Device and method for testing reliability of power sensor

Abstract

The invention provides a device and method for testing the reliability of a power sensor, and the device comprises a magnetic field generation unit which is used for providing an alternating current for a Helmholtz coil through a power frequency current source, and generating a controllable magnetic field; the electric field generating unit is used for providing a high-voltage direct current or power frequency alternating current power supply for the parallel-plate capacitor through a high-voltage generator to generate a uniform electric field; the tested unit is used for providing a standard excitation signal through a standard source matched with the to-be-tested sensor, simulating an input condition of the to-be-tested sensor under an actual working condition and collecting output data of the to-be-tested sensor; and the control unit is used for setting test parameters, generating a control instruction according to the test parameters and generating a test result according to the output data. According to the device and the method, by simulating a strong magnetic field and a strong electric field environment and combining application of various measured parameters and an automatic control system, the reliability evaluation requirement of the sensor under the actual working condition is fully met.

Description

Technical Field

[0001] The present invention relates to the technical field of power equipment testing, and more specifically, to a device and method for testing the reliability of power sensors. Background Art

[0002] With the continuous expansion and complexity of the power system scale, power sensors, as key measurement and monitoring devices in the power system, play an important role in the acquisition and transmission of parameters such as voltage, current, and temperature.

[0003] Power sensors are embedded monitoring devices integrating sensing + computing + communication, specifically used for real-time perception and diagnosis of the operating status of high-voltage power equipment (≥35kV). Power sensors have realized the transformation of high-voltage equipment status monitoring from "passive response" to "active prevention". Typical applications can reduce the equipment failure rate by 40%-60% and reduce the operation and maintenance cost by more than 30%. They are important sensing terminals for building a new power system. Typical power sensors include: transformer status monitoring (diagnosing internal faults through dissolved gas analysis in oil, core grounding current detection, and vibration and acoustic fingerprint analysis), GIS equipment monitoring (real-time tracking of SF6 gas density, ultra-high frequency partial discharge location, and mechanical action characteristics), arrester health assessment (accurately measuring resistive current and temperature field distribution), and on-line monitoring of transmission lines (warning anomalies by combining temperature rise, vibration, and electrical stress data). Their multi-parameter fusion perception ability can significantly improve the operation safety and condition-based maintenance efficiency of high-voltage equipment, and support the digital operation and maintenance system of the smart grid.

[0004] However, during the operation of the power system, electrical equipment often needs to work in a complex environment of high-voltage electric fields and strong magnetic fields. This complex environment may cause the performance of power sensors to deteriorate or even fail, thus affecting the safety and reliability of the power system. Therefore, conducting reliability tests on power sensors in a high-voltage and strong magnetic field composite environment has become an important technical requirement for ensuring the safe operation of the power system.

[0005] However, currently, most common sensor reliability test devices are single-environment (high voltage or strong magnetic field) test devices, which cannot simultaneously simulate and control the composite environment of high-voltage electric fields and strong magnetic fields to achieve the working conditions of simulating the installation and operation of power sensors near high-voltage equipment. Therefore, existing test methods are difficult to meet the reliability evaluation requirements of sensors under actual working conditions. Summary of the Invention

[0006] In order to solve the technical problems in the prior art that there is a lack of effective means for testing the reliability of sensors in a high-voltage and strong magnetic field composite environment and it is difficult to meet the reliability evaluation requirements of sensors under actual working conditions, the present invention provides a device and method for testing the reliability of power sensors.

[0007] According to one aspect of the present invention, the present invention provides a device for testing the reliability of a power sensor, including:

[0008] A magnetic field generating unit, configured to provide an alternating current to a Helmholtz coil through a power frequency current source, so as to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment in which the sensor to be tested is located during the working state. Wherein, the frequency and amplitude of the alternating current are determined according to the control instructions output by the control unit;

[0009] An electric field generating unit, configured to provide a high-voltage direct current or a power frequency alternating current power supply to a parallel plate capacitor through a high-voltage generator, so as to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment in which the sensor to be tested is located during the working state. Wherein, the output voltage of the high-voltage generator is determined according to the control instructions output by the control unit;

[0010] A unit under test, configured to provide a standard excitation signal to the sensor to be tested through a standard source matching the sensor to be tested, so as to simulate the input conditions of the sensor to be tested under actual working conditions by using the standard excitation signal, and transmit the output data generated by the sensor to be tested based on the input conditions to the control unit through a data acquisition module. Wherein, the standard value of the standard excitation signal is determined according to the control instructions output by the control unit;

[0011] A control unit, configured to set test parameters, generate control instructions according to the test parameters, and transmit the control instructions to the magnetic field generating unit, the electric field generating unit, and the unit under test, and generate a test result according to the output data. Wherein, the test parameters include the target electric field strength, the target magnetic field strength, the frequency of the alternating current, and the standard value of the standard excitation signal.

[0012] Optionally, the Helmholtz coil is made of a non-conductive material and is placed inside the parallel plate capacitor; the Helmholtz coil includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coil. The parallel plate capacitor is composed of two circular parallel metal plates with a constant distance, and the sensor to be tested is placed in the center of the Helmholtz coil and connected to the standard source.

[0013] Optionally, the magnetic field generating unit further includes a magnetometer for measuring the real-time magnetic field strength generated by the Helmholtz coil, and the electric field generating unit further includes a field strength meter for measuring the real-time electric field strength between the parallel plate capacitors. Wherein, the real-time magnetic field strength and the real-time electric field strength are transmitted to the control unit.

