CN112946556A - Electric energy metering accuracy on-site calibration instrument and method - Google Patents
Electric energy metering accuracy on-site calibration instrument and method Download PDFInfo
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- CN112946556A CN112946556A CN202011621940.4A CN202011621940A CN112946556A CN 112946556 A CN112946556 A CN 112946556A CN 202011621940 A CN202011621940 A CN 202011621940A CN 112946556 A CN112946556 A CN 112946556A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
Abstract
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering accuracy field calibrator and a using method thereof.A power sensor is connected with a three-phase line in a power distribution cabinet, the power sensor is connected with a controller through the three-phase line, the controller is connected with a socket through the three-phase line, and the socket is connected with a simulation load through the three-phase line; the shell is also internally provided with a data processing unit, and the data processing unit receives the data of the electric quantity sensor and is used for controlling the on-off of the controller; the remote wireless transmitting device reads the data of the detected electric energy meter in the power distribution cabinet through 485 communication, the remote wireless transmitting device is in wireless communication with the remote wireless receiving device, and the data processing unit is connected with the remote wireless receiving device; the shell is also provided with a display and a key, and the data processing unit is respectively connected with the display and the key; the comprehensive uncertainty of the detected electric energy meter can be judged through the wide-range high-precision standard meter so as to judge whether the transformer has a wrong transformation ratio or a wrong line impedance or a wrong wiring.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to an electric energy metering accuracy on-site calibration instrument and method.
Background
The watt-hour meter for trade settlement is a legal measuring instrument, and its mutual inductor, connecting wire and electric resistor are matched to influence the accuracy of measurement.
According to the regulation of No. 4.2.2 item e of the inspection Specification for electric energy metering devices issued by the department of electric Power: the field load power should be the actual constant load. When the load current is lower than 10% of the calibrated current of the detected electric energy meter or the power factor is lower than 0.5, the error detection is not suitable. However, the electric energy meter cannot be calibrated when the following problems are encountered:
1. some enterprises have stopped production and are in the beginning or the production scale is sharply reduced, so that the power load is extremely small;
2. the electric energy meter installed on the standby circuit or the bypass has no load for a long time;
3. the line load of a place where a newly built cell does not live and the live-in rate is low is too small for a while;
4. the transformer has wrong transformation ratio, wrong wiring and poor contact;
5. and newly-built facilities such as newly-built factories, schools, markets and the like are accessed into the metering electric energy meter in a no-load mode.
The situation can lead to the electric energy meter not to walk, and backward walk or walk under the very big error condition, and the scene can't discover, wait to be qualified for the next round of competitions high line loss, influence system measurement, and the measurement personnel test customer's metering device many times just can discover the problem, cause a large amount of manpower, material resources cost to improve, still can cause the electric quantity loss, directly endanger electric power enterprise's economic benefits.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the comprehensive uncertainty of the detected electric energy meter is judged through a wide-range high-precision standard meter so as to judge whether the transformer transformation ratio is wrong or the line impedance is wrong or the wiring is wrong.
In order to solve the existing technical problems, the invention carries out the following technical scheme design: the field calibrator for the electric energy metering accuracy comprises a shell, wherein an electric quantity sensor is arranged in the shell and is connected with a three-phase line in a power distribution cabinet, the electric quantity sensor is connected with a controller through the three-phase line, the controller is connected with a socket through the three-phase line, and the socket is connected with an analog load through the three-phase line;
the shell is also internally provided with a data processing unit, and the data processing unit receives the data of the electric quantity sensor and is used for controlling the on-off of the controller;
the remote wireless transmitting device reads the data of the detected electric energy meter in the power distribution cabinet through 485 communication, the remote wireless transmitting device is in wireless communication with the remote wireless receiving device, and the data processing unit is connected with the remote wireless receiving device;
the shell is also provided with a display and a key, and the data processing unit is respectively connected with the display and the key.
The electric quantity sensor adopts a standard electric energy meter with high precision, high wide range, the range of the standard electric energy meter can be in the range of 0.1A-5000A, and the precision can be in the level of 0.1. The controller is used for controlling the on-off of the circuit, then the small load is used for driving the standard electric energy meter to work, the standard electric energy meter reads accurate data and then displays the data on the display, meanwhile, the data of the detected electric energy meter is displayed on the display, the problem can be judged manually between the standard electric energy meter and the display, and the problem can also be judged after the data are processed by the data processing unit. And resetting the key after each judgment, and carrying out next calibration work.
