Current sampling device and current sampling method

Abstract

The invention relates to a current sampling device and a current sampling method. The current sampling device comprises a sampling module, a control module and a calibration module. The sampling module comprises a magnetic conductive piece, a measuring coil and a sampling coil; the magnetic conduction piece comprises at least two magnetic conduction sections, the magnetic conduction sections are connected with each other and form an annular structure, and any two adjacent magnetic conduction sections are configured to be arranged in an openable and closable manner; the measuring coil and the sampling coil are both wound outside the magnetic conducting piece and are arranged in a way of avoiding from each other; the control module is configured to be used for controlling opening and closing of the two corresponding adjacent magnetic conduction sections. And the calibration module is configured to be used for respectively acquiring a measurement electric signal of the measurement coil and a sampling electric signal of the sampling coil, and performing calibration operation according to the measurement electric signal and the sampling electric signal. Measurement electric signals and sampling electric signals are respectively acquired through the measurement coil and the sampling coil, and the measurement electric signals and the sampling electric signals are calibrated by matching with the calibration module, so that the accuracy of a sampling result is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of current sampling devices, and particularly to a current sampling device and a current sampling method. Background Art

[0002] During the entire process of power production, transmission, and use, the measurement of electrical parameters in the power system provides necessary data support for the reliable operation of the entire power system. Electrical parameters such as voltage, current, and power are undoubtedly the most important electrical parameters in the entire power system, directly affecting power production and people's production and living. Among the measurements of many electrical parameters, synchronous sampling is particularly important. The synchronous error of sampling will directly affect the measurement results, and the timing of the sampling synchronization signal determines the measurement accuracy of the entire sampling system in the case of interruption of the synchronization signal.

[0003] Currently, the existing current sampling devices on the market usually adopt the method of centralized procurement and centralized verification for distribution and installation. After installation, due to reasons such as short power outage windows and large quantities, periodic verification is often not carried out. Moreover, after installation, due to the influence of electricity usage nature, installation environment, DC bias, power harmonics, etc., the current sampling device is prone to measurement inaccuracy. Summary of the Invention

[0004] Based on this, it is necessary to provide a current sampling device and a current sampling method for how to solve the above problems.

[0005] A current sampling device includes:

[0006] A sampling module, including a magnetic conductor, a measuring coil, and a sampling coil; the magnetic conductor includes at least two magnetic conduction segments, each magnetic conduction segment is connected to each other and configured to form an annular structure, and any two adjacent magnetic conduction segments are configured to be openable and closable; the measuring coil and the sampling coil are both wound outside the magnetic conductor, and the two are arranged to avoid each other;

[0007] A control module, which is connected to the magnetic conductor, and the control module is configured to control the opening and closing of two adjacent magnetic conduction segments;

[0008] A calibration module, which is electrically connected to the measuring coil and the sampling coil, and the calibration module is configured to respectively obtain the measured electrical signal of the measuring coil and the sampled electrical signal of the sampling coil, and perform a calibration operation according to the measured electrical signal and the sampled electrical signal.

[0009] In one embodiment, the sampling module further includes an insulating member, the insulating member covers the outside of the magnetic conductor, the measuring coil, and the sampling coil, and the insulating member is configured to open and close synchronously with two corresponding magnetic conduction segments;

[0010] Wherein, the control module is matingly connected to the insulating member, and the control module is configured to control the opening and closing of the insulating member, and synchronously drive the corresponding two magnetic conduction segments to open and close through the insulating member.

[0011] In one embodiment, the control module includes a control component, the control component is drivingly connected to the insulating member, and the control component is configured to control the opening and closing of the insulating member, and synchronously drive the corresponding two adjacent magnetic conduction segments to open and close through the insulating member.

[0012] In one embodiment, the control module further includes a pressure sensor and a position sensor. The pressure sensor and the position sensor are respectively matingly connected to two adjacent magnetic conduction segments that can correspondingly open and close. The pressure sensor is configured to obtain the pressure value when the corresponding two adjacent magnetic conduction segments are closed; the position sensor is configured to obtain the interval distance when the corresponding two adjacent magnetic conduction segments are open.

[0013] In one embodiment, a detection module is further included. The detection module is communicatively connected to the control module. The detection module is configured to obtain in real time the pressure value when two adjacent magnetic conduction segments are closed, and control the degree of closing of the two adjacent magnetic conduction segments according to the pressure value; and to obtain in real time the interval distance when two adjacent magnetic conduction segments are open, and control the degree of opening of the two adjacent magnetic conduction segments according to the interval distance.