[0014] Optionally, the unit under test further includes a fixing fixture for fixing the sensor to be tested.

[0015] Optionally, the control unit includes:

[0016] A human - machine interaction interface for setting test parameters and displaying the output data and test results;

[0017] An industrial control computer for generating control instructions according to the test parameters and generating test results according to the output data;

[0018] A communication module for data transmission between the industrial control computer and the magnetic field generating unit, the electric field generating unit, and the unit under test.

[0019] Optionally, the industrial control computer generates control instructions according to the test parameters and generates test results according to the output data, including:

[0020] Calculating the amplitude I of the alternating current that the magnetic field generating unit is intended to provide according to the target magnetic field strength, and its calculation formula is:

[0021]

[0022] In the formula, r and N are respectively the radius and the number of turns of the Helmholtz coil, B is the target magnetic field strength, and μ0 is the vacuum constant;

[0023] Calculating the voltage V that the electric field generating unit is intended to output according to the target electric field strength, and its calculation formula is:

[0024] V = E * D

[0025] In the formula, E is the diameter of the circular parallel metal plate, and D is the distance between the circular parallel metal plates;

[0026] Generating a control instruction for controlling the magnetic field generating unit to generate a controllable magnetic field according to the set frequency of the alternating current and the amplitude of the alternating current to be provided, generating a control instruction for controlling the electric field generating unit to generate a uniform electric field according to the voltage to be output, and generating a control instruction for the standard source to generate a standard excitation signal according to the set standard value;

[0027] Generating test results according to the output data, where:

[0028] When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is unreliable.

[0029] Optionally, the control unit is further configured to generate a control instruction and transmit it to the magnetic field generating unit when the real - time magnetic field strength is not less than the custom magnetic field strength threshold and / or the real - time electric field strength is not less than the custom electric field strength threshold, and control the high - voltage generator air switch to disconnect.

[0030] Optionally, the control unit is further configured to perform closed-loop control on the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field intensity and the target magnetic field intensity, so that the real-time magnetic field intensity is equal to the target magnetic field intensity, and perform closed-loop control on the voltage to be output by the high-voltage generator according to the absolute error between the real-time electric field intensity and the target electric field intensity, so that the real-time electric field intensity is equal to the target electric field intensity.

[0031] According to another aspect of the present invention, the present invention provides a method for testing the reliability of a power sensor, the method comprising:

[0032] Setting test parameters, wherein the test parameters include a target electric field intensity, a target magnetic field intensity, the frequency of the alternating current, and the standard value of the standard excitation signal;

[0033] Generating a control instruction according to the test parameters;

[0034] Providing an alternating current to a Helmholtz coil through a power frequency current source, so as to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment in which the sensor to be tested is located during the working state, wherein the frequency and amplitude of the alternating current are determined according to the control instruction;

[0035] Providing a high-voltage direct current or a power frequency alternating current power supply to a parallel plate capacitor through a high-voltage generator, so as to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment in which the sensor to be tested is located during the working state, wherein the output voltage of the high-voltage generator is determined according to the control instruction;

[0036] Providing a standard excitation signal to the sensor to be tested through a standard source matching the sensor to be tested, so as to simulate the input conditions of the sensor to be tested under actual working conditions by using the standard excitation signal, and collecting the output data generated by the sensor to be tested based on the input conditions through a data acquisition module, wherein the standard value of the standard excitation signal is determined according to the control instruction;

[0037] Generating a test result according to the output data.

[0038] Optionally, before setting the test parameters, it further includes:

[0039] Placing the Helmholtz coil inside the parallel plate capacitor, wherein the Helmholtz coil is made of a non-conductive material, includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coil, and the parallel plate capacitor is composed of two circular parallel metal plates with a constant distance;

[0040] Placing the sensor to be tested at the center of the Helmholtz coil and connecting it to the standard source.

[0041] Optionally, before setting the test parameters, it also includes fixing the sensor to be tested using a fixed tooling.

[0042] Optionally, generating a control instruction according to the test parameter includes:

[0043] Calculating the amplitude I of the alternating current to be provided according to the target magnetic field strength, and its calculation formula is:

[0044]

[0045] In the formula, r and N are respectively the radius and the number of turns of the Helmholtz coil, B is the target magnetic field strength, and μ0 is the vacuum constant;

[0046] Calculating the voltage v to be output according to the target electric field strength, and its calculation formula is:

[0047] V = E * D

[0048] In the formula, E is the diameter of the circular parallel metal plate, and D is the distance between the circular parallel metal plates;

[0049] Generating a control instruction for generating a controllable magnetic field according to the set frequency of the alternating current and the amplitude of the alternating current to be provided, generating a control instruction for generating a uniform electric field according to the voltage to be output, and generating a control instruction for the standard source to generate a standard excitation signal according to the set standard value.

[0050] Optionally, the generating the test result according to the output data includes:

[0051] When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is reliable.

[0052] Optionally, the method further includes measuring the real-time magnetic field strength generated by the Helmholtz coil and the real-time electric field strength between the parallel plate capacitors, and generating a control instruction to be transmitted to the magnetic field generating unit and controlling the high voltage generator circuit breaker to disconnect when the real-time magnetic field strength is not less than the custom magnetic field strength threshold or the real-time electric field strength is not less than the custom electric field strength threshold.

