Current transformer with external shield protection structure

Abstract

The application discloses a current transformer with an external shielding protection structure and relates to the technical field of current transformers. The current transformer shielding structure is improved in view of the problems of insufficient single-direction magnetic field protection and contradiction between shielding and heat dissipation. The current transformer body is provided with a shielding assembly composed of a magnetic sensing side plate and a fixed side plate on the outside. The operation of the current transformer is divided into two stages, namely, self-operation and active intervention. In the self-operation stage, the shielding component is used to realize magnetic field isolation, and low-temperature water and spiral airflow are used to complete multi-stage heat dissipation. In the active intervention stage, the real-time magnetic field strength is used to drive the permanent magnetic beads to move directionally to strengthen the magnetic field protection, and the power of the air pump is adjusted to improve the heat dissipation efficiency, so that the integrated mode of multi-dimensional magnetic field shielding and high-efficiency heat dissipation is formed, and the measurement accuracy and operation life of the current transformer under strong electromagnetic radiation and high-load working conditions are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of current transformer technology, and more specifically to current transformers employing an externally shielded protection structure. Background Technology

[0002] Current transformers operate based on the law of electromagnetic induction and have a structure similar to transformers. Their key functions are current conversion and electrical isolation. To explain their structure, the key component is the magnetic flux device composed of the winding coil and the iron core. Therefore, the magnetic field environment can be understood as a key factor affecting the performance of the transformer.

[0003] Considering both the operating environment and accuracy: if the instrument transformer is installed in areas with strong electromagnetic radiation, such as high-voltage switchgear or substations, the stray magnetic fields generated by numerous busbars, circuit breakers, and other equipment will interfere with the magnetic flux distribution in the core, leading to increased measurement errors and even affecting the reliability of the protection device. Adding an external shielding structure is the simplest and most effective solution (core-wrapped shielding only protects against magnetic fields in a single direction, and is insufficient for multi-dimensional stray magnetic fields (such as cross-magnetic fields from busbars within the switchgear or coupled magnetic fields from multiple instrument transformers)). Conventionally, a metal shielding shell (such as a copper, aluminum, or steel shell) is added externally, which, after grounding, forms an electromagnetic shielding cavity. However, the following problems still exist during actual operation: Fully enclosed metal shielding can prevent the heat generated during the operation of the current transformer from dissipating. Long-term high temperature can affect the accuracy and lifespan of the current transformer, especially in complex operating environments, such as high-frequency harmonic magnetic fields generated by power equipment and the mutual influence of multiple current transformers, which can exacerbate the error rate of the magnetic flux components in the current transformer.

[0004] Based on the above, this invention proposes a solution. Summary of the Invention

[0005] The purpose of this invention is to provide a current transformer with an externally shielded protection structure. It is explained in terms of actual operating environment. A single iron core-wrapped type can only resist magnetic fields in one direction and has the problem of insufficient protection. However, when an externally shielded structure is used, there is a contradiction between heat dissipation and shielding protection.

[0006] The objective of this invention can be achieved through the following technical solution: a current transformer with an externally mounted shielded protection structure, including a transformer body, a shielding kit consisting of a magnetic side plate and a fixed side plate is provided outside the transformer body, and an air pump is provided according to the installation position of the transformer body. The magnetic induction side plate and the fixed side plate are arranged opposite each other along the transformer body, and the setting direction of the magnetic induction side plate matches the wiring direction in the transformer body. The magnetic induction side plate is provided with a shielding positioning plate, an active winding coil position and an external fixing plate in sequence along the outward direction of the outer surface of the transformer body. A rubber sheet is provided on the outside of the external fixing plate, and a cooling water tank is formed between the external fixing plate and the rubber sheet.

[0007] Further configuration: the magnetic side plate is provided with wiring holes corresponding to the transformer body, and the cooling water tank is provided with multiple sets of spiral airflow channels.

[0008] The configuration is further defined as follows: the spiral airflow channels are arranged linearly and equidistantly along the routing direction in the transformer body, and the number of spiral airflow channels is two or more.

[0009] The configuration is further defined as follows: each spiral airflow channel is numbered i along the routing direction in the transformer body, the end positions of the spiral airflow channels in two adjacent positions are kept connected, and the first positions of the spiral airflow channels in two adjacent positions are kept connected or the first position of one of the spiral airflow channels extends to the outside of the rubber sheet.

