Comprehensive interference test system and test method for intelligent electric energy meter

Abstract

The invention discloses a comprehensive interference test system and test method for an intelligent electric energy meter, and the system comprises a master control system which controls a test device and communicates with a to-be-tested electric energy meter for data interaction. The test equipment comprises an electric energy meter calibration device, the electric energy meter calibration device is connected with a power supply control cabinet, and the power supply control cabinet is connected with a variable-frequency stabilized-voltage power supply and controls the output of the variable-frequency stabilized-voltage power supply. A to-be-tested electric energy meter is installed in the meter hanging frame, and the meter hanging frame simulates the magnetic flux leakage influence and the power frequency magnetic field influence through wiring and electric energy meter arrangement. The meter hanging frame is placed in the constant-temperature and constant-humidity test box, and the constant-temperature and constant-humidity test box simulates different climate test conditions; the meter hanging frame is connected with the load control cabinet, and the load control cabinet is connected with the real load and controls operation of the real load.

Description

Technical Field

[0001] The present invention relates to the field of smart electric meter testing, and in particular to a smart electric energy meter comprehensive interference testing system and testing method. Background Art

[0002] In the on-site power grid environment, the energy meter is usually installed in the meter box, which is subject to interferences such as radio interference, magnetic leakage, power frequency magnetic field, power supply harmonics, etc., forming a complex and comprehensive operating environment. The existing meter testing technology solutions often test single interferences one by one, so there are problems such as single test points and insufficient coverage, and the efficiency of separate testing of various interferences is low.

[0003] The invention patent with the prior art application publication number CN109669154A discloses a smart meter testing method based on a laboratory simulation environment, including a test environment simulation module, a control module and a smart meter under test, wherein the test environment simulation module includes an electronic interference module, a temperature and humidity simulation module, and a power supply simulation module, and the electronic interference module, the temperature and humidity simulation module, and the power supply simulation module are all installed in an environmental test box, wherein: the test environment simulation module is used to provide a simulated test environment for the smart meter under test; the test environment simulation module and the smart meter under test are both controlled by the control module. Summary of the invention

[0004] In the on-site power grid environment, the energy meter is usually installed in the meter box. There are interferences such as radio interference, magnetic leakage, power frequency magnetic field, power supply harmonics, etc., which constitute a complex and comprehensive operating environment. The existing meter testing technology has problems such as single test points and insufficient coverage, and the efficiency of separate testing of various types of interference is low. The existing technology uses a power frequency magnetic field generator and an energy meter calibration device to test the impact of the power frequency magnetic field. However, the power frequency magnetic field impact equipment is wound with a coil, which will cause heating and other problems during long-term operation, and is not suitable for long-term testing conditions; at the same time, the existing technology lacks the test of the impact of magnetic leakage.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is: an intelligent electric energy meter comprehensive interference test system, including a general control system, the general control system controls the test equipment and communicates with the electric energy meter to be tested to exchange data; the test equipment includes an electric energy meter calibration device, the electric energy meter calibration device is connected to a power supply control cabinet, the power supply control cabinet is connected to a variable frequency voltage-stabilized power supply and controls the output of the variable frequency voltage-stabilized power supply; the electric energy meter to be tested is installed in a hanging meter rack, and the hanging meter rack simulates the leakage magnetic field and the power frequency magnetic field through wiring and electric energy meter layout; the hanging meter rack is placed in a constant temperature and humidity test box, and the constant temperature and humidity test box simulates different climate test conditions; the hanging meter rack is connected to a load control cabinet, and the load control cabinet is connected to a real load and controls the operation of the real load.

[0006] As a further improvement of the present invention, the overall control system includes an equipment control module, which integrates the dynamic link library instructions of each device and controls the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber, as well as the power control cabinet, load control cabinet and actual load by calling the equipment dynamic link library.

[0007] As a further improvement of the present invention, the overall control system includes a communication module, which establishes a communication connection with the electric energy meter under test. The communication module has both a power line carrier and an RF radio signal. During testing, spatial conduction of a power line carrier signal and interference of an RF radio signal are generated to simulate radio interference in a field environment.

