The load error detection system of the table isolation transformer of the assembly line measurement and verification device

Abstract

The invention discloses a load error detection system for a table position isolation transformer of an assembly line metrology and verification device, comprising: a first single-phase standard meter connected to a pulse output interface and a voltage and current interface of the assembly line metrology and verification device, a second single-phase standard meter installed at the table position of the assembly line metrology and verification device, a wireless data transmission module communicatively connected to the first single-phase standard meter and the second single-phase standard meter, and a data analysis module communicatively connected to the wireless data transmission module; when error detection of the table position isolation transformer after loading is performed, the assembly line metrology and verification device raises voltage and current and sends out a pulse signal, the first single-phase standard meter and the second single-phase standard meter respectively detect pulse data of the assembly line metrology and verification device and the table position isolation transformer after loading, the wireless data transmission module receives the detected pulse data and sends it to the data analysis module, and the data analysis module obtains the error detection result of the table position isolation transformer after loading according to the pulse data.

Description

Technical Field

[0001] The invention relates to the technical field of standard meter detection, in particular to a load error detection system for a meter position isolation transformer of an assembly line measurement and verification device. Background Art

[0002] At present, all metrological verification institutions are equipped with automated verification line metrological verification devices. According to the verification system, the verification cycle is one year. If a meter position error occurs during two verification cycles, all smart energy meters measured during this period will be traced back, and the installed smart energy meters will be dismantled and re-inspected. Due to the huge daily meter inspection volume of the assembly line and the extremely fast meter inspection process, if the problematic meter position is not discovered in time, it will cause huge losses in manpower, financial resources and material resources.

[0003] According to the original verification method, only standard electric energy meters or no-load random inspection meters can no longer fully guarantee the accuracy of each meter in the automatic verification system of smart electric energy meters. The error accuracy of the verification system is not only affected by external factors such as the working environment and vibration, but also by factors such as the load capacity of the isolation transformer at different meters, the state of the short-circuit relay, and the contact resistance of the wire pressing mechanism. At present, the detection department uses ordinary standard electric energy meters to check the meters one by one when the meter is shut down and no-load, which cannot accurately detect the real status of these meters after loading.

[0004] In summary, there is an urgent need for a technical solution that can overcome the above shortcomings, accurately detect the error of the meter isolation transformer after loading, and determine whether the meter works normally. Summary of the invention

[0005] The present invention discloses a load error detection system for a meter isolation transformer of an assembly line metering and calibration device. Through the combination of a single-phase standard meter and a wireless data transmission module, pulse error and daily timing error detection, line harmonic analysis and electrical quantity error comparison are performed online and remotely, thereby being able to more accurately measure the actual situation of the electric energy meter in use and monitor the long-term operating stability of the electric energy meter.

[0006] Specifically, the system includes: a first single-phase standard meter, a second single-phase standard meter, an assembly line measurement and verification device, a wireless data transmission module and a data analysis module; wherein,

[0007] The first single-phase standard meter is connected to the pulse output interface and the voltage and current interface of the assembly line measurement and verification device, the second single-phase standard meter is installed at the table position of the assembly line measurement and verification device, the wireless data transmission module is communicatively connected with the first single-phase standard meter and the second single-phase standard meter, and the data analysis module is communicatively connected with the wireless data transmission module;

[0008] When performing error detection on the load-bearing isolation transformer, the assembly line measurement and verification device raises the voltage and current and sends out a pulse signal. The first single-phase standard meter and the second single-phase standard meter respectively detect the pulse data of the assembly line measurement and verification device and the load-bearing isolation transformer. The wireless data transmission module receives the detected pulse data and sends it to the data analysis module. The data analysis module obtains the error detection result of the load-bearing isolation transformer based on the pulse data.

[0009] Furthermore, the voltage measurement range of the first single-phase standard meter and the second single-phase standard meter is 0-400V, the current measurement range is 0.1A-100A, and the accuracy is 0.02 level.

[0010] Furthermore, the assembly line metrology and calibration device includes a standard meter, a meter position isolation transformer and a meter position; wherein, the standard meter is connected to the first single-phase standard meter and the meter position isolation transformer, the detection accuracy of the standard standard is level 0.1, the meter position isolation transformer is correspondingly provided with multiple meter positions, the accuracy of the meter position isolation transformer is level 0.05, and the meter position is used to install the second single-phase standard meter.