[0014] In one embodiment, the control module further includes a housing. The housing is movably matingly connected to the insulating member. An installation cavity is formed in the housing. The control component is matingly connected in the installation cavity, and at least a part of the control component extends out of the installation cavity and is drivingly connected to the insulating member.

[0015] In one embodiment, a holding module is further included. The holding module is matingly connected to a side of the control module facing away from the sampling module.

[0016] A current sampling method for the current sampling device in the foregoing embodiments, characterized by including:

[0017] Controlling the opening and closing of the corresponding two adjacent magnetic conduction segments to clamp and connect the circuit to be sampled;

[0018] Obtaining in real time the measured electrical signal of the measurement coil and the sampled electrical signal of the sampling coil;

[0019] Compare the measured electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the relative measurement error and absolute measurement error between the measured electrical signal and the standard electrical signal;

[0020] Compare the sampled electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the relative sampling error and absolute sampling error between the sampled electrical signal and the standard electrical signal;

[0021] Compare the relative measurement error with the relative measurement error at factory, and compare the absolute measurement error with the absolute measurement error at factory, and obtain the measurement influence coefficient;

[0022] Compare the relative sampling error with the relative sampling error at factory, and compare the absolute sampling error with the absolute sampling error at factory, and obtain the sampling influence coefficient;

[0023] Derive the corrected measured electrical signal based on the measurement influence coefficient and the measured electrical signal, and derive the corrected sampled electrical signal based on the sampling influence coefficient and the sampled electrical signal.

[0024] In one embodiment, the step of controlling the opening and closing of two adjacent magnetic conduction segments further includes:

[0025] Obtain in real time the distance between two adjacent magnetic conduction segments when they are opened;

[0026] When the distance is equal to the preset distance, control two adjacent magnetic conduction segments to stop opening.

[0027] In one embodiment, the step of controlling the opening and closing of two adjacent magnetic conduction segments further includes:

[0028] Obtain in real time the pressure value when two adjacent magnetic conduction segments are closed;

[0029] When the pressure value is equal to the preset pressure value, control two adjacent magnetic conduction segments to stop closing.

[0030] In the above current sampling device and current sampling method, when the current sampling device is running, first, the control module needs to control two adjacent magnetic conduction segments to open, and move the current sampling device to make the circuit to be sampled located between the intervals where two adjacent magnetic conduction segments are opened, and then the control module controls two adjacent magnetic conduction segments to close until the circuit to be sampled is clamped. In this way, the magnetic conduction member can be connected to the circuit to be sampled, and the measuring coil and the sampling coil can respectively collect the measured electrical signal and the sampled electrical signal. Subsequently, the calibration module obtains the measured electrical signal of the measuring coil and the sampled electrical signal of the sampling coil, and the calibration module can perform calibration operations on the measured electrical signal and the sampled electrical signal to obtain accurate sampling results. Description of the Drawings

[0031] Figure 1 This is a schematic structural diagram of the current sampling device in the present application.

[0032] Figure 2 This is a schematic structural diagram of the sampling module in the present application.

[0033] Figure 3 This is a schematic cross-sectional structural diagram of the sampling module in the present application.

[0034] Figure 4 This is a schematic structural diagram of the assembly of the magnetic conductor, measurement coil and sampling coil in the present application.

[0035] Figure 5 This is a schematic structural diagram of the control module in the present application.

[0036] Figure 6 This is a schematic cross-sectional structural diagram of the control module in the present application.

[0037] Figure 7 This is a schematic structural diagram of the calibration module in the present application.

[0038] Figure 8 This is a schematic flowchart of the current sampling method in an embodiment of the present application.

[0039] Figure 9 This is a schematic flowchart of the current sampling method in another embodiment of the present application.

[0040] Figure 10 This is a schematic flowchart of the current sampling method in still another embodiment of the present application.

[0041] Reference Signs

[0042] Current sampling device 100;

[0043] Sampling module 10; magnetic conductor 101; magnetic conduction section 1011; measurement coil 102; sampling coil 103; insulating member 104;

[0044] Control module 11; housing 111; installation cavity 1111; control component 112;

[0045] Calibration module 12; holding module 13. Detailed Description of the Invention

[0046] To make the above objects, features, and advantages of the present application more apparent and understandable, the following provides a detailed description of the specific embodiments of the present application with reference to the accompanying drawings. A lot of specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0047] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0048] In addition, if terms such as "first" and "second" appear, these terms are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0049] In the present application, unless otherwise clearly defined and limited, if terms such as "install", "connect", "join", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] In this application, unless otherwise clearly specified and defined, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0052] During the entire process of power production, transmission and use, the measurement of electrical parameters of the power system provides necessary data support for the reliable operation of the entire power system. Electrical parameters such as voltage, current, and power are undoubtedly the most important electrical parameters of the entire power system, directly affecting power production and people's production and life. In the process of measuring many electrical parameters, synchronous sampling is particularly important. The synchronous error of sampling will directly affect the measurement result, and the timekeeping of the sampling synchronous signal determines the measurement accuracy of the entire sampling system in the case of synchronous signal interruption.

