Jianjian Mei'an Kerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
Abstract: Introduce the power monitoring system of Suzhou Bearing Factory Co., Ltd., using intelligent power meter and microcomputer protection device to collect various electrical parameters and switching signals of the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. Through the Acrel-2000 power monitoring system, the real-time monitoring of the power distribution circuit of the substation is realized.
Key words: Suzhou Bearing Factory Co., Ltd.; substation; intelligent power meter; Acrel-2000 type; power monitoring system
Overview <br>Suzhou Bearing Factory Co., Ltd. is located in the Yangtze River Delta, the coast of Taihu Lake, the beautiful industrial city of Suzhou, the Yangtze River in the north, Zhejiang in the south, Shanghai in the east and Taihu in the west. The transportation is convenient and the geographical and economic conditions are unique. Its predecessor was the state-owned Suzhou Bearing Factory. Founded in 1958, it is a backbone enterprise in the original mechanical bearing industry and a large state-owned enterprise. In April 2003, it was transformed into a joint-stock enterprise with natural persons as its main body. It is a high-tech enterprise in Jiangsu Province and a professional company specializing in the production of needle roller and needle roller bearings.
This project is a new substation of Suzhou Bearing Factory Co., Ltd. According to the requirements of power distribution system management, power monitoring of high-voltage incoming and low-voltage distribution lines in the substation of the plant is required to ensure safe, reliable and efficient use of electricity.
The Acrel-2000 low-voltage intelligent power distribution system makes full use of the new development of modern electronic technology, computer technology, network technology and fieldbus technology, and performs distributed data collection and centralized monitoring and management on 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 monitoring and power management of the 10/0.4kV power distribution system of Suzhou Bearing Factory Co., Ltd.; the monitoring scope is the T1 and T2 transformer incoming cabinets of the new substation, the liaison cabinet, and the temperature. Remote monitoring and power management of the controller, high-voltage side meters and comprehensive insurance. The system has a total of 31 instruments (including 26 ACR220E, 3 ABB, 2 temperature controllers), divided into 3 buses, which are directly connected to the host expansion card through the shielded twisted pair pipe to the duty room. To realize the data connection between the instrument on the bus and the monitoring host.
The monitoring system adopts a hierarchical distributed structure, that is, the station control layer, the communication layer and the interval layer; as shown in Figure (1):
figure 1)
The interval device layer is mainly: multi-function network power meter, switch quantity, analog quantity acquisition module and intelligent circuit breaker. 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: communication server, its main function is to collect the scattered devices in the field, and remotely transmit 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, alarm buzzers and other equipment. The monitoring system is installed on the computer to collect and display the running status of the field device and display it to the user in the form of human-computer interaction.
The above network instruments adopt RS485 interface and MODBUS-RTU communication protocol, RS485 adopts shielded line transmission, generally adopts two connections, the wiring is simple and convenient; the communication interface is half-duplex communication, that is, both sides of the communication can receive and send data but Only data can be transmitted or received at the same time, and the data zui has a high transmission rate of 10 Mbps. The RS485 interface is a combination of a balanced driver and a differential receiver. It has enhanced noise immunity and allows up to 32 devices to be connected to the bus. The large transmission distance is 1.2km.
2 main functions of power monitoring system
2.1 Data Acquisition and Processing Data collection is the basis of power distribution monitoring. Data acquisition is mainly completed by the underlying multi-function network instrument, 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, electrical Epi, and remote device operating status.
The data processing mainly displays the electric parameters collected as required in real time to the user, and achieves the automation and intelligent requirements of the power distribution monitoring, and simultaneously stores the collected data into the database for the user to inquire.
2.2 Human-computer interaction system provides a simple, easy-to-use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low-voltage power distribution system, showing the status of the power distribution system equipment and the corresponding real-time operating parameters, the screen timing wheel patrol switching; the screen real-time dynamic refresh; analog quantity display; switch quantity display; continuous Record display, etc.
2.3 The diachronic event duration event viewing interface is mainly for the user to view the fault records, signal records, operation records, and over-limit records that have been made to provide convenient and friendly human-computer interaction. Through the historical event viewing platform, you can customize the requirements according to your own requirements and query conditions. It is convenient to locate the historical events you want to view, and provide good software support for your operation of the entire system.
2.4 Database establishment and query mainly complete remote measurement and remote signal collection, and establish a database to generate reports for users to query and print.
