Current transformer power taking structure and intelligent terminal

Abstract

The application discloses a current transformer power taking structure and an intelligent wiring terminal, relates to the technical field of power systems, and solves the problem that the current transformer power taking scheme is difficult to adapt to the cable terminal wiring terminal, and the technical scheme is as follows: the wiring terminal body is internally recessed and provided with an opening window; a coil is arranged in the opening window; and a magnetic core surrounds the wiring terminal body and passes through the coil to form a closed loop; the recessed opening window and the recessed magnetic core are arranged on the surface of the wiring terminal body, magnetic lines are guided to pass through the coil arranged in the wiring terminal, and the problem that the traditional external coil cannot be installed in the wiring terminal is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a current transformer power supply structure and intelligent terminal block. Background Technology

[0002] Digital sensors in power distribution networks are used to detect the operational status of the network, identify potential safety hazards in advance, and provide data support for the safe operation and protection of the distribution network. Cable terminal blocks are high-risk points for power distribution network faults. Designing a power supply scheme is one of the challenges for the intelligentization of cable terminal blocks. A commonly used power supply scheme is current transformer power supply. However, current transformer power supply is limited to the loop-type power supply method, which requires external coils, resulting in large size and a narrow operating current range. This cannot meet the installation requirements of intelligent cable terminal blocks and the power supply requirements of sensors. Summary of the Invention

[0003] The purpose of this application is to provide a current transformer power extraction structure and intelligent terminal block, which solves the problem that existing current transformer power extraction schemes are difficult to adapt to cable terminal blocks. By setting a concave magnetic core, the problem that the external coil of the traditional current transformer power extraction scheme cannot be installed at the terminal block is effectively solved.

[0004] The above-mentioned technical objective of this application is achieved through the following technical solution: including a terminal body, wherein the surface of the terminal body is provided with an inwardly recessed window; a coil, wherein the coil is placed inside the window; and a magnetic core, wherein the magnetic core surrounds the terminal body and passes through the coil to form a closed loop.

[0005] Using the above technical solution, the magnetic core guides the magnetic lines of force generated by the terminal body through the coil placed inside the terminal to enhance the electromagnetic coupling between the coil and the terminal body. The coil then draws power through induction, effectively solving the problem that traditional external coils cannot be installed in the terminal.

[0006] Furthermore, the surface of the terminal block body is provided with an annular groove, and the magnetic core is placed in the annular groove.

[0007] By adopting the above technical solution, the setting of the annular groove ensures that the outer diameter of the terminal body is not increased after the magnetic core is installed, and the installation is more secure.

[0008] Furthermore, the magnetic core has an arc-shaped first segment, which is placed in the annular groove. One end of the first segment is bent inward along the inner wall of the window to form a second segment. The second segment is bent laterally along the inner wall of the window to form a third segment. The third segment is bent outward along the inner wall of the window to form a fourth segment. The fourth segment passes through the coil out of the window and is connected to the other end of the first segment.

[0009] Using the above technical solution, the magnetic core consists of four sections, which guide the magnetic lines of force generated by the terminal body through the coil placed inside the terminal.

[0010] Furthermore, the cross-section of the window is rectangular, rounded rectangular, or elliptical, and the cross-section of the coil is adapted to the cross-section of the window.

[0011] Furthermore, the magnetic core is made of a material with a relative permeability greater than 4000.

[0012] Furthermore, the surface of the magnetic core is coated with insulating varnish, and the insulating varnish has a withstand voltage greater than 25V.

[0013] Furthermore, the portion of the terminal block that connects to the cable is filled with conductive material.

[0014] The above technical solution can be adapted to small diameter cables.

[0015] In another aspect, the present invention provides an intelligent terminal block, including an antenna, a sensor, a circuit board, and the aforementioned current transformer power supply structure, wherein the antenna, sensor, and current transformer power supply structure are all connected to the circuit board.

[0016] The above technical solution uses a current transformer to draw power, sensors to collect data, integrated components on the circuit board to process the data, and finally transmits it to the back-end terminal via an antenna, facilitating real-time monitoring of the terminal block status.

[0017] Furthermore, the circuit board includes: an AC / DC converter, a protection circuit, a DC / DC converter, a sensor, a conditioning circuit, a microprocessor, and an RF communication circuit. The current transformer's power supply structure is connected in series with a compensation capacitor C. S and parallel compensation capacitor C P It is then connected in sequence to an AD / DC converter, a protection circuit, a DC / DC converter, a microprocessor, and an RF communication circuit; the RF communication circuit is connected to an antenna; the DC / DC converter is connected to a sensor, and the sensor is connected to the microprocessor through a signal conditioning circuit.