[0053] Currently, the existing current sampling device 100 on the market usually adopts the method of centralized procurement and centralized verification for distribution and installation. After installation, due to reasons such as short power outage windows and large quantities, periodic verification is often not carried out. And after installation, due to the influence of power consumption nature, installation environment, DC bias, power harmonics, etc., the current sampling device 100 is prone to measurement inaccuracy.

[0054] Based on the above considerations, to solve the above problems, please refer to Figure 1 , in one or more embodiments of the present application, a current sampling device 100 is provided. The measurement coil 102 and the sampling coil 103 are respectively used to collect the measurement electrical signal and the sampling electrical signal, and cooperate with the calibration module 12 to calibrate the measurement electrical signal and the sampling electrical signal, thereby ensuring the accuracy of the sampling result.

[0055] Specifically, please refer to Figures 1 to 7, in the present application, the current sampling device 100 includes a sampling module 10, a control module 11 and a calibration module 12. The sampling module 10 includes a magnetic conductor 101, a measuring coil 102 and a sampling coil 103; the magnetic conductor 101 includes at least two magnetic conduction segments 1011, each magnetic conduction segment 1011 is connected to each other and configured to form an annular structure, and any two adjacent magnetic conduction segments 1011 are configured to be openable and closable; the measuring coil 102 and the sampling coil 103 are both wound outside the magnetic conductor 101, and the two are arranged to avoid each other; the control module 11 is connected to the magnetic conductor 101, and the control module 11 is configured to control the opening and closing of two adjacent magnetic conduction segments 1011. The calibration module 12 is used to be electrically connected to the measuring coil 102 and the sampling coil 103, and the calibration module 12 is configured to respectively obtain the measured electrical signal of the measuring coil 102 and the sampled electrical signal of the sampling coil 103, and perform a calibration operation according to the measured electrical signal and the sampled electrical signal.

[0056] It can be understood that the control module 11 is mainly used to ensure the close contact between the magnetic conductor 101 and the circuit to be sampled, so as to reduce the magnetic resistance, reduce magnetic leakage and vibration, and at the same time improve the measurement accuracy and operation stability.

[0057] Specifically in the present application, when the current sampling device 100 is operating, first, it is necessary to control two adjacent magnetic conduction segments 1011 to open through the control module 11, and move the current sampling device 100 so that the circuit to be sampled is located between the intervals where two adjacent magnetic conduction segments 1011 are open, and then control two adjacent magnetic conduction segments 1011 to close through the control module 11 until the circuit to be sampled is clamped. In this way, the magnetic conductor 101 can be connected to the circuit to be sampled, and the measuring coil 102 and the sampling coil 103 can respectively collect the measured electrical signal and the sampled electrical signal. Subsequently, the calibration module 12 obtains the measured electrical signal of the measuring coil 102 and the sampled electrical signal of the sampling coil 103, and the calibration module 12 can perform a calibration operation on the measured electrical signal and the sampled electrical signal to obtain an accurate sampling result.

[0058] Among them, it should be further explained that in the present application, the specific steps for the calibration module 12 to perform a calibration operation on the measured electrical signal and the sampled electrical signal are as follows:

[0059] First, compare the measured electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the measured absolute error according to the difference between the two; compare the measured absolute error with the standard electrical signal of the circuit to be sampled, and obtain the measured relative error according to the ratio between the two. Similarly, for the sampled electrical signal and the standard electrical signal of the circuit to be sampled, obtain the sampled absolute error according to the difference between the two; compare the sampled absolute error with the standard electrical signal of the circuit to be sampled, and obtain the sampled relative error according to the ratio between the two.

[0060] Secondly, compare the relative measurement error with the relative factory measurement error, and the absolute measurement error with the absolute factory measurement error, and obtain the measurement influence coefficient; compare the relative sampling error with the relative factory sampling error, and the absolute sampling error with the absolute factory sampling error, and obtain the sampling influence coefficient.