[0008] As a further improvement of the present invention, the electric energy meter calibration device is configured with a standard meter and an error meter to measure the electric energy error and clock error of the electric energy meter under test, and can output voltage and current through an ARM signal source. Harmonic signals can be superimposed on both the voltage and current loops to simulate the harmonic impact of virtual loads.

[0009] As a further improvement of the present invention, the variable frequency voltage-stabilized power supply outputs an industrial frequency voltage, and a real load is connected to the rear end to simulate the harmonic influence of a typical real load.

[0010] As a further improvement of the present invention, the communication module includes an MCU control core, which controls the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter; the communication module has a passive meter reading mode and an active meter reading mode, and the MCU control core determines whether to enter the active meter reading mode according to the communication address of the electric energy meter; in the active meter reading mode, the networking is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second. During this period, whether the communication is successful is not evaluated. Through continuous communication instructions, continuous power line carrier signal spatial conduction and RF radio signal interference are simulated. The communication address of the energy meter in the test state is 1111111111111. Passive meter reading and active meter reading modes are realized through specific module program design judgment. The module will automatically obtain the communication address of the energy meter after power-on. When the communication address is detected to be 111111111111, the active meter reading mode is started. After entering the active meter reading mode, the networking is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the energy meter at a frequency of 1 time / second. During this period, whether the communication is successful is not evaluated. The mode is judged after each power-on; otherwise, when other addresses are detected, the normal passive meter reading mode is restored.

[0011] As a further improvement of the present invention, the MCU control core adjusts the output voltage and peak shaving factor according to the adjustable power parameters, combined with the voltage fluctuations of the field operation and the redundancy of the communication module to determine the transmission power of the module. Through the module-specific program design, the power parameter instruction is configured, and the parameter determines the transmission power of the module by adjusting the module output voltage and the peak shaving factor. According to the maximum power consumption Pmax requirement in the communication state in the standard requirements, the voltage fluctuations of the field operation and the redundancy of the communication module are considered, and 1.2Pmax is used for testing to calculate the output voltage and peak shaving factor required under the condition of 1.2Pmax transmission power. Combined with the active meter reading mode of the communication module, a continuous high-power transmission state is achieved to simulate the continuous power line carrier signal spatial conduction and RF radio signal interference.

[0012] As a further improvement of the present invention, the overall control system also includes a data comparison module, which stores pre-test data and post-test data; during the test, all interactive data are encoded according to a protocol format, and the data comparison module automatically performs data analysis through data identifiers based on the protocol format, and automatically compares the data before and after the test to obtain the results.

[0013] As a further improvement of the present invention, the meter rack is wired through a vertical wire trough, the wire trough is close to the back of the electric energy meter to be tested, and during the test, the wire trough is passed with a maximum current to simulate the influence of the power frequency magnetic field.

[0014] As a further improvement of the present invention, each electric energy meter to be tested in the meter rack is provided with an independent meter support, on which a pulley is provided. The meter support adjusts its position on the slide rail through the pulley, so that the electric energy meter to be tested fits tightly, and the transformers in the meter influence each other, simulating the leakage magnetic influence in field applications.

[0015] Specifically, the present invention provides a comprehensive interference test method for a smart electric energy meter, which includes a virtual load interference test and a real load interference test. The virtual load interference test steps are as follows: S1: Ambient temperature and humidity simulation: the electric meter is placed in extreme conditions of high temperature Th, low temperature Tl, high temperature and high humidity RH; S2: Input a working voltage lower than the rated voltage to test the impact of electrical stress in the low voltage state, and then input a working voltage higher than the rated voltage to test the impact of electrical stress in the high voltage state; S3: Input 1-2 times of Imax to test the impact of electrical stress; S4: repeated superposition of harmonic influence; S5: applying power line carrier signal spatial conduction and RF radio signal interference; S6: Apply power frequency magnetic field and leakage magnetic field influence; The real load interference test steps are: S1: Ambient temperature and humidity simulation: the electric meter is placed in extreme conditions of high temperature Th, low temperature Tl, high temperature and high humidity RH; S2: Input Un, the load current is determined according to the connected load; S3: Apply power line carrier signal spatial conduction and RF radio signal interference S4: Apply power frequency magnetic field and leakage magnetic field influence; S5: Connect an AC motor or an AC charging pile to simulate harmonic impact; S6: Connect to the electronic load box to simulate resistive, inductive and capacitive load currents; Among them, Un represents the rated voltage.