[0018] Furthermore, the antenna is positioned at the opening of the window.

[0019] By adopting the above technical solutions, communication quality can be improved.

[0020] Compared with the prior art, this application has the following beneficial effects: This application provides a current transformer power supply structure, which effectively solves the problem that traditional external coils cannot be installed in the terminal by opening a recessed window on the surface of the terminal body and recessing the magnetic core, guiding the magnetic lines of force through the coil placed inside the terminal. Furthermore, based on this current transformer power supply structure, an intelligent terminal is also provided, which is powered by the current transformer power supply structure, collects data through sensors, processes the data through components integrated on the circuit board, and finally transmits the data to the back-end terminal through an antenna, facilitating real-time monitoring of the terminal status. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 This is a schematic diagram of the current transformer power extraction structure provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the AA cross-section of the current transformer power extraction structure provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the connection between the coil and the magnetic core provided in an embodiment of the present invention;

[0025] Figure 4 This is a front view of the coil and magnetic core connection provided in an embodiment of the present invention;

[0026] Figure 5 A schematic BB cross-sectional view of a coil and magnetic core provided in an embodiment of the present invention;

[0027] Figure 6 The circuit diagram of an intelligent terminal block provided in an embodiment of the present invention.

[0028] The attached diagram shows the markings and corresponding component names:

[0029] 1. Terminal block body; 2. Window; 3. Coil; 4. Magnetic core; 5. Circuit board; 6. Antenna. Detailed Implementation

[0030] In the following, the terms “comprising” or “may include” as used in the various embodiments of this application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms “comprising,” “having,” and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or the possibility of adding one or more combinations of the foregoing.

[0031] In various embodiments of this application, the expression "or" or "at least one of A and / or B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A and / or B" may include A, may include B, or may include both A and B.

[0032] The terms used in the various embodiments of this application (such as "first," "second," etc.) may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above terms do not limit the order and / or importance of the elements. The above terms are only used for the purpose of distinguishing one element from other elements. For example, a first user device and a second user device refer to different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0033] It should be noted that if a description refers to "connecting" a component to another component or "connecting" it to another component, then the first component can be directly connected to the second component, and a third component can be "connected" between the first and second components. Conversely, when a component is "directly connected" to another component or "directly connected" to another component, it can be understood that there is no third component between the first and second components.

[0034] The terminology used in the various embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the various embodiments of this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which the various embodiments of this application pertain. The terms (such as those defined in a generally used dictionary) are to be interpreted as having the same meaning as in the context of the relevant technical field and are not to be interpreted as having an idealized or overly formal meaning, unless clearly defined in the various embodiments of this application.

[0035] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this application are only for explaining this application and are not intended to limit this application.

[0036] Please see Figure 1 This is a schematic diagram of the power taking structure of a current transformer. The power taking structure includes: terminal block 1, coil 3 and magnetic core 4; terminal block 1, also known as a wire lug, is a standard copper component used for cable end connection and splicing, making the connection between the cable and the electrical appliance more secure. One end of the terminal block is cylindrical for crimping the cable, and the other end of the terminal block is a flat plate with openings for connecting to the electrical appliance.

[0037] Please see Figure 2 This is a cross-sectional view (AA) of the current transformer's power-off mechanism. The terminal block body 1 has an inwardly recessed window 2 for holding a coil 3 connected end-to-end. A magnetic core 4 is wound around the terminal block surface. The magnetic core 4 extends into the window 2 and passes through the coil 3, exiting the window 2 to form a closed circuit. Figure 3 As shown, during implementation, the magnetic core 4 guides the magnetic lines of force generated by the terminal body 1 through the coil 3 placed inside the terminal to enhance the electromagnetic coupling between the coil 3 and the terminal body 1. The coil 3 draws power through induction, effectively solving the problem that the traditional external coil 3 cannot be installed in the terminal.

[0038] Furthermore, the surface of the terminal block body 1 is provided with an annular groove, which is at the same height as the center of the window 2. The magnetic core 4 is placed in the annular groove, surrounds the terminal block body 1, extends into the window 2, and passes through the coil 3 to exit the window 2, surrounding the terminal block body 1 once. The annular groove ensures that the magnetic core 4 does not increase the outer diameter of the terminal block body after installation, and the installation is more secure.

[0039] In another possible embodiment, the surface of the terminal block body 1 does not need to be provided with an annular groove, and the magnetic core 4 is directly fixed to the surface of the terminal block body 1.

