Non-contact current nuclear phase device
By using a non-contact current phase comparison device and employing the vertical arrangement of multiple sets of magnetic core coils and signal processing technology, the problems of low spatial resolution and poor anti-interference ability of traditional sensors are solved, achieving higher precision current measurement and convenient installation.
Patent Information
- Application Number
- CN202520364469.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-04
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-04
AI Technical Summary
Traditional single-coil and TMR sensors have low spatial resolution, poor anti-interference ability, and strict measurement conditions, making them difficult to meet the needs of modern complex power systems. In particular, they have large errors and are inconvenient to install when measuring small currents.
A non-contact current phase comparison device is adopted, including a three-phase cable, a coil array, a signal receiving and processing device, and a host computer. The coil array is set between the signal receiving and processing device and the three-phase cable. By using the vertical arrangement and equal spacing of multiple sets of coils with magnetic cores, the effective signal is separated by magnetic field superposition. Combined with the signal processing device, filtering and data acquisition are performed to improve measurement accuracy and anti-interference ability.
It achieves higher spatial resolution and anti-interference capability, can more accurately identify current phase, reduce measurement error, and is more convenient and safer to install.
Smart Images
Figure CN223883667U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to power detection technical field especially relates to a non -contact current phase checking device. BACKGROUND
[0002] The coil array induction technology is a method for sensing current signals through multiple coil arrays. This technology is widely used in power systems, well logging, and non-destructive testing fields. Traditional single coil and TMR sensors have low spatial resolution, poor anti-interference ability, and too strict measurement conditions, making it difficult to meet the needs of modern complex power systems. When using TMR sensors to detect small currents, there are obvious performance deficiencies. To measure a current of about 5A, an amplification factor of about 10,000 is required to obtain a voltage value of about 200mV. When measuring small currents, the error of the calculation result will increase sharply. When the cable is located inside the switch cabinet, the TMR device is also inconvenient to install. It needs to be installed close to the cable or around the cable, which leads to safety problems of the measuring device. SUMMARY
[0003] Therefore, the utility model discloses a non -contact current phase checking device, which solves the technical problems of low spatial resolution, poor anti-interference ability, and too strict measurement conditions of traditional single coil and TMR sensors.
[0004] The utility model provides a non -contact current phase checking device, it includes:
[0005] Three -phase cable, coil array, signal receiving processing device and host computer;
[0006] Coil array, signal receiving processing device and host computer are electrically connected in proper order, and coil array is arranged between signal receiving processing device and three -phase cable.
[0007] Preferably,
[0008] The coil array includes a first coil group, a second coil group, and a third coil group.
[0009] The first coil group, the second coil group, and the third coil group are fixedly arranged above the signal receiving processing device at equal intervals.
[0010] Preferably,
[0011] The first coil group includes a first magnetic core-containing coil and a fourth magnetic core-containing coil.
[0012] The second coil group includes a second magnetic core-containing coil and a fifth magnetic core-containing coil.
[0013] The third coil group includes a third magnetic core-containing coil and a sixth magnetic core-containing coil.
[0014] The first magnetic core-containing coil, the second magnetic core-containing coil and the third magnetic core-containing coil are located on the same horizontal line.
[0015] Preferably,
[0016] The fourth magnetic core-containing coil, the fifth magnetic core-containing coil and the sixth magnetic core-containing coil are arranged above the first magnetic core-containing coil, the second magnetic core-containing coil and the third magnetic core-containing coil respectively.
[0017] The intervals between the fourth magnetic core-containing coil, the fifth magnetic core-containing coil and the sixth magnetic core-containing coil are equal.
[0018] The distance between the fourth magnetic core-containing coil and the first magnetic core-containing coil is x1, the distance between the fifth magnetic core-containing coil and the second magnetic core-containing coil is x2, the distance between the sixth magnetic core-containing coil and the third magnetic core-containing coil is x3, and x1, x2 and x3 are equal.
