CN115524533A - Electrical quantity integrated measuring device and method - Google Patents

Abstract

The application relates to an electrical quantity integrated measuring device and method. The equipment comprises an electrical quantity integrated sensor arranged on a power line to be detected, wherein the electrical quantity integrated sensor comprises a non-invasive voltage measuring unit and a non-invasive current measuring unit; the non-invasive voltage measuring unit is used for acquiring and outputting current information of a wire to be detected in the power line to be detected; the non-invasive voltage measuring unit is used for acquiring and outputting voltage information of the wire to be measured; the signal processing unit is connected with the electric quantity integrated sensor; the signal processing unit is used for receiving and processing the current information and the voltage information to obtain voltage and current waveform information and processing the voltage and current waveform information to obtain an electric quantity measuring result of the lead to be measured; the electrical quantity measurement results include a frequency measurement result, a harmonic measurement result, a phase measurement result, and a power measurement result. This application can be accomplished and integrated the measuring to the electric volume of the wire that awaits measuring.

Description

Electrical quantity integrated measuring device and method

technical field

The present application relates to the technical field of power measurement, in particular to an integrated measurement device and method for electrical quantities.

Background technique

Electrical quantities refer to various parameters directly related to electricity in the power system, common parameters such as voltage value, current value, frequency, phase, power, power direction and so on. The accurate measurement of electrical quantities is the main technical means to reflect the operating state of the power system. In terms of electrical quantity integrated sensing technology, different types of sensors are still relatively independent in terms of device form. According to the division of devices, the current electrical quantity sensors suitable for power systems can be divided into current transformers, voltage transformers, frequency transmitters, phase sensors, harmonic monitoring devices, power monitoring devices and other categories.

However, different types of electrical quantity sensors still maintain a relatively independent state in terms of device form, and there are still problems such as inconsistent data interfaces, troublesome installation and debugging, and difficult equipment maintenance and management.

Contents of the invention

Based on this, it is necessary to provide an integrated measurement device and method for electrical quantities aiming at the above technical problems.

In the first aspect, the present application provides an integrated electrical quantity measuring device, which includes:

The electrical quantity integrated sensor set on the power line to be detected, the electrical quantity integrated sensor includes a non-intrusive voltage measurement unit and a non-invasive current measurement unit; the non-invasive voltage measurement unit is used to obtain and output the wire to be tested in the power line to be detected The current information; the non-intrusive voltage measurement unit is used to obtain and output the voltage information of the wire to be tested;

A signal processing unit, the signal processing unit is connected to the electrical quantity integrated sensor; the signal processing unit is used to receive and process current information and voltage information, obtain voltage and current waveform information, and process voltage and current waveform information to obtain the electrical quantity measurement result of the wire to be tested; The electrical quantity measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results.

In one of the embodiments, there is no electrical contact between the electrical quantity integrated sensor and the wire to be tested; the current information includes a current measurement signal; the voltage information includes a voltage measurement signal;

The non-invasive current measurement unit includes a current probe and a magnetic core; the magnetic core is provided with an air gap and is set in the power line to be tested; the current probe is set in the air gap, and the current probe is used to sense the The magnetic field changes to output the current measurement signal to the signal processing unit;

The non-invasive voltage measurement unit includes a voltage probe, a reference voltage module and a current-voltage conversion element connected in sequence; the voltage probe is used to form a coupling capacitance with the wire to be tested; the reference voltage module is used to output a reference signal; the current-voltage conversion element One end is used for grounding, and the other end of the current-voltage conversion element is used to output voltage measurement signals to the signal processing unit;

The signal processing unit includes a signal conditioning module, a signal sampling module, and a processing chip connected in sequence; the signal conditioning module is respectively connected to a current probe and a current-voltage conversion element, and is used to receive current measurement signals and voltage measurement signals, and perform current measurement signals and voltage measurement signals. The signal is signal-conditioned, and the conditioned measurement signal is output to the signal sampling module; the signal sampling module is used to sample the conditioned measurement signal, and the output voltage and current waveform information is sent to the processing chip; the processing chip is connected to the reference voltage module for adjusting the reference voltage The reference signal output by the voltage module and the corresponding algorithm are used to process the voltage and current waveform information to obtain the measurement result of the electrical quantity.

In one of the embodiments, the electric quantity integrated sensor is used for clamping on the power line to be detected; the voltage probe includes a circular metal copper foil;

The current-voltage conversion element is a voltage-dividing capacitor; the device also includes a ground probe connected to the voltage-dividing capacitor.

