Current and voltage detection device of high-voltage coaxial line

Abstract

The invention discloses a current and voltage detection device for a high-voltage coaxial line, and the device comprises a sensor which comprises a detection probe and a PCB. The detection probe comprises an inductor and a voltage induction sheet; one end of the inductor is mounted on one surface of the PCB; one end of the voltage induction sheet is attached to one end, far away from the PCB, of the inductor, and the other end of the voltage induction sheet is bent to be attached to one side of the inductor and is electrically connected with the PCB; the PCB is provided with a signal processing module, and the signal processing module comprises a current processing unit electrically connected with the inductor and a voltage processing unit electrically connected with the voltage induction sheet; the current processing unit is used for processing the current of the to-be-detected cable acquired by the inductor, and the voltage processing unit is used for processing the voltage of the to-be-detected cable acquired by the voltage induction sheet. The sensor can measure the current and the voltage of the cable to be measured at the same time.

Description

Technical Field

[0001] This application relates to the field of high-voltage coaxial cable detection, and in particular to a current and voltage detection device for high-voltage coaxial cables. Background Technology

[0002] Currently, VI sensors (current and voltage sensors) used in 400kHz applications are generally contact-based, posing significant safety risks. Furthermore, traditional high-voltage transformers are costly and bulky, typically measuring only voltage or current. Simultaneously measuring both current and voltage on a high-voltage coaxial line requires separate voltage and current sensors, which is complex. Non-contact capacitive voltage dividers are susceptible to interference and cannot measure current, while Rogowski coils can only measure current, not voltage, and are sensitive to installation location, presenting certain limitations. Summary of the Invention

[0003] The purpose of this application is to provide a current and voltage detection device for a high-voltage coaxial cable, which can simultaneously measure the current and voltage of the high-voltage coaxial cable.

[0004] To achieve the above objectives, this application provides a current and voltage detection device for a high-voltage coaxial cable, characterized in that it includes a sensor, the sensor comprising a detection probe and a PCB board; the detection probe includes an inductor and a voltage sensing element, one end of the inductor being mounted on one side of the PCB board; one end of the voltage sensing element is attached to the end of the inductor away from the PCB board, and the other end of the voltage sensing element is bent and attached to one side of the inductor and electrically connected to the PCB board; a signal processing module is provided on the PCB board, the signal processing module including a current processing unit electrically connected to the inductor and a voltage processing unit electrically connected to the voltage sensing element; the current processing unit is used to process the current of the cable under test obtained by the inductor, and the voltage processing unit is used to process the voltage of the cable under test obtained by the voltage sensing element.

[0005] Optionally, the voltage processing unit includes a noise reducer, a first rectifier, and a first filter connected in sequence, the noise reducer being electrically connected to the voltage sensing element; the current processing unit includes a voltage converter, a second rectifier, and a second filter connected in sequence, the voltage converter being electrically connected to the inductor, the voltage converter being used to convert the current signal acquired by the inductor into a voltage signal.

[0006] Optionally, the noise reduction device includes a first capacitor and a second capacitor, with a first terminal of the first capacitor and a first terminal of the second capacitor electrically connected to the voltage sensing element and the input terminal of the first rectifier, and a second terminal of the first capacitor and a second terminal of the second capacitor grounded.

[0007] Optionally, the first rectifier includes a first resistor and a first diode. The first end of the first resistor is connected to the output terminal of the noise reduction device and the positive terminal of the first diode. The second end of the first resistor is grounded, and the negative terminal of the first diode is connected to the input terminal of the first filter.

[0008] Optionally, the first filter includes a third capacitor, a second resistor, and a fourth capacitor. The first terminal of the third capacitor is connected to the output terminal of the first rectifier and the first terminal of the second resistor. The second terminal of the third capacitor is grounded. The second terminal of the second resistor is connected to the first terminal of the fourth capacitor and the output terminal of the first filter. The second terminal of the fourth capacitor is grounded.

[0009] Optionally, the voltage converter includes a third resistor, a fourth resistor, and a fifth resistor. The first ends of the third resistor, the fourth resistor, and the fifth resistor are connected to the first end of the inductor and the input end of the second rectifier. The second ends of the third resistor, the fourth resistor, the fifth resistor, and the inductor are grounded.

[0010] Optionally, the second rectifier includes a second diode, the anode of which is connected to the input terminal of the voltage converter, and the cathode of which is connected to the input terminal of the second filter.