[0011] Furthermore, the first single-phase standard meter is connected to the back end of the standard meter in a current series and voltage parallel manner, and the pulse signal of the standard meter is directly connected to the first single-phase standard meter;

[0012] The pulse signal of the standard meter is also connected to the second single-phase standard meter through the meter position isolation transformer and the meter position.

[0013] Furthermore, the wireless data transmission module is an RS485 communication module, a Bluetooth communication module, a 3G module, a 4G module, a 5G module or a combination of the above modules.

[0014] Furthermore, the data analysis module is a computer.

[0015] Furthermore, the wireless data transmission module transmits data with the first single-phase standard meter and the second single-phase standard meter via RS485 communication or Bluetooth communication, and accesses a local wireless network to transmit data with a computer.

[0016] Furthermore, when the system is used to perform error detection on the load-bearing isolation transformer, it also includes:

[0017] The test voltage and test current are raised by the assembly line measurement and verification device, the power factor is set, the first single-phase standard meter and the second single-phase standard meter start working, the wireless data transmission module receives the pulse data detected by the two single-phase standard meters and sends it to the data analysis module. After the power is stable, the data analysis module obtains the error detection result of the table position isolation transformer after loading according to the pulse data; wherein, the error detection result is obtained according to the following formula:

[0018] R=(R1+R2+…+R n ) / n, where R is the error detection result of the isolation transformer after loading; R1, R2, ..., R n are n error detection results measured by two single-phase standard meters;

[0019] Adjust the meter position where the second single-phase standard meter is installed, and perform error detection on each meter position isolation transformer after it is loaded, and obtain the error detection results of each meter position isolation transformer after it is loaded;

[0020] If |R| is less than the error threshold, the error of the table position isolation transformer after being loaded is determined to be qualified. If |R| is greater than or equal to the error threshold, the error of the table position isolation transformer after being loaded is determined to be unqualified.

[0021] Furthermore, the test voltage is 220V, and the test current is 5A, 20A and 60A.

[0022] Furthermore, when the system is used to perform error detection on the load-bearing isolation transformer, it also includes:

[0023] According to the preset test time, the test voltage of 220V and the test current of 5A, the test voltage of 220V and the test current of 20A, and the test voltage of 220V and the test current of 60A are used respectively to perform error detection on the current table isolation transformer after being loaded, and the error detection result is obtained.

[0024] The load error detection system of the table position isolation transformer of the assembly line metrology and verification device proposed by the present invention consists of a single-phase standard meter, an assembly line metrology and verification device, a wireless data transmission module and a data analysis module, a single-phase standard meter is connected in series to the rear end of the device standard meter, a single-phase standard meter is installed at the measured table position of the device, and the pulse output interface of the device standard meter is respectively connected to the two single-phase standard meters; when performing error detection, the device raises the voltage and current, reads the two single-phase standard meters through the wireless data transmission module to detect the error of the device standard meter, and calculates the error difference of different current points of the two different single-phase standard meters through the data analysis module to obtain the load error of the table position isolation transformer; through the combination of the single-phase standard meter, the wireless data transmission module and the data analysis system, the error detection and analysis of the isolation transformers at different table positions of the device when they are working under load can be realized, thereby accurately measuring the load capacity of the table position isolation transformer of the device, and timely discovering equipment abnormalities caused by insufficient load capacity or failure of the table position isolation transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 It is a schematic diagram of the architecture of a load error detection system for a table isolation transformer of an assembly line metrology and verification device according to an embodiment of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of a production line measurement and verification device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The principles and spirit of the present invention will be described below with reference to several exemplary embodiments. It should be understood that these embodiments are provided only to enable those skilled in the art to better understand and implement the present invention, and are not intended to limit the scope of the present invention in any way. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0029] According to an embodiment of the present invention, a load error detection system for a meter position isolation transformer of an assembly line metrology and calibration device is proposed, the system comprising: two single-phase standard meters, one of which is connected in series to the rear end of the device standard meter, and the other is installed at the device's measured meter position, and the pulse output interface of the device standard meter is respectively connected to the two single-phase standard meters; when performing error detection, the device raises the voltage and current, and reads the error of the device standard meter through the wireless data transmission module, and calculates the error difference of different current points of the two different single-phase standard meters through the data analysis system, and the average value is the load error of the isolation transformer of a certain meter position of the device, so as to judge whether the meter position is qualified after being loaded with the isolation transformer, and grasp the working status of each table of the automated calibration assembly line metrology and calibration device in real time.