In one of the embodiments, the processing chip includes a single-chip microcomputer; the signal sampling module includes an analog-to-digital conversion chip; the signal conditioning module is used to perform standard signal conversion on the current measurement signal and the voltage measurement signal;

The signal processing unit also includes a communication module connected to the processing chip for outputting electrical quantity measurement results.

In one of the embodiments, the signal conditioning module includes one or more of a voltage follower circuit, an active filter circuit, a passive filter circuit, an RC phase shift correction circuit, and an active operational amplifier circuit;

The communication module includes a bluetooth chip and an antenna; the processing chip is connected to the antenna through the bluetooth chip.

In one of the embodiments, the current probe is a magnetic field sensitive element; the current measurement signal includes the output voltage of the magnetic field sensitive element;

The electric quantity measurement result also includes the flow direction determined based on the current direction; the current direction is obtained based on the output voltage.

In one embodiment, the magnetic field sensitive element includes any one of a tunnel magnetoresistive element TMR, a Hall element, a Rogowski coil probe, and a multilayer PCB coil probe.

In one of the embodiments, the device further includes an energy harvesting device;

The energy-taking device is connected to the signal processing unit, and is used for taking power from the power line to be detected to supply power to the signal processing unit.

In one of the embodiments, the energy harvesting device includes:

The energy-taking magnetic core is sleeved on the power line to be tested;

The energy-taking coil is wound on the energy-taking magnetic core;

The protection module is connected to the energy-taking coil;

A power circuit, one end of the power circuit is connected to the protection module, and the other end of the power circuit is connected to the signal processing unit;

Backup battery, connected to the power circuit.

In the second aspect, the present application also provides an integrated electrical quantity measurement method, which is applied to the signal processing unit in the above-mentioned integrated electrical quantity measurement device, and the method includes:

Receive the current information and voltage information transmitted by the electrical integrated sensor;

Process current information and voltage information to obtain voltage and current waveform information;

Process the voltage and current waveform information to obtain the electrical measurement results of the wires to be tested; the electrical measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results; power measurement results include active power measurement results and reactive power measurement results.

The electrical quantity integrated measuring device and method described above completes the electrical quantity measurement of the wire to be tested through the electrical quantity integrated sensor arranged on the power line to be detected and the signal processing unit; wherein, the electrical quantity integrated sensor includes a non-invasive voltage measurement unit and The non-invasive current measurement unit can separately obtain the current information and voltage information of the wire to be tested, and then the signal processing unit can obtain the electrical quantity measurement result of the wire to be tested; this application can realize non-invasive Through the integrated collection of electrical quantity data, the calculation of the frequency, phase, power and harmonics of the conductor to be tested can be completed separately.

Description of drawings

Fig. 1 is an application environment diagram of an electrical quantity integrated measuring device in an embodiment;

Fig. 2 is a schematic structural diagram of an electrical quantity integrated measuring device in an embodiment;

Fig. 3 is a structural block diagram of an electrical quantity integrated measuring device in an embodiment;

Fig. 4 is a schematic diagram of the current measurement principle of a charged conductor in an embodiment;

Fig. 5 is a schematic diagram of the voltage measurement principle of a charged conductor in an embodiment;

Fig. 6 is a simplified schematic circuit diagram of live conductor voltage measurement in one embodiment;

Fig. 7 is a structural block diagram of an electrical quantity integrated measuring device in another embodiment;

Fig. 8 is a specific structural schematic diagram of an electrical quantity integrated measuring device in an embodiment;

Fig. 9 is a schematic flowchart of an integrated measurement method for electrical quantities in an embodiment.

detailed description

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

With the passage of time, different types of electrical quantity sensors lack a unified design, resulting in frequent liability disputes; because the sensors are produced by different equipment manufacturers, there are problems such as mismatching performance and life span of different types of electrical quantity sensors. As a result, problems such as long equipment installation and commissioning cycle and difficulties in later maintenance and management emerge in endlessly; the sensor data interfaces provided by different suppliers are complex and diverse, and transmission signal interference, data packet loss or interconnection often occur between different types of electrical quantity sensors Unsmooth and other situations further lead to problems such as equipment defects or power grid failures.

With the construction of the new power system, a large number of distributed power sources will be widely connected to the power system. The introduction of distributed power will have a certain impact on the power flow direction, voltage quality, power loss and reliability of the power system, especially in the direction of the flow direction, some distribution network relay protection devices are directional , after the trend reverses, the protection will lose its effect, and there may even be a risk of misoperation.

However, the embodiment of the present application can realize non-intrusive electrical quantity measurement under medium and low voltage working conditions. Through the integrated collection of electrical quantity data, the integrated measurement of electrical quantity can reflect the measurement data in the direction of the power flow, and the conductors to be tested can be completed separately. Calculation of frequency, phase, power, harmonics, and tidal current direction is economical, safe, and of great practical significance.