[0040] For further details, please see Figure 4 and 5 As shown, the magnetic core 4 has an arc-shaped first section, which is placed in an annular groove. One end of the first section is bent inward along the inner wall of the window 2 to form a second section. The second section is close to the inner wall of the window 2 and has a gap with the coil 3. The second section is bent laterally along the inner wall of the window 2 to form a third section. The third section is close to the inner wall of the window 2 and has a gap with the coil 3. The third section is bent outward along the inner wall of the window 2 to form a fourth section. The fourth section passes through the coil 3 and exits the window 2, with a gap between it and the coil 3. After exiting the window 2, the fourth section connects to the other end of the first section to form a closed loop. The magnetic core 4 is composed of four sections, which guide the magnetic lines of force generated by the terminal body 1 through the coil 3 placed inside the terminal.

[0041] It should be noted that dividing the magnetic core 4 into four segments is only one possible specific preference. This embodiment does not limit the specific shape of the magnetic core 4. Any magnetic core 4 structure that guides the magnetic lines of force through the coil 3 and can be obtained by those skilled in the art without creative effort is included within the protection scope of this application.

[0042] Furthermore, the cross-section of the window 2 is rectangular, and the cross-section of the coil 3 is also rectangular. Setting the window 2 as rectangular makes it easier to directly process the existing terminal body 1 with high processing accuracy. The coil 3 is adapted to the shape of the window 2 and is also set as rectangular, making it easy to place inside the window 2.

[0043] In another possible embodiment, the cross-section of the window 2 can be circular, rounded rectangle, ellipse or other shapes, and the coil 3 is adapted to the window 2. It should be noted that setting the cross-section of the window 2 and the coil 3 to be rectangular is only a specific preferred possibility. This embodiment does not limit the cross-sectional shape of the window 2 and the coil 3.

[0044] Furthermore, the area where the terminal block body connects to the cable is filled with conductive material, such as aluminum or copper strips. Due to the size limitations of the coil and magnetic core, the terminal block body needs to have a certain amount of space to accommodate openings. For example, if the power take-off structure of this current transformer is adapted to a 500 sq mm terminal block body, then to accommodate small-diameter cables, such as 50 sq mm cables, conductive material can be filled into the space where the 500 sq mm terminal block body and the 50 sq mm cable are inserted during cable crimping to achieve the purpose of compression.

[0045] Furthermore, the magnetic core 4 is made of a material with a relative permeability greater than 4000, and the surface of the magnetic core 4 is coated with insulating varnish. The insulating varnish has a withstand voltage greater than 25V, and the coil is wound with enameled wire and has surface insulation.

[0046] Based on the aforementioned current transformer power extraction structure, an intelligent terminal block is provided. Please refer to [link / reference]. Figure 2 As shown, the intelligent terminal block includes: an antenna 6, a sensor, a circuit board 5, and the aforementioned current transformer power supply structure. The antenna 6, sensor, and current transformer power supply structure are all connected to the circuit board 5. The circuit board 5 is powered by the current transformer power supply structure, and the sensor is also powered by the circuit board 5. In implementation, power is supplied through the current transformer power supply structure, data is collected by the sensor, the data is processed by components integrated on the circuit board 5, and finally transmitted to the backend terminal via the antenna 6, facilitating real-time monitoring of the terminal block's status.

[0047] Furthermore, antenna 6 is placed at the opening of window 2 to improve communication quality.

[0048] Circuit board 5 includes an AC / DC converter, a protection circuit, a DC / DC converter, sensors, a conditioning circuit, a microprocessor, and an RF communication circuit. The AC / DC converter converts the AC power generated by the current transformer's power supply structure into DC power. The protection circuit prevents overvoltage at the AC / DC converter output. The DC / DC converter converts the input DC power into the power required by the subsequent system. Sensors are used to collect necessary data, including but not limited to temperature sensors, partial discharge sensors, video sensors, noise sensors, light sensors, voltage and current sensors, etc. The conditioning circuit converts the sensor output signals into electrical signals that can be processed by the microprocessor; the conversion process includes, but is not limited to, filtering, amplitude conversion, phase shifting, biasing, mixing, and quadrature conversion. The microprocessor processes sensor data, including but not limited to data preprocessing, feature extraction, data recognition, and data compression. The RF communication circuit is used for radio communication.