[0061] Here, it should be explained that the relative factory measurement error and the absolute factory measurement error refer to the relative error and the absolute error when the measurement coil 102 of the current sampling device 100 performs electrical signal detection during factory production; similarly, the relative factory sampling error and the absolute factory sampling error refer to the relative error and the absolute error when the sampling coil 103 of the current sampling device 100 performs electrical signal detection during factory production. Therefore, the measurement influence coefficient can be understood as the misalignment rate of the measurement coil 102 of the current sampling device 100 due to long-term non-use or other factors after leaving the factory. Correspondingly, the sampling influence coefficient can be understood as the misalignment rate of the sampling coil 103 of the current sampling device 100 due to long-term non-use or other factors after leaving the factory.

[0062] Based on this, the last step of the calibration module 12 for calibrating the measurement electrical signal and the sampling electrical signal is: obtain the corrected measurement electrical signal according to the product of the measurement electrical signal and the measurement influence coefficient; obtain the corrected sampling electrical signal according to the product of the sampling electrical signal and the sampling influence coefficient. In this way, the corrected measurement electrical signal and the corrected sampling electrical signal are relatively accurate measurement results.

[0063] In the embodiments of the present application, please refer to Figures 2 to 4 , the specific number of the magnetic conduction segments 1011 is not limited. Exemplarily, the number of the magnetic conduction segments 1011 is two, and the two magnetic conduction segments 1011 are respectively in a semi-circular arc structure, and the two magnetic conduction segments 1011 are spliced together to jointly form a magnetic conductor 101 with an annular structure.

[0064] Furthermore, the specific material of the magnetic conductor 101 is not limited. It can be understood that in the current sampling device 100, the selection of the magnetic conductor 101 needs to comprehensively consider factors such as magnetic permeability, saturation magnetic flux density, loss, frequency characteristics, and cost to ensure the accuracy of the sampling result and the sampling efficiency.

[0065] Based on this, the materials that the magnetic conductor 101 can adopt include silicon steel, ferrite, amorphous alloy, and nanocrystalline alloy, etc. Among them, silicon steel has characteristics such as high saturation magnetic flux density, medium magnetic permeability, excellent performance at low frequencies, and low cost. Ferrite has low high-frequency loss, but low saturation magnetic flux density and moderate magnetic permeability. Amorphous alloy has characteristics such as high magnetic permeability, low loss, and good temperature stability. Nanocrystalline alloy combines the advantages of amorphous and crystalline states, with extremely high initial magnetic permeability and excellent high-frequency performance.

[0066] In the present application, the material of the magnetic conductor 101 can be selected according to actual needs. Exemplarily, the magnetic conductor 101 is made of a nanocrystalline alloy material with high magnetic permeability.

[0067] In some embodiments, please refer to Figure 2 and Figure 3 , the sampling module 10 further includes an insulating member 104, the insulating member 104 is coated on the outer sides of the magnetic conductor 101, the measuring coil 102 and the sampling coil 103, and the insulating member 104 is configured to open and close synchronously with two corresponding magnetic conductor segments 1011. Wherein, the control module 11 is connected to the insulating member 104, and the control module 11 is configured to control the opening and closing of the insulating member 104, and synchronously drive the two corresponding magnetic conductor segments 1011 to open and close through the insulating member 104.

[0068] It can be understood that, in the specific operation process of the current sampling device 100, first, the control module 11 needs to control the insulating member 104 to open, and the insulating member 104 can drive two corresponding adjacent magnetic conductor segments 1011 to open synchronously. Then, move the current sampling device 100 to make the circuit to be sampled located between the intervals where two corresponding adjacent magnetic conductor segments 1011 are open; thereafter, control the insulating member 104 to close through the control module 11, and drive two corresponding adjacent magnetic conductor segments 1011 to close through the insulating member 104 until the circuit to be sampled is clamped. In this way, the magnetic conductor 101 can be connected to the circuit to be sampled, and the measuring coil 102 and the sampling coil 103 can respectively collect the measured electrical signal and the sampled electrical signal.

[0069] In the present application, by providing the insulating member 104, the magnetic conductor 101 can be insulated to avoid current leakage and reduce potential safety hazards.

[0070] Furthermore, the specific material of the insulating member 104 is not limited. It can be understood that, in the current sampling device 100, the insulating member 104 is mainly used to isolate the conductive parts, prevent electrical breakdown and ensure the safe operation of the device, and its material needs to have high dielectric strength, heat resistance, mechanical stability and environmental adaptability.

