Short message voltage monitoring and statistical instrument

Product Overview

The SMS voltage monitoring and statistics instrument is based on traditional voltage monitoring and statistics instruments, and utilizes the short message technology in the current GSM communication field to achieve remote wireless monitoring and transmission of voltage in China. This instrument is an intelligent instrument that integrates monitoring, recording, and communication with microcontroller and GSM short message technology as its core. The product adopts large-scale integrated circuit technology, high-precision A/D conversion technology, microcontroller control technology, and anti-interference technology, and has the characteristics of high reliability, high measurement accuracy, complete functions, friendly human-machine interface, easy installation, and easy operation. It has the highest performance price ratio among similar products. For domestic *.

This instrument can monitor voltages of different voltage levels and has the ability to calculate voltage operation time, ultra-high * and ultra-low * on a daily and monthly basis. The system automatically calculates the corresponding voltage qualification rate and can also record the maximum and minimum voltage values and their corresponding occurrence times. It can query and display the daily voltage curve of each monitoring point by time, print daily and monthly reports, and other functions.

This monitoring and statistical instrument does not require manual copying of statistical data or the use of IC cards to read voltage data. Instead, it directly uses short messages to transmit voltage monitoring data back to the power supply department at regular intervals. This instrument is different from traditional statistical instruments that transmit statistical results through a MODEM modem via an incoming line. It can remotely transmit statistical data to your desired destination without the need for a line, and the cost is very low. This instrument enables management personnel to easily and directly read the data collected by voltage monitoring instruments located tens, hundreds, or even thousands of kilometers away through computers in the office, and can summarize and print it out.

System composition and network structure diagram

The system consists of five parts: SMS voltage monitoring and statistics instrument, GSM network, SMS control machine, computer, and voltage monitoring and statistics management software. The functions of each part are as follows:

◆

It is the front-end acquisition device of the system, specifically responsible for the collection, display, statistics, monitoring, storage, and wireless transmission of voltage data. It can monitor voltages of different types and voltage levels (100V, 220V, 380V). At the same time, it can also accept control commands from the management center and execute corresponding control operation instructions.

GSM network

The GSM network mainly provides network platform support for voltage monitoring and statistical instruments to transmit data to the management center. This section is maintained by mobile communication and does not require user attention.

◆ SMS control machine

The SMS control machine is the backend control device of the system, specifically responsible for communicating and contacting voltage monitoring instruments scattered in various places, receiving data sent by each voltage monitoring instrument, and transmitting control instructions to each voltage monitoring instrument.

◆ Computers and software

This section is the backend processing center of the system, consisting of computers and management software. Specifically responsible for the statistical analysis, query, storage, graphical display, printing and other functions of the voltage at each monitoring point.

Main functions of the monitoring device

Real time sampling and monitoring. The monitoring device uses effective value sampling for the monitored voltage, with a sampling period of once per second, and preprocesses and stores it. One minute is used as a statistical unit, and the average of the pre processed voltage values within one minute is taken as the representative of the real-time actual operating voltage of the monitored system.

The button displays the instantaneous voltage values of each channel, including the maximum (minimum) voltage values for the current day, current month, previous day, and previous month, as well as the time when the maximum (minimum) voltage value appears. It also includes the average value, pass rate, upper limit rate, lower limit rate, corresponding time, statistical time, and clock.

Press the button to read the daily voltage statistics of any day in the previous 31 days, as well as the average voltage at any positive time on any day.

◆ Able to set upper and lower voltage limits in different time periods, and assess voltage quality in different time periods.

Automatically record the last 18 power outage times of the monitored voltage.

◆ It has a controllable alarm function for instantaneous value exceeding the limit and a flashing LED alarm function for minute voltage value exceeding the limit (alarm for over limit and over limit respectively).

An automatic calendar system that matches the natural months.

Main technical indicators

The comprehensive measurement error of the monitor is 5% within the range of the rated voltage Un ± 20% being monitored.

Display voltage value on a 5-digit LED digital tube; Display time on a 6-digit LED digital display.

Clock error ≤ ± 1S/24h.

Equipped with Watchdog circuit, it will automatically reset within 3 seconds in case of interference.

Working environment temperature: -10 degrees Celsius -+40 degrees Celsius.

Relative temperature: 20% -90% at 40 degrees Celsius.

◆ Install high-energy lithium batteries and store power-off data for more than ten years.