Application of Acrel-2000 Power Monitoring System in Qingyuan Mengniu Division Arkori Qingqing 1 Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd., Jiangyin, Jiangsu 214405; Abstract: The power monitoring system of Qingyuan Mengniu Business Department was introduced. Intelligent power meters were used to collect various electrical parameters at the distribution site. The system adopts the on-site local networking method. After the networking, it is remotely transmitted to the monitoring background through fieldbus communication. The Acrel-2000 power monitoring system realizes the real-time monitoring of power distribution circuit substations in substations. Keywords: substation; smart power meter; Acrel-2000; power monitoring system; 0 Overview  Mengniu Dairy (Qingyuan) Co., Ltd. was founded on October 18th, 2009, located in Qingyuan City, Guangdong Province, where China's economy is developing rapidly. It is currently the second plant of Mengniu's self-raised funds in the south of the Yangtze River. The total investment is 260 million yuan and the second phase investment is 200 million yuan. Covers an area of ​​178.8 acres, a period of low-temperature daily processing of 200 tons of fresh milk, pre-treatment daily processing capacity of 400 tons. Qingyuan Mengniu Business Project includes the first phase of the power monitoring system and the second phase of the power monitoring system. The first phase includes the power center power distribution room and the production plant power distribution room; the second phase includes the second phase power distribution room. First-phase power monitoring: According to the requirements of power distribution system management, all the low-voltage distribution lines of Phase 1 and Phase 2 of Qingyuan Mengniu Business Group need to be monitored for power, and an independent monitoring system platform is required for the first-phase and second-phase duty rooms, and the monitoring platform is also You can view real-time data from another platform to ensure that electricity is safe, reliable, and efficient. Acrel-2000 low-voltage intelligent power distribution system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and conducts distributed data acquisition and centralized monitoring and management of the power distribution system. The secondary equipment of the distribution system is networked. Through the computer and the communication network, the field devices of the decentralized power distribution station are connected into an organic whole, and remote monitoring and centralized management of the power grid operation are realized. 1 System Structure Description The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer; as shown in (1)(2): Figure (1) Phase 1 network topology Figure (2) Phase 2 network topology Interval equipment layer mainly includes: multi-function network power meter, switch quantity, analog acquisition module and intelligent circuit breaker. These devices are corresponding to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the scene MODBUS bus networking communications, data acquisition on the spot. The main network communication layer is: communication server/communications expansion card. Its main function is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange between the field layer and the station control layer. Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers, alarm buzzer and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the equipment in the field and display it to the user in the form of human-computer interaction. The first phase of the power monitoring system and the second phase of the power monitoring system use optical fiber connections to achieve data and screen sharing. The above network instruments use RS485 interface and MODBUS- RTU communication protocol, RS485 adopts shielded wire to transmit , generally two wires are used to connect, and the connection is simple and convenient; the communication interface is half duplex communication , that is , both parties can receive and send data, but can only send or receive data at the same time . The maximum data transfer rate is 10Mbps . RS48 5 interface is a balanced differential driver and receiver combination, enhanced noise immunity, allows up to 32 devices on the bus, the maximum transmission distance of 1.2km. 2 main functions of the power monitoring system 2.1 Data Acquisition and Processing Data acquisition is the basis of power distribution monitoring. Data collection is mainly accomplished by the underlying multi-function network instrumentation to achieve local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, power Epi, and remote device operating status. The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query. 2.2 Human-computer interaction The system provides simple, easy to use, and good user interface. Using the Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low voltage distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters, the screen timing switching tour; dynamic refresh of the screen in real time; analog display; switch display; continuous Record display and so on. 2.3 Diachronic events The duration event viewing interface provides users with easy and friendly human-computer interaction by viewing the fault records, signal records, operation records, and over-limit recordings that have occurred. You can view the platform through historical events. You can easily locate the fault according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the operation of the entire system. 2.4 Database Establishment and Query It mainly completes remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print. 2.5 User Rights Management For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate the user's modification of accounts and permissions. 2.6 Running load curve The load trend curve function is mainly responsible for regularly collecting incoming lines and important loop current and power load parameters, and automatically generating running load trend curves to facilitate users to understand the operating load status of the equipment in a timely manner. Click the corresponding button or menu item of the screen to complete the switching of the corresponding function; you can view the real-time trend curve or historical trend line; you can perform operations such as pan, zoom, and range conversion on the selected curve to help the user enter the line trend. Potential analysis and fault recall provide intuitive and convenient software support for analyzing the operating status of the entire system. 