[0071] Based on this, the materials that the insulating member 104 can adopt include epoxy resin, silicone rubber, polyester film, ceramics, etc. Among them, epoxy resin has characteristics such as high dielectric strength, excellent mechanical strength and chemical corrosion resistance, and can be cast molded to adapt to complex structures and has no bubbles after curing. Silicone rubber has characteristics such as good flexibility, strong weather resistance and strong hydrophobicity. Polyester film has characteristics such as being thin and having high dielectric strength. Ceramics have extremely high heat resistance, high dielectric strength and arc resistance, and ceramics have good thermal conductivity and are suitable for heat dissipation design.

[0072] In the present application, the material of the insulating member 104 can be selected according to actual needs. Exemplarily, the magnetic conductor 101 is made of epoxy resin material.

[0073] In some embodiments, referring to Figure 5 and Figure 6 , the control module 11 includes a control component 112. The control component 112 is drivingly connected to the insulating member 104, and the control component 112 is configured to control the opening and closing of the insulating member 104, and synchronously drive the opening and closing of two adjacent magnetic conduction segments 1011 corresponding thereto through the insulating member 104.

[0074] It can be understood that during the specific operation process of the current sampling device 100, first, it is necessary to control the insulating member 104 to open through the control component 112, and the insulating member 104 can drive two adjacent magnetic conduction segments 1011 corresponding thereto to open synchronously. Then, move the current sampling device 100 to make the circuit to be sampled located between the intervals where two adjacent magnetic conduction segments 1011 are open; thereafter, control the insulating member 104 to close through the control component 112, and drive two adjacent magnetic conduction segments 1011 corresponding thereto to close through the insulating member 104 until the circuit to be sampled is clamped. In this way, the magnetic conduction member 101 can be connected to the circuit to be sampled, and the measuring coil 102 and the sampling coil 103 can respectively collect the measuring electrical signal and the sampling electrical signal.

[0075] Further, referring to Figure 5 and Figure 6 , the control component 112 includes a motor (not shown in the figure) and a spring pressing unit (not shown in the figure). Among them, the motor is used to drive the insulating member 104 to open and close, and synchronously drive two adjacent magnetic conduction segments 1011 corresponding thereto to open and close through the insulating member 104. The spring pressing unit includes a spring, a pressing plate and a guide rod. The spring is installed between the pressing plate and the support frame, and the guide rod passes through the center of the spring to ensure that the pressure direction is perpendicular and stable. The spring pressing unit continuously applies pressure through the elastic deformation of the spring to compensate for the gap between the magnetic conduction member 101 and the circuit to be sampled caused by temperature change or mechanical vibration.

[0076] In some embodiments, the control module 11 further includes a pressure sensor (not shown in the figure) and a position sensor (not shown in the figure). The pressure sensor and the position sensor are respectively connected to two adjacent magnetic conduction segments 1011 that can be opened and closed correspondingly. The pressure sensor is configured to obtain the pressure value when two adjacent magnetic conduction segments 1011 corresponding thereto are closed to each other; the position sensor is configured to obtain the interval distance when two adjacent magnetic conduction segments 1011 corresponding thereto are opened to each other.

[0077] It can be understood that when two adjacent magnetic conduction segments 1011 are closed under the drive of the control module 11 and clamp the circuit to be sampled, the pressure sensor can obtain the pressure value when the two adjacent magnetic conduction segments 1011 are closed in real time. When the pressure value between the two adjacent magnetic conduction segments 1011 is too large and will damage the circuit to be sampled, it is convenient for the user to take corresponding operations in time to stop the two adjacent magnetic conduction segments 1011 from closing further.

[0078] Correspondingly, when two adjacent magnetic conduction segments 1011 are opened under the drive of the control module 11 to allow the circuit to be sampled to be placed in the interval where the two magnetic conduction segments 1011 are opened, the position sensor can obtain the interval distance when the two adjacent magnetic conduction segments 1011 are opened in real time. When the interval distance between the two adjacent magnetic conduction segments 1011 is too large and easily damages its own structure, or when the interval distance between the two adjacent magnetic conduction segments 1011 is large enough to allow the circuit to be sampled to be placed, it is convenient for the user to take corresponding operations in time to stop the two adjacent magnetic conduction segments 1011 from opening further.

[0079] In some embodiments, please refer to Figure 1 , the current sampling device 100 further includes a detection module (not shown in the figure). The detection module is communicatively connected to the control module 11 and is configured to obtain the pressure value when two adjacent magnetic conduction segments 1011 are closed in real time, and control the degree of closing of the two adjacent magnetic conduction segments 1011 according to the pressure value; and to obtain the interval distance when two adjacent magnetic conduction segments 1011 are opened in real time, and control the degree of opening of the two adjacent magnetic conduction segments 1011 according to the interval distance value.