Preferably, the data processing unit is controlled by the wireless communication module and the mobile phone app; the wireless communication module comprises a main control module, an APP module, a Bluetooth module and an expansion interface module; the mobile phone app is connected with a background server, and the background server is stored in the platform system.
After the data are transmitted to the mobile phone app, a user can upload and store the screenshot and can call background data to achieve the purpose of data collection.
Preferably, the electric quantity sensor comprises a through type three-phase alternating current sampling mechanism and a three-phase metering mechanism, the through type three-phase alternating current sampling mechanism is connected with a three-phase power line in the power distribution cabinet, the output end of the through type three-phase alternating current sampling mechanism is connected with the input end of the three-phase metering mechanism, and the output end of the three-phase metering mechanism is connected with the input end of the data processing unit; the three through single-phase alternating current sampling mechanisms respectively sample each phase of a three-phase power line, so that electricity utilization states and phase information of three phases can be conveniently collected, micro signals are output to the three-phase metering mechanism, the three-phase metering mechanism carries out data processing, and the processed data are transmitted to the processor for judgment and comparison.
Preferably, the penetration type single-phase alternating current sampling mechanism comprises a voltage collector and a current collector, the output ends of the voltage collector and the current collector are connected with the input end of the three-phase metering mechanism, and the current collector is an integrated penetration type current sensor. The precision of the formed electric quantity sensor is higher than two precision levels of the system error of the metering device to be detected.
Preferably, the controller is used for controlling the on-off of the circuit, and an alternating current contactor or a relay or a contactless controller can be adopted.
The method for calibrating the electric energy metering accuracy on site comprises the following steps:
step S1, connecting the calibrator between a power distribution cabinet and a simulation load;
step S2, adjusting the load of the analog load according to the problem to be judged;
step S3, controlling the on-off of the circuit through a key on the calibrator or the mobile phone app;
step S4, the electric quantity sensor collects the running state of the three-phase power line and displays the data on the display screen through the data processing unit;
step S5, the data of the detected electric energy meter in the power distribution cabinet is read through 485 communication and then is transmitted to a remote wireless receiving device through a remote wireless transmitting device, and the data is displayed on a display screen through a data processing unit;
step S6, the data processing unit compares the data in step S4 and step S5 and stores the result on the display screen;
step S7, the mobile phone app receives and displays the data and the comparison result in step S4 and step S5;
step S8, the mobile phone app sends the data received in step S7 to the background for storage;
and step S9, after the data are stored, clearing the data stored in the data processing unit through a key or a mobile phone app so as to carry out the next calibration work.
Preferably, in step S2, the load box is used as the simulation load, and the load size of the load box can be selected according to the capacity of the transformer to which the detected electric energy meter is connected; the load needs to make the transformer working current break the capacitive characteristic in the loop, so that the transformer working current has inductive or resistive characteristics, and the load working current meets the range of 0-25% of the calibrated current of the detected electric energy meter.
Preferably, when the working current of the analog load is less than 5% of the calibration current of the detected electric energy meter, whether the wiring is correct or not can be judged according to the comparison result;
when the working current of the analog load is 5-20% of the calibrated current of the detected electric energy meter, whether the transformation ratio of the transformer is correct or not can be judged according to the comparison result;
when the working current of the analog load is more than 20% of the calibrated current of the detected electric energy meter, whether the line impedance is correct or not can be compared.
Preferably, step S6 specifically includes:
if the data error in the step S4 and the step S5 is 1% -10%, it indicates that the transformer transformation ratio or the line impedance is not correct;
if the data error in step S4 and step S5 is more than 10% or the data in step S5 is negative, it indicates a wiring error.
Preferably, the calibrator is provided with an exclusive two-dimensional code, and the mobile phone app can bind the calibrator by scanning the two-dimensional code so as to realize on-off control of the circuit and corresponding reception of data.
The load change of the load box can be controlled through the mobile phone to meet the change of the required load.