The electrical quantity integrated measurement device provided in the embodiment of the present application can be applied in the application environment shown in FIG. 1 . Wherein, the electrical quantity can be integrated into the measuring device 104 through a structure such as a buckle, and the caliper is placed on the power line 102 to be tested. Further, the power line 102 to be detected may include various types of power lines such as outgoing lines of a power distribution cabinet, incoming and outgoing lines of a transformer, and overhead lines. Exemplarily, the power line 102 to be tested may include a wire to be tested and an insulating layer. Optionally, the wire to be tested may be implemented using a charged conductor, and the insulating layer may be used to wrap the charged conductor; in some examples, the charged conductor may be Pure copper, steel cored aluminum stranded wire, copper wire, aluminum wire and other conductors.

In one embodiment, as shown in FIG. 2 , an integrated electrical measurement device is provided. Taking the device applied to the power line 102 to be tested shown in FIG. 1 as an example, the device may include:

The electric quantity integrated sensor arranged on the power line to be detected, the electric quantity integrated sensor includes a non-intrusive voltage measurement unit 202 and a non-intrusive current measurement unit 204; the non-intrusive voltage measurement unit 202 is used to obtain and output The current information of the wire to be tested; the non-invasive voltage measurement unit 204 is used to obtain and output the voltage information of the wire to be tested;

Signal processing unit 220, the signal processing unit 220 is connected to the electrical quantity integrated sensor; the signal processing unit 220 is used to receive and process current information and voltage information, obtain voltage and current waveform information, and process voltage and current waveform information to obtain the electrical quantity of the wire to be tested Measurement results; electrical measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results.

Specifically, the electrical quantity integrated sensor in the embodiment of the present application may refer to a sensor capable of non-invasively obtaining voltage information and current information of the wire to be tested, for example, a voltage probe and a current probe. In one of the embodiments, there is no electrical contact between the electrical quantity integrated sensor and the wire to be tested. Further, in one of the embodiments, the electrical quantity integrated sensor is used to clamp on the power line to be detected. For example, the electrical quantity integrated sensor can be clamped on the power line to be detected through a buckle or other structure.

As shown in Figure 2, the electrical quantity integrated sensor can include a non-invasive voltage measurement unit 202 and a non-invasive current measurement unit 204; the non-invasive voltage measurement unit 202 is used to obtain the current information of the wire to be tested; the non-invasive voltage measurement The unit 204 is used to obtain voltage information of the wire to be tested; in one embodiment, the current information may include a current measurement signal, and the voltage information may include a voltage measurement signal.

The signal processing unit 220 can be connected to an electrical quantity integrated sensor, and then can be used to receive voltage information and current information, and process to obtain current and voltage waveform information; further, the signal processing unit 220 can use a built-in algorithm (for example, through a built-in algorithm Floating point calculation) to calculate the electrical quantities such as current, voltage, frequency, phase, power, harmonics, and tidal current direction of the wire to be tested.

As mentioned above, the application completes the electrical quantity measurement of the wire to be tested through the electrical quantity integrated sensor and the signal processing unit arranged on the power line to be tested; wherein, the electrical quantity integrated sensor includes a non-invasive voltage measurement unit and a non-invasive current measurement unit The unit can obtain the current information and voltage information of the wire to be tested respectively, and then the signal processing unit can obtain the electrical quantity measurement result of the wire to be tested; Through the integrated collection of electrical quantity data, the measurement of the voltage, current, frequency, harmonic, phase, power, and power direction of the wire to be tested can be completed.

In one embodiment, as shown in FIG. 3 , an integrated electrical measurement device is provided. Taking the device applied to the power line 102 to be tested shown in FIG. 1 as an example, the device may include:

An electrical quantity integrated sensor set on the power line to be detected, the electrical quantity integrated sensor includes a non-invasive voltage measurement unit and a non-invasive current measurement unit; as shown in Figure 3, the non-invasive current measurement unit may include a current probe and a magnetic field Magnetic core; the magnetic core is provided with an air gap and set in the power line to be tested; the current probe is set in the air gap, and the current probe is used to sense the magnetic field change of the magnetic core to output the current measurement signal to the signal processing unit ; The non-intrusive voltage measurement unit may include a voltage probe, a reference voltage module, and a current-voltage conversion element connected in sequence; the voltage probe is used to form a coupling capacitance with the wire to be tested; the reference voltage module is used to output a reference signal; the current-voltage conversion One end of the element is used for grounding, and the other end of the current-voltage conversion element is used for outputting a voltage measurement signal to the signal processing unit;