[0016] The beneficial effects of the present invention are as follows: comprehensive test interference superimposes multiple interference types based on field applications, continuous interference testing can stimulate potential problems or weak parts of the electric meter, and at the same time, the control of each interference type test is simple and convenient, and the real load and virtual load and harmonic influence are switched by the power control cabinet, and the effect of simulating leakage magnetic influence and power frequency magnetic field influence is achieved through the structural design of the meter rack, and the active meter reading mode and transmission power adjustment function of the communication module are utilized to achieve continuous interference based on the upper limit of the standard limit. The intelligent electric energy meter comprehensive interference test system of the present invention has simple interference control, convenient operation, and comprehensive testing of multiple interferences at the same time, and the test results are more accurate and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a block diagram of the overall system of the present invention.

[0018] Figure 2 This is a block diagram of the communication module of the present invention.

[0019] Figure 3 This is a block diagram of the virtual load test of the present invention.

[0020] Figure 4 This is a real load test block diagram of the present invention.

[0021] Figure 5 This is a flow chart of the virtual load test of the present invention.

[0022] Figure 6 This is a flow chart of the actual load test of the present invention.

[0023] Figure 7 It is a structural schematic diagram of the wall watch rack of the present invention.

[0024] In the figure, 1 is a wire trough, 2 is a table support, and 3 is a slide rail. DETAILED DESCRIPTION

[0025] Embodiment 1: A comprehensive interference test system for a smart electric energy meter includes a general control system, which controls the test equipment and communicates with the electric energy meter to be tested for data exchange; Figure 1 As shown, the test equipment includes an electric energy meter calibration device, which is connected to a power supply control cabinet, which is connected to a variable frequency voltage-stabilized power supply and controls the output of the variable frequency voltage-stabilized power supply; the electric energy meter to be tested is installed in a meter rack, which simulates the influence of leakage magnetic field and power frequency magnetic field through wiring and electric energy meter layout; the meter rack is placed in a constant temperature and humidity test chamber, which simulates different climate test conditions; the meter rack is connected to a load control cabinet, which is connected to a real load and controls the operation of the real load.

[0026] Among them, the overall control system includes an equipment control module, which integrates the dynamic link library instructions of each device, and controls the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber, as well as the power control cabinet, load control cabinet and real load by calling the equipment dynamic link library. In the complex environment on site, the operation stability and reliability of the meter product are particularly important. The anti-interference ability of the meter is an important manifestation of product reliability. Improving the anti-interference ability is an important way to increase product reliability. Through comprehensive interference testing methods, product defects and weak links can be effectively discovered, the risk of on-site operation can be reduced, and product quality can be continuously improved. Therefore, it is necessary to control different interference devices through the equipment control module to perform interference tests on the meter to be tested. The equipment control module calls the equipment dynamic link library to control the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber and other equipment, as well as the power control cabinet, load control cabinet and real load to achieve the test conditions. The equipment control module integrates the dynamic link library instructions of each device, realizes the control of the equipment by calling the equipment dynamic link library, and configures the quick interface of voltage regulation, current regulation and temperature regulation to realize the rapid operation of the equipment.

[0027] Specifically, the overall control system includes a communication module, which establishes a communication connection with the electric energy meter under test to realize information interaction of 485 communication and carrier communication. In the field application of electric meters, HPLC modules and dual-mode modules are widely used. These two modules will generate radio interference and spatial radiation conduction during the communication process, which will affect the electric meter. Therefore, it is necessary to test the electric meter for radio interference. This embodiment simulates radio interference in the field environment through the design of the communication module. The communication module adopts a dual-mode module. The dual-mode module has power line carrier and RF radio signal. During the test, power line carrier signal spatial conduction and RF radio signal interference are generated to simulate radio interference in the field environment.