[0049] Specifically, the current transformer power supply structure is connected to circuit board 5, and a compensation capacitor C is connected in series. S Parallel compensation capacitor C P Then, it is connected in sequence to the AD / DC converter, protection circuit, DC / DC converter, microprocessor and RF communication circuit; the RF communication circuit is connected to antenna 6; the DC / DC converter is connected to the sensor, and the sensor is connected to the microprocessor through the signal conditioning circuit.

[0050] Furthermore, such as Figure 6 The diagram shown is a circuit schematic of an intelligent terminal block, where the current transformer power supply structure is equivalent to... Figure 6 The equivalent inductance model in L PFor the lumped parameter equivalent inductance model of terminal block 1, L S For the lumped parameter equivalent inductance model of coil 3, M PS For L P and L S Mutual intuition between them; C S For series compensation capacitors; C P For parallel compensation capacitors; C D For DC filter capacitors, D Z A Zener diode is used to form a protection circuit; V R For AC / DC converter; V B 6 is a DC / DC converter; MCU is a microprocessor; ADJ is a signal conditioning circuit; SOR is a sensor; ANT is an antenna.

[0051] according to Figure 6 It can be seen that when the equivalent impedance of the sensor is infinitely large, the output voltage U of the AD / DC converter is... DC It can be represented as:

[0052]

[0053] And it needs to meet the following requirements:

[0054]

[0055] Among them, I P It is the L that has flowed through P The current, j is the unit imaginary number, and ω is the system's operating angular frequency. For a 50Hz system, ω = 2 * 3.14 * 50.

[0056] According to U DC Expressions can be adjusted by C. S and C P Size adjustment U DC That is, by adjusting C S and C P The size of the AD / DC converter output voltage U is controlled by the size of the converter. DC This can effectively simplify the design of coil 3 and improve the system's I... P Size tolerance.

[0057] This embodiment provides a current transformer power supply structure. By creating a recessed window 2 on the surface of the terminal block body 1, the magnetic core 4 is recessed, and the magnetic lines of force are guided through the coil 3 placed inside the terminal block. This effectively solves the problem that the traditional external coil 3 cannot be installed in the terminal block. Furthermore, based on this current transformer power supply structure, an intelligent terminal block is also provided. It is powered by the current transformer power supply structure, collects data through sensors, processes the data through components integrated on the circuit board 5, and finally transmits the data to the back-end terminal through the antenna 6, which facilitates real-time monitoring of the terminal block status.

[0058] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A current transformer power extraction structure, characterized in that: include The terminal block body has an inwardly recessed window on its surface; A coil, the coil being placed within the opening; A magnetic core surrounds the terminal body and passes through the coil to form a closed loop; The surface of the terminal block body is provided with an annular groove, and the magnetic core is placed in the annular groove. The magnetic core has an arc-shaped first section, which is placed in an annular groove. One end of the first section is bent inward along the inner wall of the window to form a second section. The second section is bent laterally along the inner wall of the window to form a third section. The third section is bent outward along the inner wall of the window to form a fourth section. The fourth section passes through the coil and exits the window, and is connected to the other end of the first section.

2. The current transformer power extraction structure according to claim 1, characterized in that: The window cross-section is rectangular, rounded rectangle, or elliptical, and the coil cross-section is adapted to the window cross-section.

3. The current transformer power extraction structure according to claim 2, characterized in that: The magnetic core is made of a material with a relative permeability greater than 4000.

4. The current transformer power extraction structure according to claim 3, characterized in that: The surface of the magnetic core is coated with insulating varnish, and the insulating varnish has a withstand voltage greater than 25V.

5. The current transformer power extraction structure according to claim 4, characterized in that: The portion of the terminal block that connects to the cable is filled with conductive material.

6. An intelligent terminal block, characterized in that: It includes an antenna, a sensor, a circuit board, and a current transformer power supply structure as described in any one of claims 1-5, wherein the antenna, sensor, and current transformer power supply structure are all connected to the circuit board.

7. The intelligent terminal block according to claim 6, characterized in that: The circuit board comprises an AC / DC converter, a protection circuit, a DC / DC converter, a sensor, a conditioning circuit, a microprocessor and a radio frequency communication circuit, the current transformer power supply structure is connected with the AC / DC converter, the protection circuit, the DC / DC converter, the microprocessor and the radio frequency communication circuit in sequence through a series compensation capacitor C S and a parallel compensation capacitor C P The radio frequency communication circuit is connected with an antenna; the DC / DC converter is connected with the sensor, and the sensor is connected with the microprocessor through the conditioning circuit.

8. The intelligent terminal block according to claim 7, characterized in that: The antenna is positioned at the opening of the window.

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