A power taking method and system of a hollow conductor tube current sensor

Abstract

This invention pertains to the field of power and discloses a power extraction method and system for a current sensor inside a hollow conductor tube. The method includes: injecting a constant alternating current into one side of the hollow conductor tube; collecting magnetic field strength at different axial positions along the central axis of the hollow conductor tube using a magnetic sensor to determine the axial distribution characteristics of the magnetic field inside the tube when current is applied; based on the distribution characteristics, arranging a current inductor power supply device in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, the preset threshold satisfying the minimum starting magnetic field requirement of the current inductor power supply device; generating induced alternating current by coupling the alternating magnetic field inside the tube through a magnetic field collecting coil, converting it to direct current through a rectifier circuit, filtering out AC ripple through a filter device, and obtaining a stable direct current to power the current sensor inside the hollow conductor tube.

Description

Technical Field

[0001] This invention belongs to the field of electric power, and in particular relates to a method and system for obtaining power from a current sensor inside a hollow conductor tube. Background Technology

[0002] Hollow conductor tube current measurement technology, as a novel measurement technology that integrates the high-current-weak magnetic field conversion mechanism of conductor tubes with a high-precision weak magnetic field sensing scheme, has gradually become the mainstream monitoring solution in scenarios such as power transmission and distribution lines and high-current equipment in metallurgy and chemical industries due to its advantages of good insulation performance, high measurement linearity, and strong anti-interference ability. The working principle of this technology is as follows: when a hollow conductor tube is connected in series to a high-current circuit, the magnetic field strength generated inside the tube is much lower than that outside the tube. By arranging high-precision weak magnetic field sensors such as fluxgate magnetometers inside the tube, non-contact high-current metering can be achieved without direct contact with the high-voltage conductor, fundamentally reducing the difficulty of insulation design.

[0003] However, to truly implement this technology in long-term continuous monitoring scenarios, the primary challenge is solving the problem of online power supply for the current sensor inside the tube. Currently, commonly used online power extraction solutions in power systems all suffer from varying degrees of compatibility issues: battery or solar + energy storage combinations not only require significant installation space but also have output power highly susceptible to ambient light and temperature fluctuations, making them completely unsuitable for the confined installation environment inside hollow conductor tubes; low-voltage side capacitor voltage divider power extraction relies on high-voltage capacitors, resulting in bulky components and potential safety hazards from high-voltage breakdown; while laser power supply solutions can achieve electrical isolation, their output power is limited to milliwatt levels due to photoelectric conversion efficiency. Meeting the long-term operational requirements of the sensor necessitates the use of a high-power laser, making the solution extremely expensive and requiring light-transmitting holes in the hollow conductor tube wall, further increasing the difficulty of airtightness and protection design; traditional current transformer power extraction solutions require wrapping around the transmission line, preventing the power supply line from safely entering the high-voltage side from the outside of the tube, posing a risk of breakdown due to potential difference power supply, making them completely unsuitable for the power supply needs of sensors inside the tube. Summary of the Invention

[0004] In view of this, the present invention discloses a power extraction method and system for a current sensor inside a hollow conductor tube, which can solve the shortcomings of related technologies.

[0005] To achieve the above objectives, the present invention discloses the following technical solution: According to a first aspect of the present invention, a power extraction method for a current sensor inside a hollow conductor tube is provided. The method is applied to a power extraction system for a current sensor inside a hollow conductor tube equipped with a current inductance power supply device. The current inductance power supply device includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, and the frame is adapted to be installed inside the hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and the output terminal is connected to the current sensor inside the hollow conductor tube via the filter device. The method includes: A constant alternating current is injected into one side of a hollow conductor tube, and the magnetic field strength at different axial positions is collected point by point along the central axis of the hollow conductor tube by a magnetic sensor to determine the axial distribution characteristics of the magnetic field inside the tube when current is passed through it. Based on the distribution characteristics, the current inductor power supply device is arranged in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, and the preset threshold meets the minimum starting magnetic field requirement of the current inductor power supply device. The alternating magnetic field inside the coil coupling tube generates induced alternating current, which is then converted into direct current by a rectifier circuit. After the alternating current ripple is filtered out by a filter device, a stable direct current is obtained to power the current sensor inside the hollow conductor tube.

