1 through a unified grounding busbar 4, ensuring that each shielding housing is at the same grounding potential, avoiding secondary discharge or high-frequency interference caused by potential difference, and forming a balanced internal electromagnetic shielding system, safely discharging interference signals to the ground, further improving electromagnetic interference resistance and safety of use.

[0036] Reference Figure 1 and Figure 2 The bottom of the insulating casting 1 is detachably fixed with a base bracket 5 by bolts, and the height of the base bracket 5 is greater than the length of the grounding terminal 41 extending out of the insulating casting 1. When the current and voltage transformer is installed on the mounting surface, the grounding terminal 41 is ensured to be suspended above the mounting surface, while the base bracket 5 bears the entire weight, thereby preventing the grounding terminal 41 from being bent or damaged, and ensuring the long-term reliability of the grounding connection.

[0037] Reference Figure 3 and Figure 4 The first shielding shell 2 is cylindrical, and a spiral coil 6 is coiled and fixed on its outer side. The spiral coil 6 is made of metal and is sealed in an insulating casting body 1. Both ends of the spiral coil 6 protrude from the insulating casting body 1, with the upper end being the inlet end 61 and the lower end being the outlet end 62. Water or an electromagnetically conductive fluid flows inside the spiral coil 6. By designing the first shielding shell 2 as a cylinder and fixing the metal spiral coil 6, a multi-functional integrated lifting effect is achieved. The cylindrical structure facilitates the uniform distribution of electric and magnetic fields, while the outer metal spiral coil 6 first forms an additional layer of electromagnetic shielding, enhancing the local electromagnetic shielding effect. In addition, the spiral coil 6 is embedded and fixed to the outside of the first shielding shell 2 as a rigid metal component. After it is covered and sealed by the insulating casting body 1, its coil structure increases the mechanical contact and bonding area between the shielding body and the insulating casting body 1. After the casting body is cured, it can form a strong mechanical interlocking effect, which is conducive to improving the stability of the overall structure and avoiding the risk of cracking or loosening at the interface of different materials under temperature cycling, mechanical vibration or internal electrodynamic impact, thereby improving the mechanical reliability and long-term life of the product.

[0038] When water flows through the spiral coil 6, forced convection heat transfer is achieved for the current transformer 21, directly carrying away the Joule heat and core loss heat generated during operation, preventing heat accumulation that could lead to aging of the insulating casting 1 material. When conductive electromagnetic fluid flows through the spiral coil 6, while achieving active heat dissipation, the conductive and magnetic nanoparticles it contains form a liquid shielding layer that coils around the outside of the first shielding shell 2. This layer further attenuates electromagnetic waves through absorption and reflection mechanisms, achieving the integration of thermal management and electromagnetic shielding functions.

[0039] Reference Figures 4-7 The spiral coil 6 is equipped with a toggle mechanism 7 that can move along its own winding direction. The toggle mechanism 7 includes a flexible rope 71 and multiple toggle plates 72. Each toggle plate 72 is fixed to one side of the flexible rope 71 by a connector 73, and the multiple toggle plates are arranged at equal intervals on one side of the flexible rope 71. A spiral guide tube 63 is fixed to the outer side of the inner wall of the spiral coil 6. A spiral groove 631 is opened on the inner side of the spiral guide tube 63, and the helix angle of the spiral guide tube 63 and the spiral groove 631 is the same as the helix angle of the spiral coil 6. The flexible rope 71 passes through the spiral guide tube 63, and the connector 73 is housed in the spiral groove 631 and can slide along the spiral groove 631. One end of the flexible rope 71 is connected to a traction component 74. In use, the traction component 74 can pull the flexible rope 71, so that the flexible rope 71 moves along the spiral guide tube 63, thereby driving the toggle plates 72 to move inside the spiral coil 6. The spiral guide tube 63 and the spiral notch 631 guide the movement of the flexible rope 71 and the connector 73, respectively, avoiding possible swaying, twisting, or knotting of the flexible rope 71 in the long pipe, and ensuring that the agitator 72 can always move precisely along the winding direction of the spiral coil 6, thereby disturbing the fluid inside the spiral coil 6. When the fluid inside the spiral coil 6 is ordinary cooling water, the movement of the agitator 7 can disrupt the laminar boundary layer inside the fluid, generating turbulence and enhancing heat transfer efficiency. When the fluid inside the spiral coil 6 is an electromagnetically conductive fluid, while improving heat transfer efficiency, it can prevent solid particles in the electromagnetically conductive fluid from depositing at the bottom of the spiral coil 6 due to gravity or magnetic force, thereby avoiding flow channel blockage, decreased heat transfer efficiency, and unstable electromagnetic shielding performance caused by uneven distribution of solid particles in the electromagnetically conductive fluid, ensuring long-term and homogeneous operation of the fluid medium.

[0040] Reference Figure 6 The connecting part 73 is a connecting round rod, so that its contact with the spiral cut groove 631 is a smooth line contact, which can effectively reduce the friction and wear of the connecting part 73 itself and the groove wall of the spiral cut groove 631 during the movement, and improve the service life and long-term operation stability of the entire actuation mechanism 7.