[0011] Optionally, the second filter includes a fifth capacitor, a sixth resistor, and a sixth capacitor. The first terminal of the fifth capacitor is connected to the output terminal of the second rectifier and the first terminal of the sixth resistor. The second terminal of the fifth capacitor is grounded. The second terminal of the sixth resistor is connected to the first terminal of the sixth capacitor and the output terminal of the second filter. The second terminal of the sixth capacitor is grounded.

[0012] Optionally, the sensor further includes a signal amplification unit, a first calibration unit, and a second calibration unit disposed on the PCB board; the signal amplification unit is used to amplify the electrical signals output by the voltage processing unit and the current processing unit; The first calibration unit includes a first adjustable rheostat, the first fixed terminal of the first adjustable rheostat is connected to the output terminal of the first filter, the second fixed terminal of the first adjustable rheostat is grounded, and the sliding terminal of the first adjustable rheostat is connected to the first input terminal of the signal amplification unit. The second calibration unit includes a second adjustable rheostat, the first fixed terminal of which is connected to the output terminal of the second filter, the second fixed terminal of which is grounded, and the sliding terminal of which is connected to the second input terminal of the signal amplification unit.

[0013] Optionally, the current and voltage detection device of this application further includes a mounting block and a coupling module, wherein the coupling module includes an insulating block and a conductive rod; The insulating block has insulating holes that extend through both ends of the insulating block. One end of the conductive rod is inserted into the insulating hole, and the other end of the conductive rod is configured to be electrically connected to the cable under test. The mounting block has a mounting groove extending through the first end of the mounting block, and a mounting hole extending through both sides of the mounting block at the second end of the mounting block. The bottom wall of the mounting groove communicates with the side wall of the mounting hole. The insulating block is inserted into the mounting hole, and the sensor is installed in the mounting groove. The side of the sensor with the detection probe faces the bottom wall of the mounting groove. The detection probe passes through the bottom wall of the mounting groove and the connection between the mounting groove and the mounting hole, and abuts against one side of the insulating block.

[0014] This application mounts the voltage sensing element of the detection probe onto an inductor, and electrically connects the voltage sensing element and the inductor to a voltage processing unit and a current processing unit, respectively. During detection, simply bringing the detection probe close to the cable under test allows the voltage of the cable to be measured using the voltage sensing element and the voltage processing unit, while the inductor and the current processing unit measure the current of the cable. This enables the sensor to simultaneously measure both the current and voltage of the cable under test. Furthermore, by using separate circuits to detect the current and voltage of the cable under test, crosstalk caused by a single circuit simultaneously measuring both voltage and current is avoided, thus improving the sensor's anti-interference capability. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the sensor according to an embodiment of this application.

[0016] Figure 2 This is a circuit diagram of the sensor in an embodiment of this application.

[0017] Figure 3 This is a three-dimensional structural diagram of the current and voltage detection device of this application.

[0018] Figure 4 This is an exploded structural diagram of the current and voltage detection device of this application.

[0019] Figure 5 for Figure 3 A sectional view along line AA. Detailed Implementation

[0020] To explain in detail the technical content, structural features, objectives and effects of this application, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0021] Please see Figures 1 to 5This application discloses a current and voltage detection device for a high-voltage coaxial cable, including a sensor 1. The sensor 1 includes a detection probe 11 and a PCB board 12. The detection probe 11 includes an inductor CT1 and a voltage sensing element VP1. One end of the inductor CT1 is mounted on one side of the PCB board 12. One end of the voltage sensing element VP1 is attached to the end of the inductor CT1 away from the PCB board 12, and the other end of the voltage sensing element VP1 is bent and attached to one side of the inductor CT1 and electrically connected to the PCB board 12. A signal processing module 13 is provided on the PCB board 12. The signal processing module 13 includes a voltage processing unit 131 electrically connected to the voltage sensing element VP1 and a current processing unit 132 electrically connected to the inductor CT1. The current processing unit 132 is used to process the current of the cable under test (not shown) obtained by the inductor CT1, and the voltage processing unit 131 is used to process the voltage of the cable under test obtained by the voltage sensing element VP1.