[0006] According to a second aspect of the present invention, a power supply device for a current sensor inside a hollow conductor tube is provided. The system is equipped with a current inductance power supply device, which includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, and the frame is adapted to be installed inside the hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and the output terminal is connected to the current sensor inside the hollow conductor tube via the filter device. The device includes: Acquisition Unit: A constant alternating current is injected into one side of the hollow conductor tube, and the magnetic field strength at different axial positions is collected point by point along the central axis of the hollow conductor tube by a magnetic sensor to determine the axial distribution characteristics of the magnetic field inside the tube when current is passed through it. Arrangement Unit: According to the distribution characteristics, the current inductor power supply device is arranged in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, and the preset threshold meets the minimum starting magnetic field requirement of the current inductor power supply device. Coupling unit: The alternating magnetic field inside the coupling tube of the magnetic field collection coil generates induced alternating current, which is converted into direct current by the rectifier circuit, and then the AC ripple is filtered out by the filter device to obtain a stable direct current for powering the current sensor inside the hollow conductor tube.

[0007] According to a third aspect of the present invention, an electronic device is provided, comprising: processor; Memory used to store processor-executable instructions; The processor implements the steps of the method as described in the first aspect by running the executable instructions.

[0008] According to a fourth aspect of the invention, a computer-readable storage medium is provided having computer instructions stored thereon that, when executed by a processor, implement the steps of the method as described in the first aspect.

[0009] As can be seen from the above technical solutions, the power extraction method and system for the hollow conductor tube current sensor disclosed in this invention have the following beneficial effects: On the one hand, the overall structure of this invention is miniaturized, directly installed inside the hollow conductor tube, making installation convenient and compact, and eliminating the need for additional processing of the conductor tube, thereby reducing costs. On the other hand, by installing the current transformer power supply device inside the hollow conductor tube, and utilizing the characteristic that the inside of the conductor tube is in an equipotential space when energized, the power supply device, power supply line, and magnetic sensor for current measurement are all located in an equipotential environment, avoiding the risk of circuit breakdown caused by high potential differences. This solves the high-voltage safety problem of existing current transformer power supply technology when power needs to be supplied from the low-voltage end outside the transmission line to the high-voltage end inside the hollow conductor tube. Attached Figure Description

[0010] Figure 1 This is an exemplary embodiment of a power supply system for a current sensor inside a hollow conductor tube. Figure 2 This is a flowchart illustrating a power extraction method for a current sensor inside a hollow conductor tube, as provided in an exemplary embodiment. Figure 3 This is a schematic diagram of a magnetic field distribution provided in an exemplary embodiment; Figure 4 This is a schematic diagram illustrating the basic principle of a power supply device circuit as provided in an exemplary embodiment; Figure 5 This is a schematic structural diagram of a device provided in an exemplary embodiment; Figure 6 This is a block diagram of a power supply system for a current sensor inside a hollow conductor tube, provided as an exemplary embodiment. Detailed Implementation

[0011] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of the present invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of one or more embodiments of the present invention as detailed in the appended claims.

[0012] It should be noted that the steps of the corresponding methods in other embodiments are not necessarily performed in the order shown and described in this invention. In some other embodiments, the methods may include more or fewer steps than those described in this invention. Furthermore, a single step described in this invention may be broken down into multiple steps in other embodiments; and multiple steps described in this invention may be combined into a single step in other embodiments.