Compared with the prior art, the invention has the following advantages:
according to the invention, accurate data are measured by the electric quantity sensor and compared with the electric energy meter to be detected after the analog load is accessed into the circuit, so that the problem that the electric energy meter cannot work and cannot be measured due to the fact that the electric field load cannot reach the standard is solved, related data are recorded and stored by the aid of mobile phone apps, the working efficiency of workers is conveniently and rapidly improved, the judgment behavior of the workers has data, the method is particularly suitable for judging the accuracy of a metering system of a newly-built power distribution facility under the condition of no load or light load, and the method is suitable for high-level power supply, low-level power supply and low-level power supply. .
Drawings
FIG. 1 is a schematic connection diagram of the present invention;
FIG. 2 is a schematic view of a sensor of the present invention
FIG. 3 is a block diagram of the method of the present invention;
in the figure: 1. an electric quantity sensor; 2. a power distribution cabinet; 3. a controller; 4. a data processing center; 5. a socket; 6. a remote wireless receiving device; 7. a remote wireless transmitting device; 8. and simulating a load.
Detailed Description
The embodiments of the invention will be further described with reference to the accompanying drawings in which:
example 1:
as shown in the figure, the electric energy metering accuracy field calibrator comprises a shell, wherein an electric quantity sensor 1 is arranged in the shell, the electric quantity sensor 1 is connected with a three-phase line in a power distribution cabinet 2, the electric quantity sensor 1 is connected with a controller 3 through the three-phase line, the controller 3 adopts an alternating current contactor in the embodiment, the alternating current contactor is connected with a socket 5 through the three-phase line, and a data processing unit 4 is used for controlling the on-off of the alternating current contactor; the socket 5 is connected with an analog load 8 through a three-phase line;
the electric quantity sensor 1 adopts a high-precision wide-range penetration type electric meter which comprises a penetration type three-phase alternating-current sampling mechanism and a three-phase metering mechanism, the penetration type three-phase alternating-current sampling mechanism is connected with a three-phase power line in a power distribution cabinet, the output end of the penetration type three-phase alternating-current sampling mechanism is connected with the input end of the three-phase metering mechanism, and the output end of the three-phase metering mechanism is connected with the input end of a data processing unit 4.
The penetration type single-phase alternating current sampling mechanism comprises a voltage collector and a current collector, wherein the output ends of the voltage collector and the current collector are connected with the input end of a three-phase metering mechanism, and the current collector is an integrated penetration type current sensor.
Specifically, as shown in fig. 2, the three-phase load power line A, B, C directly passes through the integrated through current sensors CTa, CTb, and CTc arranged in the meter case as the primary side of the transformers, and the secondary side output terminals of the current transformers CTa, CTb, and CTc are respectively and directly connected with the corresponding current signal input terminals of the three-phase metering mechanism in the meter; the voltage sampling units arranged on the watch case respectively take out voltages Va, Vb, Vc and Vo of A, B, C phases and neutral line 0 and send the voltages to the voltage signal input ends of the three-phase metering mechanism in the watch.
The data processing unit 4 is connected with a remote wireless receiving device 6, the remote wireless receiving device 6 is in wireless communication with a remote wireless transmitting device 7, and the remote wireless transmitting device 7 reads the data of the detected electric energy meter in the power distribution cabinet 2 through 485 communication;
the shell is also provided with a display and a key, and the data processing unit 4 is respectively connected with the display and the key.
The data processing unit 4 is controlled by the mobile phone app through the wireless communication module 5; the wireless communication module 5 comprises a main control module, an APP module, a Bluetooth module and an expansion interface module; the mobile phone app is connected with a background server, and the background server is stored in the platform system.
The using method comprises the following steps:
step S1, the calibrator is connected between the power distribution cabinet 2 and the analog load 8;
step S2, adjusting the load of the analog load 8 according to the problem to be judged;
the analog load 8 can be provided by the site according to the transformer capacity, or a load box can be adopted, the load size of the analog load 8 can be selected according to the capacity of the transformer accessed by the detected electric energy meter; the load size needs to make the transformer working current break the capacitive load in the loop, so that the inductive or resistive characteristic appears, and the load working current meets the range of 0-25% of the calibrated current of the detected electric energy meter.
