Full-automatic abnormal EUT equipment (electric energy meter) detection system

Abstract

The invention discloses a full-automatic abnormal EUT equipment (electric energy meter) detection system, and relates to the field of medical care equipment, and the system comprises a detection device which is used for simulating various on-site power-on environments; the communication system is used for realizing communication with EUT equipment (an electric energy meter) and a master station; the automatic switching system controls a multi-path relay through a system command to realize random sequencing output of current A / B / C phase lines and voltage A / B / C / N phase lines, and meanwhile, an anti-short-circuit mechanism is arranged on software and hardware; the identification system is used for judging whether the EUT equipment (electric energy meter) is abnormal or not according to the content of the message replied by the EUT equipment (electric energy meter); a master station system; the invention discloses an anti-misoperation protection system. The test period of the three-phase electric energy meter is greatly shortened through the highly automatic detection process, and compared with traditional manual test, the system can solidify the test scheme and process and effectively reduce negligence and omission of human factors, so that the accuracy and reliability of detection are remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of electric energy meter detection, in particular to a full-automatic abnormal EUT equipment (electric energy meter) detection system. Background Art

[0002] The three-phase energy meter is an important instrument used to measure the energy consumption in a three-phase AC circuit. It is widely used in places such as industry, commerce and large residential areas that require three-phase power supply. It can accurately record the energy usage of each phase and provide a reliable basis for power management and billing. The three-phase energy meter usually adopts an electronic design with the characteristics of high precision, wide range and multi-function. It can display parameters such as voltage, current and power factor in real time, and supports remote communication and data transmission, which is convenient for realizing the automatic management and intelligent monitoring of the power system. In addition, the three-phase energy meter also has an anti-electricity theft function, which can effectively ensure the safety and stability of power supply. With the development of smart grids, three-phase energy meters are gradually moving towards intelligence and networking, playing an increasingly important role in building an efficient, clean and safe modern energy system.

[0003] Three-phase electricity meters have many complex functions. A complete test cycle lasts up to one month. There are inevitably negligence and omissions in the testing process, which leads to many batch problems of three-phase meters. We need a fully automatic detection system that can solidify the test plan and process, reduce human intervention, and improve detection efficiency and accuracy. Summary of the invention

[0004] Based on this, the purpose of the present invention is to provide a fully automatic abnormal EUT equipment (electricity meter) detection system to solve the technical problem that the three-phase electricity meter has more and more complex functions, a complete round of testing cycle is as long as 1 month, and human factors in testing are inevitably negligent and omission, resulting in more batch problems of three-phase meters.

[0005] To achieve the above object, the present invention provides the following technical solution: a fully automatic abnormal EUT device (electricity meter) detection system, comprising

[0006] Detection device: It can communicate with the master station and EUT equipment (electricity meter) at the same time, and has voltage and current output functions to simulate various power-on environments on site;

[0007] The communication system is used to realize the communication with the EUT device (electricity meter) and the main station, ensuring that the data can be accurately transmitted between the EUT device, (electricity meter) and the main station, and ensuring smooth communication and real-time update of information;

[0008] Automatic switching system, through system command control of multiple relays to achieve random sequence output of current A / B / C phase line and voltage A / B / C / N phase line, while setting anti-short circuit mechanism in software and hardware;

[0009] The identification system is used to determine whether there is an abnormality based on the message content replied by the EUT device (electricity meter);

[0010] The master station system is used to store and manage test steps, EUT equipment (electricity meter) communication data and test results, and upload them to the master station to facilitate manual review of problems;

[0011] The anti-maloperation protection system is mainly responsible for monitoring and preventing maloperation of the system during operation, ensuring the safety and accuracy of the detection process, thereby avoiding unnecessary damage to the (electricity meter) or other parts of the system.

[0012] The present invention is further configured such that the detection process of the detection system comprises the following steps:

[0013] S1. Place the EUT device (electricity meter) on the detection device. The master station system communicates with the detection device through RS485Ⅰ and starts the "self-detection" working mode of the detection device. This mode can determine whether the wiring is abnormal when the (electricity meter) is not powered on;

[0014] S2. If there is any "self-test" abnormality, different reminder methods will be used to remind the tester to facilitate maintenance and troubleshooting;

[0015] S3. If there is no abnormality, the master station can communicate with the detection device through RS485Ⅰ, control the switching system of the detection device through commands, and output various combinations of voltage and current in accordance with the preset scheme;

[0016] S4. If there is no abnormality, the master station will test the EUT device (electricity meter) through RS485Ⅱ, infrared and carrier according to the preset plan. The test send message and (electricity meter) reply message are recorded in the master station system, and the reply message of (electricity meter) is compared with the master station preset message to output whether the test item is qualified.