[0013] Hollow conductor tube current measurement technology, as a novel measurement technology that integrates the high-current-weak magnetic field conversion mechanism of conductor tubes with a high-precision weak magnetic field sensing scheme, has gradually become the mainstream monitoring solution in scenarios such as power transmission and distribution lines and high-current equipment in metallurgy and chemical industries due to its advantages of good insulation performance, high measurement linearity, and strong anti-interference ability. The working principle of this technology is as follows: when a hollow conductor tube is connected in series to a high-current circuit, the magnetic field strength generated inside the tube is much lower than that outside the tube. By arranging high-precision weak magnetic field sensors such as fluxgate magnetometers inside the tube, non-contact high-current metering can be achieved without direct contact with the high-voltage conductor, fundamentally reducing the difficulty of insulation design.

[0014] However, to truly implement this technology in long-term continuous monitoring scenarios, the primary challenge is solving the problem of online power supply for the current sensor inside the tube. Currently, commonly used online power extraction solutions in power systems all suffer from varying degrees of compatibility issues: battery or solar + energy storage combinations not only require significant installation space but also have output power highly susceptible to ambient light and temperature fluctuations, making them completely unsuitable for the confined installation environment inside hollow conductor tubes; low-voltage side capacitor voltage divider power extraction relies on high-voltage capacitors, resulting in bulky components and potential safety hazards from high-voltage breakdown; while laser power supply solutions can achieve electrical isolation, their output power is limited to milliwatt levels due to photoelectric conversion efficiency. Meeting the long-term operational requirements of the sensor necessitates the use of a high-power laser, making the solution extremely expensive and requiring light-transmitting holes in the hollow conductor tube wall, further increasing the difficulty of airtightness and protection design; traditional current transformer power extraction solutions require wrapping around the transmission line, preventing the power supply line from safely entering the high-voltage side from the outside of the tube, posing a risk of breakdown due to potential difference power supply, making them completely unsuitable for the power supply needs of sensors inside the tube.

[0015] To address the shortcomings of related technologies, this invention proposes a power extraction method and system for a current sensor inside a hollow conductor tube.

[0016] Figure 1 This is an exemplary embodiment of a power supply system for a current sensor inside a hollow conductor tube. The system includes a hollow conductor tube 11, a current transformer power supply device 12, a current sensor 13, and a power transmission cable 14.

[0017] The hollow conductor tube 11 can be made of aluminum with a length of 1.5m, an inner diameter of 56mm, and an outer diameter of 60mm. The current sensor 13 can be a DRV425 high-precision fluxgate magnetometer chip for weak magnetic detection. The current inductance power supply device 12 is installed at a specific location based on the magnetic field distribution characteristics inside the hollow conductor tube 11.

[0018] The current inductance power supply device 12 includes a magnetic field collecting coil 121, a frame 122, a rectifier circuit 123, and a filter element 124. The magnetic field collecting coil 121 is wound on the frame 122, which is adapted to be installed inside the hollow conductor tube 11. The input terminal of the rectifier circuit 123 is connected to the magnetic field collecting coil 121, and the output terminal is connected to the current sensor 13 inside the hollow conductor tube 11 via the filter element 124.

[0019] The frame 122 of the current transformer power supply device can be made of insulating material, such as PVC. It has a radius of 25mm and a length of 48mm, with I-shaped structures at both ends. It is fixed inside the hollow conductor tube by interference fit or snap-fit. After installation, the axis of the frame coincides with the axis of the hollow conductor tube, and the overall radial dimension of the current transformer power supply device is smaller than the inner diameter of the hollow conductor tube. The insulating frame blocks the conductive path between the power supply device and the hollow conductor tube, preventing the formation of short-circuit loops. The I-shaped structure and interference fit design ensure that the device does not shift under vibration conditions inside the tube, and also achieve rapid installation without additional supports. Furthermore, the overall radial dimension is smaller than the inner diameter of the tube, making it perfectly suitable for deployment in confined spaces.

