Abstract:Greatyou Coal Selection Co., Ltd. has installed an intelligent power operation and maintenance system in the power distribution room of its Jiajinwan Coal Selection Plant. This system integrates various sensors, collection, and communication equipment within the power distribution room, transmitting diverse data to the operation and maintenance service platform. Through the platform, the distribution room's high and low voltage switchboards and transformers are monitored online. The big data platform provides intelligent analysis and precise guidance for the safe operation, fault diagnosis, and condition warning of the power distribution room, achieving unattended or minimal attended operation, making the substation safer and more reliable.
Keywords:Coal Preparation Plant; Intelligent Monitoring; Power Distribution Room; Service Platform; Equipment Management
Introduction
The power distribution room, as the central location for equipment supplying electricity to the coal selection plant, is crucial for the plant's safety and stable production. Traditionally, the power distribution rooms in coal selection plants have been staffed with human operators, which demands high skill levels and continuous work from the personnel. Additionally, the high electricity consumption of production equipment results in poor energy-saving effects. Potential hazards in the power distribution room cannot be detected in time, and even when faults occur, they cannot be quickly identified. A significant amount of time is required for individual inspections and troubleshooting, severely impacting normal production. The intelligent transformation of the power distribution room is of great significance in further freeing up employee labor and improving the management level of the coal selection plant.
The Significance of Intelligent Monitoring in Power Distribution Rooms
The installation of infrared cameras in the smart power distribution room monitoring system can predict certain electrical accidents in advance. This can specifically manifest abnormal temperatures in electrical equipment. Dispatchers can detect these anomalies through the smart power distribution room monitoring system and promptly notify electricians for on-site inspections, preventing the occurrence of electrical equipment accidents from affecting production. The intelligent power distribution system enables precise and effective remote power on/off, intelligent patrols, and unmanned supervision, enhancing work efficiency, reducing production costs, alleviating labor intensity for employees, and freeing them from tedious posts. This, in turn, improves the quality of maintenance for critical equipment while increasing the reliability of human-machine safety. The deployment of intelligent patrol robots is of significant importance in helping coal preparation plants improve their intelligent safety management level, improve working conditions, and increase efficiency while reducing staffing.
2 Intelligent Monitoring System Architecture
The intelligent monitoring terminal devices are used to collect current and voltage values within low-voltage distribution cabinets, while the temperature controllers gather temperature data. The intelligent control and service platform deeply integrates technologies such as cloud computing, big data, the Internet of Things, mobile internet, and smart grid, relying on dedicated/wireless communication systems to collect data on the status of equipment, environmental conditions, and security within the enterprise's power distribution room. This enables intelligent control and various service functions for the power distribution room. The intelligent monitoring system architecture is shown in Figure 1.
The system platform collects system load information data to calculate and analyze total power and load values, active and reactive power, thereby determining the normalcy of operation. The gateway is primarily used for wireless connection to collect intelligent low-voltage monitoring devices, transmitting data such as three-phase electricity collection, energy metering, load statistics, power quality monitoring, temperature measurement, line faults, and status monitoring. It connects to the monitoring platform or mobile client via wireless communication or wired network.
The device employs an ARM Cortex-A8 architecture-based high-performance industrial-grade processor with a frequency up to 800MHz. It enables the wireless communication gateway to complete complex communication protocol conversions and manage communication tasks. It offers powerful, fast, reliable, and practical WebSCADA functionalities. Operators can monitor electrical, status, and environmental parameters of distribution rooms through browsers on the internet (including smartphone apps and WeChat official accounts). The system real-time monitors telemetry and supervisory data in various formats such as single-line diagrams, GIS maps, dashboards, tables, curves, and pie charts.
3 Achieve Functionality
The inspection robot (Figure 4) is equipped with functions such as sound collection, smoke and harmful gas detection, mobile video image acquisition, temperature sensing, and human-machine dialogue, providing precise guidance at any time on the maintenance and operation service platform. It can statistically and analyze key data such as power consumption, load, alarm status, energy efficiency, and power quality in coal preparation plants, automatically generating comprehensive reports and offering integrated high-quality services including energy management, energy-saving optimization, and expert diagnosis.
3.1 Data Monitoring and Statistical Analysis
Achieve 24/7 monitoring of the current and voltage in all low-voltage cabinets, allowing for direct and rapid detection of any issues without the need for manual checks on each unit. The system can be accessed on mobile devices or computers to view the status of low-voltage distribution cabinets at any time. Statistical data monitoring is done by time (daily, monthly, quarterly, annually) for multiple measurements of the same terminal, displaying, printing, and file output in the form of reports, curves, and bar graphs for the same measurement at different times or for the same type of measurement across different terminals. The system also provides statistics and analysis for important data such as equipment power, load, alarm status, energy efficiency, and power quality.
3.2 Smart Alarm
The system offers a range of alarm functions, including remote monitoring over-limit alerts, remote signal changes, equipment aggregation, alarm bell blinking, alarm sounds, voice announcements of alerts, and alert window displays. It also provides alarm notifications via SMS and WeChat official accounts as required.