A signal processing unit, the signal processing unit is connected to the electrical quantity integrated sensor; the signal processing unit is used to receive and process current information and voltage information, obtain voltage and current waveform information, and process voltage and current waveform information to obtain the electrical quantity measurement result of the wire to be tested; Electrical measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results;

Wherein, as shown in Figure 3, the signal processing unit may include a signal conditioning module, a signal sampling module, and a processing chip connected in sequence; the signal conditioning module is respectively connected to a current probe and a current-voltage conversion element for receiving current measurement signals and voltage measurement signals , and perform signal conditioning on the current measurement signal and voltage measurement signal, and output the conditioned measurement signal to the signal sampling module; the signal sampling module is used to sample the conditioned measurement signal, and output the voltage and current waveform information to the processing chip; the processing chip Connect the reference voltage module to adjust the reference signal output by the reference voltage module, and use corresponding algorithms to process voltage and current waveform information to obtain electrical quantity measurement results.

Specifically, in the non-intrusive current measurement unit, the magnetic core is provided with an air gap and is sleeved on the power line to be tested, which is used to collect the magnetic field generated by the current of the wire (charged conductor) to be tested, and at the same time suppress the intrusion of the outside world. disturbing magnetic field. Optionally, the magnetism-gathering core may be a ferrite core, a silicon steel sheet core, a permalloy core, an amorphous or nanocrystalline soft magnetic alloy core, etc., or other components with a magnetism-gathering function. Exemplarily, the shape of the magnetic flux gathering core may include a hollow structure composed of two semicircular rings or two "concave" shaped structures. Further, the position of the air gap may include a position between two semi-circular rings or two "concave" structures in contact with each other up and down.

In one embodiment, the current probe is a magnetic field sensitive element; specifically, the current probe in the embodiment of the present application may be a magnetic field sensitive element, which is arranged in an air gap for sensing a change in a magnetic field and outputting an electrical signal. Exemplarily, the current probe can be a tunnel magnetoresistance element (Tunnel Magnetoresistance, TMR), a Hall element, a Rogowski coil probe, a multilayer PCB (Printed Circuit Board, printed circuit board) coil probe, etc.; it should be noted that, Select different magnetic field sensitive components according to current measurement requirements.

In one of the embodiments, the current measurement signal includes the output voltage of the magnetic field sensitive element;

The electric quantity measurement result also includes the flow direction determined based on the current direction; the current direction is obtained based on the output voltage.

Specifically, the embodiment of the present application can obtain the power flow direction of the power system. In order to further explain the scheme of the present application, explain the current measurement principle of the wire to be tested; The current detection process of the charged conductor; it should be noted that, in order to illustrate the current measurement method in Figure 4, the irrelevant parts are hidden.

Because the magnetic flux gathering ring uses high magnetic permeability material, its magnetic permeability is far greater than that of air, so the magnetic flux gathering ring gathers most of the magnetic field generated by the conductor current inside the magnetic flux gathering ring. As shown in Figure 4, the magnetic core has an air gap, the length of the air gap is L _q , the actual effective total length of the magnetic core is L _f , assuming that the current flowing through the charged conductor is I, and the magnetic field strength in the magnetic core is H _f , the magnetic field strength in the air gap is H _q , it can be known from the Ampere loop theorem:

H _f L _f + H _q L _q =I

The magnetic induction intensity in the magnetic core is equal to the magnetic induction intensity in the air gap, which is abbreviated as B. The magnetic permeability of air is μ ₀ , and the relative magnetic permeability of the magnetic core is μ _r . Ampere's loop theorem can be expressed as:

Because the relative magnetic permeability μ _r of the magnetic core is much greater than 1, the Ampere loop theorem can be simplified as:

The magnetic induction intensity B in the air gap is proportional to the current I to be measured, and the output voltage of the TMR chip is proportional to the magnetic induction intensity B, and then the output voltage of the TMR chip and the current I to be measured are in a linear relationship.

Considering that the TMR chip has a definite sensitive axis direction, the direction of the current can be known from the output of the TMR, so that the direction of the power flow can be judged by the direction of the current.

Further, in the non-intrusive voltage measurement unit, the voltage probe may include a ring-shaped metal copper foil; specifically, the voltage probe may be a ring formed by pressing a layer of metal copper foil to form a coupling with a live conductor capacitance.

In one embodiment, the current-to-voltage conversion element may be a voltage dividing capacitor; the device further includes a ground probe connected to the voltage dividing capacitor.

Specifically, the voltage dividing capacitor is connected to the reference voltage module and the grounding probe, and is used to collect the displacement current of the voltage measurement circuit, which can be understood as a current-to-voltage conversion element in the voltage measurement circuit.

The ground probe is connected to the voltage dividing capacitor, which is used to provide a reliable zero potential reference for the voltage measurement circuit.