[0020] A ferrite core is coaxially embedded inside the frame 122. The length of the ferrite core is the same as the length of the frame, and its diameter is one-third to one-half of the frame diameter. This is used to improve the magnetic coupling efficiency of the magnetic field collecting coil. For example, a ferrite core with a diameter of 10mm and a length of 48mm is embedded inside the frame, and 5500 turns of 0.2mm diameter enameled wire are wound on the outer layer as the magnetic field collecting coil. The high permeability of the ferrite core improves the magnetic coupling efficiency of the magnetic field collecting coil. Under the same current conditions, it can increase the induced electromotive force by more than 30%, reducing the requirement for the lower limit of the tube current of the power supply device and broadening the applicable operating conditions.

[0021] The rectifier circuit 123 can be a full-bridge rectifier circuit composed of four Schottky diodes, used to rectify the AC power output from the magnetic field collecting coil into pulsating DC power. Compared with half-wave rectification, the full-bridge rectifier circuit using Schottky diodes improves the output power, and the forward voltage drop and switching loss of Schottky diodes further improve the power conversion efficiency and reduce heat loss.

[0022] The filter element 124 can be an electrolytic capacitor connected in parallel to the output of the rectifier circuit to filter out residual AC components after rectification and reduce the output voltage ripple coefficient. Electrolytic capacitor filtering can reduce the output voltage ripple coefficient to below 5%, providing a clean DC power supply for the weak magnetic field sensor, avoiding measurement data jumps or sensor false triggering caused by power fluctuations, and ensuring the accuracy and stability of current measurement.

[0023] The magnetic field collecting coil 121 can be wound with 0.2mm diameter enameled wire, with 5000~6000 turns. The coil inductance is matched to the excitation frequency of the 50Hz power frequency magnetic field inside the hollow conductor tube. The matching design of approximately 5500 coil turns and 0.2mm wire diameter ensures that the coil inductance is compatible with the 50Hz power frequency magnetic field while controlling the coil's internal resistance and size. Actual measurements show that it can output a stable voltage of 2.2V~2.5V under 500A~700A conditions, perfectly matching the operating voltage range of mainstream weak magnetic field sensors.

[0024] Figure 2 This is a flowchart illustrating a power extraction method for a current sensor inside a hollow conductor tube, as provided in an exemplary embodiment. Figure 2 As shown, this method is applied to a power supply system for a current sensor inside a hollow conductor tube equipped with a current inductance power supply device. The current inductance power supply device includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, and the frame is adapted to be installed inside the hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and the output terminal is connected to the current sensor inside the hollow conductor tube via the filter device. The method may include the following steps: Step 201: Inject a constant alternating current into one side of the hollow conductor tube, and use a magnetic sensor to collect the magnetic field strength at different axial positions along the central axis of the hollow conductor tube to determine the axial distribution characteristics of the magnetic field inside the tube when current is passed through it.

[0025] A constant AC current of 50Hz and 10A was injected into one side of the hollow conductor tube using an MGY1000A standard AC power supply. A set of magnetic field data was collected every 5cm along the central axis of the tube using a DRV425 fluxgate magnetometer probe. The magnetic field distribution characteristics inside the tube were obtained: the magnetic field strength in the central region of the tube (axial 50cm~110cm) was ≤2000nT, while the magnetic field strength in the end region near the current injection side (axial 0~40cm) increased exponentially, reaching a maximum of over 14000nT, showing a clear distribution pattern of "strong at both ends and weak in the center".

[0026] Step 202: Based on the distribution characteristics, the current inductor power supply device is arranged in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, and the preset threshold meets the minimum starting magnetic field requirement of the current inductor power supply device.

[0027] A hollow aluminum tube (1.5m in length, 56mm in inner diameter, and 60mm in outer diameter) is used as the conductor for the hollow conductor tube current measuring device. A constant AC current of 50Hz (set to 10A) is injected into one end of the tube using an MGY1000A standard AC power supply, generating a corresponding magnetic field within the tube. The magnetic field strength generated by the current at different axial positions along the tube's central axis is then measured using a DRV425 high-precision fluxgate magnetometer probe (data is measured every 5cm along the axial direction). The magnetic field distribution characteristics within the tube are then plotted on a rectangular coordinate system with magnetic field strength on the vertical axis and axial distance on the horizontal axis. Figure 3 As shown, the magnetic field distribution inside the pipe is characterized by a weak magnetic field in the central region (the area shown on the horizontal axis as 50cm-110cm), while the magnetic field strength increases exponentially at both ends of the pipe (0-40cm and 120-140cm), especially near the side where the current is injected, where the magnetic field reaches over 14000nT, which is sufficient to meet the magnetic field strength required by the current transformer power supply device. Therefore, it is determined that the magnetic field collecting coil of the power supply device will be placed at both ends of the pipe (in this scheme, it is placed at 10cm).