[0028] Specifically, the electric energy meter calibration device is equipped with a standard meter and an error meter to measure the electric energy error and clock error of the electric energy meter under test, and can output voltage and current through the ARM signal source. The voltage and current loops can both superimpose harmonic signals to simulate the harmonic influence of virtual loads. In the prior art, the communication module generally sends a reading instruction after the network is successfully established. The electric energy meter module responds to the instruction and performs passive reading with the electric energy meter. The communication module program of this embodiment can be configured as an active meter reading mode (self-sending mode), that is, there is no need for the master station or the concentrator CCO routing module to issue instructions, and actively reads with the electric energy meter in a fixed frequency and fixed instruction mode. In the active meter reading mode, the network is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second. During this period, whether the communication is successful is not assessed. Through continuous communication instructions, continuous power line carrier signal spatial conduction and RF radio signal interference are simulated.

[0029] Specifically, the variable frequency regulated power supply outputs industrial frequency voltage, and the back end is connected to a real load to simulate the harmonic impact of a typical real load.

[0030] Specifically, the communication module includes an MCU control core, which controls the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter; the communication module has a passive meter reading mode and an active meter reading mode, and the MCU control core determines whether to enter the active meter reading mode according to the communication address of the electric energy meter; in the active meter reading mode, the networking is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second, during which the communication is not evaluated whether it is successful, and continuous power line carrier signal space conduction and RF radio signal interference are simulated through continuous communication instructions. The communication address of the electric energy meter in the test state is 1111111111111, and the passive meter reading and active meter reading modes are realized through the judgment of specific module program design. After the module is powered on, it will automatically obtain the communication address of the electric energy meter, and when the communication address is detected to be 11111111111111, the active meter reading mode is started, and the networking is stopped after entering the active meter reading mode, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second, during which the communication is not evaluated whether it is successful. The mode is determined each time the power is turned on again; otherwise, when other addresses are detected, the normal passive meter reading mode is restored.

[0031] Specifically, the MCU control core adjusts the output voltage and peak shaving factor according to the adjustable power parameters, combined with the voltage fluctuations of the on-site operation and the redundancy of the communication module to determine the transmission power of the module. In the prior art, the communication module is generally not adjustable, and the transmission power is the maximum in the communication state, abnormal state, etc., and there is no transmission power when not communicating. Through module-specific program design, the power parameter instruction is configured. The parameter determines the transmission power of the module by adjusting the module output voltage and peak shaving factor. According to the maximum power consumption Pmax requirement in the communication state in the standard requirements, considering the voltage fluctuations of the on-site operation and the redundancy of the communication module, 1.2Pmax is used for testing to calculate the output voltage and peak shaving factor required under the condition of 1.2Pmax transmission power. Combined with the active meter reading mode of the communication module, a continuous high-power transmission state is achieved to simulate continuous power line carrier signal spatial conduction and RF radio signal interference.

[0032] The specific working process of the communication module is as follows Figure 2 As shown, the electric energy meter provides the VCC voltage of the module, which is processed by the module MCU to control the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter.

[0033] Specifically, the overall control system also includes a data comparison module, which stores pre-test data and post-test data; during the test, all interactive data are encoded according to the protocol format and transmitted through command frames, which include a frame start character, an address field, a frame start character, a control code, a data field length, a data field, a check code and an end character. The data comparison module automatically parses the data through the data identifier according to the protocol format, and intercepts the data field DATA data of the corresponding length through the data field length L of the command frame. The intercepted data includes the unique identifier and data result of each test data item. The data comparison module intercepts and saves the data result to the data item record of different tests through the unique identifier of the data item, and automatically compares the data before and after the test to obtain the result.

[0034] Specifically, the structure of the hanging meter rack is as follows: Figure 7 As shown, the meter rack is routed through a vertical wire duct 1, which is close to the back of the electric energy meter under test. During the test, the wire duct 1 is passed with a maximum current to simulate the influence of the power frequency magnetic field.