[0019] Preferably,
[0020] The sensitive directions of the fourth magnetic core-containing coil and the first magnetic core-containing coil are perpendicular to each other, the sensitive directions of the fifth magnetic core-containing coil and the second magnetic core-containing coil are perpendicular to each other, and the sensitive directions of the sixth magnetic core-containing coil and the third magnetic core-containing coil are perpendicular to each other.
[0021] Preferably,
[0022] The signal receiving processing device comprises a PCB board, a signal receiving terminal, an operational amplifier module, an AD module, a single-chip microcomputer system and a power supply module.
[0023] The signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system and the power supply module are arranged on the PCB board.
[0024] The power supply module is electrically connected with the operational amplifier module, and the coil array, the signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system and the upper computer are electrically connected in sequence.
[0025] Preferably,
[0026] The AD module adopts an AD7606 chip, and the AD module adopts 6-way parallel port analog signal input and 1-way digital signal output.
[0027] Preferably,
[0028] The single-chip microcomputer system adopts an STM32F407VET6 chip, and the single-chip microcomputer system is connected with the upper computer through a serial port.
[0029] The utility model has the following beneficial effects:
[0030] 1. By placing the coil array between the signal receiving and processing device and the three-phase cable, the sensor and cable are not placed too close together, the measurement conditions are more relaxed, and the safety of the measurement device installation is better guaranteed.
[0031] 2. Each coil group in the coil array has a structure of two magnetic core coils with mutually perpendicular sensitive directions, which can better eliminate interference signals. The magnetic core coil contains a manganese-zinc magnetic core, which enhances the sensitivity of the coil, enables the measurement of smaller currents, achieves measurement over longer distances, and makes the installation of measuring devices more convenient. Attached Figure Description
[0032] Figure 1 This is a structural diagram of a non-contact current phase rendition device;
[0033] 7 - Signal receiving terminal; 8 - Operational amplifier module; 9 - AD module; 10 - Microcontroller system; 11 - Power supply module;
[0034] Figure 2 This is a structural diagram of a coil array;
[0035] 1-First coil containing a magnetic core, 2-Second coil containing a magnetic core, 3-Third coil containing a magnetic core, 4-Fourth coil containing a magnetic core, 6-Fifth coil containing a magnetic core, 6-Sixth coil containing a magnetic core;
[0036] Figure 3 This is the schematic diagram of the power supply module;
[0037] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0038] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.
[0039] In most 10kV power systems, according to national standards, the safe distance between three-phase cables is at least 125mm, while the spacing between three-phase busbars is specified as 200mm. Assuming the cable direction is the Z-axis, the magnetic field generated by the cable can be decomposed into x and y directions; therefore, each coil group contains two sensitive directions. The magnetic field received by each coil group actually originates from the superposition of the magnetic fields generated by the three-phase cables. The key issue is how to separate the effective signal or eliminate interference from other cables' magnetic fields to find the effective signal. To address the difficulty in eliminating interference, refer to... Figure 1 This utility model provides a non-contact current phase comparison device, comprising:
[0040] Three-phase cable, coil array, signal receiving and processing device, and host computer;
[0041] The coil array, the signal receiving and processing device, and the host computer are sequentially electrically connected, and the coil array is arranged between the signal receiving and processing device and the three-phase cable.
[0042] Specifically, in Figure 1 , A, B, and C represent three black lines of the three-phase cable, the plane where the coil array is located is the XOY plane, the coil array is installed on a space parallel to the plane where the three-phase cable is located, and is 5 cm away from the plane where the cable is located, the currents with an amplitude of 1A and a phase difference of 120 degrees are passed through the three-phase cable, the non-contact current phase device is placed in front of the three-phase cable at a distance of about 5 cm, the current signal is collected, and output to the host computer to obtain the three-phase current waveform, and the maximum error of the phase difference is not more than 8.4%, which can better identify the current phase.
[0043] As an embodiment:
[0044] The coil array comprises a first coil group, a second coil group, and a third coil group.
[0045] The first coil group, the second coil group, and the third coil group are sequentially and equidistantly arranged above the signal receiving and processing device.