The reference voltage module can be connected with a voltage probe and a voltage dividing capacitor, controlled by a processing chip (for example, MCU, Microcontroller Unit, micro control unit), and used to inject reference signals of different frequencies into the voltage measurement circuit.

In this embodiment of the present application, the power flow direction of the power system can be obtained. In order to further explain the solution of the present application, the voltage measurement principle of the wire to be tested is explained; as shown in Fig. 5 and Fig. 6, the wire to be tested is taken as a charged conductor as an example. It should be noted that in FIG. 5 and FIG. 6 , in order to illustrate the voltage measurement method, irrelevant parts are omitted.

Take the voltage probe as an example of a ring formed by pressing a layer of metal copper foil. Since the charged conductor itself has a certain potential, it can generate induced charges on the metal copper foil through electrostatic coupling. In order to describe this effect, as shown in Figure 5 Shown, represented by coupling capacitor C1. As shown in Figure 6, it is a simplified circuit diagram for voltage measurement. C2 is a voltage dividing capacitor, which is used for sampling electrical signals during subsequent signal processing. The subsequent signal processing module is simplified as a voltmeter in the principle description, which means that it is used to process the voltage signal on the voltage dividing capacitor.

The ground probe clamps tightly to the grounded conductor, providing a reliable zero-potential reference for the entire measurement loop. For example, when measuring the voltage of the live wire in the power distribution cabinet, the grounding probe can clamp the cabinet body; when measuring the voltage of the low-voltage phase line, the grounding probe can clamp the neutral wire or the ground wire. The control reference voltage is injected at a frequency f _r different from the mains frequency. The amplitude of the measured power supply is U _s and the frequency is f _s . In the entire measurement circuit, the current flowing is I _s +I _r . According to the superposition theorem, we know that:

Further sorting can be obtained:

From this, the expression of U _s can be calculated as:

As shown in Figure 6, the voltage on C2 can be collected by subsequent circuits, and the voltage waveform collected on C2 is an aliased waveform (the aliased signal of two frequency waveforms), which can then be obtained by Fourier transform The power frequency measurement voltage V _s and the high frequency measurement voltage V _r are calculated by means of calculation. The current I _s +I _r in the loop can be calculated as:

For the expression of U _s , among them, I _s +I _r can be calculated; f _s and f _r are fixed, and U _r is predictable in advance, so it can be seen that the measured voltage can be obtained through the known quantity and the measured calculated.

As above, in the embodiment of the present application, the current and voltage of the wire to be tested can be calculated by using the current probe and the voltage probe.

Further, in one of the embodiments, the processing chip may include a single-chip microcomputer; the signal sampling module may include an analog-to-digital conversion chip; and the signal conditioning module is used for performing standard signal conversion on the current measurement signal and the voltage measurement signal.

Specifically, in the signal processing unit of the embodiment of the present application, the signal conditioning module can be connected to the current probe and the voltage dividing capacitor respectively, and is used to receive the output voltage signal of the current probe and the voltage signal of the voltage dividing capacitor, and process the voltage signal conditioning, and output the conditioned analog signal. Exemplarily, signal conditioning can be understood as a process of converting a received original analog signal into a standard signal, for example, signal conditioning can include debounce, filter, follow-up, amplification, phase shift correction, and the like. It should be noted that the signal conditioning module may include a voltage follower circuit, an active filter circuit, a passive filter circuit, an RC phase shift correction circuit, an active operational amplifier circuit, and the like.

The signal sampling module is connected with the signal conditioning module, and is used for sampling the conditioned measurement signal, and providing a digital signal for a back-end processing chip (for example, MCU). Exemplarily, the signal sampling module may include an analog-to-digital conversion chip.

The processing chip (for example, MCU) is connected to the signal sampling module, which is used to receive the current and voltage waveform information, and calculate the electrical quantities such as current, voltage, frequency, phase, power, harmonics, and direction of the wire to be tested through the built-in algorithm.

In one of the embodiments, the signal processing unit may further include a communication module connected to the processing chip, for outputting the electrical quantity measurement result.

In one embodiment, as shown in FIG. 7 , the communication module may include a Bluetooth chip and an antenna; the processing chip is connected to the antenna through the Bluetooth chip.

In one of the embodiments, the electrical quantity integrated measuring device may also include an energy harvesting device;

The energy-taking device is connected to the signal processing unit, and is used for taking power from the power line to be detected to supply power to the signal processing unit.

Specifically, the electrical quantity integrated measurement equipment can take power from the power line to be detected through the energy harvesting device to supply power to each device.