[0035] Specifically, each electric energy meter to be tested in the hanging meter rack is provided with an independent meter holder 2, on which a pulley is provided, and the meter holder 2 is adjusted on the slide rail 3 by the pulley, and the hanging meter rack is equipped with an integral adjustment screw, and the vertical electric energy meters can be moved as a whole, so that the left and right sides of the electric energy meters fit tightly, and the transformers in the meters affect each other, simulating the leakage magnetic influence in field applications. The hanging meter rack is equipped with a fixing screw, and a spring locking structure is provided on the fixing screw. After the position is adjusted in place, it can be fixed by the fixing screw to avoid loosening or displacement during the test.

[0036] Specifically, the test process of this embodiment is as follows: S1: Check before the test: Before the test, measure the electric energy error and clock error of the meter and store them, and read the parameters and storage data in the meter at the same time; S2: Virtual load comprehensive interference test: Switch to virtual load comprehensive interference test mode through the power control cabinet. The specific process is as follows: Figure 3 As shown; S3: Post-test inspection: After the test, measure the electric energy error, clock error, over-meter parameters and storage data; S4: Data comparison: The data comparison module compares the data before and after the test and outputs the results; S5: Real-load comprehensive interference test: Switch to real-load comprehensive interference test mode through the power control cabinet. The specific process is as follows: Figure 4 As shown; S6: Post-test inspection: After the test, measure the electric energy error, clock error, over-meter parameters and storage data; S7: Data comparison: The data comparison module compares the data before and after the test and outputs the results.

[0037] Embodiment 2: A comprehensive interference test system for intelligent electric energy meters, including a general control system, which controls the test equipment and communicates with the electric energy meter to be tested to exchange data; the test equipment includes an electric energy meter calibration device, which is connected to a power control cabinet, which is connected to a variable frequency voltage-stabilized power supply and controls the output of the variable frequency voltage-stabilized power supply; the electric energy meter to be tested is installed in a meter rack, which simulates the influence of leakage magnetic field and power frequency magnetic field through wiring and electric energy meter layout; the meter rack is placed in a constant temperature and humidity test chamber, which simulates different climate test conditions; the meter rack is connected to a load control cabinet, which is connected to a real load and controls the operation of the real load.

[0038] Specifically, the overall control system includes an equipment control module, which integrates the dynamic link library instructions of each device, and controls the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber, as well as the power control cabinet, load control cabinet and real load by calling the equipment dynamic link library. In the complex environment on site, the operation stability and reliability of the meter product are particularly important. The anti-interference ability of the meter is an important manifestation of product reliability. Improving the anti-interference ability is an important way to increase product reliability. Through comprehensive interference testing methods, product defects and weak links can be effectively discovered, the risk of on-site operation can be reduced, and product quality can be continuously improved. Therefore, it is necessary to control different interference devices through the equipment control module to perform interference tests on the meter to be tested. The equipment control module calls the equipment dynamic link library to control the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber and other equipment, as well as the power control cabinet, load control cabinet and real load to achieve the test conditions. The equipment control module integrates the dynamic link library instructions of each device, realizes the control of the device by calling the device dynamic link library, and configures the quick interface of voltage regulation, current regulation and temperature regulation to realize the rapid operation of the device.

[0039] Specifically, the overall control system includes a communication module, which establishes a communication connection with the electric energy meter under test to realize information interaction of 485 communication and carrier communication. In the field application of electric meters, HPLC modules and dual-mode modules are widely used. These two modules will generate radio interference and spatial radiation conduction during the communication process, which will affect the electric meter. Therefore, it is necessary to test the electric meter for radio interference. This embodiment simulates radio interference in the field environment through the design of the communication module. The communication module adopts a dual-mode module. The dual-mode module has power line carrier and RF radio signal. During the test, power line carrier signal spatial conduction and RF radio signal interference are generated to simulate radio interference in the field environment.