[0080] It can be understood that the detection module can obtain the pressure value when two adjacent magnetic conduction segments 1011 are closed in real time, and can control the two adjacent magnetic conduction segments 1011 to stop closing further when the pressure value between the two adjacent magnetic conduction segments 1011 is too large and will damage the circuit to be sampled. The detection module can obtain the interval distance when two adjacent magnetic conduction segments 1011 are opened in real time, and can control the two adjacent magnetic conduction segments 1011 to stop opening further when the interval distance between the two adjacent magnetic conduction segments 1011 is too large and easily damages its own structure, or when the interval distance between the two adjacent magnetic conduction segments 1011 is large enough to allow the circuit to be sampled to be placed. In this way, the detection module, the pressure sensor and the position sensor cooperate with each other to ensure the normal operation and structural safety of the circuit to be sampled and the current sampling device 100.

[0081] In some embodiments, please refer to Figure 5 and Figure 6The control module 11 also includes a shell 111, which is movably connected to the insulating member 104. A mounting cavity 1111 is formed in the shell 111, and the control component 112 is matched in the mounting cavity 1111. The control component 112 at least partially extends out of the mounting cavity 1111 and is drivingly connected to the insulating member 104.

[0082] It is understandable that the housing 111 can protect the control component 112 to reduce the probability of the control component 112 being damaged due to collision with the outside world, which is beneficial to improving the service life of the product.

[0083] In some embodiments, see Figure 1 The current sampling device 100 further includes a holding module 13 , which is connected to a side of the control module 11 facing away from the sampling module 10 .

[0084] It is understandable that the holding module 13 can facilitate the user to hold the current sampling device 100 , so as to facilitate the user to move and use the current sampling device 100 , thereby improving the user experience.

[0085] See Figure 8 One or more embodiments of the present application provide a current sampling method, which is used in the current sampling device 100 in the aforementioned embodiment, and is characterized by comprising:

[0086] S10: Control the opening and closing of two adjacent magnetic permeability segments 1011 to clamp and connect the circuit to be sampled.

[0087] It is understood that when the current sampling device 100 is in operation, the control module 11 first controls the opening of two adjacent magnetic permeable segments 1011, then moves the current sampling device 100 so that the circuit to be sampled is located between the two adjacent magnetic permeable segments 1011. The control module 11 then controls the closing of the two adjacent magnetic permeable segments 1011 to clamp the circuit to be sampled. This allows the magnetic permeable member 101 to communicate with the circuit to be sampled, and the measuring coil 102 and sampling coil 103 to collect the measurement signal and the sampling signal, respectively.

[0088] S20: Acquire the measurement electrical signal of the measurement coil 102 and the sampling electrical signal of the sampling coil 103 in real time.

[0089] It is understandable that, in the current sampling device 100 provided in the embodiment of the present application, the measurement electrical signal of the measuring coil 102 and the sampling electrical signal of the sampling coil 103 are acquired through the calibration module 12 .

[0090] S30: Compare the measured electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the relative measurement error and the absolute measurement error between the measured electrical signal and the standard electrical signal.

[0091] S40: Compare the sampled electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the relative sampling error and absolute sampling error between the sampled electrical signal and the standard electrical signal.

[0092] S50: Compare the measurement relative error with the factory measurement relative error, and compare the measurement absolute error with the factory measurement absolute error, and obtain the measurement influence coefficient.

[0093] S60: Compare the sampling relative error with the factory sampling relative error, and compare the sampling absolute error with the factory sampling absolute error, and obtain the sampling influence coefficient.

[0094] S70: Obtain the corrected measurement electrical signal based on the measurement influence coefficient and the measurement electrical signal, and obtain the corrected sampled electrical signal based on the sampling influence coefficient and the sampled electrical signal.

[0095] It can be understood that after the calibration module 12 obtains the measurement electrical signal of the measurement coil 102 and the sampled electrical signal of the sampling coil 103, the calibration module 12 can perform calibration operations on the measurement electrical signal and the sampled electrical signal to obtain accurate sampling results.

[0096] Specifically, first, compare the measurement electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the measurement absolute error based on the difference between the two; compare the measurement absolute error with the standard electrical signal of the circuit to be sampled, and obtain the measurement relative error based on the ratio of the two. Similarly, for the sampled electrical signal and the standard electrical signal of the circuit to be sampled, obtain the sampling absolute error based on the difference between the two; compare the sampling absolute error with the standard electrical signal of the circuit to be sampled, and obtain the sampling relative error based on the ratio of the two.

