Today, I will introduce a national invention authorized patent-a method to improve the measurement accuracy and reliability of the energy meter. The patent was applied for by Jiangsu Linyang Energy Co., Ltd. and was granted an authorization announcement on June 19, 2018.
Description of contentThe invention relates to a method for improving measurement accuracy and measurement reliability of an electric energy meter, and belongs to the technical field of electric energy measurement.
Background of the inventionWith the development of smart grids, the stability and reliability requirements for electric energy metering are getting higher and higher. Especially in some occasions such as gate metering and substation metering, if the metering performance of the energy meter is inaccurate, it may lead to line loss exceeding the standard or negative loss, which will bring considerable trouble and trouble to both parties. In order to improve the measurement accuracy of the energy meter, the current common technical method is to install a high-precision voltage reference outside the measurement chip, but due to the aging of electronic devices, environmental changes and other factors, the function of the external high-precision voltage reference is malfunctioning or even invalid. In this case, the metering performance of the meter will be inaccurate.
Summary of the inventionThe purpose of the present invention is to propose a method to improve the measurement accuracy and measurement reliability of the electric energy meter in view of the above problems. The energy meter is designed with two sets of measurement voltage reference sources, an external high-precision voltage reference and a measurement chip built-in reference. The energy meter switches the voltage reference source to the measurement chip reference source, which improves the reliability of the energy meter measurement.
Processing flow chart
The technical solution of the present invention is: the present invention provides a method for improving the metering accuracy and metering reliability of the energy meter, and configuring the energy meter with two voltage reference sources: one of which is a voltage reference source provided inside the metering chip and the other metering The high-precision voltage reference source outside the chip can switch the voltage reference source according to the required energy meter.
Further, the method specifically includes the following steps: S1, in the production process of the energy meter, respectively perform error calibration on the two voltage reference sources, and save two sets of error calibration parameters in the energy meter according to the calibration result; S2, on the energy meter After electrical work, initialize the metering chip, switch the external high-precision voltage reference source and the internal voltage reference source as the metering chip reference source, and sample the externally input voltage and current signals; S3. Use the external high-precision voltage reference source and The measurement result of the internal voltage reference source is measured to determine whether the external high-precision voltage reference source is working normally. If the external high-precision voltage reference source is in normal operation, the energy meter defaults to the external high-precision voltage reference source as the measurement chip reference. Source; if the external high-precision voltage reference source is in abnormal working state, the energy meter is switched to the internal voltage reference source as the reference source of the measurement chip, which ensures the reliability of measurement.
S4. The energy meter periodically switches to the internal voltage reference source for measurement sampling, repeats the above steps, and switches the voltage reference source according to the accuracy of the voltage reference source. Further, the electric energy meter adopts the external high-precision voltage reference source as the reference source of the measurement chip by default. Further, the energy meter periodically switches to the internal voltage reference source for measurement sampling. If it is determined that the external high-precision voltage reference source is faulty, the internal voltage reference source is used as the reference source for the measurement chip by default. Further, in step S3, when the energy meter is switched to the internal voltage reference source as the measurement chip reference source, the energy meter sends an alarm signal to the control center; when the energy meter uses the external high-precision voltage reference source as the measurement chip reference source, the energy The meter turns off the alarm signal.
Beneficial effect of the present invention: The electric energy meter of the present invention judges the result of measurement and sampling using the external high-precision voltage reference source and the internal voltage reference source, and determines whether the external high-precision voltage reference source works normally. In the normal working state, the energy meter adopts an external high-precision voltage reference source as the reference source of the measurement chip, and the alarm state is turned off at the same time. At this time, the measurement accuracy of the energy meter is relatively high. Conversely, if the external high-precision voltage reference source is in an abnormal working state, the energy meter is switched to the internal voltage reference source as the measurement chip reference source. Although the measurement accuracy of the energy meter is reduced at this time, it has been sampled before delivery. , So the error accuracy is still within the range specified by the standard, ensuring the measurement reliability of the entire meter.
In this classification, we introduce smart IOT devices and server for many different fields, mainly four aspects which are Smart Agriculture, smart livestock, smart industry and smart cold chain. The devices we've developed can be used to monitor machine state like mowers, monitor temperature and humidity, monitor movements and time ETC. and the server we provide shows every necessary data for your convenient management. We also accept OEM for both devices and server, our engineers can support you at any time.
Internet of Things,4G IoT,Temperature Monitoring System,Equipment Working Hour,Monitoring System,Livestock Health Monitoring system
eSky wireless Inc , https://www.eskygpsiot.com