[0053] Optionally, the method further includes closed-loop controlling the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field strength and the target magnetic field strength, so that the real-time magnetic field strength is equal to the target magnetic field strength, and closed-loop controlling the voltage to be output by the high voltage generator according to the absolute error between the real-time electric field strength and the target electric field strength, so that the real-time electric field strength is equal to the target electric field strength.

[0054] According to another aspect of the present invention, there is provided a computer-readable storage medium storing a computer program for executing the method described in any of the above aspects of the present invention.

[0055] According to another aspect of the present invention, there is provided an electronic device including: a processor; a memory for storing executable instructions executable by the processor; and the processor for reading the executable instructions from the memory and executing the instructions to implement the method described in any of the above aspects of the present invention.

[0056] The device and method for testing the reliability of a power sensor according to the present invention, the device includes a magnetic field generating unit for providing an alternating current to a Helmholtz coil through a power frequency current source to generate a controllable magnetic field; an electric field generating unit for providing a high-voltage direct current or a power frequency alternating current power supply to a parallel plate capacitor through a high-voltage generator to generate a uniform electric field; a unit under test for providing a standard excitation signal through a standard source matching the sensor to be tested, simulating the input conditions of the sensor to be tested under actual working conditions, and transmitting the output data of the sensor to be tested to a control unit; and a control unit for setting test parameters, generating control instructions according to the test parameters, and transmitting the control instructions to the magnetic field generating unit, the electric field generating unit and the unit under test, and generating a test result according to the output data. The device and method comprehensively solve the problems existing in sensor testing, such as unrealistic experimental conditions, limited test range, and insufficient evaluation of long-term operation stability, by simulating a strong magnetic field and strong electric field environment, combined with the application of various test parameters and an automated control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The exemplary embodiments of the present invention can be more fully understood by referring to the following drawings:

[0058] Figure 1 FIG. is a schematic structural diagram of a device for testing the reliability of a power sensor according to a preferred embodiment of the present invention;

[0059] Figure 2 FIG. is a schematic structural diagram of a device for testing the reliability of a power sensor according to another preferred embodiment of the present invention;

[0060] Figure 3 FIG. is a flowchart of a method for testing the reliability of a power sensor according to a preferred embodiment of the present invention;

[0061] Figure 4 FIG. is a schematic structural diagram of an electronic device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0062] Reference is now made to the accompanying drawings to describe exemplary embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely, and to fully convey the scope of the present invention to those skilled in the art. The terms in the exemplary embodiments shown in the drawings are not intended to limit the present invention. In the drawings, the same units / components are denoted by the same reference numerals.

[0063] Unless otherwise specified, the terms used herein (including scientific and technical terms) have the ordinary meaning understood by those skilled in the art. In addition, it can be understood that the terms defined in the commonly used dictionary should be understood to have a meaning consistent with the context of their related fields, and should not be understood as idealized or overly formal meanings.

[0064] Exemplary device

[0065] Figure 1 It is a schematic structural diagram of a device for testing the reliability of a power sensor according to a preferred embodiment of the present invention. As Figure 1 shown, the device for testing the reliability of the power sensor described in this preferred embodiment includes:

[0066] A magnetic field generating unit 101, configured to provide an alternating current for a Helmholtz coil through a power frequency current source, so as to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment in which the sensor to be tested is located during the working state. Wherein, the frequency and amplitude of the alternating current are determined according to the control instruction output by the control unit;

[0067] Preferably, the Helmholtz coil is made of a non-conductive material and is placed inside a parallel plate capacitor; the Helmholtz coil includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coil. The parallel plate capacitor is composed of two circular parallel metal plates with a constant distance. The sensor to be tested is placed at the center of the Helmholtz coil and is connected to the standard source.

[0068] The principle of generating a magnetic field by a Helmholtz coil is that when an electric current passes through two parallel and coaxial coils, a relatively uniform magnetic field can be generated in the central region between the two coils, and the distance between the coils is equal to the radius of the coil. For two coils (coil 1 and coil 2), when the number of turns of the coil is N, the radius is r, and the coil spacing between coil 1 and coil 2 is d. According to the Helmholtz coil principle, r = d. Therefore, the magnetic field strength formula at the center point of the Helmholtz coil is:

[0069]

[0070] wherein, μ0 is the vacuum constant, μ0 = 4π×10-7 T·m / A.

[0071] After setting the target magnetic field intensity, the amplitude of the alternating current that the power frequency current source needs to output can be calculated according to the above magnetic field intensity formula at the center point of the Helmholtz coil. A control command is generated based on the set frequency of the alternating current (such as 50 Hz / 60 Hz) and the calculated amplitude of the alternating current and sent to the power frequency current source to make it generate the corresponding alternating current, thereby generating a magnetic field with the target magnetic field intensity. Further, the power frequency current source may also have a phase control function, capable of realizing synchronous triggering of the magnetic field generating unit and the electric field generating unit.

[0072] The electric field generating unit 102 is configured to provide a high-voltage direct current or a power frequency alternating current power supply for the parallel plate capacitor through a high-voltage generator, so as to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment where the sensor to be tested is located during the working state. Wherein, the output voltage of the high-voltage generator is determined according to the control command output by the control unit.