[0010] The configuration is further defined as follows: two of the first sections of the multiple sets of spiral airflow channels extend to the outer part of the rubber sheet and are respectively configured as an air inlet and an air outlet.

[0011] A further configuration is provided: a permanent magnet bead matching the position of the active winding coil is provided between the spiral airflow channels in two adjacent positions, and the permanent magnet bead is arranged linearly and equidistantly along the spiral line of the spiral airflow channel.

[0012] The setting is further configured such that the diameter of the permanent magnet bead is equal to the linear distance between the spiral airflow channels in two adjacent positions.

[0013] Further configuration: During use, it includes magnetic shielding and cooling actions, and the magnetic shielding and cooling actions are divided into a self-operation phase and an active intervention phase; Self-operation phase: The shielding positioning plate and external fixing plate are used to isolate the magnetic fields inside and outside the transformer body. A certain amount of low temperature water is injected into the cooling water tank to cool the transformer body. Cold air is blown into the spiral airflow channel through the air inlet and air outlet. Active intervention phase: During the self-operation phase, the magnetic field strength of the internal environment of the transformer body is acquired in real time. Based on the magnetic field strength, action commands are sent to the active winding coil position and the air pump. After the active winding coil position is energized and magnetized, it drives the permanent magnet bead to move in a directional spiral. The output power of the air pump is adjusted to change the flow rate of cold air in the spiral airflow channel.

[0014] The present invention has the following beneficial effects: 1. This invention abandons the traditional single-core enclosed shielding structure and adopts an external shielding kit composed of a magnetic side plate and a fixed side plate. The shielding positioning plate on the magnetic side plate and the external fixed plate can be made of magnetic shielding material or coated with magnetic shielding coating to form a double-layer closed magnetic field protection barrier. It can effectively resist the interference of complex stray magnetic fields such as bus cross magnetic fields and multi-transformer coupled magnetic fields in high-voltage switchgear, substations and other scenarios. It avoids the external magnetic field disturbing the magnetic field distribution of the internal magnetic flux components, and ensures the basic accuracy of current conversion and electrical isolation. Specifically, it is mainly based on the active intervention stage. The active winding coil position can generate a directional magnetic field according to the real-time magnetic field strength, driving the permanent magnet bead to move in a directional spiral along the spiral airflow channel. The magnetic field of the permanent magnet bead itself can not only directly cancel the local excessive stray magnetic field, but also disturb the external magnetic field distribution trajectory, realizing the dynamic and accurate improvement of magnetic field protection strength, and further reducing measurement error.

[0015] 2. The main structure constructs a multi-stage heat dissipation link of "body heat conduction - low-temperature water heat storage - spiral airflow heat exchange". The external fixed plate and shielding positioning plate have excellent thermal conductivity, which can quickly conduct the heat generated by the operation of the instrument transformer body to the low-temperature water in the cooling water tank. The spiral airflow channels are arranged linearly and equidistantly along the routing direction, and the ends of adjacent channels are connected. When the cold air delivered by the air pump flows along the spiral path, it comes into full contact with the low-temperature water to complete indirect heat exchange. The spiral structure prolongs the airflow residence time and increases the heat exchange area, achieving efficient heat removal without compromising the integrity of the shield. This solves the problem of heat accumulation caused by fully enclosed metal shields. In the active intervention stage, the air pump can adjust the output power according to the degree of magnetic field exceedance (synchronously related to equipment load and heat generation) to increase the cold air flow rate. At the same time, the movement of the permanent magnet beads will disturb the airflow and break the laminar flow state, enhancing the heat exchange effect. This achieves dynamic matching between heat dissipation efficiency and equipment heat generation rate, avoiding sudden temperature rise under high load conditions and ensuring the operational stability of the instrument transformer. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the current transformer with an externally mounted shielded protection structure proposed in this invention; Figure 2 In this invention Figure 1 A split diagram; Figure 3 This is a schematic diagram of the magnetic side plate in this invention; Figure 4 For the present invention Figure 3 Cross-sectional view; Figure 5 This is a schematic diagram of the spiral airflow channel of the present invention; Figure 6 This is a side cross-sectional view of the magnetic side plate in this invention.