In one of the embodiments, as shown in Figure 8, the energy harvesting device may include:

The energy-taking magnetic core is sleeved on the power line to be tested;

The energy-taking coil is wound on the energy-taking magnetic core;

The protection module is connected to the energy-taking coil;

A power circuit, one end of the power circuit is connected to the protection module, and the other end of the power circuit is connected to the signal processing unit;

Backup battery, connected to the power circuit.

Specifically, as shown in FIG. 8 , the energy-taking magnetic core can be sleeved on the power line to be tested, so as to form a path for inducing an alternating magnetic field around the wire. Exemplarily, the energy-taking magnetic core may be a ferrite core, a silicon steel sheet core, a permalloy core, an amorphous or nanocrystalline soft magnetic alloy core, etc., or it may be other components with a magnetic gathering function. Optionally, in the embodiment of the present application, the shape of the magnetic gathering core may include a hollow structure composed of two semi-circular or two "concave" structures.

Furthermore, the energy harvesting coil can be wound on the energy harvesting magnetic core, and an alternating electromotive force is induced through an alternating magnetic field to provide induced electromotive force for subsequent modules. The size of the induced electromotive force is proportional to the size of the primary side current of the wire to be tested.

Exemplarily, the protection module is connected to the energy-taking coil, and is used for protection measures such as anti-DC pulse interference, anti-lightning strike, and anti-static of the electromotive force induced by the energy-taking coil. Optionally, the protection module may include a power supply anti-lightning strike, anti-static protection circuit, and the like.

In the embodiment of the present application, the power circuit can be respectively connected to the protection circuit and the backup battery for energy management of the induced electromotive force and the backup battery; optionally, the power circuit can include an induced electromotive force conversion circuit, a battery charging and discharging circuit, and the like.

Further, for the induced electromotive force provided by the induction coil, the induced electromotive force conversion circuit undergoes AC-DC rectification and transformation to obtain a DC power supply, and then performs DC-DC conversion on the obtained DC power supply, and finally obtains the stable DC power supply required by the electrical quantity integrated sensor . The battery charging and discharging circuit can be used for charging and discharging the backup battery. When the primary side current in the wire to be tested is large, the energy induced by the energy harvesting coil is large at this time, and the backup battery can be charged through the charging circuit. When the primary side current in the wire to be tested is small, the energy induced by the energy-taking coil is not enough to meet the needs of the sensor (device), and the backup battery is used to discharge the power supply for the device to ensure that the device can retain and complete the sampling data. transmission.

As mentioned above, the application can realize non-intrusive electrical quantity measurement under medium and low voltage working conditions, and complete the measurement of the voltage, current, frequency, harmonic, phase, power, and power direction of the tested conductor.

Those skilled in the art can understand that the structures shown in Figures 1 to 8 are only block diagrams of partial structures related to the solution of this application, and do not constitute a limitation on the equipment to which the solution of this application is applied. The specific equipment More or fewer components than shown in the figures may be included, or certain components may be combined, or have a different arrangement of components.

In one embodiment, as shown in FIG. 9 , a method for integrated measurement of electrical quantities is provided. The application of the method to the signal processing unit in the above-mentioned integrated measurement device for electrical quantities is used as an example for illustration, including the following steps:

Step 902, receiving current information and voltage information transmitted by the electrical quantity integrated sensor.

Step 904, process current information and voltage information to obtain voltage and current waveform information.

Step 906, process the voltage and current waveform information to obtain the electrical quantity measurement result of the wire to be tested. Wherein, the electrical quantity measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results; the power measurement results may include active power measurement results and reactive power measurement results.

Specifically, based on the above-mentioned integrated measurement equipment for electrical quantities, an embodiment of the present application also proposes an integrated measurement method for electrical quantities, which is applicable to integrated measurement of medium and low voltage electrical quantities.

Taking this method applied to the MCU in the signal processing unit of the above-mentioned electrical quantity integrated measurement device as an example, the following steps may be included: ①Clamp the electrical quantity integrated sensor to the measured wire; ②The electrical quantity integrated sensor starts the voltage probe and the current probe , non-invasively obtain the voltage waveform and current waveform information of the wire to be tested; ③MCU analyzes and processes the voltage and current signal waveform collected by the probe, and completes the frequency, phase, power, Calculation of harmonics, direction of flow. The application is economical and safe, and has great practical significance.