[0073] The parallel plate capacitor described in this preferred embodiment is composed of two parallel and opposite conductor plates, usually made of metal and separated by an insulating dielectric material (such as air, ceramic or plastic). When a voltage is applied between the two conductor plates, charges will accumulate on the surface area of the plates. According to Coulomb's law, a charged object will generate an electric field in the surrounding space. In a parallel plate capacitor, the charges on each plate generate an electric field perpendicular to the plate surface. For the plate with positive charges, the electric field radiates outward from the plate; for the plate with negative charges, the electric field converges towards the plate. The electric field lines between the two plates overlap with each other to form a uniform electric field. When a voltage V is applied between the two electrodes, charges Q will accumulate on the electrodes. According to Coulomb's law, the charge distribution will generate an electric field E around them. For a parallel plate capacitor, the electric field is uniform between the plates and perpendicular to the plate surface, and can be expressed by the following formula:

[0074]

[0075] In the formula, D is the distance between the two parallel plates.

[0076] Therefore, the voltage solution formula when the target electric field intensity is known can be derived from the above formula as:

[0077] V = E * D

[0078] Preferably, the magnetic field generating unit further includes a magnetometer for measuring the real-time magnetic field intensity generated by the Helmholtz coil, and the electric field generating unit further includes an electric field strength meter for measuring the real-time electric field intensity between the parallel plate capacitors, wherein the real-time magnetic field intensity and the real-time electric field intensity are transmitted to the control unit.

[0079] In this preferred embodiment, the magnetometer probe can be placed near the center of the Helmholtz coil, and the measured real-time magnetic field intensity is fed back to the control unit to ensure that, according to the control instructions of the control unit, the magnetic field generating unit generates a corresponding controllable magnetic field. Further, the control unit can also perform closed-loop control such as PID control based on the comparison between the real-time magnetic field intensity and the target magnetic field intensity, so as to generate a controllable magnetic field more precisely. The field strength meter probe can also be placed near the center of the Helmholtz coil, and the measured real-time electric field intensity is fed back to the control unit to ensure that, according to the control instructions of the control unit, the electric field generating unit generates a corresponding uniform electric field. Further, the control unit can also perform closed-loop control such as PID control based on the comparison between the real-time electric field intensity and the target electric field intensity, so as to generate a uniform electric field more precisely.

[0080] The unit under test 103 is configured to provide a standard excitation signal for the sensor under test through a standard source that matches the sensor under test, so as to use the standard excitation signal to simulate the input conditions of the sensor under test under actual working conditions, and transmit the output data generated by the sensor under test based on the input conditions to the control unit through the data acquisition module, wherein the standard value of the standard excitation signal is determined according to the control instructions output by the control unit.

[0081] The standard source in this preferred embodiment is not unique and needs to match the sensor under test. For example, when the sensor under test is a current sensor, the standard source is a high-precision current source, and when the sensor under test is a voltage sensor, the standard source correspondingly changes to a high-precision voltage source.

[0082] Preferably, the unit under test further includes a fixing fixture for fixing the sensor under test.

[0083] In this preferred embodiment, a fixing fixture is used to fix the sensor under test, such as a current sensor, an electric field sensor, etc., so as to ensure its stable position during the test and reduce external interference.

[0084] The control unit 104 is configured to set test parameters, generate control instructions according to the test parameters, and transmit the control instructions to the magnetic field generating unit, the electric field generating unit, and the unit under test, and generate test results according to the output data, wherein the test parameters include the target electric field intensity, the target magnetic field intensity, the frequency of the alternating current, and the standard value of the standard excitation signal.

[0085] Preferably, the control unit includes:

[0086] A human-machine interaction interface for setting test parameters and displaying the output data and test results;

[0087] An industrial control computer is used to generate control instructions according to the test parameters and generate test results according to the output data;

[0088] A communication module is used to transmit data between the industrial control computer, the magnetic field generating unit, the electric field generating unit, and the unit under test.

[0089] In this preferred embodiment, by providing a human-machine interface, it is possible to support the automated operation and monitoring of the test process.

[0090] Figure 2 It is a schematic structural diagram of a device for testing the reliability of a power sensor according to another preferred embodiment of the present invention. As Figure 2 shown, the device described in this preferred embodiment includes a magnetic field generating unit, an electric field generating unit, a unit under test, and a control unit. Among them, the magnetic field generating unit is composed of a Helmholtz coil 2011, a power frequency current source 2012, and a magnetometer 2013. The electric field generating unit is composed of a parallel plate capacitor 2021, a high voltage generator 2022, and an electric field strength meter 2023. The unit under test includes a standard source 2031, a sensor to be tested, and a fixing fixture (the sensor to be tested and the fixing fixture are not shown in the figure). The control unit includes a human-machine interface 2041, a communication module 2042, and an industrial control computer (the industrial control computer is not shown in the figure). It can be seen from Figure 2 this that the sensor to be tested connected to the standard source 2031 is placed at the center of the Helmholtz coil 2011, the magnetometer 2013 and the electric field strength meter 2023 are both placed near the Helmholtz coil 2011, and the Helmholtz coil 2011 is placed between the upper and lower plates of the parallel plate capacitor 2021.

