Study Of The Computer Room Distribution Cabinet Microenvironment Monitoring System

At present, in the safety and reliability construction of computer room, the safety objects monitored by State Grid in the computer room are mostly large environmental data and distribution cabinet microenvironment data is rarely monitored. Once the microenvironment hardware facilities are faulty, resulting in power system outage, it is difficult to lock the source of failure in first time and it needs a certain time for manual investigation. To solve this problem, a set of monitoring system for the microenvironment of computer room power distribution cabinet is studied.The hardware control center of the monitoring system terminal uses a microcontroller called STM32, which controls RN8302B dedicated energy metering chip to collect three-phase voltage, current, active power and other RMS parameters of distribution cabinet inlet side and outlet side and also controls DHT22, LM94022,MQ-2, SW-18015, YL-56, YL-38, HC-SR501, OV7725, MFRC522 and other sensors to monitor a variety of data indicators, including cabinet environment temperature and humidity, switch temperature, smoke concentration, cabinet vibration, noise frequency, fire source or not, animal invasion, fault image, access card number and so on. Then the monitoring data is transmitted via Ethernet to the remote monitoring room. When the monitoring indicators are abnormal, the monitoring system locks the source of failure automatically and issues the message of exception prompt and carries out the corresponding control operation.In order to make the CPU orderly and effectively occupied in turns by multiple tasks, the uC/OS-III real-time operating system is designed to be ported to the STM32 microcontroller. The monitoring terminal monitors the data on site with the man-made friendly Dewan display screen. The host computer design uses the plan of"dual architecture+mobile APP". The LwIP protocol stack is ported to the uC/OS-III system, so that the monitoring terminal becomes a separate WEB server under the B/S architecture and staff can monitor remotely and flexibly with the browser or mobile APP.The DELPHI host computer monitoring interface under the C/S architecture is designed on the monitor room computer.The prototype has been made in the lab and the tests proof that the RMS accuracy of the voltage, current and active power can all reach 0.5s after the prototype power calibration. The measuring range and accuracy of various types of microenvironment sensors meet requirements of GB7251.1-2013, among the sensors,the switch device temperature measurement sensitivity is adjustable. When the abnormal data of power quality is input, the monitoring terminal display interface automatically tracks the fault data and the terminal automatically controls the relay switch to cut off the fault or switch to the standby loop. When the smoke concentration in the cabinet is simulated over the threshold, the exhaust fan can be automatically speeded by PID to eliminate smoke. When the fault occurs, the staff will receive message prompts sent by terminal and then check the graphics and text records, so the fault type will be verified. The actual test results of the prototype are basically consistent with the intended monitoring indicators and pre-realized functions.