[0018] In the diagram: 1. Current transformer body; 2. Magnetic side plate; 3. Fixed side plate; 4. Spiral airflow channel; 5. Permanent magnet bead; 101. Wiring hole; 102. Cooling water tank; 103. External fixing plate; 104. Active winding coil position; 105. Shielding positioning plate; 106. Rubber sheet. Detailed Implementation

[0019] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1: This example addresses the practical operating environment. A single iron core-encased shielding structure can only resist magnetic fields in one direction, resulting in insufficient protection. However, using an external shielding structure presents a contradiction between heat dissipation and shielding protection. The following technical solution is proposed to address this: Reference Figures 1-6 The current transformer with an external shielding protection structure in this embodiment includes a transformer body 1, a shielding kit consisting of a magnetic side plate 2 and a fixed side plate 3 is provided outside the transformer body 1, and an air pump is provided according to the installation position of the transformer body 1. The magnetic induction side plate 2 and the fixed side plate 3 are arranged opposite to each other along the transformer body 1, and the setting direction of the magnetic induction side plate 2 matches the wiring direction in the transformer body 1. The magnetic induction side plate 2 is provided with a shielding positioning plate 105, an active winding coil position 104, and an external fixing plate 103 in sequence along the direction of outward extension of the outer surface of the transformer body 1. A rubber sheet 106 is provided on the outside of the external fixing plate 103, and a cooling water chamber 102 is formed between the external fixing plate 103 and the rubber sheet 106.

[0021] Basic Structure Description: A brief explanation of the operating principle of the current transformer is provided: the key point is the change in its internal magnetic field. However, considering its installation location, it is highly susceptible to external environmental influences (electronic equipment), which can cause unpredictable fluctuations in the magnetic field and affect its performance. Therefore, this invention employs an externally shielded structure to... Figure 1 and Figure 6For example, the foundation lies in the shielding positioning plate 105, the fixed side plate 3, and the external fixing plate 103. The materials used can be selected or magnetic shielding materials can be applied to the surfaces of the three components to achieve the function of shielding the magnetic field. This part will not be explained in detail. The key aspect of this invention lies in the contradiction between heat dissipation and magnetic shielding. To address this, the invention is based on the shielding positioning plate 105 and the external fixing plate 103, both of which have good heat transfer properties. The cooling water tank 102 serves as the cooling unit, and an air pump drives the airflow. Its key function is that the spiral airflow channel 4 maintains contact with the low-temperature water in the cooling water tank, and the heat dissipation process is completed through indirect heat exchange during the airflow process. Essentially, the airflow "carries away" the heat from the low-temperature water, while the low-temperature water is mainly used to transfer the heat in the transformer body 1, thereby forming multiple heat exchange processes. Its key purpose is to maintain the heat dissipation process on the basis of magnetic shielding.

[0022] Example 2: Supplementing the structure and operation of the shielding kit in Example 1: The magnetic side plate 2 has a wiring hole 101 corresponding to the transformer body 1. The cooling water tank 102 is provided with multiple sets of spiral airflow channels 4. The spiral airflow channels 4 are arranged linearly and equidistantly along the wiring direction in the transformer body 1. The number of spiral airflow channels 4 is two or more. Each spiral airflow channel 4 is numbered i along the wiring direction in the transformer body 1. The end positions of two adjacent spiral airflow channels 4 are connected. The first positions of two adjacent spiral airflow channels 4 are connected or the first position of one of the spiral airflow channels 4 extends to the outside of the rubber sheet 106. Two of the first positions of the multiple sets of spiral airflow channels 4 extend to the outside of the rubber sheet 106 and are respectively set as air inlet and air outlet. A permanent magnet bead 5 matching the active winding coil position 104 is provided between two adjacent spiral airflow channels 4. The permanent magnet bead 5 is arranged linearly and equidistantly along the spiral line of the spiral airflow channel 4. The diameter of the permanent magnet bead 5 is equal to the linear distance between the two adjacent spiral airflow channels 4. The process includes magnetic shielding and cooling actions, which are further divided into a self-operation phase and an active intervention phase. During the self-operation phase: the shielding positioning plate 105 and the external fixing plate 103 are used to isolate the magnetic fields inside and outside the transformer body 1. A certain amount of low temperature water is injected into the cooling water tank 102 to cool the transformer body 1. Cold air is blown into the spiral airflow channel 4 through the air inlet and air outlet. Active intervention phase: During the self-operation phase, the magnetic field strength of the internal environment of the transformer body 1 is acquired in real time. Based on the magnetic field strength, action commands are sent to the active winding coil position 104 and the air pump. After the active winding coil position 104 is energized and magnetized, it drives the permanent magnet bead 5 to move in a directional spiral. The output power of the air pump is adjusted to change the flow rate of cold air in the spiral airflow channel 4.