[0041] Reference Figures 4-6A tension spring 75 is connected to the end of the flexible rope 71 furthest from the traction component 74. The outer diameter of the tension spring 75 is larger than the inner diameter of the spiral guide tube 63. A fixing plate 64 is fixed to the inner wall of the spiral coil 6. The end of the tension spring 75 furthest from the flexible rope 71 is fixed to the fixing plate 64. The tension spring 75 is positioned near the inlet end 61 of the spiral coil 6. Thus, by setting the tension spring 75, an automatic reset and continuous tension function is introduced. After the traction component 74 completes traction in one direction, the tension spring 75 provides a restoring force to pull the actuating mechanism 7 back to its initial position, preparing for the next actuation operation, achieving automated cyclic operation. The outer diameter of the tension spring 75, being larger than the inner diameter of the spiral guide tube 63, acts as a mechanical stop, preventing the tension spring 75 from being accidentally pulled into the spiral guide tube 63. Furthermore, the preload of the tension spring 75 ensures that the flexible rope 71 is always taut, compensating for minor changes in the flexible rope 71 and reducing the possibility of the actuating mechanism 7 failing due to slack in the flexible rope 71.

[0042] Reference Figure 4 , Figure 8 and Figure 9 A vertically upward-leading outlet pipe 65 is fixed to the outer side of the outlet end 62 of the spiral coil 6. The lower end of the outlet pipe 65 communicates with the cavity of the spiral coil 6. The end of the flexible rope 71 away from the tension spring 75 passes through the spiral coil 6 and the outlet pipe 65 in sequence and is connected to the traction assembly 74. The traction assembly 74 is located on the outer side of the insulating casting body 1. To avoid wear between the flexible rope 71 and the ends of the spiral coil 6 and the outlet pipe 65 during movement, an arc-shaped transition section 66 is fixed between the spiral coil 6 and the outlet pipe 65. The flexible rope 71 is bent and turned at the arc-shaped transition section 66, and the arc-shaped transition section 66 is located on the inner side of the bend of the flexible rope 71 at that point. In this embodiment, the arc-shaped transition section 66 is a longitudinally cut tubular component bent into an arc shape. Placing the traction assembly 74 externally within the insulating casting body 1 minimizes the need for complex internal channels or cavities for moving parts within the insulating casting body 1, ensuring the integrity and sealing of the insulating casting body 1. Simultaneously, the external arrangement facilitates the installation, adjustment, and replacement of the traction assembly 74, improving product maintainability. When the flexible rope 71 moves within the fluid-filled spiral coil 6 and is pulled out of the spiral coil 6, some fluid medium inevitably adheres to and carries away from its surface. Through the vertically upward-facing outlet pipe 65 structure, in addition to leading the flexible rope 71 out from one side of the spiral coil 6, gravity can be used to create a return channel for the fluid carried out by the flexible rope 71. The carried-out fluid, unable to continue upward due to its own gravity, flows back along the surface of the flexible rope 71 through the outlet pipe 65 into the cavity of the spiral coil 6, thereby reducing abnormal loss of the working fluid and helping to maintain the stability of the cooling or shielding medium capacity within the spiral coil 6, thus ensuring long-term stability of thermal management and electromagnetic shielding effectiveness.

[0043] Reference Figure 4 , Figure 7 and Figure 10 The traction assembly 74 includes a reel 741, a shaft 742, and a traction gear 743. The reel 741 and the traction gear 743 are coaxially fixed to the shaft 742. The shaft 742 is rotatably mounted on the outer wall of the insulating casting body 1. The end of the flexible rope 71 away from the tension spring 75 is fixedly connected to the wheel surface of the reel 741. A drive motor 11 is also installed and fixed on the outer wall of the insulating casting body 1. A drive gear 111 is coaxially fixed to the output end of the drive motor 11. An intermediate gear 12 is rotatably connected to the outer wall of the insulating casting body 1. The intermediate gear 12 meshes with both the drive gear 111 and the traction gear 743. Thus, the traction gear 743 and the drive motor 11 are connected by transmission. The drive motor 11 can drive the traction gear 743 to rotate. The rotation of the traction gear 743 drives the winding shaft 742 and the winding wheel 741 to rotate. The rotation of the winding wheel 741 can realize the winding and unwinding operation of one end of the flexible rope 71. With the cooperation of the tension spring 75 at the other end of the flexible rope 71, the reciprocating traction of the flexible rope 71 can be realized, ensuring the long-term stability of the cyclic winding operation of the actuating mechanism 7.