[0091] Preferably, the industrial control computer generates control instructions according to the test parameters and generates test results according to the output data, including:

[0092] Calculating the amplitude I of the alternating current that the magnetic field generating unit is intended to provide according to the target magnetic field strength, and its calculation formula is:

[0093]

[0094] In the formula, r and N are the radius and the number of turns of the Helmholtz coil respectively, B is the target magnetic field strength, and μ0 is the vacuum constant;

[0095] Calculating the voltage C that the electric field generating unit is intended to output according to the target electric field strength, and its calculation formula is:

[0096] V = E * D

[0097] In the formula, E is the diameter of the circular parallel metal plate, and D is the distance between the circular parallel metal plates;

[0098] Generate a control instruction for the magnetic field generation unit to generate a controllable magnetic field according to the set frequency of the alternating current and the amplitude of the alternating current to be provided, generate a control instruction for the electric field generation unit to generate a uniform electric field according to the voltage to be output, and generate a control instruction for the standard source to generate a standard excitation signal according to the set standard value;

[0099] Generate a test result according to the output data, where:

[0100] When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is unreliable.

[0101] In this preferred embodiment, a Helmholtz coil is designed with a radius r = 0.5 m, a spacing d = r (meeting the Helmholtz condition), and the number of turns of the coil N = 150 turns (the cross-sectional area of the copper wire is 6 mm 2 , with a water-cooling channel), and the structure is a non-magnetic support frame (material: fiberglass, dielectric strength ≥ 20 kV / mm). When a magnetic field of 3 mT needs to be generated, the required current can be calculated according to the formula:

[0102]

[0103] Furthermore, the parallel capacitor in this preferred embodiment uses circular parallel plates with a diameter of 1 m and a spacing of 0.5 m (material: stainless steel silver-plated, surface roughness ≤ 1.6 μm), and the edge uses an annular voltage-sharing shielding structure to avoid electric field distortion (field strength uniformity ≥ 95%). When a power frequency electric field strength of 50 kV / m needs to be applied, according to the corresponding formula, the high-voltage generator should output a power frequency voltage of 25 kV.

[0104] Preferably, the control unit is further configured to generate a control instruction and transmit it to the magnetic field generation unit when the real-time magnetic field strength is not less than the custom magnetic field strength threshold or the real-time electric field strength is not less than the custom electric field strength threshold, and control the high-voltage generator circuit breaker to open.

[0105] In this preferred embodiment, in order to ensure the safety of the equipment and the stability of the test during the test process, a protection strategy is formulated. When the real-time magnetic field strength is not less than the custom magnetic field strength threshold (such as 5 mT) or the real-time electric field strength is not less than the custom electric field strength threshold (such as 80 kV), the control unit generates a control instruction to trigger the high-voltage generator circuit breaker to open, thereby achieving an emergency stop.

[0106] Preferably, the control unit is further configured to perform closed-loop control on the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field intensity and the target magnetic field intensity, so that the real-time magnetic field intensity is equal to the target magnetic field intensity, and perform closed-loop control on the voltage to be output by the high-voltage generator according to the absolute error between the real-time electric field intensity and the target electric field intensity, so that the real-time electric field intensity is equal to the target electric field intensity.

[0107] The device for testing the reliability of a power sensor according to this preferred embodiment performs reliability testing on the sensor to be tested by accurately simulating the magnetic and electric field characteristics of different devices and different positions in a laboratory. The device can flexibly adjust the intensity, direction, and distribution characteristics of the magnetic and electric fields according to the requirements of the actual application scenario, so as to simulate the operating conditions in a real environment. In addition, it can also perform customized simulations for different types of sensors (such as current sensors, voltage sensors, etc.) to ensure that the experimental results are closer to the actual usage scenarios in practical applications. Through this device, potential defects of the sensor in a strong magnetic field and strong electric field environment can be effectively discovered, providing a scientific basis for subsequent optimization design. It should be noted that based on the simulation of the complex environment of the superposition of strong magnetic fields and strong electric fields in this preferred embodiment, by setting the standard value of the standard source to provide a standard excitation signal for the sensor to be tested, various extreme conditions such as full range, over range, and continuous alternation of the sensor to be tested can be simulated. Thus, not only can the performance of the sensor to be tested under different working conditions be evaluated, but also the long-term operation stability of the sensor can be evaluated through long-term cyclic testing, ensuring the comprehensiveness and accuracy of the test results. Further, this preferred embodiment can automatically complete the switching of various test conditions by presetting a test program on the premise of inputting corresponding test parameters, greatly improving the test efficiency and the consistency of the results. Moreover, the device can support the test requirements of different types of sensors (such as inductive, Hall effect, gas pressure type, etc.), can serve different application scenarios, and significantly reduces the test cost. This preferred embodiment comprehensively monitors the long-term operation stability of the sensor by introducing an automated data acquisition and analysis system into the control unit. The system can record the change trend of the output signal of the sensor to be tested over time in real time, and analyze the deviation, drift, and other performance indicators of the sensor to be tested during long-term operation through a preset evaluation algorithm. This automated test method can not only significantly improve the test efficiency, but also provide detailed data support for the optimization design of the sensor to be tested, ensuring its reliability and stability in practical applications.

[0108] Exemplary method

[0109] Figure 3 is a flowchart of a method for testing the reliability of a power sensor according to a preferred embodiment of the present invention. As Figure 3As shown, the method for testing the reliability of a power sensor in this preferred embodiment starts from step 301.