2.5 User Rights Management For different levels of users, set different permission groups to prevent loss of production and life due to human error, and to achieve safe and reliable operation of the power distribution system. Users can log in, log out, change passwords, add deletes, etc. through user management, which is convenient for users to modify accounts and permissions.
2.6 Operation load curve The load trend curve function is mainly responsible for timing the incoming line and important loop current and power load parameters, and automatically generating the running load trend curve, so that users can know the running load status of the equipment in time. Click the corresponding button or menu item to complete the function switching; you can view the real-time trend curve or historical trend line; you can perform translation, zoom, and range conversion on the selected curve to help users enter the line.
Potential analysis and fault recollection provide intuitive and convenient software support for analyzing the health 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 filter the data processed in the system to generate the report data required by the user. The program can also use the timed save, print or summon save and print mode for the report file according to the user's needs. At the same time, the program also provides users with the function of generating report file management.
The report has the function of freely setting the query time to realize the energy statistics, data export and report printing of day, month and year.
Case Study 3 10 / 0.4kV Distribution System <br> Bearing Co., Ltd., Suzhou is power monitoring and power management; monitoring the new substation in the range of T1, T2 transformer line counters, cabinets contact, temperature controller, High-speed side meters and comprehensive insurance for remote real-time monitoring and power management.
The incoming circuit uses ACR230ELH multi-function harmonic instrument, which 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 all conventional power parameters, such as three-phase voltage, Current, active power, reactive power, power factor, frequency, active power, reactive power, and can monitor a variety of electrical parameters such as 2-31 harmonic components of voltage and current. And the instrument has 4 photoelectric isolation switch input contacts and 2 relay control output contacts, these contacts can be used with the intelligent circuit breaker to realize the remote signaling and remote operation of the circuit breaker. 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 important distribution circuit adopts ACR220EFLK series network power meter, which mainly completes three-phase current, three-phase voltage, active power measurement, multi-rate energy measurement, switch signal detection and relay remote output. [1]
The real-time picture on the high-voltage side is shown in Figure (2). It is the main monitoring screen of the system. It mainly monitors the running status of the high-voltage circuit in real time. Red represents the closing, green represents the opening, and the circuit breaker will issue an alarm signal when the displacement occurs, reminding the user to handle the fault in time. . The ABB REF615 protector is used in the high-voltage section of the 10KV project. The software interface displays the operating status of the comprehensive insurance in real time and displays the measured parameters of the comprehensive insurance in real time.
Figure (2) High-pressure system
The secondary diagram of low-voltage power distribution is shown in Figure (3). 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 distribution loop. Three-phase current; the remote signal function realizes the operation status of the field device, 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 (3) Secondary diagram of low-voltage power distribution
The parameter meter reading function mainly completes the inquiry of the electrical parameters of the low-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 the low-voltage circuits of the two transformers for the substation, including: three-phase current, active power and active energy. 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. See picture (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
The load trend curve interface can be used to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item on the screen to complete the corresponding function switching; help users to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the health of the entire system. See Figure (7).
Figure (7) trend graph
4 Conclusions <br>With the development of society and the wide application of electric power, the power monitoring system has become an inevitable choice for large-scale multi-substation users such as key projects, landmark buildings/large public facilities throughout the country. -2000 power monitoring system in Suzhou Bearing Factory Co., Ltd. can realize real-time monitoring of power consumption of high and low voltage distribution circuits in substation, not only can display the power consumption status of the circuit, but also have network communication function, and can be connected with serial server. Computers and the like constitute a power monitoring system. The system realizes the analysis and processing of the collected data, displays the running status of each distribution circuit in the substation in real time, and has pop-up alarm dialog box and voice prompt for the closing and closing of the load, and generates various energy reports, analysis curves, Graphics, etc., facilitate remote meter reading and analysis and research of electrical energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for the users of the substation to solve the problem of electricity consumption, and has achieved good social benefits. [2]
references:
[1]. Ren Zhicheng Zhou Zhong . Principles and Application Guide of Digital Meters for Electric Power Measurement [M]. Beijing . China Electric Power Press . 2007. 4
[2]. Zhou Zhongbian . Product selection and solution for smart grid customer power monitoring and power management system [M]. Beijing . Mechanical Industry Press . 2011.10
About the author: Yan Jianmei, female, undergraduate. Served unit: Currently working for Ankerui Electric Co., Ltd., :,,,: http://it.shacrel.cn
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