[0044] Reference Figure 3 To achieve synchronized thermal management and / or electromagnetic shielding of the two current transformers 21 in this combined current and voltage transformer, the inlet ends 61 of the two spiral coils 6 are connected through a shunt pipe 81, with a main input pipe 8 connected to one side of the shunt pipe 81; the outlet ends 62 of the two spiral coils 6 are connected through a manifold 91, with a main output pipe 9 connected to one side of the manifold 91. During installation, the main input pipe 8 is connected to an external fluid supply device, and the main output pipe 9 is connected to an external fluid recovery device, or both the main input pipe 8 and the main output pipe 9 are simultaneously connected to the two ends of an external fluid self-circulation device. This ensures that completely consistent fluid inlet pressure, temperature, and component concentration are simultaneously delivered to the two independent spiral coils 6, which helps to avoid differences in heat dissipation efficiency or fluctuations in electromagnetic shielding effectiveness caused by uneven fluid supply, and achieves strict synchronous control of the two current transformers 21 in terms of thermal load and electromagnetic environment. Furthermore, by connecting the two spiral coils 6 in parallel, it is beneficial to reduce the interface requirements and configuration complexity of the external fluid management system. Compared with the traditional approach of configuring external devices independently for each spiral coil 6, this application only requires a centralized external fluid supply device, an external fluid recovery device, or an external fluid self-circulation device, thereby reducing the number of equipment purchases, installation connection points, and pipeline laying, which helps to reduce actual operating costs and installation complexity. At the same time, it simplifies later maintenance and improves the economic efficiency of the entire life cycle of this application.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A current and voltage transformer with electromagnetic interference suppression function, comprising an insulating casting body (1), characterized in that: It also includes a second shielding shell (3), two first shielding shells (2), and a grounding busbar (4) enclosed within the insulating casting body (1); the second shielding shell (3) is provided with two voltage transformers (31), each of the first shielding shells (2) is provided with a current transformer (21), and the two first shielding shells (2) are respectively located on both sides of the second shielding shell (3); the first shielding shells (2) and the second shielding shells (3) are made of conductive material; the grounding busbar (4) is connected to both the second shielding shell (3) and the two first shielding shells (2), and the grounding busbar (4) is provided with a grounding terminal (41), which extends out of the insulating casting body (1); The first shielding shell (2) is cylindrical, and a spiral coil (6) is coiled and fixed on the outer side of the first shielding shell (2). The spiral coil (6) is made of metal and is sealed in the insulating casting body (1). Both ends of the spiral coil (6) protrude from the insulating casting body (1). The spiral coil (6) is provided with a toggle mechanism (7) that can move along its own coiling direction. The toggle mechanism (7) includes a flexible rope (71) and multiple toggle plates (72). Each toggle plate (72) is fixed to one side of the flexible rope (71) by a connector (73). The outer side of the inner wall of the spiral coil (6) is provided with a spiral guide tube (63). The inner side of the spiral guide tube (63) is provided with a spiral groove (631). The spiral helix angle of the spiral guide tube (63) and the spiral groove (631) is the same as the spiral helix angle of the spiral coil (6). The flexible rope (71) passes through the spiral guide tube (63). The connector (73) is housed in the spiral groove (631) and can slide along the spiral groove (631). One end of the flexible rope (71) is connected to a traction component (74).

2. A current and voltage transformer with anti-electromagnetic interference function according to claim 1, characterized in that: Water or an electromagnetic fluid flows inside the spiral coil (6). The upper end of the spiral coil (6) is the inlet end (61), and the lower end is the outlet end (62).

3. A current and voltage transformer with anti-electromagnetic interference function according to claim 1, characterized in that: The connector (73) is a connecting round rod.

4. A current and voltage transformer with anti-electromagnetic interference function according to claim 1 or 3, characterized in that: A tension spring (75) is provided at the end of the flexible rope (71) away from the traction assembly (74). The outer diameter of the tension spring (75) is larger than the inner diameter of the spiral guide tube (63). The end of the tension spring (75) away from the flexible rope (71) is fixed to the inner wall of the spiral coil (6). The tension spring (75) is located near the inlet end (61) of the spiral coil (6).

5. A current and voltage transformer with anti-electromagnetic interference function according to claim 4, characterized in that: The spiral coil (6) has a vertically upward-leading outlet pipe (65) on the outside of the outlet end (62). The lower end of the outlet pipe (65) is connected to the cavity of the spiral coil (6). The end of the flexible rope (71) away from the tension spring (75) passes through the spiral coil (6) and the outlet pipe (65) in sequence and is connected to the traction assembly (74). The traction assembly (74) is located on the outside of the insulating casting body (1).

6. A current and voltage transformer with anti-electromagnetic interference function according to claim 5, characterized in that: The traction assembly (74) includes a reel (741), a shaft (742), and a traction gear (743). The reel (741) and the traction gear (743) are coaxially fixed with the shaft (742). The shaft (742) is rotatably disposed on the outside of the insulating casting body (1). The end of the flexible rope (71) away from the tension spring (75) is connected to the wheel surface of the reel (741). A drive motor (11) is also provided on the outside of the insulating casting body (1). The traction gear (743) and the drive motor (11) are connected in a transmission.

7. A current and voltage transformer with anti-electromagnetic interference function according to claim 1, characterized in that: It also includes a base bracket (5), which is located at the bottom of the insulating casting body (1), and the height of the base bracket (5) is greater than the length of the grounding terminal (41) extending out of the insulating casting body (1).

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