[0017] The present invention is further configured such that the reminder method in S2 includes a buzzer alarm and an error type of the EUT device (electricity meter) replied by the master station to the detection device, and the error type includes a voltage line short circuit, tripping, etc.

[0018] The present invention is further configured such that the detection device is an intelligent power communication terminal.

[0019] The present invention is further configured such that the communication system can be a combination of an integrated carrier communication module, an infrared communication module, and an RS485 communication module.

[0020] The present invention is further configured such that the automatic switching system specifically includes the following process when working:

[0021] A1. System initialization and configuration: Start the system, ensure that all hardware is working properly, load the configuration file, set the initial state of the relay to off, and define the connection rules of the current A / B / C phase line and the voltage A / B / C / N phase line;

[0022] A2. Relay status check: Check the current status of all relays through system commands to ensure that they are in the initial configuration state. If the relay status is abnormal, reset it to ensure that its status is consistent with the configuration;

[0023] A3. Generate random order: Use the random order algorithm to generate the random output order of the current A / B / C phase line and the voltage A / B / C / N phase line, and save the generated random order in the memory for subsequent use in controlling the relay;

[0024] A4. Control relay switching: according to the generated random order, send system commands in sequence to control the corresponding relays to switch. During the switching process, ensure that only one series of relays is actuated at the same time to avoid current short circuit;

[0025] A5. Real-time monitoring and feedback: During the relay switching process, the system monitoring module monitors the output of current and voltage in real time. If abnormal current or voltage is detected, the relay switching is stopped immediately and an alarm signal is issued;

[0026] A6. Set up anti-short circuit mechanism in software and hardware: It can effectively detect and cut off the short circuit current, prevent the equipment from being damaged by short circuit, and at the same time protect the safety of personnel and property, which is an important measure to ensure the stable operation of the system;

[0027] A7: Complete the test and record the data: After completing all randomly ordered current and voltage outputs, the system records the test data, including the measured values ​​of current and voltage, the timestamp of relay switching, etc., and saves the test data to a designated location for subsequent analysis and evaluation.

[0028] The present invention is further configured that the anti-short circuit mechanism in software and hardware in A6 includes:

[0029] Software short-circuit prevention mechanism: short-circuit prevention logic is set in the control software to ensure that multiple relays that may cause short circuits are not closed at the same time during the switching process. If the software detects a potential short-circuit risk, the switching process is automatically interrupted and an alarm signal is issued;

[0030] Hardware anti-short-circuit mechanism, using isolation and current limiting measures in circuit board design, such as using fuses, current limiting resistors, etc. to prevent short circuits caused by excessive current, and adding diodes or other protection elements at the output end of the relay to prevent reverse current or voltage shock.

[0031] The present invention is further configured such that the anti-malfunction protection system includes a voltage and current short-circuit alarm and an anti-short-circuit mechanism.

[0032] The present invention is further configured to alarm for voltage and current short circuits: by detecting the current terminal of the EUT device (electric energy meter), if there is voltage, a buzzer alarms; if no current is applied to the platform body, the tooling detects current and the buzzer alarms.

[0033] The present invention is further configured such that the short circuit prevention mechanism includes the following process:

[0034] After power-on, reset all relays, that is, all relays are disconnected;

[0035] In terms of current, the hardware is implemented through the chip select chip CD4051B. At the same time, only one of the three relays in a series can be activated. The system determines whether the three relays are closed. If one relay is in the closed state, the other two relays are not allowed to be closed.

[0036] In terms of voltage, the hardware measures are the same as those for current. The system first controls the signal to be pulled low, then selects the chip select signal (interval 200ms), and then controls the signal to be pulled high.

[0037] In summary, the present invention mainly has the following beneficial effects: The present invention greatly shortens the test cycle of three-phase electric energy meters through the cooperation among the detection device, communication system, automatic switching system, identification system, master station system and anti-false operation protection system, etc., through a highly automated detection process. Compared with traditional manual testing, this system can solidify the test plan and process, effectively reduce the negligence and omissions of human factors, thereby significantly improving the accuracy and reliability of detection. At the same time, the system integrates a variety of communication modules and automatic switching systems, making the test process more efficient and convenient, providing strong support for the mass production and quality inspection of electric energy meters;

[0038] Through the innovative identification system, the message content replied by the electricity meter can be accurately analyzed and compared with the preset content of the system to quickly determine the possible problems of the electricity meter. This function not only helps to timely discover and repair the embedded software problems of the electricity meter, but also effectively prevent potential safety hazards. In addition, the system also has detailed test records and reporting functions, which is convenient for testers to view and troubleshoot problems, further improving the quality and stability of the electricity meter.