2.7 Remote Report Query The main function of the report management program is to design the report style according to the needs of the user, and the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files. The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing. 3 Case Studies The monitoring system mainly implements the monitoring of the distribution system of the first and second phases of the Qingyuan Mengniu Business Division. The monitoring scope is as follows: The first-stage power distribution room consists of two independent power distribution rooms. The power distribution room of the production workshop is about 200 meters away from the power center power distribution room. The power center distribution room contains the main room and the secondary room, and the secondary room is about 30 meters away from the main room. The Acrel-2000 power monitoring system is located in the secondary room of the power center distribution room. There are 2 transformers (1# transformer and 2# transformer) in power center power distribution room, and there are 57 smart meters (3 categories); 4 shielded twisted pair bus connections are used in the site. There are 2 transformers (3# transformers and 4# transformers) in the power distribution room of the production workshop, a total of 39 smart meters, and two shielded twisted pair bus connections are used in the site. Second-phase power monitoring: There are 4 transformers (5# transformers, 6# transformers, 7# transformers, and 8# transformers) in the second-stage power distribution room, with a total of 187 smart meters (3 categories). The site uses 9 shielded twisted pair bus connections. All meters installed in the power distribution room are multi-function network meters. The meters mainly measure all conventional power parameters such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, Reactive power. The secondary diagram of the power distribution room is shown in Fig. (3)(4). The main function of the power meter telemetry is to monitor the electrical parameters of the operating equipment, including: three-phase voltage, current, power, power factor, power, frequency and other electrical parameters and distribution The three-phase current out of the circuit; remote signaling function to display the operating status of the field equipment, including: the switch of the switch, closing operation status and communication failure alarm; circuit breakers will send an alarm signal when the displacement, to remind users to deal with the problem in time. Figure (3) Secondary map of low-voltage power distribution in the first phase Figure (4) Second-phase secondary diagram of low-voltage power distribution The remote signaling and telemetry alarm functions mainly complete the monitoring of the switching operation status and load incoming line of the low-voltage outlet loops, and indicate the specific alarm position and audible alarm to the switch displacement and load over-limit pop-up alarm interface to remind the on-duty personnel to deal with it in time. The load limit can be set freely under the corresponding authority. With historical query function, see Figure (5). Figure (5) Real-time alarm information The parameter reading function mainly inquires into the electrical parameters of the low-voltage outlet circuit. Supports electrical parameter query at any time, with functions such as data export and report printing. This report queries the electrical parameters of the low-voltage loops for the eight transformer substations of the two substations, mainly including: three-phase voltage, three-phase current, active power, reactive power, frequency, and active energy. The name of each loop of the report is associated with the database, which is convenient for the user to modify the loop name. Figure (6) shows the real-time data of the 5# transformer loop. Figure (6) Parameter meter reading The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The name of each loop of this report is associated with the database, which allows users to modify the loop name. The user can print the report directly, and can save it to another location in EXCEL format. Figure (7) shows the statistics of the power report of the transformer loop #5. Figure (7) Energy Report The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a hierarchical distributed structure and simultaneously monitors the communication status of the equipment at the bay level. Red indicates normal communication and green indicates communication failure. See Figure (1) and Figure (2). The load trend curve interface allows you to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item to complete the switching of corresponding functions; help the user to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the overall system health, see (8). Graph (8) Trend Graph For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. User management can be used to perform user login, user logout, password change, and add/delete operations to facilitate the user's modification of account numbers and permissions. See (9). Figure (9) User login 4 Conclusion With the development of society and the wide application of electricity, the power monitoring system has become an inevitable choice for large-scale multi-substation users, such as key construction projects, landmark buildings, and large-scale public facilities throughout the country. The Acrel-2000 power monitoring system introduced in this paper is introduced. The application of the Qingyuan Business Unit can realize the real-time monitoring of substation low-voltage power distribution circuits. It can not only show the power status of the circuit, but also has the functions of network communication and WEB release, and can be used for power monitoring with serial servers and computers. system. The system analyzes and processes the collected data, displays the operating status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and voice prompts for the closing and closing of the load, and generates various energy reports and analysis curves. Graphics, etc., to facilitate remote meter reading and analysis, research. The system is safe, reliable, and stable. It provides real and reliable basis for substation users to solve electricity problems and has achieved good social benefits. [2] references: [1]. Ren Chengcheng, Zhou Zhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4 [2].Zhou Zhouzhong, et al. Product Selection and Solution for Smart Grid User-end Power Monitoring and Power Management System[M]. Beijing. Machinery Industry Press. 2011.10 About the Author: Qingqing Qing (1985-), female, Han nationality, undergraduate, engineer, major research direction for smart building power distribution monitoring system QQ T: 0510-86189390 M: 18860995120 F E-MAIL: URL: http: // http: // ecc jy acrel.cn/.
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Application of Acrel-2000 Power Monitoring System in Qingyuan Mengniu Division