The Design Of Electricity Meter Monitor System Based On Modbus Protocol

In recent years, with the constant transformation and development of power grid, power of enterprises and households are gradually optimized. At present, the industrial and mining enterprises need a smart meter, which can measure electrical parameters real time, to ensure that equipment can reliably operate in the process of production. Power meter monitoring system based on MODBUS protocol can solve the above problems perfectly. The system consists of four modules-multifunction meter, automatic calibration software, PC software and host.Multifunction meter based on ATmega32microcontroller and ATT7022sampling chip can real-time display voltage, current, power, energy, frequency and power factor. The instrument has communication function. It can be used alone or in conjunction with the host.Each instrument requires calibration before leaving the factory. The traditional calibration method uses manual calibration, which is low precision and slow speed. Automatic calibration software via a serial port to read and write data, with backstage calculation, can make the calibration speed increased by more than ten times. At the same time, the software using piecewise calibration technique. The instrument measurement precision can reach0.2on the Richter scale.PC management software based on VC is the comprehensive management of multiple lower nodes. By data exchange between the RS-485bus and the lower computer, the software can do tasks like displaying electrical parameters, setting remotely, clearing power etc.Supervisory host is based on PIC24microcontroller and it can real-time monitor multiple lower instrument. When any instrument voltage current or power overruns, monitoring host will generate alarm signals, and the alarm time, alarm source, content of alarm information will be permanently recorded. When its power failure or communication failure, the host will produce a corresponding fault signal, troubleshooting, fault signal disappears automatically. Alarm signal must manually remove or reset. In addition to the basic fault alarm function, monitoring host also integrates the function of electricity multi-rate and remote meter reading, namely, the accumulation of power-sharing, setting rates manually, electricity automatic settlement, printing details. In addition, the monitor host is also loaded with the voice module and the main electricity switch module.The system from the original data collection to data processing and data transmission, to the data output and statistical records all intelligent, systematic, solves the problem of collection difficulty, large error and low efficiency. The power meter supervisory system not only can be used in the whole factory or workshop, whose measurement and monitoring can also be used in a single device.