[0039] By integrating the anti-false operation protection system and anti-short circuit mechanism, the current terminal and voltage conditions of the electric energy meter can be monitored in real time during the test, effectively avoiding safety hazards such as voltage and current short circuits. At the same time, the system ensures the stability and safety of the test environment through multiple protection measures in hardware and software. This design not only protects the test equipment and electric energy meter from damage, but also provides a safer and more reliable test environment for testers. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a system principle block diagram of the present invention;

[0041] Figure 2 It is a detection flow chart of the system of the present invention;

[0042] Figure 3 It is a flowchart of the automatic switching system of the present invention;

[0043] Figure 4 This is a schematic diagram of the current A / B / C phase line automatic switching device of the present invention;

[0044] Figure 5 This is the wiring diagram of the electric energy meter of the present invention. DETAILED DESCRIPTION

[0045] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] A fully automatic abnormal EUT equipment (electricity meter) detection system, such as Figure 1-4 Shown, including

[0047] Detection device: It has the function of communicating with the master station and EUT equipment (electric energy meter) at the same time, and has the function of voltage and current output, which is used to simulate various power-on environments on site. The detection device can be an intelligent power communication terminal;

[0048] The communication system is used to realize communication with the EUT device (electricity meter) and the main station, ensure that data can be accurately transmitted between the EUT device, the electric energy meter and the main station, and ensure smooth communication and real-time updating of information. The communication system can be a combination of integrated carrier communication module, infrared communication module, and RS485 communication module. During specific operation, the model of the carrier communication is KQ-100E, which can be used but not limited to this model, the model of the infrared communication module is DMS-GB1-V, which can be used but not limited to this model; the model of the RS485 communication module is UT-6204-PLC, which can be used but not limited to this model.

[0049] Automatic switching system, through system command control of multiple relays to achieve random sequence output of current A / B / C phase line and voltage A / B / C / N phase line, while setting anti-short circuit mechanism in software and hardware;

[0050] The identification system is used to determine whether there is an abnormality based on the message content replied by the EUT device (electricity meter);

[0051] The master station system is used to store and manage test steps, EUT equipment (electricity meter) communication data and test results, and upload them to the master station to facilitate manual review of problems;

[0052] The anti-maloperation protection system is mainly responsible for monitoring and preventing maloperation of the system during operation, ensuring the safety and accuracy of the detection process, thereby avoiding unnecessary damage to the electric energy meter or other parts of the system.

[0053] Furthermore, the detection process of the detection system includes the following steps:

[0054] S1. Place the EUT device (electricity meter) on the detection device. The master station system communicates with the detection device through RS485Ⅰ and starts the "self-detection" working mode of the detection device. This mode can determine whether the wiring is abnormal (such as voltage line short circuit, etc.) when the energy meter is not powered on.

[0055] S2. If there is an abnormality in "self-detection", the buzzer will alarm, and the master station will receive the error type (voltage line short circuit, tripping, etc.) of the EUT device (electricity meter) replied by the detection device, which is convenient for the test personnel to check and troubleshoot;

[0056] S3. If there is no abnormality, the master station can communicate with the detection device through RS485Ⅰ, control the switching system of the detection device through commands, and output various combinations of voltage and current in accordance with the preset scheme (such as: output A phase voltage 220V, output A phase current, and no output for other phases);

[0057] S4. If there is no abnormality, the master station will test the EUT device (electricity meter) through RS485Ⅱ, infrared and carrier according to the preset plan. The test send message and the electricity meter reply message are recorded in the master station system (to facilitate the test personnel to view and troubleshoot problems), and the reply message of the electricity meter is compared with the preset message of the master station to output whether the test item is qualified.

[0058] For example, if the standard electricity consumption of the energy meter in one hour is preset to be 3.3±0.03kWh, and the actual electricity consumption in the reply message of the energy meter is 3.402kWh, then it is judged as unqualified.

[0059] The problem with the above preset plan: the detection device in the plan first added phase A voltage (220V) to terminal 2 of the electricity meter. In the subsequent test process, the plan did not remove the phase A voltage (220V) applied to terminal 2, but directly added phase B voltage (220V) to terminal 2. At this time, the output plan was abnormal - the voltage was short-circuited; similarly, the detection device in the plan first added phase A current input line to terminal 1 of the electricity meter, and phase A current output line to terminal 3. In the subsequent test process, the plan did not remove the phase A current applied to terminals 1 and 3, but directly added phase B current to terminals 1 and 3. At this time, the output plan was abnormal - the current was short-circuited.