[0022] During testing, the detection probe 11 is brought close to the cable under test. Since the cable under test carries alternating current, and the voltage sensing element VP1 and the cable under test are equivalent to a pair of plates of a capacitor, according to the principle of capacitive coupling, the voltage sensing element VP1 can obtain the voltage of the cable under test. At the same time, the change in magnetic flux caused by the alternating current around the cable under test generates a corresponding induced electromotive force on the magnetic core of the inductor CT1. Therefore, the sensor 1 of this application will generate corresponding current and voltage in the inductor CT1 and the voltage sensing element VP1 of the detection probe 11. The voltage generated by the voltage sensing element VP1 and the current generated by the inductor CT1 are respectively input to the voltage processing unit 131 and the current processing unit 132 for processing to obtain the voltage and current of the cable under test. If the output terminals of the voltage processing unit 131 and the current processing unit 132 are connected to other components (such as the main control chip), the other components can obtain the voltage and current of the cable under test accordingly, and then use the voltage and current of the cable under test obtained by the sensor 1 for further analysis or processing.

[0023] In this application, the voltage sensing element VP1 of the detection probe 11 is attached to the inductor CT1, and the voltage sensing element VP1 and the inductor CT1 are electrically connected to the voltage processing unit 131 and the current processing unit 132, respectively. During detection, the detection probe 11 only needs to be brought close to the cable under test. The voltage sensing element VP1 and the voltage processing unit 131 can measure the voltage of the cable under test, while the inductor CT1 and the current processing unit 132 can measure the current of the cable under test. Thus, the sensor 1 can simultaneously detect the current and voltage of the cable under test. Furthermore, by using different circuits to detect the current and voltage of the cable under test, crosstalk can be avoided, which helps to improve the anti-interference capability of the sensor 1.

[0024] Please see Figure 2In some embodiments, the voltage processing unit 131 includes a noise reduction unit 1311, a first rectifier 1312, and a first filter 1313 connected in sequence, with the noise reduction unit 1311 electrically connected to the voltage sensing element VP1; the current processing unit 132 includes a voltage converter 1321, a second rectifier 1322, and a second filter 1323 connected in sequence, with the voltage converter 1321 electrically connected to the inductor CT1, and the voltage converter 1321 is used to convert the current signal obtained by the inductor CT1 into a voltage signal.

[0025] Specifically, the first filter 1313 and / or the second rectifier 1322 are π-type filters.

[0026] Specifically, the noise reduction device 1311 includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 and the first end of the second capacitor C2 are electrically connected to the voltage sensing element VP1 and the input end of the first rectifier 1312. The second end of the first capacitor C1 and the second end of the second capacitor C2 are grounded. The high-frequency signal in the voltage signal obtained by the voltage sensing element VP1 is introduced to the ground through the first capacitor C1 and the second capacitor C2, which can filter out the high-frequency signal in the voltage signal and make the detected voltage signal more accurate.

[0027] Specifically, the first rectifier 1312 includes a first resistor R1 and a first diode D1. The first end of the first resistor R1 is connected to the output terminal of the noise reducer 1311 and the positive terminal of the first diode D1. The second end of the first resistor R1 is grounded, and the negative terminal of the first diode D1 is connected to the input terminal of the first filter 1313.

[0028] Specifically, the first filter 1313 includes a third capacitor C3, a second resistor R2, and a fourth capacitor C4. The first terminal of the third capacitor C3 is connected to the output terminal of the first rectifier 1312 and the first terminal of the second resistor R2, and the second terminal of the third capacitor C3 is grounded. The second terminal of the second resistor R2 is connected to the first terminal of the fourth capacitor C4 and the output terminal of the first filter 1313, and the second terminal of the fourth capacitor C4 is grounded. The third capacitor C3, the second resistor R2, and the fourth capacitor C4 form a π-type filter, which can filter the voltage signal output by the first rectifier 1312.

[0029] Specifically, the voltage converter 1321 includes a third resistor R3, a fourth resistor R4, and a fifth resistor R5. The first end of the third resistor R3, the first end of the fourth resistor R4, and the first end of the fifth resistor R5 are connected to the first end of the inductor CT1 and the input end of the second rectifier 1322. The second ends of the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the second end of the inductor CT1 are grounded.

[0030] Specifically, the second rectifier 1322 includes a second diode D2. The anode of the second diode D2 is connected to the input terminal of the voltage converter 1321, and the cathode of the second diode D2 is connected to the input terminal of the second filter 1323. It can be understood that before rectification using the second diode D2, the current signal needs to be converted into a voltage signal. Therefore, before the electrical signal obtained by the inductor CT1 is input to the second rectifier 1322, the voltage converter 1321 is needed to convert the current signal into a voltage signal.