[0030] The principle and spirit of the present invention are explained in detail below with reference to several representative embodiments of the present invention.

[0031] refer to Figure 1 , is a schematic diagram of the architecture of a load error detection system for an isolation transformer of a production line measurement and verification device according to an embodiment of the present invention. Figure 1 As shown, the system includes: a first single-phase standard meter 1, a second single-phase standard meter 2, an assembly line measurement and verification device 3, a wireless data transmission module 4 and a data analysis module 5; wherein,

[0032] The first single-phase standard meter 1 is connected to the pulse output interface and the voltage and current interface of the assembly line measurement and verification device 3, the second single-phase standard meter 2 is installed at the table position of the assembly line measurement and verification device 3, the wireless data transmission module 4 is connected to the first single-phase standard meter 1 and the second single-phase standard meter 2 in communication, and the data analysis module 5 is connected to the wireless data transmission module 4 in communication;

[0033] When performing error detection on the load-bearing isolation transformer, the assembly line measurement and calibration device 3 raises the voltage and current and sends out a pulse signal, the first single-phase standard meter 1 and the second single-phase standard meter 2 respectively detect the pulse data of the assembly line measurement and calibration device 3 and the load-bearing isolation transformer, the wireless data transmission module 4 receives the detected pulse data and sends it to the data analysis module 5, and the data analysis module 5 obtains the error detection result of the load-bearing isolation transformer according to the pulse data.

[0034] Specifically, when the system is used to detect the error of the table isolation transformer after loading, the detailed process is as follows:

[0035] Step S1, the assembly line measurement and verification device 3 raises the test voltage and test current, and sets the power factor; the first single-phase standard meter 1 and the second single-phase standard meter 2 start working; wherein, the test voltage is 220V, and the test current is 5A, 20A and 60A.

[0036] During the test process, according to the preset test time (for example, the time for each test point is 5 minutes, and the total time for detecting the three test points 5A, 20A, and 60A is 15 minutes), the error detection of the current table isolation transformer after loading can be carried out using test voltage 220V and test current 5A, test voltage 220V and test current 20A, and test voltage 220V and test current 60A respectively.

[0037] Step S2, the wireless data transmission module 4 receives the pulse data detected by the two single-phase standard meters and sends it to the data analysis module 5. After the power is stable, the data analysis module 5 obtains the error detection result of the meter isolation transformer under load based on the pulse data.

[0038] Among them, the error detection result is obtained according to the following formula:

[0039] R=(R1+R2+…+R n ) / n, where R is the error detection result of the isolation transformer after loading; R1, R2, ..., R n are the n error detection results measured by two single-phase standard meters.

[0040] Step S3, adjusting the meter position installed by the second single-phase standard meter 2, repeating steps S1 and S2, and sequentially performing error detection on each meter position isolation transformer after loading, and obtaining the error detection results of each meter position isolation transformer after loading;

[0041] If |R| is less than the error threshold, the error of the table position isolation transformer after being loaded is determined to be qualified. If |R| is greater than or equal to the error threshold, the error of the table position isolation transformer after being loaded is determined to be unqualified.

[0042] The following is a detailed description of each device in the system:

[0043] The voltage measurement range of the first single-phase standard meter 1 and the second single-phase standard meter 2 is 0-400V, the current measurement range is 0.1A-100A, and the accuracy is 0.02 level. The single-phase standard meter has RS485 communication and Bluetooth communication functions, measurement functions and data microprocessing functions. Among them, the communication function is used to upload the single-phase standard meter data to the wireless data transmission module; the measurement function is used to measure the pulse error of the device; the data microprocessing function is used to calculate and process the pulse error.

[0044] refer to Figure 2 , is a schematic diagram of the structure of a production line measurement and verification device according to an embodiment of the present invention. Figure 2 As shown, the assembly line measurement and calibration device 3 includes a standard meter, a meter position isolation transformer and a meter position; wherein, the standard meter is connected to the first single-phase standard meter 1 and the meter position isolation transformer, the detection accuracy of the standard standard is level 0.1, and the meter position isolation transformer is correspondingly provided with multiple meter positions, the accuracy of the meter position isolation transformer is level 0.05, and the meter position is used to install the second single-phase standard meter 2.

[0045] Among them, the first single-phase standard meter 1 is connected to the back end of the standard meter in the form of current series and voltage parallel, and the pulse signal of the standard meter is directly connected to the first single-phase standard meter 1; the pulse signal of the standard meter is also connected to the second single-phase standard meter 2 through the meter position isolation transformer and the meter position.