[0097] Secondly, compare the measurement relative error with the factory measurement relative error, and compare the measurement absolute error with the factory measurement absolute error, and obtain the measurement influence coefficient; compare the sampling relative error with the factory sampling relative error, and compare the sampling absolute error with the factory sampling absolute error, and obtain the sampling influence coefficient.

[0098] Here, it needs to be explained that the factory measurement relative error and the factory measurement absolute error refer to the relative error and absolute error when the measurement coil 102 of the current sampling device 100 performs electrical signal detection during factory production; similarly, the factory sampling relative error and the factory sampling absolute error refer to the relative error and absolute error when the sampling coil 103 of the current sampling device 100 performs electrical signal detection during factory production. Therefore, the measurement influence coefficient can be understood as the misalignment rate of the measurement coil 102 of the current sampling device 100 due to long-term non-use or other factors after leaving the factory. Correspondingly, the sampling influence coefficient can be understood as the misalignment rate of the sampling coil 103 of the current sampling device 100 due to long-term non-use or other factors after leaving the factory.

[0099] Based on this, the last step of the calibration module 12 for calibrating the measured electrical signal and the sampled electrical signal is as follows: obtaining a corrected measured electrical signal according to the product of the measured electrical signal and the measurement influence coefficient; obtaining a corrected sampled electrical signal according to the product of the sampled electrical signal and the sampling quantity influence coefficient. Thus, the corrected measured electrical signal and the corrected sampled electrical signal are relatively accurate measurement results.

[0100] In some other embodiments, please refer to Figure 9 , the steps of controlling the opening and closing of two adjacent magnetic conduction segments 1011 further include:

[0101] S101: Obtain in real time the interval distance when two adjacent magnetic conduction segments 1011 are opened relative to each other;

[0102] S102: When the interval distance is equal to the preset interval distance, control two adjacent magnetic conduction segments 1011 to stop opening.

[0103] It can be understood that during the actual operation of the current sampling device 100 provided in the embodiments of the present application, first, it is necessary to control two adjacent magnetic conduction segments 1011 to open through the control module 11, and move the current sampling device 100 to place the circuit to be sampled between the intervals where two adjacent magnetic conduction segments 1011 are opened, so as to facilitate subsequent control of two adjacent magnetic conduction segments 1011 to close, so as to clamp and connect the circuit to be sampled.

[0104] Based on this, the present application obtains in real time the interval distance when two adjacent magnetic conduction segments 1011 are opened relative to each other through a position sensor, so that when the interval distance between two adjacent magnetic conduction segments 1011 is too large and likely to damage its own structure, or when the interval distance between two adjacent magnetic conduction segments 1011 is large enough to allow the circuit to be sampled to be placed, the detection module is used to control two adjacent magnetic conduction segments 1011 to stop opening further, so as to ensure the structural safety of the sampling device.

[0105] It should be noted that in the present application, the preset interval distance means that at this interval distance, the interval distance between two adjacent magnetic conduction segments 1011 is large enough to allow the circuit to be sampled to be placed, and / or at this interval distance, the interval distance between two adjacent magnetic conduction segments 1011 will not damage its own structure.

[0106] In still some other embodiments, please refer to Figure 10 , the steps of controlling the opening and closing of two adjacent magnetic conduction segments 1011 further include:

[0107] S103: Obtain in real time the pressure value when two adjacent magnetic conduction segments 1011 are closed relative to each other;

[0108] S104: When the pressure value is equal to the preset pressure value, control the closing of two adjacent magnetic conduction segments 1011 accordingly.

[0109] It can be understood that during the actual operation of the current sampling device 100 provided in the embodiment of the present application, first, the control module 11 needs to control two adjacent magnetic conduction segments 1011 to open, and move the current sampling device 100 to place the circuit to be sampled between the intervals where two adjacent magnetic conduction segments 1011 are open. Subsequently, control two adjacent magnetic conduction segments 1011 to close to clamp and connect the circuit to be sampled.

[0110] Based on this, the present application obtains the pressure value when two adjacent magnetic conduction segments 1011 close to each other in real time through a pressure sensor. When the pressure value between two adjacent magnetic conduction segments 1011 is too large and may damage the circuit to be sampled, the detection module is used to control two adjacent magnetic conduction segments 1011 to stop closing further, so as to ensure the structural safety of the sampling device and the circuit to be sampled.

[0111] It should be noted that in the present application, the preset pressure value means that at this pressure value, two adjacent magnetic conduction segments 1011 can clamp the circuit to be sampled without damaging the circuit to be sampled and its own structure.