[0040] Specifically, the electric energy meter calibration device is equipped with a standard meter and an error meter to measure the electric energy error and clock error of the electric energy meter under test, and can output voltage and current through the ARM signal source. The voltage and current loops can both superimpose harmonic signals to simulate the harmonic influence of virtual loads. In the prior art, the communication module generally sends a reading instruction after the network is successfully established. The electric energy meter module responds to the instruction and performs passive reading with the electric energy meter. The communication module program of this embodiment can be configured as an active meter reading mode (self-sending mode), that is, there is no need for the master station or the concentrator CCO routing module to issue instructions, and actively reads with the electric energy meter in a fixed frequency and fixed instruction mode. In the active meter reading mode, the network is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second. During this period, whether the communication is successful is not assessed. Through continuous communication instructions, continuous power line carrier signal spatial conduction and RF radio signal interference are simulated.

[0041] Specifically, the variable frequency regulated power supply outputs industrial frequency voltage, and the back end is connected to a real load to simulate the harmonic impact of a typical real load.

[0042] Specifically, the communication module includes an MCU control core, which controls the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter; the communication module has a passive meter reading mode and an active meter reading mode, and the MCU control core determines whether to enter the active meter reading mode according to the communication address of the electric energy meter; in the active meter reading mode, the networking is stopped, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second, during which the communication is not evaluated whether it is successful, and continuous power line carrier signal space conduction and RF radio signal interference are simulated through continuous communication instructions. The communication address of the electric energy meter in the test state is 1111111111111, and the passive meter reading and active meter reading modes are realized through the judgment of specific module program design. After the module is powered on, it will automatically obtain the communication address of the electric energy meter, and when the communication address is detected to be 11111111111111, the active meter reading mode is started, and the networking is stopped after entering the active meter reading mode, the frequency band is switched to 0.7~3M, and a fixed meter reading instruction is sent to the electric energy meter at a frequency of 1 time / second, during which the communication is not evaluated whether it is successful. The mode is determined each time the power is turned on again; otherwise, when other addresses are detected, the normal passive meter reading mode is restored.

[0043] Specifically, the MCU control core adjusts the output voltage and peak shaving factor according to the adjustable power parameters, combined with the voltage fluctuations of the on-site operation and the redundancy of the communication module to determine the transmission power of the module. In the prior art, the communication module is generally not adjustable, and the transmission power is the maximum in the communication state, abnormal state, etc., and there is no transmission power when not communicating. Through module-specific program design, the power parameter instruction is configured. The parameter determines the transmission power of the module by adjusting the module output voltage and peak shaving factor. According to the maximum power consumption Pmax requirement in the communication state in the standard requirements, considering the voltage fluctuations of the on-site operation and the redundancy of the communication module, 1.2Pmax is used for testing to calculate the output voltage and peak shaving factor required under the condition of 1.2Pmax transmission power. Combined with the active meter reading mode of the communication module, a continuous high-power transmission state is achieved to simulate continuous power line carrier signal spatial conduction and RF radio signal interference.

[0044] The specific working process of the communication module is as follows Figure 2 As shown, the electric energy meter provides the VCC voltage of the module, which is processed by the module MCU to control the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter.

[0045] Specifically, the overall control system also includes a data comparison module, which stores pre-test data and post-test data; during the test, all interactive data are encoded according to the protocol format and transmitted through command frames, which include a frame start character, an address field, a frame start character, a control code, a data field length, a data field, a check code and an end character. The data comparison module automatically parses the data through the data identifier according to the protocol format, and intercepts the data field DATA data of the corresponding length through the data field length L of the command frame. The intercepted data includes the unique identifier and data result of each test data item. The data comparison module intercepts and saves the data result to the data item record of different tests through the unique identifier of the data item, and automatically compares the data before and after the test to obtain the result.

[0046] Specifically, the meter rack is routed through a vertical wire duct 1, which is close to the back of the electric energy meter under test. During the test, a maximum current is passed through the wire duct 1 to simulate the influence of the power frequency magnetic field.