[0046] Specifically, the structure of the coil array is as shown in Figure 2 , the coil array uses the positional relationship between the multiple coil groups to change the interference term into a part of the current phase process through the superposition relationship of the magnetic field, the three coil groups are installed on the same horizontal plane and arranged equidistantly, and the middle coil group is aligned with the middle phase (B phase) cable. By introducing the coil array, the spatial resolution and anti-interference ability of the signal can be significantly improved, so that the current signal can be more accurately sensed and measured. In addition, the coil array can also optimize the signal acquisition and processing process by adjusting the arrangement of the coils and the working frequency, and further improve the measurement accuracy.
[0047] As an embodiment:
[0048] The first coil group comprises a first magnetic core-containing coil and a fourth magnetic core-containing coil.
[0049] The second coil group comprises a second magnetic core-containing coil and a fifth magnetic core-containing coil.
[0050] The third coil group comprises a third magnetic core-containing coil and a sixth magnetic core-containing coil.
[0051] The first magnetic core-containing coil, the second magnetic core-containing coil, and the third magnetic core-containing coil are located on the same horizontal line.
[0052] Specifically, the coil group is used to sense the voltage signal, and the signal is processed by a Butterworth first-order band-pass filter to filter out the interference of high-frequency noise and direct current components.
[0053] As an embodiment:
[0054] The fourth magnetic core-containing coil, the fifth magnetic core-containing coil and the sixth magnetic core-containing coil are arranged above the first magnetic core-containing coil, the second magnetic core-containing coil and the third magnetic core-containing coil respectively;
[0055] The intervals between the fourth magnetic core-containing coil, the fifth magnetic core-containing coil and the sixth magnetic core-containing coil are equal;
[0056] The distance between the fourth magnetic core-containing coil and the first magnetic core-containing coil is x1, the distance between the fifth magnetic core-containing coil and the second magnetic core-containing coil is x2, the distance between the sixth magnetic core-containing coil and the third magnetic core-containing coil is x3, and x1, x2 and x3 are equal.
[0057] Specifically, the coils arranged above and below are a group, and the height difference between the upper and lower coils is 2cm, that is, x1, x2 and x3 are all set to 2cm.
[0058] As an embodiment:
[0059] The sensitive directions of the fourth magnetic core-containing coil and the first magnetic core-containing coil are perpendicular to each other, the sensitive directions of the fifth magnetic core-containing coil and the second magnetic core-containing coil are perpendicular to each other, and the sensitive directions of the sixth magnetic core-containing coil and the third magnetic core-containing coil are perpendicular to each other.
[0060] Specifically, the three groups of coil groups are arranged at equal intervals, each group of coil groups is provided with two magnetic core-containing coils with different sensitive directions, which are perpendicular to each other, and the two magnetic core-containing coils are arranged above and below, the magnetic core-containing coils contain manganese-zinc magnetic cores, which are used for aggregating magnetic fields and enhancing the performance of the coil sensor.
[0061] As an embodiment:
[0062] The signal receiving processing device comprises a PCB board, a signal receiving terminal, an operational amplifier module, an AD module, a single-chip microcomputer system and a power supply module.
[0063] The signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system and the power supply module are arranged on the PCB board.
[0064] The power supply module is electrically connected with the operational amplifier module, and the coil array, the signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system and the upper computer are electrically connected in sequence.
[0065] Specifically, the signal receiving terminal receives the voltage signal generated by the coil array, and the voltage signal obtains a preliminary effective signal after passing through the operational amplifier module, the operational amplifier module is powered by the battery through the power supply module, and the schematic diagram of the power supply module is as follows: Figure 3The AD module is used for sampling, and the sampled signal is output to the single-chip microcomputer system; the obtained sampling signal is sent to the upper computer through the serial port of the single-chip microcomputer for signal processing, and the nuclear phase operation is completed.