Further, the current and voltage of the wire to be tested can be calculated through the current probe and the voltage probe. On the basis of obtaining current and voltage waveforms, through related algorithms, electrical quantities such as frequency, harmonics, phase, active power and reactive power can be obtained. The specific process can be as follows:

Frequency measurement can directly sample the frequency of the voltage measurement signal through the MCU, and measure the zero-crossing point through the internal inherent line frequency parameters to measure the voltage frequency of the cable under test;

Harmonic measurement can be to send the current signal through the conditioning circuit to the MCU, and obtain the current component of the corresponding frequency after being processed by the Fourier transform algorithm, so as to realize the measurement of the cable harmonic;

Phase measurement can be through the current and voltage values read by the MCU through the algorithmic process of product and integral summation to finally obtain the active power value, and then calculate the phase angle through the trigonometric function relationship between apparent power and active power, and the algorithm determines the current and voltage quadrants later Determine the positive and negative of the phase angle, and finally correspond to the phase of the voltage;

The active power measurement can be the current and voltage values read by the MCU through the algorithm processing process of product, integration and summation to finally obtain the active power value;

The reactive power measurement can be obtained by calculating the corresponding phase angle relationship through the active power value obtained after the MCU algorithm processing, and then calculate the reactive power value through the trigonometric function relationship of active and reactive power.

It should be understood that although the steps in the flow charts involved in the above embodiments are shown sequentially according to the arrows, these steps are not necessarily executed sequentially in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least some of the steps in the flow charts involved in the above-mentioned embodiments may include multiple steps or stages, and these steps or stages are not necessarily executed at the same time, but may be performed at different times For execution, the execution order of these steps or stages is not necessarily performed sequentially, but may be executed in turn or alternately with other steps or at least a part of steps or stages in other steps.

Based on the same inventive concept, an embodiment of the present application further provides an integrated electrical quantity measurement device for implementing the above-mentioned integrated electrical quantity measurement method. The solution to the problem provided by the device is similar to the implementation described in the above method, so the specific limitations in one or more embodiments of the integrated electrical measurement device provided below can be referred to above for the integrated measurement of electrical quantities The limitation of the method will not be repeated here.

In one embodiment, an integrated measurement device for electrical quantities is provided. The application of the device to the signal processing unit in the above-mentioned integrated measurement equipment for electrical quantities is used as an example for illustration. The device may include:

The information receiving module is used to receive the current information and voltage information transmitted by the electrical quantity integrated sensor.

The waveform information processing module is used to process current information and voltage information to obtain voltage and current waveform information.

The measurement result acquisition module is used to process the voltage and current waveform information to obtain the electrical quantity measurement result of the wire to be tested. Wherein, the electrical quantity measurement results include frequency measurement results, harmonic measurement results, phase measurement results, and power measurement results; the power measurement results may include active power measurement results and reactive power measurement results.

Each module in the above-mentioned electrical quantity integrated measuring device can be fully or partially realized by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, and can also be stored in the memory of the computer device in the form of software, so that the processor can invoke and execute the corresponding operations of the above-mentioned modules.

In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above method for integrated electrical quantity measurement are realized.

In one embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps of the above method for integrated measurement of electrical quantities are implemented.

Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be implemented through computer programs to instruct related hardware, and the computer programs can be stored in a non-volatile computer-readable memory In the medium, when the computer program is executed, it may include the processes of the embodiments of the above-mentioned methods. Wherein, any references to storage, database or other media used in the various embodiments provided in the present application may include at least one of non-volatile and volatile storage. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive variable memory (ReRAM), magnetic variable memory (Magnetoresistive Random Access Memory (MRAM), Ferroelectric Random Access Memory (FRAM), Phase Change Memory (Phase Change Memory, PCM), graphene memory, etc. The volatile memory may include a random access memory (Random Access Memory, RAM) or an external cache memory and the like. As an illustration and not a limitation, the RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM). The databases involved in the various embodiments provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a blockchain-based distributed database, etc., but is not limited thereto. The processors involved in the various embodiments provided by this application can be general-purpose processors, central processing units, graphics processors, digital signal processors, programmable logic devices, data processing logic devices based on quantum computing, etc., and are not limited to this.

The technical features of the above embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, they should be It is considered to be within the range described in this specification.

The above-mentioned embodiments only express several implementation modes of the present application, and the description thereof is relatively specific and detailed, but should not be construed as limiting the patent scope of the present application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be determined by the appended claims.

Claims (10)

1. An electrical quantity integrated measuring device, characterized in that the device comprises:

the integrated sensor of the electric quantity is arranged on a power line to be detected, and comprises a non-invasive voltage measuring unit and a non-invasive current measuring unit; the non-invasive voltage measuring unit is used for acquiring and outputting current information of a wire to be detected in the power line to be detected; the non-invasive voltage measuring unit is used for acquiring and outputting voltage information of the wire to be measured;

the signal processing unit is connected with the electrical quantity integrated sensor; the signal processing unit is used for receiving and processing the current information and the voltage information to obtain voltage and current waveform information, and processing the voltage and current waveform information to obtain an electric quantity measurement result of the to-be-measured lead; the electrical quantity measurement results include a frequency measurement result, a harmonic measurement result, a phase measurement result, and a power measurement result.