[0028] The basic circuit diagram of the power supply device is as follows: Figure 4 As shown (R1 in the diagram represents the current-carrying load), four diodes (model 1N5819G) form a bridge structure. Its working principle is as follows: when the positive half-cycle of the AC current arrives, diodes D5 and D8 conduct, forming a current loop, and the load receives a positive voltage. During the negative half-cycle, diodes D7 and D6 conduct, again forming a current loop, and the load also receives a positive voltage. In this way, regardless of the polarity of the AC current, the load always receives a voltage in the same direction, thus achieving full-wave rectification. The capacitor C1 serves as a filter, reducing fluctuations in the output signal.

[0029] Step 203: The alternating magnetic field inside the magnetic field collection coil coupling tube generates induced alternating current, which is then converted into direct current by a rectifier circuit. After the alternating current ripple is filtered out by a filter device, a stable direct current is obtained to power the current sensor inside the hollow conductor tube.

[0030] The current injected into the conductor tube is 50Hz AC, so the magnetic field inside the tube is an alternating magnetic field, which drives the induced current in the collecting coil to be AC. Since the magnetic probe is basically powered by DC, the output of the collecting coil needs to be rectified by a full-bridge rectifier circuit to convert the power supply current from AC to DC. Then, a capacitor is used to filter out the remaining AC component before finally connecting it to the current measuring device to power it.

[0031] In this embodiment, on the one hand, the overall structure of the present invention is a miniaturized design, directly installed inside the hollow conductor tube, which is convenient to install, small in size, and requires no additional processing of the conductor tube, thereby reducing costs. On the other hand, by installing the current transformer power supply device inside the hollow conductor tube, and utilizing the characteristic that the inside of the conductor tube is in an equipotential space when energized, the power supply device, power supply line, and magnetic sensor for current measurement are all located in an equipotential environment, avoiding the risk of circuit breakdown caused by high potential differences. This solves the high-voltage safety problem of existing current transformer power supply technology when power needs to be supplied from the low-voltage end outside the transmission line to the high-voltage end inside the hollow conductor tube.

[0032] The current transformer power supply device and the current sensor are both located within an equipotential space inside a hollow conductor tube. The power supply lines between them lack high-voltage insulation and isolation structures, and no perforations are made in the tube wall for the power supply lines. This shared equipotential space eliminates the need for additional components such as high-voltage isolation transformers and insulating bushings, further reducing the device's size and eliminating safety hazards caused by insulation aging and insufficient creepage distance, thus improving system reliability.

[0033] Figure 5 This is a schematic structural diagram of a device provided in an exemplary embodiment. Please refer to... Figure 5 At the hardware level, the device includes a processor 502, an internal bus 504, a network interface 506, memory 508, and non-volatile memory 510, and may also include other hardware required for its functions. One or more embodiments of the present invention can be implemented in software, for example, the processor 502 reads the corresponding computer program from the non-volatile memory 510 into memory 508 and then runs it. Of course, in addition to software implementation, one or more embodiments of the present invention do not exclude other implementation methods, such as logic devices or a combination of hardware and software, etc. That is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or logic devices.

