Arkori Qingqing
Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd., Jiangyin, Jiangsu 214405, China
Abstract : This paper introduces the power monitoring system of Bai Gangyu project of Sanmenxia Mingzhu Group Electro-metallurgy Co., Ltd. and adopts intelligent power meter to collect various electrical parameters and switch signals at the distribution site. The system adopts on-site local networking method. After networking, it communicates via the field bus and transmits it to the background. The Acrel-2000 power monitoring system realizes real-time monitoring and power management of power distribution circuit substations.
Keywords: substation; smart power meter; Acrel-2000; power monitoring system
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0 Overview
This project is the electric power monitoring system of the Bai Gangyu project of the Sanmenxia Mingzhu Group Electric & Metallurgical Company. According to the requirements of power distribution system management, it is necessary to perform power monitoring on the power distribution room of Bai Gangyu project of Sanmenxia Mingzhu Group Electrical and Metallurgical Co., Ltd. to ensure the safety, reliability and high efficiency of electricity use.
Acrel-2000 intelligent power distribution system makes full use of the most innovative development of modern electronic technology, computer technology, network technology and field bus technology, and conducts distributed data collection and centralized monitoring and management of the power distribution system. The secondary equipment of the power distribution system is networked, and the field devices of the distributed power distribution stations are connected as an organic whole through the computer and the communication network to realize remote monitoring and centralized management of the power grid operation.
1 System Structure Description
The monitoring system mainly realizes the power consumption monitoring of the 10KV power distribution system of the Baigangyu project of Sanmenxia Mingzhu Group Electro-metallurgical Co., Ltd.; the monitoring scope is high-voltage comprehensive protection of 5 substations, and 2 low-voltage electric meters. The system has a total of 7 Ankerui meters, divided into 2 buses, directly pulled to the computer in the duty room of the substation to realize the data connection between the instrument on the bus and the monitoring host.
The monitoring system adopts a layered distributed structure, that is, a station control layer, a communication layer and a space layer;
As shown in Figure 1:
Figure (1) Network topology diagram
The interval device layer is mainly: multi-function network power meter. These devices are respectively installed in the electrical cabinet corresponding to the corresponding primary equipment. These devices all adopt RS485 communication interface, and realize on-site data collection through the on-site MODBUS bus networking communication.
The network communication layer is mainly: serial port conversion isolator. Its main function is to collect the scattered devices in the field and transmit them to the station control layer to complete the data interaction between the field layer and the station control layer.
Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the field equipment and display it to the user in the form of human-computer interaction.
The above network instruments all use RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission. Generally, two wires are used for connection. The connection is simple and convenient. The communication interface is half-duplex communication. Both parties can receive and send data. Only data can be sent or received at the same time, and the maximum data transmission rate of the data is 10 Mbps.
The RS485 interface is a combination of balanced drivers and differential receivers. It has enhanced noise immunity and allows up to 30 devices to be connected on the bus. The maximum transmission distance is 500 meters.
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, realizing 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 high and 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 real-time; analog display; switch display; Continuous record display and so on.
2.3 Historical events
The historical event viewing interface provides convenient and friendly human-computer interaction for the user to view fault records, signal records, operation records, and over-limit records that have occurred. You can view the platform through historical events. You can easily locate your own according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.
2.4 Database Establishment and Query
It mainly completes the 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 user modification of accounts and permissions.
2.6 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 on the report file to save, print. At the same time, the program also provides users with the function of generating report file management.
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 power monitoring system of the power supply project of the Baigangyu project of Sanmenxia Mingzhu Group Electric Metallurgical Co., Ltd. includes a substation. The project conducts power management for the substation power distribution system; remote real-time monitoring of the high voltage distribution circuit of the substation.
The ACR320E multi-function instrument is used in the power transmission and return line. It is a network power meter designed for power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure conventional power parameters, such as three-phase voltage. Current, active power, reactive power, power factor, frequency, active energy, reactive power and other electrical parameters. This series of network power meters are mainly used in substation automation, distribution network automation, residential power monitoring, industrial automation, energy management systems and intelligent buildings.
The primary diagram of high-voltage power distribution is shown in Figure (2). The function has electric power telemetry. It mainly monitors the electrical parameters of the running equipment, including: line three-phase voltage, current, power, power factor, electric energy, frequency and other electrical parameters and the three circuits. Phase current; the remote signal function realizes the display of the running status of the field device, mainly including: the switch's branching and closing operation status and communication fault alarm; when the circuit breaker is displaced, an alarm signal will be sent to remind the user to handle the fault in time.
Figure (2) High-voltage power distribution
The remote signal and telemetry alarm function mainly completes the switch operation status and load line monitoring of the low-voltage outlet circuits, and pops up the alarm interface for the switch displacement and load limit, indicating the specific alarm position and sound alarm, reminding the on-duty personnel to deal with it in time. With real-time query function, see Figure (3).
Figure (3) Real-time remote alarm information
The parameter meter reading function mainly queries the electric parameters of the high-voltage outlet circuits. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of each high voltage circuit of a substation, including: three-phase voltage, current, power factor, active power and active power. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. See Figure (4).
Figure (4) Parameter reading
The power consumption report function can select the time period for query, support the electricity cumulative query for any time period, and have the functions of data export and report printing. Provide accurate and reliable energy reports for duty personnel. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown in the figure below, the accurate power consumption of each power distribution circuit in a certain period of time is displayed. The user can directly print the report and save it to other locations in EXCEL format. See Figure (5).
Figure (5) Energy Report
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Red indicates normal communication and green indicates communication failure. See Figure (6).
Figure (6) System communication structure diagram
4 Conclusion
With the development of society and the wide application of electric power, the power monitoring system has become an inevitable choice for key sub-projects, landmark buildings/large public facilities and other substation users throughout the country. The Acrel-2000 power monitoring system introduced in this paper is in Sanmenxia Pearl. The application of the 10KV power distribution room of the Baigangyu project of the Group's Electrical and Metallurgical Company can realize the real-time monitoring and power management of the substation high and low voltage distribution circuits. It can not only show the power status of the circuit, but also has network communication functions. Serial port isolator, computer and other components constitute a power management system. The system analyzes and processes the collected data, displays the operating status of each distribution circuit in the substation in real time, and generates various energy reports, analysis curves, and graphs, which facilitates remote meter reading and analysis and research of electric energy. The system is safe, reliable and stable. It provides real and reliable basis for users of substations to solve electricity problems and has achieved good social benefits. [2]
references:
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guide of Digital Measurement of Electric Power Measurement [M]. Beijing. China Electric Power Press. 2007. 4
[2]. Zhou Zhongbian. Smart grid customer power monitoring and power management system product selection and solution [M]. Beijing. Mechanical Industry Press. 2011.10 Â
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