[0023] Solution Description: Based on the law of electromagnetic induction, the basic work of current conversion and electrical isolation is completed. The internal magnetic flux component (winding coil + iron core) generates a stable magnetic field to ensure the basic accuracy of current measurement. During its continuous operation, temperature changes will inevitably occur. This invention is based on a shielding kit. In strong electromagnetic radiation scenarios such as high-voltage switchgear and substations, traditional iron core-wrapped shielding can only resist magnetic fields in a single direction, while fully enclosed metal shielding is prone to heat accumulation. Therefore, this embodiment constructs a basic structure that integrates external shielding and multi-level heat dissipation. The core components of this current transformer include the transformer body 1, the shielding kit, and the cooling unit. The transformer body 1 undertakes the core functions of current conversion and electrical isolation. The magnetic field stability of its internal magnetic flux components directly determines the measurement accuracy. The shielding kit consists of a magnetic induction side plate 2 and a fixed side plate 3 facing each other and surrounding the outside of the body. The arrangement direction of the magnetic induction side plate 2 is precisely matched with the internal wiring direction of the body. From the inside to the outside, a shielding positioning plate 105, an active winding coil position 104, and an external fixing plate 103 are arranged in sequence. The shielding positioning plate 105 and the external fixing plate 103 can be made of magnetic shielding material or coated with a magnetic shielding coating to form a multi-dimensional magnetic field protection barrier, which can effectively resist the interference of complex stray magnetic fields such as bus cross magnetic fields and multi-transformer coupled magnetic fields. The design of the cooling unit is the key to resolving the contradiction between shielding and heat dissipation. A rubber sheet 106 is added to the outside of the external fixing plate 103, and the two form a cooling water tank 102. The low-temperature water pre-filled in the tank can quickly absorb the heat generated by the main body through the high thermal conductivity of the external fixing plate 103. At the same time, an air pump is provided to transfer the heat outward through the airflow channels that are subsequently laid out, thus constructing a basic heat dissipation link of "main body heat conduction - low-temperature water heat storage" and completing the initial cooling without destroying the integrity of the shielding. Based on the above, the operation process of the spiral airflow channel is supplemented as follows: S1: Multiple sets of spiral airflow channels 4 are linearly and equidistantly arranged in the cooling water tank 102 along the main body routing direction. The ends of adjacent channels are interconnected, and the first section of the two sets of channels passes through the rubber sheet 106 to form an air inlet and an air outlet. When the cold air delivered by the air pump flows along the spiral path, it comes into full contact with the low-temperature water in the tank to complete indirect heat exchange. The spiral structure not only extends the airflow residence time and increases the heat exchange area, but also avoids airflow short circuits, allowing the heat absorbed by the low-temperature water to be efficiently carried out. This upgrades the basic heat dissipation link to a multi-stage system of "main body heat conduction - low-temperature water heat storage - spiral airflow heat exchange", maximizing the heat dissipation efficiency under shielded conditions. S2: The permanent magnet beads 5 are equidistantly arranged along the spiral line of the spiral airflow channel, and their diameter is precisely matched with the linear distance between adjacent channels. They can move directionally under the magnetic field drive of the active winding coil position 104. When the active winding coil position 104 is energized and magnetized, the spiral movement of the permanent magnet beads 5 can both disturb the airflow to break the laminar flow state and enhance the heat transfer effect, and can also use its own magnetic field to help cancel local stray magnetic fields, thus achieving the dual function of "heat dissipation enhancement" and "magnetic field compensation". Secondly, the key content of this invention lies in the transition process between the self-operation phase and the active intervention phase: S3: During the self-operation phase, the shielding positioning plate 105 and the external fixing plate 103, as core magnetic shielding components, form a closed magnetic field protection barrier surrounding the transformer body 1 by virtue of their magnetic shielding material properties or the magnetic shielding coating on their surfaces. Specifically, the shielding positioning plate 105 is in close contact with the outer surface of the transformer body 1, directly blocking the penetration of stray magnetic fields at close range; the external fixing plate 103 forms a second layer of protection on the