[0047] Specifically, each electric energy meter to be tested in the hanging meter rack is provided with an independent meter holder 2, on which a pulley is provided, and the meter holder 2 is adjusted on the slide rail 3 by the pulley, and the hanging meter rack is equipped with an integral adjustment screw, and the vertical electric energy meters can be moved as a whole, so that the left and right sides of the electric energy meters fit tightly, and the transformers in the meters affect each other, simulating the leakage magnetic influence in field applications. The hanging meter rack is equipped with a fixing screw, and a spring locking structure is provided on the fixing screw. After the position is adjusted in place, it can be fixed by the fixing screw to avoid loosening or displacement during the test.

[0048] Specifically, the test process of this embodiment is as follows: S1: Check before the test: Before the test, measure the electric energy error and clock error of the meter and store them, and read the parameters and storage data in the meter at the same time; S2: Virtual load comprehensive interference test: Switch to virtual load comprehensive interference test mode through the power control cabinet. The specific process is as follows: Figure 3 As shown; S3: Post-test inspection: After the test, measure the electric energy error, clock error, over-meter parameters and storage data; S4: Data comparison: The data comparison module compares the data before and after the test and outputs the results; S5: Real-load comprehensive interference test: Switch to real-load comprehensive interference test mode through the power control cabinet. The specific process is as follows: Figure 4 As shown; S6: Post-test inspection: After the test, measure the electric energy error, clock error, over-meter parameters and storage data; S7: Data comparison: The data comparison module compares the data before and after the test and outputs the results.

[0049] Specifically, the virtual load comprehensive interference test steps of this embodiment are as follows: Figure 5 As shown: 1) Environmental temperature test simulation: high temperature 75℃±2℃, low temperature -40℃±2℃, high temperature and high humidity 85℃ / 85%RH; 2) Input 0.7Un to test the electrical stress effect in the low voltage state, and then input 1.2Un to test the electrical stress effect in the high voltage state; 3) Input 1.2Imax, electrical stress should be affected; 4) Superimposed 5th harmonic influence of 10%U and 40%I; 5) Apply power line carrier signal spatial conduction and RF radio signal interference; 6) Apply power frequency magnetic field and leakage magnetic field influence.

[0050] Specifically, the steps of the real load comprehensive interference test in this embodiment are as follows: Figure 6 As shown: 1) Environmental temperature test simulation: high temperature 75℃±2℃, low temperature -40℃±2℃, high temperature and high humidity 85℃ / 85%RH; 2) Input Un, the load current is determined according to the connected load; 3) Apply power line carrier signal spatial conduction and RF radio signal interference; 4) Apply power frequency magnetic field and leakage magnetic field influence; 5) Connect an AC motor or AC charging station to simulate harmonic impact; 6) Connect to the electronic load box to simulate resistive, inductive and capacitive load currents.

[0051] The above specific embodiments are only preferred implementations of the present invention, and are not intended to limit the specific implementation structure and implementation scope of the present invention. In fact, some equivalent changes can also be made according to the shape, structure and design purpose of the present invention. Therefore, all equivalent changes made according to the shape, structure and design purpose of the present invention should be included in the protection scope of the present invention, that is, these equivalent changes should be protected by the present invention.

Claims

1. A comprehensive interference test system for smart electric energy meters, characterized in that: It includes a general control system, which controls the test equipment and communicates with the electric energy meter to be tested to exchange data; the test equipment includes an electric energy meter calibration device, which is connected to a power control cabinet, which is connected to a variable frequency voltage-stabilized power supply and controls the output of the variable frequency voltage-stabilized power supply; the electric energy meter to be tested is installed in a meter rack, which simulates the influence of leakage magnetic field and power frequency magnetic field through wiring and electric energy meter layout; the meter rack is placed in a constant temperature and humidity test chamber, which simulates different climate test conditions; the meter rack is connected to a load control cabinet, which is connected to a real load and controls the operation of the real load.