[0110] In step 301, test parameters are set, where the test parameters include the target electric field strength, the target magnetic field strength, the frequency of the alternating current, and the standard value of the standard excitation signal.

[0111] In this preferred embodiment, setting the target electric field strength, the target magnetic field strength, and the frequency of the alternating current is to simulate the strong magnetic field and strong electric field in the complex industrial environment of high-voltage equipment and strong-current equipment. When the generated strong electric field and strong magnetic field meet the simulation environment, the standard value can be set multiple times over the full range and even beyond the range based on the range of the sensor to be tested, so as to complete the reliability assessment in the full range and over-range cases.

[0112] Preferably, before setting the test parameters, it further includes:

[0113] Placing the Helmholtz coil inside the parallel plate capacitor, where the Helmholtz coil is made of non-conductive material, includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coil. The parallel plate capacitor is composed of two circular parallel metal plates with a constant distance;

[0114] Placing the sensor to be tested at the center of the Helmholtz coil and connecting it to the standard source.

[0115] Preferably, before setting the test parameters, it further includes fixing the sensor to be tested with a fixed tooling.

[0116] In step 302, a control instruction is generated according to the test parameters.

[0117] Preferably, generating a control instruction according to the test parameters includes:

[0118] Calculating the amplitude I of the alternating current to be provided according to the target magnetic field strength, and its calculation formula is:

[0119]

[0120] In the formula, r and N are the radius and the number of turns of the Helmholtz coil respectively, B is the target magnetic field strength, and μ0 is the vacuum constant;

[0121] Calculating the voltage V to be output according to the target electric field strength, and its calculation formula is:

[0122] V = E * D

[0123] In the formula, E is the diameter of the circular parallel metal plate, and D is the distance between the circular parallel metal plates;

[0124] Generate a control command for generating a controllable magnetic field according to the frequency of the set alternating current and the amplitude of the alternating current to be provided, generate a control command for generating a uniform electric field according to the voltage to be output, and generate a control command for the standard source to generate a standard excitation signal according to the set standard value.

[0125] In step 303, an alternating current is provided to the Helmholtz coil by a power frequency current source to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment where the sensor to be tested is located under the working state. Among them, the frequency and amplitude of the alternating current are determined according to the control command.

[0126] In step 304, a high-voltage direct current or a power frequency alternating current power supply is provided to the parallel plate capacitor by a high-voltage generator to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment where the sensor to be tested is located under the working state. Among them, the output voltage of the high-voltage generator is determined according to the control command.

[0127] In step 305, a standard excitation signal is provided to the sensor to be tested by a standard source matching the sensor to be tested, so as to use the standard excitation signal to simulate the input conditions of the sensor to be tested under the actual working conditions, and the output data generated by the sensor to be tested based on the input conditions is collected by a data acquisition module. Among them, the standard value of the standard excitation signal is determined according to the control command.

[0128] In step 306, a test result is generated according to the output data.

[0129] Preferably, the generating the test result according to the output data includes:

[0130] When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is reliable.

[0131] Preferably, the method further includes measuring the real-time magnetic field intensity generated by the Helmholtz coil and the real-time electric field intensity between the parallel plate capacitors, and when the real-time magnetic field intensity is not less than the custom magnetic field intensity threshold or the real-time electric field intensity is not less than the custom electric field intensity threshold, a control command is generated and transmitted to the magnetic field generating unit to control the opening of the air switch of the high-voltage generator.

[0132] Preferably, the method further includes closed-loop controlling the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field intensity and the target magnetic field intensity, so that the real-time magnetic field intensity is equal to the target magnetic field intensity, and closed-loop controlling the voltage to be output by the high-voltage generator according to the absolute error between the real-time electric field intensity and the target electric field intensity, so that the real-time electric field intensity is equal to the target electric field intensity.

[0133] The method for testing the reliability of the power sensor described in this preferred embodiment is automatically completed based on the device for testing the reliability of the power sensor described in the present invention, and the achieved technical effects are the same, which will not be elaborated here.

[0134] Exemplary electronic device

[0135] Figure 4 It is a schematic structural diagram of an electronic device according to a preferred embodiment of the present invention. The electronic device can be any one or both of the first device and the second device, or a stand-alone device independent of them, and the stand-alone device can communicate with the first device and the second device to receive the collected input signals from them. Figure 4 The block diagram of an electronic device according to an embodiment of the present disclosure is illustrated. As Figure 4 shown, the electronic device includes one or more processors 401 and a memory 402.

[0136] The processor 401 can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions.

[0137] The memory 402 can include one or more computer program products, and the computer program products can include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory can include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions can be stored on the computer-readable storage medium, and the processor 401 can run the program instructions to implement the energy consumption anomaly diagnosis method based on the enterprise energy consumption space described in the various embodiments disclosed above and / or other desired functions. In one example, the electronic device can further include: an input device 403 and an output device 404, and these components are interconnected through a bus system and / or other forms of connection mechanisms (not shown).

[0138] In addition, the input device 403 can further include, for example, a keyboard, a mouse, and so on.

[0139] The output device 404 can output various information to the outside. The output device 404 can include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, and so on.

[0140] Of course, for simplicity, Figure 4Only some of the components related to the present disclosure in the electronic device are shown, and components such as buses, input / output interfaces, etc. are omitted. In addition, according to specific application scenarios, the electronic device may further include any other appropriate components.