outside. Together, they achieve physical isolation of the internal and external magnetic fields of the transformer body 1, preventing low-intensity stray magnetic fields generated by external busbars, circuit breakers, and other equipment from interfering with the magnetic field distribution of the internal magnetic flux components, ensuring basic measurement accuracy. The cooling process operates in a passive heat dissipation mode during the self-operation phase. S3-1: The external fixing plate 103 and the shielding positioning plate 105 have excellent thermal conductivity, which can quickly transfer the heat generated by the current transformer body 1 during operation to the low-temperature water in the cooling water tank 102. The low-temperature water acts as a heat carrier, realizing the transfer of heat from the core area of ​​the equipment to the external cooling unit, avoiding the accumulation of heat inside the body. The air pump operates at a preset constant power, pumping external cold air into the air inlet through the spiral airflow channel 4. When the cold air flows along the spiral path, it comes into full contact with the low-temperature water in the cooling water tank 102 to complete indirect heat exchange. The hot air that has absorbed heat is finally discharged from the air outlet. The equidistant linear arrangement design of the spiral airflow channel 4 can ensure uniform heat dissipation of low-temperature water in all areas of the cooling water tank, avoid local heat dissipation dead zones, and maintain the stable operating temperature of the current transformer body 1. During the self-operation phase, both the magnetic isolation and cooling systems are in a stable low-power operation state, which can meet the operating requirements of the instrument transformer under normal power grid conditions, taking into account both equipment stability and energy economy. S4: When the electromagnetic interference intensity of the environment where the transformer body 1 is located or its own operating load exceeds the normal threshold, the system will automatically switch to the active intervention stage. Relying on the magnetic field monitoring data and component linkage control, the magnetic isolation strength and heat dissipation efficiency will be dynamically adjusted to adapt to extreme scenarios with strong electromagnetic radiation and high load, such as high voltage switchgear and substations. The system has a built-in magnetic field strength monitoring sensor that can collect real-time magnetic field strength data around the magnetic flux components inside the transformer body 1 and compare it with a preset safety threshold. When the magnetic field strength is detected to continuously exceed the threshold (such as encountering a strong magnetic field at a bus crossing, interference from coupled magnetic fields of multiple transformers, or abnormal fluctuations in the internal magnetic field due to high load operation of the equipment), the system will immediately trigger an active intervention command to activate the linkage adjustment mechanism of magnetic isolation and cooling, generating the following actions: S4-1: Upon receiving the intervention command, the active winding coil position 104 automatically adjusts the current to generate a directional magnetic field of corresponding strength according to the degree of magnetic field exceedance. The diameter of the permanent magnet bead 5 is precisely matched with the linear distance of the adjacent spiral airflow channel 4. Under the magnetic force of the active winding coil position 104, it can move directionally along the spiral line of the spiral airflow channel. The permanent magnet bead 5 has a stable magnetic field of its own, and its movement process can form a dynamic magnetic field barrier. On the one hand, it can directly cancel the excessive stray magnetic field in the local area. On the other hand, it can disrupt the distribution trajectory of the external stray magnetic field through magnetic field disturbance, further weaken its interference to the internal magnetic flux of the transformer body 1, and achieve precise improvement of the magnetic isolation protection strength. S4-2: After receiving the intervention command, the air pump automatically adjusts its output power according to the degree of magnetic field exceedance (the higher the magnetic field strength exceeds the standard, the greater the equipment load and the more heat generated). This increases the flow rate of cold air in the spiral airflow channel 4. The increased flow rate can shorten the cold air heat exchange cycle, accelerate the heat removal efficiency of low-temperature water, and avoid a sudden temperature rise caused by a sudden increase in equipment load. The directional spiral movement of the permanent magnet bead 5 can synchronously disturb the cold air flow in the spiral airflow channel 4, break the laminar flow state of the airflow, and make the cold air more fully contacted with the channel wall (and the low-temperature water in the cooling water tank), further improving the heat exchange efficiency and achieving dynamic matching between heat dissipation efficiency and equipment heat generation rate.