2. The electrical quantity integrated measuring device according to claim 1, wherein there is no electrical contact between the electrical quantity integrated sensor and the conductor under test; the current information comprises a current measurement signal; the voltage information comprises a voltage measurement signal;

the non-invasive current measuring unit comprises a current probe and a magnetic gathering magnetic core; the magnetic gathering magnetic core is provided with an air gap and sleeved on the power line to be detected; the current probe is arranged in the air gap and used for inducing the magnetic field change of the magnetic gathering magnetic core so as to output the current measuring signal to the signal processing unit;

the non-invasive voltage measuring unit comprises a voltage probe, a reference voltage module and a current-voltage conversion element which are connected in sequence; the voltage probe is used for forming a coupling capacitor with the lead to be tested; the reference voltage module is used for outputting a reference signal; one end of the current-voltage conversion element is used for grounding, and the other end of the current-voltage conversion element is used for outputting the voltage measurement signal to the signal processing unit;

the signal processing unit comprises a signal conditioning module, a signal sampling module and a processing chip which are connected in sequence; the signal conditioning module is respectively connected with the current probe and the current-voltage conversion element, and is used for receiving the current measurement signal and the voltage measurement signal, performing signal conditioning on the current measurement signal and the voltage measurement signal, and outputting the conditioned measurement signal to the signal sampling module; the signal sampling module is used for sampling the conditioned measuring signal and outputting the voltage and current waveform information to the processing chip; the processing chip is connected with the reference voltage module and used for adjusting the reference signal output by the reference voltage module and processing the voltage and current waveform information by adopting a corresponding algorithm to obtain the electric quantity measuring result.

3. The electrical quantity integrated measuring device according to claim 2, wherein the electrical quantity integrated sensor is used to clamp on the power line to be detected; the voltage probe comprises a circular metal copper foil;

the current-voltage conversion element is a voltage division capacitor; the device also comprises a grounding probe connected with the voltage division capacitor.

4. The electrical quantity integrated measuring device according to claim 2, wherein the processing chip comprises a single-chip microcomputer; the signal sampling module comprises an analog-to-digital conversion chip; the signal conditioning module is used for performing standard signal conversion on the current measurement signal and the voltage measurement signal;

the signal processing unit further comprises a communication module connected with the processing chip and used for outputting the electric quantity measuring result.

5. The electrical quantity integrated measurement device of claim 4, wherein the signal conditioning module comprises one or more of a voltage follower circuit, an active filter circuit, a passive filter circuit, an RC phase shift correction circuit, and an active operational amplification circuit;

the communication module comprises a Bluetooth chip and an antenna; the processing chip is connected with the antenna through the Bluetooth chip.

6. The electrical quantity integrated measuring device according to claim 2, wherein the current probe is a magnetic field sensitive element; the current measurement signal comprises an output voltage of the magnetic field sensitive element;

the electrical quantity measurement result further comprises a current flow direction determined based on the current direction; the current direction is derived based on the output voltage.

7. The electrical quantity integrated measurement device according to claim 6, wherein the magnetic field sensitive element comprises any one of a tunnel magneto resistive element (TMR), a Hall element, a Rogowski coil probe, and a multi-layer PCB coil probe.

8. The integrated measurement device of electrical quantities according to any of claims 1 to 7, characterized in that the device further comprises energy extraction means;

the energy taking device is connected with the signal processing unit and used for taking electricity from the power line to be detected so as to supply power to the signal processing unit.

9. The electrical quantity integrated measuring device according to claim 8, wherein the energy extracting means comprises:

the energy-taking magnetic core is sleeved on the power line to be detected;

the energy taking coil is wound on the energy taking magnetic core;

the protection module is connected with the energy taking coil;

one end of the power supply circuit is connected with the protection module, and the other end of the power supply circuit is connected with the signal processing unit;

and the standby battery is connected with the power supply circuit.

10. An integrated measurement method of electrical quantities, characterized in that the method is applied to a signal processing unit in an integrated measurement device of electrical quantities according to any one of claims 1 to 9, the method comprising:

receiving the current information and the voltage information transmitted by the electrical quantity integration sensor;

processing the current information and the voltage information to obtain voltage and current waveform information;

processing the voltage and current waveform information to obtain an electric quantity measurement result of the lead to be measured; the electric quantity measuring result comprises a frequency measuring result, a harmonic measuring result, a phase measuring result and a power measuring result; the power measurement results comprise active power measurement results and reactive power measurement results.

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