The load instrument can perform analog adjustment on the load of the load, so that the working current of the load meets the range of 0-25% of the calibration current of the detected electric energy meter. When the working current of the analog load 8 is less than 5% of the calibrated current of the detected electric energy meter, whether the wiring is correct or not can be judged according to the comparison result;
when the working current of the analog load 8 is 5-20% of the calibrated current of the detected electric energy meter, whether the transformation ratio of the transformer is correct or not can be judged according to the comparison result;
when the working current of the analog load 8 is more than 20% of the calibrated current of the detected electric energy meter, whether the line impedance is correct or not can be compared.
And step S3, a special two-dimensional code is arranged on the calibrator, and the mobile phone app can bind the calibrator by scanning the two-dimensional code so as to realize on-off control of the circuit and corresponding reception of data.
Step S4, the run-through sensing electric meter collects the running state of the three-phase power line, and displays the data on the display screen through the data processing center 4; the three through single-phase alternating current sampling mechanisms respectively sample each phase of a three-phase power line, so that electricity utilization states and phase information of three phases can be conveniently collected, micro signals are output to the three-phase metering mechanism, the three-phase metering mechanism carries out data processing, and the processed data are transmitted to the processor for judgment and comparison.
Step S5, the data of the detected electric energy meter in the power distribution cabinet 2 is read through 485 communication, then is transmitted to the remote wireless receiving device 6 through the remote wireless transmitting device 7, and is displayed on the display screen through the data processing center 4;
step S6, the data processing center 4 compares the data in step S4 and step S5 and displays and stores the result on the display screen;
if the data error in the step S4 and the step S5 is 1% -10%, it indicates that the transformer transformation ratio or the line impedance is not correct;
if the data error in step S4 and step S5 is more than 10% or the data in step S5 is negative, it indicates a wiring error.
Step S7, the mobile phone app receives and displays the data and the comparison result in step S2 and step S3;
step S8, the mobile phone app sends the data received in step S7 to the background for storage;
step S9, after the data is saved, the data stored in the data processing center 4 is cleared through a key or a mobile phone app, so as to perform the next calibration operation.
According to the invention, accurate data is measured by the electric quantity sensor and compared with the detected electric energy meter by utilizing the load access circuit, so that the problem that the electric energy meter cannot work and cannot be measured due to the fact that the electric field load cannot reach the standard is solved, related data is recorded and stored by utilizing the mobile phone app, the working efficiency of workers is conveniently and rapidly improved, and meanwhile, the judgment behavior of the workers can be based on the data.
Claims (10)
1. The electric energy metering accuracy field calibrator is characterized by comprising a shell, wherein an electric quantity sensor (1) is arranged in the shell, the electric quantity sensor (1) is connected with a three-phase line in a power distribution cabinet (2), the electric quantity sensor (1) is connected with a controller (3) through the three-phase line, the controller (3) is connected with a socket (5) through the three-phase line, and the socket (5) is connected with a simulation load (8) through the three-phase line;
a data processing unit (4) is further arranged in the shell, and the data processing unit (4) receives data of the electric quantity sensor (1) and is used for controlling the on-off of the controller (3);
the remote wireless transmitting device (7) reads the data of the electric energy meter to be detected in the power distribution cabinet (2) through 485 communication, the remote wireless transmitting device (7) is in wireless communication with the remote wireless receiving device (6), and the data processing unit (4) is connected with the remote wireless receiving device (6);
the shell is also provided with a display and a key, and the data processing unit (4) is respectively connected with the display and the key.
2. The electric energy metering accuracy field calibrator according to claim 1, wherein the data processing unit (4) is under app control with a mobile phone through the wireless communication module (5); the wireless communication module (5) comprises a main control module, an APP protocol module, a Bluetooth module and an expansion interface module; the mobile phone app is connected with a background server, and the background server is stored in the platform system.
3. The electric energy metering accuracy field calibrator according to claim 1, wherein the electric quantity sensor (1) comprises a through type three-phase alternating current sampling mechanism and a three-phase metering mechanism, the through type three-phase alternating current sampling mechanism is connected with a three-phase power line in a power distribution cabinet, an output end of the through type three-phase alternating current sampling mechanism is connected with an input end of the three-phase metering mechanism, and an output end of the three-phase metering mechanism is connected with an input end of the data processing unit (4); the three through single-phase alternating current sampling mechanisms respectively sample each phase of a three-phase power line, so that electricity utilization states and phase information of three phases can be conveniently collected, micro signals are output to the three-phase metering mechanism, the three-phase metering mechanism carries out data processing, and the processed data are transmitted to the processor for judgment and comparison.