[0024] Based on the above, when the magnetic field strength inside the transformer body 1 is detected to drop back to the safe threshold and stabilize, the system will gradually reduce the energizing intensity of the active winding coil position 104 and the output power of the air pump until it automatically switches back to the self-operation stage, realizing a seamless connection between the two-stage modes. This ensures equipment safety under extreme conditions and avoids energy waste caused by excessive intervention. Specifically, it forms an intelligent adaptation process of "passive maintenance under normal operating conditions + active adjustment under extreme operating conditions".

[0025] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to specific implementations. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A current transformer employing an externally shielded protection structure, comprising a transformer body (1), characterized in that, A shielding kit consisting of a magnetic side plate (2) and a fixed side plate (3) is provided outside the transformer body (1), and an air pump is provided according to the installation position of the transformer body (1). The magnetic induction side plate (2) and the fixed side plate (3) are arranged opposite to each other along the transformer body (1), and the setting direction of the magnetic induction side plate (2) matches the wiring direction in the transformer body (1). The magnetic induction side plate (2) is provided with a shielding positioning plate (105), an active winding coil position (104), and an external fixing plate (103) in sequence along the direction of outward extension of the outer surface of the transformer body (1). A rubber sheet (106) is provided on the outside of the external fixing plate (103), and a cooling water tank (102) is formed between the external fixing plate (103) and the rubber sheet (106).

2. The current transformer with an externally mounted shielded protection structure according to claim 1, characterized in that, The magnetic side plate (2) is provided with wiring holes (101) corresponding to the transformer body (1), and the cooling water tank (102) is provided with multiple sets of spiral airflow channels (4).

3. The current transformer with an externally mounted shielded protection structure according to claim 2, characterized in that, The spiral airflow channels (4) are arranged linearly and equidistantly along the routing direction in the transformer body (1), and the number of spiral airflow channels (4) is two or more.

4. The current transformer with an externally mounted shielded protection structure according to claim 3, characterized in that, Each spiral airflow channel (4) is numbered i along the routing direction in the transformer body (1). The end positions of the spiral airflow channels (4) in two adjacent positions are kept connected, and the first positions of the spiral airflow channels (4) in two adjacent positions are kept connected or the first position of one of the spiral airflow channels (4) extends to the outside of the rubber sheet (106).

5. The current transformer with an externally mounted shielded protection structure according to claim 4, characterized in that, Two of the first sections of the multiple spiral airflow channels (4) extend to the outer position of the rubber sheet (106) and are respectively set as air inlets and air outlets.

6. The current transformer with an externally mounted shielded protection structure according to claim 5, characterized in that, A permanent magnet bead (5) matching the active winding coil position (104) is provided between the spiral airflow channels (4) in two adjacent positions. The permanent magnet bead (5) is arranged linearly and equidistantly along the spiral line of the spiral airflow channel (4).

7. The current transformer with an externally mounted shielded protection structure according to claim 6, characterized in that, The diameter of the permanent magnet bead (5) is equal to the linear distance between the spiral airflow channels (4) in two adjacent positions.

8. The current transformer with an externally mounted shielded protection structure according to claim 7, characterized in that, The process includes magnetic shielding and cooling actions, which are further divided into a self-operation phase and an active intervention phase. Self-operation phase: The shielding positioning plate (105) and the external fixing plate (103) are used to isolate the magnetic field inside and outside the transformer body (1). A certain amount of low temperature water is injected into the cooling water tank (102) to cool the transformer body (1). Cold air is blown into the spiral airflow channel (4) through the air inlet and air outlet. Active intervention phase: In the self-operation phase, the magnetic field strength of the internal environment of the transformer body (1) is obtained in real time. Based on the magnetic field strength, the active winding coil position (104) and the air pump are given action commands. After the active winding coil position (104) is energized and magnetized, it drives the permanent magnet bead (5) to move in a directional spiral. The output power of the air pump is adjusted to change the flow rate of cold air in the spiral airflow channel (4).

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