Designation Of The Coal Mine Power Supply Monitoring And Control System Based On Industrial Ethernet And Field Bus

The coal mine power supply equipments have became the importantsupport of coal mine production and control, with automatic equipment iswidely used in modern coal mining enterprises in recent years. The protectiondevice will automatically opening and remove the fault line when faults occur,like short circuit, leakage, overvoltage. This approach bring a potential threat tothe stable operation of coal mine supply system, so, most of mine substationhave special persons check the switches and protective devices to ensure thepower supply system operate stably. But with the mining depth more and moredeeply and distributed points increased, a simple manual inspection is not onlylow efficiency, but also can not quickly determine the accident site, timelytroubleshooting, this problem causes long blackouts cycle, affects the efficiency of coal mining district, even endanger safety.The coal mine power supply monitoring and control system is a coal mineautomation system, it can achieve the goal of remote centralized monitoring ofequipment status, remote tuning parameters of protective devices, remoteoperating protective devices when dispatchers allow, so, the staff can real-timegrasp the status of power supply system and quickly learn the fault locationswhen protective devices operate, timely formulate the corresponding measures.This monitoring and control system can shorten the outage time to ensureproduction safety. For an actual power monitoring and control system, field datacollecting and communicated network constructing is important. But in thepresent design method of system, data acquisition relay too much on signaloutput interface of supply equipment, do not have the ability of collect coal minesensor signal, its communication mode is single and master-salve style is themain way resulting in instability. The present method has less design ofmicrocontroller, limiting further improvement of network. Therefore, designinga microcontroller-based, compatible with mine sensor signals, and has a diverseand reliable communications capabilities coal mine power monitoring andcontrol system is extremely important and have great application value.This thesis proposes a coal mine power monitoring and control systembased on the industrial Ethernet and field bus, achieve the goal of remotemonitoring of power supply equipment, remotely tuning parameters ofprotective devices, remote operating protective devices when dispatchers allow, by collecting and sharing the supply system operated information and designingremote terminal to monitor and control supply equipment. The staff canunderstand the real-time information of equipment, grasp the initiative to dealwith the accident, achieve the goal of remote integrated management of powersupply equipment. These main topics are studied in the following areas:1、The coal mine monitoring and control system is consist of coal minemonitoring unit, ground control center and communication network. TheSTM32-based monitoring unit has signal acquisition circuit, display interfaceand RS485, CAN, Ethernet communication interface, achieves the goal of datadisplay, status monitoring, parameter tuning and other functions, uploadingrunning information of supply equipment to ground control center, completingthe summary of monitoring points, laying the foundation for remote monitoringof power supply equipment.2、The ground control center which is designed by KingView can displaypower parameters, protective limits and protective equipment status, adjustparameters of protective devices, operating protective devices, record data intodatabase, pop-up prompt window when protective devices act, indicate theoperation sites. The ground center as the total terminal of monitoring and controlsystem, completes the function of remote monitoring, so that the staff can graspthe situation of power supply equipment, enhance the abilities oftroubleshooting.3、The communication network is designed to connect the power supply equipment, coal mine monitoring unit and ground control center based onindustrial Ethernet and field bus. The electrically isolated RS485interface isdesigned to connect power supply equipment with the function ofcommunication recovered and data validation, achieving the goal to collect dataand transport order. The underground Ethernet is built to connect coal minemonitoring units based on TCP/IP architecture with the function of networkself-diagnosis, achieving the goal to transport information stably amongmonitoring units. According to the feature of KingView network interface, theinterconnect pathway is built to connect ground control center and undergroundEthernet based on Modbus/TCP protocol model. The pathway achieves the goalto monitor coal mine power supply situation by transporting informationbetween ground control center and underground Ethernet. The CANcommunication interface is created to connect other units or power supplyequipment with the function of anti-jam, achieving the goal to improve the levelof network compatibility.According to the researches, this thesis designs the hardware circuit andprogram of coal mine power supply monitoring and control to realize thefunction of following features:(1) the parameters of supply equipment and thestatus of protective devices can be remote monitored;(2) the protective valuecan be adjusted in local and remote place; the protective devices can be operatedwhen dispatchers allow;(3) the staff can inquiry other monitoring pointinformation and adjust value;(4) the ground control center can save data into database and suggest accident location and fault type when accident occur.The coal mine power supply monitoring and control system based onEthernet and field bus achieve the goal to monitor and operate coal mine powersupply equipment remotely. The system can be used in the power environmentwhich is complex and dispersed, so that the staff can understand the powersupply information and grasp the initiative of handle accident. The system alsoimproves the level of the power supply network.