System Overview
The coal mine power monitoring system provides a strong guarantee for the stable operation of coal mine power usage and is now gradually becoming an indispensable part of the power supply and distribution system. The power monitoring system has become one of the systems for mine safety production. It is widely used in coal mines, and its system enhances the efficiency of electricity usage and saves costs through its stable, timely, safe, and convenient advantages. The power monitoring system can accurately determine the causes and locations of faults, providing robust support for the safety and intelligent development of mines.
To better achieve remote monitoring and unattended requirements of coal mine substations, our company has developed a mine power monitoring system based on mine safety production using the SCADA system.
The system adopts a layered and distributed system structure, vertically divided into three layers: monitoring layer, communication network layer, and field control layer. It utilizes high-performance industrial control computers and upper computer software monitoring systems, incorporating mature field bus technology and network communication technology to ensure the entire system operates safely, stably, and reliably, and is convenient for maintenance and use. The system includes a power data acquisition and monitoring system, power distribution automation system, load control system, energy metering system, and power dispatch data network.
System Components
1.Industrial Computer and Upper Computer Software: This component allows for remote control, remote data display, remote operation status monitoring, and video surveillance. It supports Web browsing and can be integrated with the mine automation system platform.
2.Communication Management Machine: Serving as a data collection terminal within the system, this machine can aggregate data from different meters and microcomputer protection devices according to various data collection protocols, and upload this data to the system platform.
3.Microcomputer Protection and Control Device: This device integrates protection, measurement, and control functions to manage the protection and monitoring of substations.
4.Temperature and Humidity Control Device: Sensors are used to detect the temperature and humidity inside the cabinet. The device adjusts these parameters through external fans and heaters, effectively preventing equipment failures due to low or high temperatures, as well as creepage and flashover accidents caused by dampness or condensation.
5.Current Transformer Overvoltage Protector: This protects against accidents caused by abnormally high voltage on the secondary side of the current transformer.
System Functions
Power System Operation Monitoring
The system has the function of displaying the wiring of medium and low voltage distribution networks through a CAD primary single-line diagram. Large systems have multi-screen switching and screen navigation capabilities; distributed distribution systems have a system main screen with a spatial geographic plan. The main screen can intuitively display the operating status of each circuit and has functions for indicating whether circuits are energized, de-energized, or faulted through coloring. The main electrical parameters are directly displayed on the human-machine interaction interface and are refreshed in real-time.
Remote Monitoring Function
The remote monitoring station is set up in the dispatch center, equipped with high-performance industrial computers and monitors, upper computer software, configuration software, gigabit switches, and other devices. The industrial computer runs upper computer configuration software, which can display the system's operational parameters in real time. Moreover, the system data adopts a B/S structure, allowing for data browsing through the IE browser. It can also display operational data in various forms such as tables and graphs for intuitive visualization.
Data Collection and Analysis Function
The intelligent power monitoring system can collect various electrical parameters and switch status from field equipment in real-time and on a scheduled basis (including three-phase voltage, current, power, power factor, frequency, electric energy, temperature, switch position, equipment operating status, etc.). The collected data may be directly displayed or transformed into new, intuitive data information through statistical calculations (such as total system power, maximum load, power factor limits, etc.) and stored in a database for important metrics.
Alarm and Event Management Function
The system maintains detailed records of all user operations, switch changes, parameter exceedances, and other events based on actual user needs. These records include the time and location of the event, whether the current duty personnel have confirmed the event, and other relevant information. For switch changes and parameter exceedances, the system also features an audible alarm function. Additionally, it automatically sends control commands to operating equipment or alerts duty personnel to quickly troubleshoot and resolve faults.
Historical Data Query Function
Both the supervisory control computer and the PLC electrical control main host in the system support the query functions for historical fault records, equipment operation records, equipment operation logs, and equipment runtime data reports. The supervisory control system also supports one-click export and printing functionalities. The system can store data for at least two years or more.
Electricity Management Function
The system offers electricity monitoring, electricity quality management, and electricity safety monitoring, characterized by its high professionalism, high degree of automation, and ease of use. By reasonably allocating the load, it achieves optimized operation, effectively saves energy, and allows for querying electricity usage records during peak and off-peak times.
Report Management Function
The system features standard energy report formats and can design report formats according to user requirements, with capabilities for automatic data compilation. It can automatically generate various types of reports such as real-time operation reports, historical reports, event fault and alarm record reports, and operation record reports. Users can query and print all data values recorded by the system. It automatically generates daily, monthly, quarterly, and annual energy reports, and creates energy tariff reports based on defined time periods and tariff settings. Parameters such as the starting point and interval for query and printing can be customized; the system design also allows for tailored report output functions to meet diverse user requirements.
User Management Function
The intelligent power monitoring system software assigns different levels of access permissions to users based on their roles, ensuring the security and reliability of the system during operation. For instance, operations such as closing or opening critical circuit breakers require not only an operator-level user to enter an operation password but also an engineer-level user to input a confirmation password before the action can be completed.
Video Surveillance System Function
If equipped with a video monitoring system, it can collect live image information through video cameras using optical fiber communication media, and upload it to the surface control center. This setup allows for convenient and intuitive remote monitoring of on-site conditions at the work face and the operation of belt conveyors, thereby enhancing the system's reliability and safety. The cameras are connected via optical fiber cascading to the mine's ring network switch and directly uploaded to the surface monitoring center.
Main Functions
Information Collection: The image signals captured by the cameras are transmitted in real time to display screens.
Video Sub-control Management: Enables simultaneous monitoring of multiple different image signals, supporting remote monitoring, remote access, and alarm linkage functions.
Surveillance Function: Any video signal can be monitored through the display screen.
Playback Function: Enables real-time querying and playback of images saved by the digital video recorder.
Recording Function: The digital video recorder performs real-time and scheduled video recording storage.
Switching Function: Automatically scans and cycles through set images at defined time intervals.
Preview Function: Users can directly access IP cameras or video servers through the IE browser.
Video File Query Function: Video files from all cameras can be searched based on time, alarm records, and other criteria.
Main System Equipment
●KBA127 Mine-Use Explosion-Proof Camera (with Fiber Optic and Network Interface): This is a new generation of explosion-proof surveillance equipment that uses advanced H.265 intelligent encoding technology and a 1/3 inch high-definition million pixel camera. The quality and performance of this product lead among similar domestic and international products. The camera's integrated design offers high-definition clarity, low-light performance, spark-free operation, water and dust resistance, compact size, light weight, flexible configuration, low transmission loss, long transmission distance, and easy installation. Additionally, it features strong light suppression and color-to-black-and-white conversion capabilities.
●KBA12H Mine-Use Intrinsically Safe Infrared Camera: Primarily used for underground video monitoring in coal mines, it features an Ethernet optical signal output interface. External light enters through a glass window to the lens, focusing on the camera's CCD chip, which converts it into an Ethernet optical signal output. The camera can clearly see objects in low light conditions as low as 0.05 Lux, and converts the collected real-time images into Ethernet optical signal outputs. The camera operates at a rated voltage of DC12 V and has two SC-type interfaces for TCP/IP Ethernet optical signal transmission.