[0112] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0113] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A current sampling device, characterized in that, include: The sampling module includes a magnetic permeable member, a measuring coil, and a sampling coil; the magnetic permeable member includes at least two magnetic permeable segments, each magnetic permeable segment is interconnected and configured to form a ring structure, and any two adjacent magnetic permeable segments are configured to be openable and closable; the measuring coil and the sampling coil are both wound outside the magnetic permeable member and are arranged to avoid each other; A control module is coupled to the magnetic guide member and configured to control the opening and closing of two adjacent magnetic guide segments; A calibration module is used to be electrically connected to the measuring coil and the sampling coil, and the calibration module is configured to respectively obtain the measuring electrical signal of the measuring coil and the sampling electrical signal of the sampling coil, and perform calibration operations according to the measuring electrical signal and the sampling electrical signal.

2. The current sampling device according to claim 1, wherein The sampling module further includes an insulating member, which is coated on the outside of the magnetic permeability member, the measuring coil and the sampling coil, and is configured to open and close synchronously with the corresponding two magnetic permeability segments; The control module is matched with the insulating member, and is configured to control the opening and closing of the insulating member, and synchronously drive the corresponding two magnetic permeability segments to open and close through the insulating member.

3. The current sampling device according to claim 2, wherein The control module includes a control component, which is drivingly connected to the insulating member and configured to control the opening and closing of the insulating member and synchronously drive the opening and closing of two adjacent magnetic permeability segments through the insulating member.

4. The current sampling device according to claim 3, wherein, The control module also includes a pressure sensor and a position sensor, and the pressure sensor and the position sensor are respectively connected to two adjacent magnetic conduction segments that can be opened and closed accordingly. The pressure sensor is configured to obtain the pressure value when the two adjacent magnetic conduction segments are closed together; the position sensor is configured to obtain the spacing distance when the two adjacent magnetic conduction segments are opened to each other.

5. The current sampling device according to claim 4, wherein It also includes a detection module, which is communicatively connected to the control module. The detection module is configured to obtain in real time the pressure value of two adjacent magnetic conduction segments when they are closed together, and control the degree to which the two adjacent magnetic conduction segments are closed together according to the pressure value; and to obtain in real time the spacing distance between two adjacent magnetic conduction segments when they are opened together, and control the degree to which the two adjacent magnetic conduction segments are opened together according to the spacing distance.

6. The current sampling device according to claim 3, wherein The control module also includes a shell, which is movably connected to the insulating member. A mounting cavity is formed in the shell, and the control component is mounted in the mounting cavity. The control component at least partially extends out of the mounting cavity and is drivingly connected to the insulating member.

7. The current sampling device according to claim 1, wherein It also includes a holding module, which is connected to a side of the control module away from the sampling module.

8. A current sampling method for the current sampling device described in any one of claims 1 to 7, characterized in that, include: Controlling the opening and closing of two adjacent magnetic permeability segments to clamp and connect the circuit to be sampled; Acquiring the measurement electrical signal of the measuring coil and the sampling electrical signal of the sampling coil in real time; Comparing the measured electrical signal with a standard electrical signal of the circuit to be sampled, and obtaining a relative measurement error and an absolute measurement error between the measured electrical signal and the standard electrical signal; Compare the sampled electrical signal with the standard electrical signal of the circuit to be sampled, and obtain the sampling relative error and sampling absolute error between the sampled electrical signal and the standard electrical signal; Compare the measurement relative error with the relative error at factory measurement, and compare the measurement absolute error with the absolute error at factory measurement, and obtain the measurement influence coefficient; Compare the sampling relative error with the relative error at factory sampling, and compare the sampling absolute error with the absolute error at factory sampling, and obtain the sampling influence coefficient; Obtain the corrected measurement electrical signal based on the measurement influence coefficient and the measurement electrical signal, and obtain the corrected sampled electrical signal based on the sampling influence coefficient and the sampled electrical signal.

9. The current sampling method according to claim 8, wherein, The step of controlling the opening and closing of two adjacent magnetic conduction segments further includes: Real-time obtain the spacing distance when two adjacent magnetic conduction segments open relative to each other; When the spacing distance is equal to the preset spacing distance, control two adjacent magnetic conduction segments to stop opening.

10. The current sampling method according to claim 8, wherein The step of controlling the opening and closing of two adjacent magnetic conduction segments further includes: Real-time obtain the pressure value when two adjacent magnetic conduction segments close relative to each other; When the pressure value is equal to the preset pressure value, control two adjacent magnetic conduction segments to stop closing.

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