[0031] Specifically, the second filter 1323 includes a fifth capacitor C5, a sixth resistor R6, and a sixth capacitor C6. The first end of the fifth capacitor C5 is connected to the output terminal of the second rectifier 1322 and the first end of the sixth resistor R6. The second end of the fifth capacitor C5 is grounded. The second end of the sixth resistor R6 is connected to the first end of the sixth capacitor C6 and the output terminal of the second filter 1323. The second end of the sixth capacitor C6 is grounded.

[0032] To further improve the accuracy of the voltage and current signals acquired by sensor 1 and to facilitate subsequent processing by other components, it is also necessary to calibrate and amplify the signals output by voltage processing unit 131 and current processing unit 132. Specifically, sensor 1 also includes a signal amplification unit CN1, a first calibration unit 15, and a second calibration unit 16 mounted on PCB board 12. The signal amplification unit CN1 amplifies the electrical signals output by the voltage processing unit 131 and the current processing unit 132. The first calibration unit 15 includes a first adjustable rheostat VR1, with its first fixed-line terminal connected to the output terminal of the first filter 1313, its second fixed-line terminal grounded, and its sliding terminal connected to the first input terminal of the signal amplification unit CN1. The second calibration unit 16 includes a second adjustable rheostat VR2, with its first fixed-line terminal connected to the output terminal of the second filter 1323, its second fixed-line terminal grounded, and its sliding terminal connected to the second input terminal of the signal amplification unit CN1. The signal amplification unit CN1 can utilize two operational amplifiers to amplify the output signals of the voltage processing unit 131 and the current processing unit 132, but this is not the only possible amplification method. In practical use, the main control chip can be connected to the output terminal of the signal amplification unit CN1 to receive the electrical signal amplified by the signal amplification unit CN1.

[0033] Please see Figures 1 to 5In some embodiments, the current and voltage detection device of this application further includes a mounting block 2 and a coupling module 3. The coupling module 3 includes an insulating block 31 and a conductive rod 32. The insulating block 31 has an insulating hole 311 penetrating both ends of the insulating block 31, and the conductive rod 32 is inserted into the insulating hole 311. One end of the conductive rod 32 is configured to be electrically connected to the cable under test. The first end of the mounting block 2 has a mounting groove 21 penetrating to the first end of the mounting block 2, and the second end of the mounting block 2 has a mounting hole 22 penetrating both sides of the mounting block 2. The bottom wall of the mounting groove 21 communicates with the side wall of the mounting hole 22. The insulating block 31 is inserted into the mounting hole 22, and the sensor 1 is installed in the mounting groove 21. The side of the sensor 1 with the detection probe 11 faces the bottom wall of the mounting groove 21. The detection probe 11 passes through the bottom wall of the mounting groove 21 through the connection between the mounting groove 21 and the mounting hole 22, and abuts against one side of the insulating block 31.

[0034] This application utilizes an insulating block 31 to isolate the conductive rod 32 from the sensor 1, ensuring that the sensor 1 does not directly contact the conductive rod 32 and preventing damage to the sensor 1. Simultaneously, this application uses a mounting block 2 to fix the sensor 1 and the conductive rod 32, facilitating use.

[0035] Specifically, the insulating block 31 can be made of Teflon.

[0036] Specifically, a positioning groove 312 for positioning sensor 1 is provided on one side of the insulating block 31, and one end of the detection probe 11 of sensor 1 is inserted into the positioning groove 312.

[0037] Specifically, a connecting plate 33 is fixed to the end of the conductive rod 32 away from the insulating block 31. The connecting plate 33 is fixed to one side of the mounting block 2. The side of the connecting plate 33 away from the conductive rod 32 extends into an extension 34. A plug-in groove 341 is provided at the end of the extension 34 away from the connecting plate 33. The plug-in groove 341 is configured to insert the test cable, thereby facilitating the electrical connection between the conductive rod 32 and the test cable.

[0038] Specifically, the current and voltage detection device of this application also includes a fixing plate 4, which is fixed to the top of the mounting groove 21 to prevent the sensor 1 from slipping off.

[0039] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the scope of this application shall still fall within the scope of this application.

Claims

1. A current and voltage detection device for a high-voltage coaxial cable, characterized in that, The system includes a sensor, which comprises a detection probe and a PCB board. The detection probe includes an inductor and a voltage sensing element. One end of the inductor is mounted on one side of the PCB board. One end of the voltage sensing element is attached to the end of the inductor away from the PCB board, and the other end of the voltage sensing element is bent and attached to one side of the inductor and electrically connected to the PCB board. A signal processing module is provided on the PCB board. The signal processing module includes a current processing unit electrically connected to the inductor and a voltage processing unit electrically connected to the voltage sensing element. The current processing unit is used to process the current of the cable under test obtained by the inductor, and the voltage processing unit is used to process the voltage of the cable under test obtained by the voltage sensing element.