[0141] Exemplary computer program product and computer-readable storage medium

[0142] In addition to the above methods and devices, an embodiment of the present disclosure may also be a computer program product, which includes computer program instructions that, when run by a processor, cause the processor to execute the steps in the method for testing the reliability of a power sensor according to various embodiments of the present disclosure described in the "Exemplary Method" section above of this specification.

[0143] The computer program product may be written in any combination of one or more programming languages for programming code to perform the operations of the embodiments of the present disclosure. The programming languages include object-oriented programming languages such as Java, C++, etc., and also include conventional procedural programming languages such as the "C" language or similar programming languages. The program code may be executed entirely on the user's computing device, partially on the user device, executed as a stand-alone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0144] In addition, an embodiment of the present disclosure may also be a computer-readable storage medium having computer program instructions stored thereon that, when run by a processor, cause the processor to execute the steps in the method for testing the reliability of a power sensor according to various embodiments of the present disclosure described in the "Exemplary Method" section above of this specification.

[0145] The computer-readable storage medium may employ any combination of one or more readable media. The readable media may be a readable signal medium or a readable storage medium. The readable storage medium may, for example, include but is not limited to an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0146] The basic principles of the present disclosure have been described in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present disclosure are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present disclosure. Additionally, the specific details disclosed above are only for illustrative and easy-to-understand purposes and are not limitations. The above details do not limit the present disclosure to necessarily implementing with the above specific details.

[0147] Each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For system embodiments, since they basically correspond to method embodiments, the description is relatively simple. For related parts, reference can be made to the partial description of the method embodiments.

[0148] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present disclosure are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or" and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to" and can be used interchangeably with each other.

[0149] The devices and methods of the present disclosure can be implemented in many ways. For example, the devices and methods of the present disclosure can be implemented through software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of the steps for the method is only for illustration. The steps of the method of the present disclosure are not limited to the specific order described above, unless otherwise specifically stated in other ways. Additionally, in some embodiments, the present disclosure can also be implemented as a program recorded in a recording medium, and these programs include machine-readable instructions for implementing the method according to the present disclosure. Therefore, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.

[0150] It should also be noted that in the devices, equipment, and methods of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present disclosure. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present disclosure. Therefore, the present disclosure is not intended to be limited to the aspects shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

[0151] The above description has been presented for purposes of illustration and description. Additionally, this description is not intended to limit the embodiments of the present disclosure to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.

Claims

1. A device for testing the reliability of a power sensor, characterized in that, The device includes: A magnetic field generating unit, which is used to provide an alternating current for a Helmholtz coil through a power frequency current source, so as to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment where the sensor to be tested is located in the working state. Wherein, the frequency and amplitude of the alternating current are determined according to the control instructions output by the control unit; An electric field generating unit, which is used to provide a high-voltage direct current or a power frequency alternating current power supply for a parallel plate capacitor through a high-voltage generator, so as to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment where the sensor to be tested is located in the working state. Wherein, the output voltage of the high-voltage generator is determined according to the control instructions output by the control unit; A unit under test, which is used to provide a standard excitation signal for the sensor to be tested through a standard source matching the sensor to be tested, so as to simulate the input conditions of the sensor to be tested under actual working conditions by using the standard excitation signal, and transmit the output data generated by the sensor to be tested based on the input conditions to the control unit through a data acquisition module. Wherein, the standard value of the standard excitation signal is determined according to the control instructions output by the control unit; A control unit, which is used to set test parameters, generate control instructions according to the test parameters, and transmit the control instructions to the magnetic field generating unit, the electric field generating unit and the unit under test, and generate test results according to the output data. Wherein, the test parameters include the target electric field strength, the target magnetic field strength, the frequency of the alternating current and the standard value of the standard excitation signal.

2. The device according to claim 1, characterized in that The Helmholtz coil is made of a non-conductive material and is placed inside the parallel plate capacitor; the Helmholtz coil includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coil. The parallel plate capacitor is composed of two circular parallel metal plates with a constant distance. The sensor to be tested is placed in the center of the Helmholtz coil and is connected to the standard source.

3. The device according to claim 1, wherein The magnetic field generating unit further includes a magnetometer, which is used to measure the real-time magnetic field strength generated by the Helmholtz coil. The electric field generating unit further includes a field strength meter, which is used to measure the real-time electric field strength between the parallel plate capacitors. Wherein, the real-time magnetic field strength and the real-time electric field strength are transmitted to the control unit.

4. The device according to claim 1, characterized in that, The unit under test further includes a fixing tooling, which is used to fix the sensor to be tested.

5. The device according to claim 1, characterized in that, The control unit includes: A human-computer interaction interface, which is used to set test parameters and display the output data and test results; An industrial personal computer, which is used to generate control instructions according to the test parameters and generate test results according to the output data; A communication module, which is used to perform data transmission between the industrial personal computer and the magnetic field generating unit, the electric field generating unit, and the unit under test.