3.3 Fine-tuned Management
Power efficiency monitoring terminals are installed on the main incoming and outgoing lines of the power distribution room, along with environmental monitoring terminals (temperature and humidity, water immersion, smoke detection). Data is transmitted to the platform system via 4G/5G wireless (or dedicated line).
3.4 Equipment Management
The equipment monitoring system queries real-time and historical telemetering and telesignaling data from intelligent instruments and probes, etc., at the level of equipment management. The system provides rich and practical analysis tools for telemetering data queries, comparisons, and statistics.
3.5 Electric Power Operation and Maintenance
The Operations Center conducts 24/7 remote monitoring to ensure reliable electricity usage. Through electricity analysis, we have implemented energy-saving upgrades for electrical equipment, replaced energy-efficient lighting, added compensation equipment, carried out frequency conversion改造, and updated outdated power distribution systems.
3.6 Daily Report
Monthly safety operation and electrical energy analysis reports are conducted on the equipment, ensuring timely understanding of its operational status and energy consumption.
4 Application Effects
The intelligent monitoring system for the power distribution room at the Wajinwan Coal Preparation Plant has been successfully launched and has yielded positive results. It enables the rapid detection of potential hazards, leading to more timely and effective problem resolution, reducing the frequency of accidents. The system can also pre-detect high-temperature and high-current equipment, allowing for timely maintenance before issues arise, thereby easing maintenance difficulties and saving labor resources. This allows electricians to focus more on ensuring safe production and protection.
5 Existing Issues and Prospects for Wide Application
Inspection robots often experience positioning errors after scanning. When preparing for operation, the robots are not subjected to repeated positioning verification, which can lead to positioning inaccuracies and cause the operation to become stuck. Multiple repeated positioning checks are required for the inspection robots, with a repositioning accuracy of ±2mm to ensure smooth operation without any hitches. Currently, on the domestic market, there are common issues with robots experiencing positioning errors. However, the newly developed equipment, after multiple repeated positioning checks on the robots, achieves an accuracy of ±2mm, ensuring the robots operate smoothly without any hitches during their operation.
Ankorri Distribution Room Environmental Monitoring System
6.1 Overview
The integrated power distribution room monitoring system includes an intelligent monitoring screen, communication management unit, UPS power supply, video monitoring subsystem (pan-tilt dome cameras, bullet cameras), environmental monitoring subsystem (temperature, humidity, water leakage, smoke detection), control subsystem (lights, air conditioning, dehumidifiers, fans, water pumps), access control monitoring subsystem (card readers, door release buttons, magnetic locks), and security monitoring subsystem (dual-sensing detectors).
6.2 Application Locations
Design, construction, and operation and maintenance services for power distribution automation systems for users in rail transit, industry, construction, schools, commercial complexes, and more, catering to voltage levels of 35kV and below.
6.3 System Architecture
6.4 System Features
6.4.1 Real-time Monitoring
The system can display the operational status of distribution room equipment, monitor real-time environmental parameters of the distribution room, and display real-time information regarding faults and alarms.
6.4.2 Data Query
In the human-machine interface, you can directly view the operational data of various equipment in the power distribution room.
6.4.3 Curve Query
Directly view the curves of various electrical parameters.
6.4.4 Operational Report
Check the operational data reports for the equipment within the electrical control room.
6.4.5 Real-time Alerts
The system features real-time alert capabilities, enabling it to issue warnings for events such as distribution room temperature, humidity, harmful gases, equipment malfunctions, or communication failures.
6.4.6 Historical Event Inquiry
The company's news: "The system can store and manage all generated event records, facilitating users in tracing historical events, conducting query statistics, and analyzing accidents."
6.4.7 User Permission Management
The User Permission Management feature has been set up, allowing for the definition of login names, passwords, and operational permissions for users of different levels.
6.4.8 Network Topology Diagram
Supports real-time monitoring and diagnostics of communication statuses across various devices, providing a comprehensive display of the entire system's network structure.
4.6.9 Remote Control Feature
Remote control operations can be performed on equipment within the entire distribution system range.
Intelligent construction is transforming the management and operational models of washing and selection. Currently, the promotion and application of intelligent monitoring terminal equipment can replace on-site manual operations, reduce labor intensity, and enhance productivity, making it an indispensable part of the future construction of intelligent power distribution rooms.
Reference
Zhang, Zonghua. Design of an Intelligent Video Monitoring System for Coal Preparation Plant. Journal of Mining Automation, 2013, 39(4): 76-79.
Liu Qinghua. Unmanned Substation Early Warning System and Method Based on Big Data Analysis: CN105958652A[P]. 2016.
Han Yibiao. Application of Intelligent Inspection System in Coal Selection Power Distribution Room
[4] AnkoRe Enterprise Microgrid Design and Application Manual, 2019.11 Edition