[0046] The wireless data transmission module 4 is an RS485 communication module, a Bluetooth communication module, a 3G module, a 4G module, a 5G module or a combination of the above modules.

[0047] The data analysis module 5 is a computer, which can be a PC or a laptop computer installed with data analysis software.

[0048] The wireless data transmission module 4 transmits data with the first single-phase standard meter 1 and the second single-phase standard meter 2 via RS485 communication or Bluetooth communication, and accesses a local wireless network to transmit data with a computer.

[0049] In order to explain more clearly the load error detection system of the table isolation transformer of the above-mentioned assembly line measurement and calibration device, it is described below in conjunction with a specific embodiment. However, it is worth noting that this embodiment is only for better illustrating the present invention and does not constitute an improper limitation to the present invention.

[0050] First, build the table isolation transformer load error detection system of the assembly line measurement and verification device, including:

[0051] Two single-phase installed standard electricity meters (hereinafter referred to as "single-phase standard meters"): 220V, 0.1A-100A, 0.02 level.

[0052] 1 set of automated calibration line metrological calibration device (hereinafter referred to as "device"): It consists of a standard meter, a meter position isolation transformer and a meter position. The accuracy level of the device is 0.1, and the accuracy level of the isolation transformer is 0.05.

[0053] 1 wireless data transmission module: DC 5V power supply, dual USB interface, Bluetooth module, WIFI module.

[0054] 1 computer: equipped with data analysis system.

[0055] The current of the first installed standard meter is connected in series and the voltage is connected in parallel to the rear end of the standard meter of the device. At the same time, the high-frequency pulse of the standard meter of the device is connected to the first installed standard meter.

[0056] The second mounted standard meter is connected to the first meter position of the device, and the pulse of the standard meter of the device is directly connected to the second mounted standard meter after being modified.

[0057] The wireless data transmission module is connected to a 5V power supply, and the Bluetooth addresses of the two mounted standard meters are set through the setting software to realize Bluetooth communication between the wireless data transmission module and the mounted standard meter. At the same time, the wireless data transmission module is connected to the local wireless network to realize the wireless LAN connection with the computer.

[0058] Turn on the computer and run the data analysis software.

[0059] During the test, the device raised the voltage to 220V, the current (the test current was 5A, 20A, and 60A, each test point was about 5 minutes, and the total was about 15 minutes), the power factor was 1.0, and the two installed standard electricity meters started working directly. After the power stabilized, the device's own error and the error of the meter isolation transformer under load were tested respectively.

[0060] The wireless data transmission module uploads the instantaneous quantity parameters and the original values ​​and rounded values ​​of the basic errors measured by the two mounted standard meters to the computer, and obtains the error difference of the meter position isolation transformer after being loaded through calculation.

[0061] Adjust the second mounted standard electric energy meter to the next meter position, and obtain the error of the isolation transformer at each meter position in turn. If the error value is less than 0.05%, it is considered that the error of the isolation transformer is qualified after loading, thereby judging the load capacity of the isolation transformer.

[0062] In this embodiment, the error threshold is related to the accuracy level of the isolation transformer. The accuracy levels of common isolation transformers used in automated calibration line metrology and calibration devices are 0.05% and 0.1%, that is, the threshold of R can be set to 0.05% or 0.1% (the threshold is set according to the nominal accuracy level of the isolation transformer).

[0063] The load error detection system of the table position isolation transformer of the assembly line metrology and verification device proposed by the present invention consists of a single-phase standard meter, an assembly line metrology and verification device, a wireless data transmission module and a data analysis module, a single-phase standard meter is connected in series to the rear end of the device standard meter, a single-phase standard meter is installed at the measured table position of the device, and the pulse output interface of the device standard meter is respectively connected to the two single-phase standard meters; when performing error detection, the device raises the voltage and current, reads the two single-phase standard meters through the wireless data transmission module to detect the error of the device standard meter, and calculates the error difference of different current points of the two different single-phase standard meters through the data analysis module to obtain the load error of the table position isolation transformer; through the combination of the single-phase standard meter, the wireless data transmission module and the data analysis system, the error detection and analysis of the isolation transformers at different table positions of the device when they are working under load can be realized, thereby accurately measuring the load capacity of the table position isolation transformer of the device, and timely discovering equipment abnormalities caused by insufficient load capacity or failure of the table position isolation transformer.