4. The electric energy metering accuracy field calibrator according to claim 3, wherein the penetration type single-phase alternating current sampling mechanism comprises a voltage collector and a current collector, the output ends of the voltage collector and the current collector are connected with the input end of the three-phase metering mechanism, and the current collector is an integrated penetration type current sensor.
5. The electric energy metering accuracy field calibrator according to claim 1, wherein the controller (3) is used for controlling the on/off of a circuit, and an alternating current contactor or a relay or a contactless controller can be adopted.
6. The electric energy metering accuracy field calibration method according to any one of claims 1 to 5, characterized by comprising the steps of:
step S1, the calibrator is connected between the power distribution cabinet (2) and the analog load (8);
step S2, adjusting the load size of the analog load (8) according to the problem to be judged;
step S3, controlling the on-off of the circuit through a key on the calibrator or the mobile phone app;
step S4, collecting the running state of the three-phase power line by the electric quantity sensor (1), and displaying data on a display screen through the data processing unit (4);
step S5, the data of the detected electric energy meter in the power distribution cabinet (2) is read through 485 communication, transmitted to a remote wireless receiving device (6) through a remote wireless transmitting device (7), and displayed on a display screen through a data processing unit (4);
step S6, the data processing unit (4) compares the data in step S4 and step S5 and stores the result on the display screen;
step S7, the mobile phone app receives and displays the data and the comparison result in step S4 and step S5;
step S8, the mobile phone app sends the data received in step S7 to the background for storage;
and step S9, after the data are stored, clearing the data stored in the data processing unit (4) through a key or a mobile phone app so as to carry out the next calibration work.
7. The method for calibrating the electric energy metering accuracy in the field according to claim 5, wherein the analog load (8) in step S2 is a load box, and the load size of the load box is selected according to the capacity of a transformer connected to the electric energy meter to be tested; the load needs to make the transformer working current break the capacitive characteristic in the loop, so that the transformer working current has inductive or resistive characteristics, and the load working current meets the range of 0-25% of the calibrated current of the detected electric energy meter.
8. The electric energy metering accuracy field calibration method according to claim 6, characterized in that when the working current of the analog load (8) is less than 5% of the calibrated current of the electric energy meter to be tested, whether the wiring is correct or not can be judged according to the comparison result;
when the working current of the analog load (8) is 5-20% of the calibrated current of the detected electric energy meter, whether the transformation ratio of the transformer is correct or not can be judged according to the comparison result;
when the working current of the analog load (8) is more than 20% of the calibrated current of the detected electric energy meter, whether the line impedance is correct or not can be compared.
9. The method for calibrating the accuracy of electric energy metering in the field according to claim 5, wherein the step S6 is specifically as follows:
if the data error in the step S4 and the step S5 is 1% -10%, it indicates that the transformer transformation ratio or the line impedance is not correct;
if the data error in step S4 and step S5 is more than 10% or the data in step S5 is negative, it indicates a wiring error.
10. The electric energy metering accuracy field calibration method according to claim 5, wherein a dedicated two-dimensional code is arranged on the calibrator, and the mobile app can bind the calibrator by scanning the two-dimensional code, so as to realize on-off control of a circuit and corresponding reception of data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011621940.4A CN112946556A (en) | 2020-12-30 | 2020-12-30 | Electric energy metering accuracy on-site calibration instrument and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011621940.4A CN112946556A (en) | 2020-12-30 | 2020-12-30 | Electric energy metering accuracy on-site calibration instrument and method |
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| CN112946556A true CN112946556A (en) | 2021-06-11 |
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| CN202011621940.4A Pending CN112946556A (en) | 2020-12-30 | 2020-12-30 | Electric energy metering accuracy on-site calibration instrument and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113730A (en) * | 2021-11-22 | 2022-03-01 | 国网江苏省电力有限公司连云港供电分公司 | System and method for detecting wrong wiring of intelligent electric energy metering box |
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2020
- 2020-12-30 CN CN202011621940.4A patent/CN112946556A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114113730A (en) * | 2021-11-22 | 2022-03-01 | 国网江苏省电力有限公司连云港供电分公司 | System and method for detecting wrong wiring of intelligent electric energy metering box |
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