[0060] Specifically, the automatic switching system includes the following processes when working:

[0061] A1. System initialization and configuration: Start the system, ensure that all hardware (including multi-channel relays, circuit boards, power supplies, etc.) work properly, load the configuration file, set the initial state of the relay to off, and define the connection rules of the current A / B / C phase line and the voltage A / B / C / N phase line;

[0062] A2. Relay status check: Check the current status of all relays through system commands to ensure that they are in the initial configuration state. If the relay status is abnormal, reset it to ensure that its status is consistent with the configuration;

[0063] A3. Generate random order: Use a random ordering algorithm to generate a random output order of current A / B / C phase lines and voltage A / B / C / N phase lines, and save the generated random order in memory for subsequent use in controlling the relay. The random ordering algorithm can use Fisher-Yates shuffle algorithm, random selection sort, randomized quick sort, etc.

[0064] A4. Control relay switching: according to the generated random order, send system commands in sequence to control the corresponding relays to switch. During the switching process, ensure that only one series of relays is actuated at the same time (for example, when switching the current phase line, ensure that the A, B, and C phase lines are not switched at the same time) to avoid current short circuit;

[0065] A5. Real-time monitoring and feedback: During the relay switching process, the system monitoring module monitors the output of current and voltage in real time. If abnormal current or voltage is detected (such as excessive current, voltage fluctuation, etc.), the relay switching is stopped immediately and an alarm signal is issued;

[0066] A6. Set up anti-short-circuit mechanism in software and hardware: It can effectively detect and cut off short-circuit current, prevent equipment from being damaged by short circuit, and at the same time protect the safety of personnel and property, which is an important measure to ensure the stable operation of the system. The software anti-short-circuit mechanism sets anti-short-circuit logic in the control software to ensure that multiple relays that may cause short circuits are not closed at the same time during the switching process. If the software detects a potential short-circuit risk, it automatically interrupts the switching process and sends out an alarm signal. The hardware anti-short-circuit mechanism adopts isolation and current limiting measures in the circuit board design, such as using fuses, current limiting resistors, etc. to prevent short circuits caused by excessive current. Diodes or other protection elements are added to the output of the relay to prevent reverse current or voltage shocks.

[0067] A7: Complete the test and record the data: After completing all randomly ordered current and voltage outputs, the system records the test data, including the measured values ​​of current and voltage, the timestamp of relay switching, etc., and saves the test data to a designated location for subsequent analysis and evaluation.

[0068] Furthermore, the anti-maloperation protection system includes a voltage and current short-circuit alarm and an anti-short-circuit mechanism. The voltage and current short-circuit alarm: by detecting the current terminal of the EUT device (electricity meter), if there is voltage, the buzzer alarms; if no current is added to the platform body, the tooling detects the current and the buzzer alarms; the anti-short-circuit mechanism resets all relays after power-on, that is, all relays are disconnected; in terms of current, the hardware is implemented through the chip select chip CD4051B. At the same time, only one of the three groups of relays in a series (such as all entering the A phase current of the EUT device) can operate. The system determines whether the three groups of relays are closed. If one group of relays is in the closed state, the other two groups of relays are not allowed to be closed; in terms of voltage, the hardware measures are the same as those for current. The system first controls the signal to be pulled low, then selects the chip select signal (interval 200ms), and then controls the signal to be pulled high.

[0069] Although an embodiment of the present invention has been shown and described, this specific embodiment is merely an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contributions as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A fully automatic abnormal EUT equipment (electricity meter) detection system, characterized in that: include Detection device: It can communicate with the master station and EUT equipment (electricity meter) at the same time, and has voltage and current output functions to simulate various power-on environments on site; The communication system is used to realize the communication with the EUT device (electricity meter) and the main station, ensuring that the data can be accurately transmitted between the EUT device, (electricity meter) and the main station, and ensuring smooth communication and real-time update of information; Automatic switching system, through system command control of multiple relays to achieve random sequence output of current A / B / C phase line and voltage A / B / C / N phase line, while setting anti-short circuit mechanism in software and hardware; The identification system is used to determine whether there is an abnormality based on the message content replied by the EUT device (electricity meter); The master station system is used to store and manage test steps, EUT equipment (electricity meter) communication data and test results, and upload them to the master station to facilitate manual review of problems; The anti-maloperation protection system is mainly responsible for monitoring and preventing maloperation of the system during operation, ensuring the safety and accuracy of the detection process, thereby avoiding unnecessary damage to the (electricity meter) or other parts of the system.

2. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 1, characterized in that: The detection process of the detection system includes the following steps: S1. Place the EUT device (electricity meter) on the detection device. The master station system communicates with the detection device through RS485Ⅰ and starts the "self-detection" working mode of the detection device. This mode can determine whether the wiring is abnormal when the (electricity meter) is not powered on; S2. If there is any "self-test" abnormality, different reminder methods will be used to remind the tester to facilitate inspection and troubleshooting; S3. If there is no abnormality, the master station can communicate with the detection device through RS485Ⅰ, control the switching system of the detection device through commands, and output various combinations of voltage and current in accordance with the preset scheme; S4. If there is no abnormality, the master station will test the EUT device (electricity meter) through RS485Ⅱ, infrared and carrier according to the preset plan. The test send message and (electricity meter) reply message are recorded in the master station system, and the reply message of (electricity meter) is compared with the master station preset message to output whether the test item is qualified.

3. A fully automatic abnormal EUT equipment (electric energy meter) detection system according to claim 2, characterized in that: The reminder method in S2 includes a buzzer alarm and the error type of the EUT device (electricity meter) replied by the master station to the detection device, and the error type includes a voltage line short circuit, tripping, etc.

4. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 1, characterized in that: The detection device is an intelligent power communication terminal.

5. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 1, characterized in that: The communication system can be a combination of an integrated carrier communication module, an infrared communication module, and an RS485 communication module.

6. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 1, characterized in that: The automatic switching system specifically includes the following processes when working: A1. System initialization and configuration: Start the system, ensure that all hardware is working properly, load the configuration file, set the initial state of the relay to off, and define the connection rules of the current A / B / C phase line and the voltage A / B / C / N phase line; A2. Relay status check: Check the current status of all relays through system commands to ensure that they are in the initial configuration state. If the relay status is abnormal, reset it to ensure that its status is consistent with the configuration; A3. Generate random order: Use the random order algorithm to generate the random output order of the current A / B / C phase line and the voltage A / B / C / N phase line, and save the generated random order in the memory for subsequent use in controlling the relay; A4. Control relay switching: according to the generated random order, send system commands in sequence to control the corresponding relays to switch. During the switching process, ensure that only one series of relays is actuated at the same time to avoid current short circuit; A5. Real-time monitoring and feedback: During the relay switching process, the system monitoring module monitors the output of current and voltage in real time. If abnormal current or voltage is detected, the relay switching is stopped immediately and an alarm signal is issued; A6. Set up anti-short circuit mechanism in software and hardware: It can effectively detect and cut off the short circuit current, prevent the equipment from being damaged by short circuit, and at the same time protect the safety of personnel and property, which is an important measure to ensure the stable operation of the system; A7: Complete the test and record the data: After completing all randomly ordered current and voltage outputs, the system records the test data, including the measured values ​​of current and voltage, the timestamp of relay switching, etc., and saves the test data to a designated location for subsequent analysis and evaluation.

7. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 6, characterized in that: The anti-short circuit mechanism in software and hardware of A6 includes: Software short-circuit prevention mechanism: short-circuit prevention logic is set in the control software to ensure that multiple relays that may cause short circuits are not closed at the same time during the switching process. If the software detects a potential short-circuit risk, the switching process is automatically interrupted and an alarm signal is issued; Hardware anti-short-circuit mechanism, using isolation and current limiting measures in circuit board design, such as using fuses, current limiting resistors, etc. to prevent short circuits caused by excessive current, and adding diodes or other protection elements at the output end of the relay to prevent reverse current or voltage shock.

8. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 1, characterized in that: The anti-malfunction protection system includes a voltage and current short-circuit alarm and an anti-short-circuit mechanism.

9. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 8, characterized in that: Voltage and current short circuit alarm: By detecting the current terminal of the EUT equipment (electricity meter), if there is voltage, the buzzer will alarm; if there is no current on the table body, the tooling detects current and the buzzer will alarm.

10. A fully automatic abnormal EUT device (electric energy meter) detection system according to claim 9, characterized in that: The short circuit prevention mechanism includes the following processes: After power-on, reset all relays, that is, all relays are disconnected; In terms of current, the hardware is implemented through the chip select chip CD4051B. At the same time, only one of the three relays in a series can be activated. The system determines whether the three relays are closed. If one relay is in the closed state, the other two relays are not allowed to be closed. In terms of voltage, the hardware measures are the same as those for current. The system first controls the signal to be pulled low, then selects the chip select signal (interval 200ms), and then controls the signal to be pulled high.

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