6. The device according to claim 5, characterized in that, The industrial personal computer generates control instructions according to the test parameters and generates test results according to the output data, including: Calculating the amplitude I of the alternating current that the magnetic field generating unit is intended to provide according to the target magnetic field strength, and its calculation formula is: In the formula, r and N are respectively the radius and the number of turns of the Helmholtz coil, B is the target magnetic field strength, and μ0 is the vacuum constant; Calculating the voltage V that the electric field generating unit is intended to output according to the target electric field strength, and its calculation formula is: V = E * D Wherein, E is the diameter of the circular parallel metal plates, and D is the distance between the circular parallel metal plates; Generate a control command for the magnetic field generating unit to generate a controllable magnetic field according to the set frequency of the alternating current and the amplitude of the alternating current to be provided, generate a control command for the electric field generating unit to generate a uniform electric field according to the voltage to be output, and generate a control command for the standard source to generate a standard excitation signal according to the set standard value; Generate a test result based on the output data, where: When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is reliable.

7. The device according to claim 3, characterized in that, The control unit is further configured to generate a control command and transmit it to the magnetic field generating unit when the real-time magnetic field intensity is not less than the custom magnetic field intensity threshold or the real-time electric field intensity is not less than the custom electric field intensity threshold, and control the high-voltage generator circuit breaker to open.

8. The device according to claim 7, characterized in that, The control unit is further configured to perform closed-loop control on the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field intensity and the target magnetic field intensity, so that the real-time magnetic field intensity is equal to the target magnetic field intensity, and perform closed-loop control on the voltage to be output by the high-voltage generator according to the absolute error between the real-time electric field intensity and the target electric field intensity, so that the real-time electric field intensity is equal to the target electric field intensity.

9. A method for testing the reliability of a power sensor using any one of the devices recited in claims 1 to 8, characterized in that, The method includes: Set test parameters, where the test parameters include the target electric field intensity, the target magnetic field intensity, the frequency of the alternating current, and the standard value of the standard excitation signal; Generate control commands according to the test parameters; Provide an alternating current to the Helmholtz coil through a power frequency current source to generate a controllable magnetic field by using the Helmholtz coil to simulate the magnetic field environment where the sensor to be tested is located in the working state, where the frequency and amplitude of the alternating current are determined according to the control command; Provide a high-voltage DC or power frequency AC power supply to the parallel plate capacitor through a high-voltage generator to generate a uniform electric field by using the parallel plate capacitor to simulate the electric field environment where the sensor to be tested is located in the working state, where the output voltage of the high-voltage generator is determined according to the control command; Provide a standard excitation signal to the sensor to be tested through a standard source matching the sensor to be tested, to simulate the input conditions of the sensor to be tested under actual working conditions by using the standard excitation signal, and collect the output data generated by the sensor to be tested based on the input conditions through a data acquisition module, where the standard value of the standard excitation signal is determined according to the control command; Generate a test result based on the output data.

10. The method according to claim 9, wherein Before setting the test parameters, it further includes: Place the Helmholtz coil inside the parallel plate capacitor, where the Helmholtz coil is made of a non-conductive material, includes two groups of coaxial circular coils, and the distance between the two groups of coils is equal to the radius of the coils, and the parallel plate capacitor is composed of two circular parallel metal plates with a constant distance; Place the sensor to be tested at the center of the Helmholtz coil and connect it to the standard source.

11. The method according to claim 9, characterized in that Before setting the test parameters, it further includes fixing the sensor to be tested with a fixed tooling.

12. The method according to claim 9, wherein The generating the control commands according to the test parameters includes: Calculate the amplitude I of the alternating current to be provided according to the target magnetic field strength, and its calculation formula is: Wherein, r and N are respectively the radius and the number of turns of the Helmholtz coil, B is the target magnetic field strength, and μ0 is the vacuum constant; Calculate the output voltage v according to the target electric field strength, and its calculation formula is: V = E * D Wherein, E is the diameter of the circular parallel metal plates, and D is the distance between the circular parallel metal plates; Generate a control command for generating a controllable magnetic field according to the set frequency of the alternating current and the amplitude of the alternating current to be provided, generate a control command for generating a uniform electric field according to the output voltage to be generated, and generate a control command for the standard source to generate a standard excitation signal according to the set standard value.

13. The method according to claim 9, wherein The generating the test result according to the output data includes: When the relative error between the output data and the set standard value is not greater than the custom error threshold, the test result is that the sensor to be tested is reliable; otherwise, the test result is that the sensor to be tested is reliable.

14. The method according to claim 9, characterized in that, The method further includes measuring the real-time magnetic field strength generated by the Helmholtz coil and the real-time electric field strength between the parallel plate capacitors, and generating a control command to be transmitted to the magnetic field generating unit and controlling the high-voltage generator circuit breaker to open when the real-time magnetic field strength is not less than the custom magnetic field strength threshold or the real-time electric field strength is not less than the custom electric field strength threshold.

15. The method according to claim 9, characterized in that, The method further includes closed-loop controlling the alternating current to be provided by the power frequency current source according to the absolute error between the real-time magnetic field strength and the target magnetic field strength, so that the real-time magnetic field strength is equal to the target magnetic field strength, and closed-loop controlling the output voltage to be generated by the high-voltage generator according to the absolute error between the real-time electric field strength and the target electric field strength, so that the real-time electric field strength is equal to the target electric field strength.

16. A computer-readable storage medium, characterized in that, [[ID=!0]]The storage medium stores a computer program, and the computer program is used to execute the method according to any one of claims 9 to 15 above.

17. An electronic device, characterized in that, The electronic device includes: A processor; A memory for storing executable instructions of the processor; The processor is configured to read the executable instructions from the memory and execute the instructions to implement the method according to any one of claims 9 to 15 above.

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