2. The intelligent electric energy meter comprehensive interference test system according to claim 1, characterized in that: The overall control system includes an equipment control module, which integrates the dynamic link library instructions of each device and controls the electric energy meter calibration device, variable frequency voltage regulator, constant temperature and humidity test chamber, as well as the power control cabinet, load control cabinet and actual load by calling the equipment dynamic link library.

3. The intelligent electric energy meter comprehensive interference test system according to claim 1 or 2, characterized in that: The overall control system includes a communication module, which establishes a communication connection with the electric energy meter under test. The communication module has a power line carrier and an RF radio signal. During the test, the power line carrier signal spatial conduction and RF radio signal interference are generated to simulate the radio interference in the field environment.

4. The intelligent electric energy meter comprehensive interference test system according to claim 1, characterized in that: The electric energy meter calibration device is equipped with a standard meter and an error meter to measure the electric energy error and clock error of the electric energy meter under test; the electric energy meter calibration device can also output voltage and current through the ARM signal source, and superimpose harmonic signals on the voltage and current loop to simulate the harmonic impact of virtual loads; the variable frequency regulated power supply outputs industrial frequency voltage, and the back end is connected to a real load to simulate the harmonic impact of the real load.

5. The intelligent electric energy meter comprehensive interference test system according to claim 3, characterized in that: The communication module includes an MCU control core, which controls the carrier transceiver module and the RF transceiver module to communicate and interact with the electric energy meter; The communication module has a passive meter reading mode and an active meter reading mode. In the active meter reading mode, continuous communication instructions are used to simulate continuous power line carrier signal spatial conduction and RF radio signal interference.

6. The intelligent electric energy meter comprehensive interference test system according to claim 5, characterized in that: The MCU control core determines the module's transmission power based on adjustable power parameters, combined with voltage fluctuations in field operation and communication module redundancy to adjust the output voltage and peak clipping factor.

7. The intelligent electric energy meter comprehensive interference test system according to claim 1 or 2, characterized in that: The overall control system also includes a data comparison module, which stores pre-test data and post-test data. During the test, all interactive data are encoded according to the protocol format. The data comparison module automatically parses the data through data identifiers based on the protocol format, and automatically compares the data before and after the test to obtain the results.

8. The intelligent electric energy meter comprehensive interference test system according to claim 1, characterized in that: The meter rack is routed through a vertical cable duct, which is close to the back of the electric energy meter under test. During the test, the cable duct is passed with maximum current to simulate the influence of the power frequency magnetic field.

9. The intelligent electric energy meter comprehensive interference test system according to claim 1 or 8, characterized in that: Each electric energy meter to be tested in the meter rack is equipped with an independent meter holder, on which a pulley is provided. The meter holder adjusts its position on the slide rail through the pulley, so that the electric energy meter to be tested fits tightly, and the transformers in the meter affect each other, simulating the leakage magnetic influence in field applications.

10. A comprehensive interference test method for a smart electric energy meter, characterized in that: It includes virtual load interference test and real load interference test; the virtual load interference test steps are: S1: Ambient temperature and humidity simulation: the electric meter is placed in extreme conditions of high temperature Th, low temperature Tl, high temperature and high humidity RH; S2: Input a working voltage lower than the rated voltage to test the impact of electrical stress in the low voltage state, and then input a working voltage higher than the rated voltage to test the impact of electrical stress in the high voltage state; S3: Input a current large enough to put the electric energy meter in a high stress state to test the influence of electrical stress; S4: repeated superposition of harmonic influence; S5: applying power line carrier signal spatial conduction and RF radio signal interference; S6: Apply power frequency magnetic field and leakage magnetic field influence; The real load interference test steps are: S1: Ambient temperature and humidity simulation: the electric meter is placed in extreme conditions of high temperature Th, low temperature Tl, high temperature and high humidity RH; S2: Input Un, the load current is determined according to the connected load; S3: Apply power line carrier signal spatial conduction and RF radio signal interference S4: Apply power frequency magnetic field and leakage magnetic field influence; S5: Connect an AC motor or an AC charging pile to simulate harmonic impact; S6: Connect to the electronic load box to simulate resistive, inductive and capacitive load currents; Among them, Un represents the rated voltage.

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