[0066] As an embodiment:
[0067] The AD module adopts an AD7606 chip, and the AD module adopts 6-way parallel port analog signal input and 1-way digital signal output.
[0068] Specifically, the AD7606 chip allows simultaneous 8-channel data conversion, and can sample and output analog signals at high speed.
[0069] As an embodiment:
[0070] The single-chip microcomputer system adopts an STM32F407VET6 chip, and the single-chip microcomputer system is connected with the upper computer through a serial port.
[0071] Specifically, the main frequency of the STM32F407VET6 chip is 168Mhz, which is used for receiving data of the AD7606 and outputting to the upper computer through the serial port.
[0072] It should be noted that in this article, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or system. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or system including the element.
[0073] The above-mentioned embodiment serial numbers of the utility model are only for description, and do not represent the advantages and disadvantages of the embodiments. In the unit claims of several devices, several of these devices can be embodied by the same hardware item. The use of the words first, second, and third does not indicate any order, and these words can be interpreted as identifiers.
[0074] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structure or equivalent process transformation using the contents of the utility model specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the utility model.
Claims
1. A non-contact current phase checking device, characterized by, The non-contact current phase device comprises a three-phase cable, a coil array, a signal receiving and processing device, and a host computer. The coil array, the signal receiving and processing device, and the host computer are sequentially electrically connected, and the coil array is arranged between the signal receiving and processing device and the three-phase cable.
2. The non-contact current phase device according to claim 1, wherein: The coil array comprises a first coil group, a second coil group, and a third coil group. The first coil group, the second coil group, and the third coil group are sequentially and equidistantly arranged above the signal receiving and processing device.
3. The non-contact current phase device according to claim 2, wherein: The first coil group comprises a first magnetic core-containing coil and a fourth magnetic core-containing coil. The second coil group comprises a second magnetic core-containing coil and a fifth magnetic core-containing coil. The third coil group comprises a third magnetic core-containing coil and a sixth magnetic core-containing coil. The first magnetic core-containing coil, the second magnetic core-containing coil, and the third magnetic core-containing coil are located on the same horizontal line.
4. The non-contact current phase device according to claim 3, wherein: The fourth magnetic core-containing coil, the fifth magnetic core-containing coil, and the sixth magnetic core-containing coil are arranged above the first magnetic core-containing coil, the second magnetic core-containing coil, and the third magnetic core-containing coil, respectively. The distances between the fourth magnetic core-containing coil, the fifth magnetic core-containing coil, and the sixth magnetic core-containing coil are equal. The distance between the fourth magnetic core-containing coil and the first magnetic core-containing coil is x1, the distance between the fifth magnetic core-containing coil and the second magnetic core-containing coil is x2, and the distance between the sixth magnetic core-containing coil and the third magnetic core-containing coil is x3, and x1, x2, and x3 are equal.
5. The non-contact current phase device according to claim 4, wherein: The sensitive directions of the fourth magnetic core-containing coil and the first magnetic core-containing coil are perpendicular to each other, the sensitive directions of the fifth magnetic core-containing coil and the second magnetic core-containing coil are perpendicular to each other, and the sensitive directions of the sixth magnetic core-containing coil and the third magnetic core-containing coil are perpendicular to each other.
6. The non-contact current phase device according to claim 1, wherein: The signal receiving and processing device comprises a PCB board, a signal receiving terminal, an operational amplifier module, an AD module, a single-chip microcomputer system, and a power supply module. The signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system, and the power supply module are arranged on the PCB board. The power supply module is electrically connected with the operational amplifier module, and the coil array, the signal receiving terminal, the operational amplifier module, the AD module, the single-chip microcomputer system, and the host computer are sequentially electrically connected.
7. The non-contact current phase device according to claim 6, wherein: The AD module adopts an AD7606 chip, and the AD module adopts 6-way parallel port analog signal input and 1-way digital signal output.
8. The non-contact current phase device according to claim 6, wherein: The single-chip microcomputer system adopts an STM32F407VET6 chip, and the single-chip microcomputer system is connected with the host computer through a serial port.