[0034] Please refer to Figure 6 A power supply system for a current sensor inside a hollow conductor tube can be applied to applications such as... Figure 6 In the device shown, to implement the technical solution of the present invention, the system is equipped with a current transformer power supply device, which includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, and the frame is adapted to be installed inside a hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and the output terminal is connected to a current sensor inside the hollow conductor tube via the filter device; including: The acquisition unit 601 is used to inject constant alternating current into one side of the hollow conductor tube and collect the magnetic field intensity at different axial positions along the central axis of the hollow conductor tube by means of a magnetic sensor, so as to determine the axial distribution characteristics of the magnetic field inside the hollow conductor tube when current is passed through it. Arrangement unit 602 is used to arrange the current transformer power supply device in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, according to the distribution characteristics. The preset threshold satisfies the minimum starting magnetic field requirement of the current transformer power supply device. The coupling unit 603 is used to generate induced alternating current through the alternating magnetic field inside the coil coupling tube by the magnetic field collection coil. After being converted into direct current by the rectifier circuit, the AC ripple is filtered out by the filter device to obtain a stable direct current for powering the current sensor inside the hollow conductor tube.

[0035] Optionally, the frame is made of insulating material, with both ends set as I-shaped structures, and is fixed inside the hollow conductor tube by interference fit or snap-fit. After installation, the axis of the frame coincides with the axis of the hollow conductor tube, and the overall radial dimension of the current inductance power supply device is smaller than the inner diameter of the hollow conductor tube.

[0036] Optionally, a ferrite core is coaxially embedded inside the skeleton. The length of the ferrite core is the same as the length of the skeleton, and the diameter is one-third to one-half of the diameter of the skeleton, which is used to improve the magnetic coupling efficiency of the magnetic field collecting coil.

[0037] Optionally, the rectifier circuit is a full-bridge rectifier circuit composed of four Schottky diodes, used to rectify the AC power output from the magnetic field collecting coil into pulsating DC power.

[0038] Optionally, the filtering device is an electrolytic capacitor connected in parallel to the output terminal of the rectifier circuit to filter out the residual AC component after rectification and reduce the output voltage ripple coefficient.

[0039] Optionally, the magnetic field collecting coil is wound with enameled wire of 0.2mm diameter, with 5000~6000 turns, and the coil inductance is matched with the excitation frequency of the 50Hz power frequency magnetic field inside the hollow conductor tube.

[0040] Optionally, the current transformer power supply device and the current sensor are both located in the equipotential space inside the hollow conductor tube, and the power supply line between the two is not provided with a high-voltage insulation isolation structure, and no power supply line perforation is opened in the wall of the hollow conductor tube.

[0041] The systems, devices, modules, or units described in the above embodiments can be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer, which can take the form of a personal computer, laptop computer, cellular phone, camera phone, smartphone, personal digital assistant, media player, navigation device, email sending and receiving device, game console, tablet computer, wearable device, or any combination of these devices.

[0042] In a typical configuration, a computer includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0043] Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0044] Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, disk storage, quantum memory, graphene-based storage media or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0045] For any other form of computer-readable medium (or computer-readable storage medium) as described above, computer instructions may be stored thereon, which, when executed by a processor, implement one or more of the above embodiments, thereby realizing the technical solution of the present invention.

[0046] The present invention also proposes a computer program that, when executed by a processor, implements one or more of the embodiments described above, thereby realizing the technical solution of the present invention. This computer program may be specifically recorded on the above-described or other computer-readable media, and the present invention does not impose any limitations on this.

[0047] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0048] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are possible or may be advantageous.

[0049] The terminology used in one or more embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in one or more embodiments of the invention and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0050] It should be understood that although the terms first, second, third, etc., may be used to describe various information in one or more embodiments of the present invention, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of one or more embodiments of the present invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0051] The above description is merely a preferred embodiment of one or more embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of the present invention should be included within the protection scope of one or more embodiments of the present invention.