2. The current and voltage detection device as described in claim 1, characterized in that, The voltage processing unit includes a noise reducer, a first rectifier, and a first filter connected in sequence, with the noise reducer electrically connected to the voltage sensing element; the current processing unit includes a voltage converter, a second rectifier, and a second filter connected in sequence, with the voltage converter electrically connected to the inductor, and the voltage converter is used to convert the current signal acquired by the inductor into a voltage signal.

3. The current and voltage detection device as described in claim 2, characterized in that, The noise reduction device includes a first capacitor and a second capacitor. The first end of the first capacitor and the first end of the second capacitor are electrically connected to the voltage sensing element and the input terminal of the first rectifier. The second end of the first capacitor and the second end of the second capacitor are grounded.

4. The current and voltage detection device as described in claim 2, characterized in that, The first rectifier includes a first resistor and a first diode. The first end of the first resistor is connected to the output terminal of the noise reduction device and the positive terminal of the first diode. The second end of the first resistor is grounded, and the negative terminal of the first diode is connected to the input terminal of the first filter.

5. The current and voltage detection device as described in claim 2, characterized in that, The first filter includes a third capacitor, a second resistor, and a fourth capacitor. The first terminal of the third capacitor is connected to the output terminal of the first rectifier and the first terminal of the second resistor. The second terminal of the third capacitor is grounded. The second terminal of the second resistor is connected to the first terminal of the fourth capacitor and the output terminal of the first filter. The second terminal of the fourth capacitor is grounded.

6. The current and voltage detection device as described in claim 2, characterized in that, The voltage converter includes a third resistor, a fourth resistor, and a fifth resistor. The first ends of the third resistor, the fourth resistor, and the fifth resistor are connected to the first end of the inductor and the input end of the second rectifier. The second ends of the third resistor, the fourth resistor, the fifth resistor, and the inductor are grounded.

7. The current and voltage detection device as described in claim 2, characterized in that, The second rectifier includes a second diode, the anode of which is connected to the input terminal of the voltage converter, and the cathode of which is connected to the input terminal of the second filter.

8. The current and voltage detection device as described in claim 2, characterized in that, The second filter includes a fifth capacitor, a sixth resistor, and a sixth capacitor. The first terminal of the fifth capacitor is connected to the output terminal of the second rectifier and the first terminal of the sixth resistor. The second terminal of the fifth capacitor is grounded. The second terminal of the sixth resistor is connected to the first terminal of the sixth capacitor and the output terminal of the second filter. The second terminal of the sixth capacitor is grounded.

9. The current and voltage detection device according to any one of claims 2 to 8, characterized in that, The sensor also includes a signal amplification unit, a first calibration unit, and a second calibration unit disposed on the PCB board; the signal amplification unit is used to amplify the electrical signals output by the voltage processing unit and the current processing unit; The first calibration unit includes a first adjustable rheostat, the first fixed terminal of the first adjustable rheostat is connected to the output terminal of the first filter, the second fixed terminal of the first adjustable rheostat is grounded, and the sliding terminal of the first adjustable rheostat is connected to the first input terminal of the signal amplification unit. The second calibration unit includes a second adjustable rheostat, the first fixed terminal of which is connected to the output terminal of the second filter, the second fixed terminal of which is grounded, and the sliding terminal of which is connected to the second input terminal of the signal amplification unit.

10. The current and voltage detection device as described in claim 1, characterized in that, It also includes a mounting block and a coupling module, the coupling module comprising an insulating block and a conductive rod; The insulating block has insulating holes that extend through both ends of the insulating block, and the conductive rod is inserted into the insulating holes. One end of the conductive rod is configured to be electrically connected to the cable under test. The mounting block has a mounting groove extending through the first end of the mounting block, and a mounting hole extending through both sides of the mounting block at the second end of the mounting block. The bottom wall of the mounting groove communicates with the side wall of the mounting hole. The insulating block is inserted into the mounting hole, and the sensor is installed in the mounting groove. The side of the sensor with the detection probe faces the bottom wall of the mounting groove. The detection probe passes through the bottom wall of the mounting groove and the connection between the mounting groove and the mounting hole, and abuts against one side of the insulating block.

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