[0064] The above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, those skilled in the art should understand that any person skilled in the art can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or perform equivalent replacements on some of the technical features thereof; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A load error detection system for the table isolation transformer of an assembly line measurement and verification device, characterized in that: The system comprises: a first single-phase standard meter (1), a second single-phase standard meter (2), an assembly line measurement and verification device (3), a wireless data transmission module (4) and a data analysis module (5); wherein: The first single-phase standard meter (1) is connected to the pulse output interface and the voltage and current interface of the assembly line measurement and verification device (3), the second single-phase standard meter (2) is installed at the meter position of the assembly line measurement and verification device (3), the wireless data transmission module (4) is communicatively connected to the first single-phase standard meter (1) and the second single-phase standard meter (2), and the data analysis module (5) is communicatively connected to the wireless data transmission module (4); The voltage measurement range of the first single-phase standard meter (1) and the second single-phase standard meter (2) is 0-400V, the current measurement range is 0.1A-100A, and the accuracy is 0.02 level; When performing error detection on the load-bearing isolation transformer, the assembly line measurement and verification device (3) raises the voltage and current and sends out a pulse signal, the first single-phase standard meter (1) and the second single-phase standard meter (2) respectively detect the pulse data of the assembly line measurement and verification device (3) and the load-bearing isolation transformer, the wireless data transmission module (4) receives the detected pulse data and sends it to the data analysis module (5), and the data analysis module (5) obtains the error detection result of the load-bearing isolation transformer according to the pulse data; Among them, when the error detection of the table position isolation transformer after loading is carried out, it also includes: The test voltage and the test current are raised by the assembly line measurement and verification device (3), the power factor is set, the first single-phase standard meter (1) and the second single-phase standard meter (2) start working, the wireless data transmission module (4) receives the pulse data detected by the two single-phase standard meters and sends it to the data analysis module (5), after the power is stabilized, the data analysis module (5) obtains the error detection result of the table position isolation transformer after loading according to the pulse data; wherein the error detection result is obtained according to the following formula: R=(R1+R2+…+R n ) / n, where R is the error detection result of the isolation transformer after loading; R1, R2, ..., R n are n error detection results measured by two single-phase standard meters; Adjust the meter position where the second single-phase standard meter (2) is installed, and perform error detection on each meter position isolation transformer after it is loaded, and obtain the error detection results of each meter position isolation transformer after it is loaded; If |R| is less than the error threshold, the error of the table position isolation transformer after being loaded is determined to be qualified. If |R| is greater than or equal to the error threshold, the error of the table position isolation transformer after being loaded is determined to be unqualified.

2. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 1 is characterized in that: The assembly line measurement and calibration device (3) comprises a standard meter, a meter position isolation transformer and a meter position; wherein the standard meter is connected to the first single-phase standard meter (1) and the meter position isolation transformer, the detection accuracy of the standard standard is 0.1 level, the meter position isolation transformer is correspondingly provided with a plurality of meter positions, the accuracy of the meter position isolation transformer is 0.05 level, and the meter position is used to install the second single-phase standard meter (2).

3. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 2 is characterized in that: The first single-phase standard meter (1) is connected to the back end of the standard meter in a current series and voltage parallel manner, and the pulse signal of the standard meter is directly connected to the first single-phase standard meter (1); The pulse signal of the standard meter is also connected to the second single-phase standard meter (2) through the meter position isolation transformer and the meter position.

4. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 1 is characterized in that: The wireless data transmission module (4) is an RS485 communication module, a Bluetooth communication module, a 3G module, a 4G module, a 5G module or a combination of the above modules.

5. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 4 is characterized in that: The data analysis module (5) is a computer.

6. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 4 is characterized in that: The wireless data transmission module (4) performs data transmission with the first single-phase standard meter (1) and the second single-phase standard meter (2) via RS485 communication or Bluetooth communication, and is connected to a local wireless network to perform data transmission with a computer.

7. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 1 is characterized in that: The test voltage is 220V, and the test current is 5A, 20A and 60A.

8. The load error detection system for the table isolation transformer of the assembly line measurement and verification device according to claim 7 is characterized in that: When the system is used to detect the error of the table position isolation transformer after loading, it also includes: According to the preset test time, the test voltage of 220V and the test current of 5A, the test voltage of 220V and the test current of 20A, and the test voltage of 220V and the test current of 60A are used respectively to perform error detection on the current table isolation transformer after being loaded, and the error detection result is obtained.

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