Research of three-phase high-voltage energy metering device

The traditional metering device has some problems in system reliability, electricity-stealing prevention and accuracy. In order to solve the above problems, a new type of three-phase high-voltage energy meter based on RN8302 is designed in this paper. In order to collect voltage signal, we design voltage divider circuit. It uses low-power current sensor to collect current signals. The whole measurement system is hung on the high voltage side without potential difference by using high precision voltage divider to directly take electricity from distribution line and it has a very good anti stealing function. It uses the RN8302 which is professional metering chip as the core of the measurement unit and it has advantages in terms of operation, cost, and accuracy. Besides, STM32 as the main control CPU reduces the measurement error. Finally, we perform Printed Circuit Board(PCB) by using Altium Designer 10.0(AD10) and the experimental results show that the performance of the device has reached 0.2 S accuracy requirements. It meets the requirements of the current smart grid on the accuracy of the electric energy metering device, which is of great significance to the development of electric energy metering.