Claims

1. A method for drawing power from a current sensor inside a hollow conductor tube, characterized in that, The method is applied to a power supply system for a current sensor inside a hollow conductor tube equipped with a current inductance power supply device. The current inductance power supply device includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, which is fitted and installed inside the hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and its output terminal is connected to the current sensor inside the hollow conductor tube via the filter device. The method includes: A constant alternating current is injected into one side of a hollow conductor tube, and the magnetic field strength at different axial positions is collected point by point along the central axis of the hollow conductor tube by a magnetic sensor to determine the axial distribution characteristics of the magnetic field inside the tube when current is passed through it. Based on the distribution characteristics, the current inductor power supply device is arranged in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, and the preset threshold meets the minimum starting magnetic field requirement of the current inductor power supply device. The alternating magnetic field inside the coil coupling tube generates induced alternating current, which is then converted into direct current by a rectifier circuit. After the alternating current ripple is filtered out by a filter device, a stable direct current is obtained to power the current sensor inside the hollow conductor tube.

2. The method according to claim 1, characterized in that, The frame is made of insulating material, with I-shaped structures at both ends. It is fixed inside the hollow conductor tube by interference fit or snap-fit. After installation, the axis of the frame coincides with the axis of the hollow conductor tube, and the overall radial dimension of the current inductance power supply device is smaller than the inner diameter of the hollow conductor tube.

3. The method according to claim 1, characterized in that, A ferrite core is coaxially embedded inside the skeleton. The length of the ferrite core is the same as the length of the skeleton, and the diameter is one-third to one-half of the diameter of the skeleton. This is used to improve the magnetic coupling efficiency of the magnetic field collecting coil.

4. The method according to claim 1, characterized in that, The rectifier circuit is a full-bridge rectifier circuit composed of four Schottky diodes, used to rectify the AC power output from the magnetic field collecting coil into pulsating DC power.

5. The method according to claim 1, characterized in that, The filtering device is an electrolytic capacitor connected in parallel to the output of the rectifier circuit to filter out the residual AC components after rectification and reduce the output voltage ripple coefficient.

6. The method according to claim 1, characterized in that, The magnetic field collecting coil is wound with 0.2mm diameter enameled wire, with 5000~6000 turns. The coil inductance is matched with the excitation frequency of the 50Hz power frequency magnetic field inside the hollow conductor tube.

7. The method according to claim 1, characterized in that, The current transformer power supply device and the current sensor are both located in the equipotential space inside the hollow conductor tube. The power supply line between the two is not equipped with a high-voltage insulation isolation structure, and no power supply line perforation is opened in the wall of the hollow conductor tube.

8. A power supply system for a current sensor inside a hollow conductor tube, characterized in that, The system is equipped with a current transformer power supply device, which includes a magnetic field collecting coil, a frame, a rectifier circuit, and a filter device. The magnetic field collecting coil is wound on the frame, and the frame is fitted and installed inside a hollow conductor tube. The input terminal of the rectifier circuit is connected to the magnetic field collecting coil, and the output terminal is connected to a current sensor inside the hollow conductor tube via the filter device. The system includes: Acquisition Unit: A constant alternating current is injected into one side of the hollow conductor tube, and the magnetic field strength at different axial positions is collected point by point along the central axis of the hollow conductor tube by a magnetic sensor to determine the axial distribution characteristics of the magnetic field inside the tube when current is passed through it. Arrangement Unit: According to the distribution characteristics, the current inductor power supply device is arranged in the end region of the hollow conductor tube where the magnetic field strength is not lower than a preset threshold, and the preset threshold meets the minimum starting magnetic field requirement of the current inductor power supply device. Coupling unit: The alternating magnetic field inside the coupling tube of the magnetic field collection coil generates induced alternating current, which is converted into direct current by the rectifier circuit, and then the AC ripple is filtered out by the filter device to obtain a stable direct current for powering the current sensor inside the hollow conductor tube.

9. An electronic device, characterized in that, include: processor; Memory used to store processor-executable instructions; The processor implements the steps of the method as described in any one of claims 1-7 by running the executable instructions.

10. A computer-readable storage medium storing computer instructions thereon, characterized in that, When executed by the processor, this instruction implements the steps of the method as described in any one of claims 1-7.

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