Introduce the Xi'an Hot Spring Outlet Power Monitoring System, which uses AM4 microcomputer protection device to collect various electrical parameters and switching signals of the 10kV high voltage cabinet at 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.
Yang Junjun
1 Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
0. Overview
Xi'an Xi'an Hot Spring Outlet Cultural Tourism Co., Ltd., adjacent to Xiqiao Expressway in the north, Fenghuang Avenue in the south, east and west with Fuyang 2nd Road and 3rd Road, with a business area of ​​more than 50,000 square meters, is the national tourism and leisure area of ​​Linyi, Xi'an Key construction projects, the project is 20 kilometers away from Xi'an main city, 30 minutes by car, covers an area of ​​157.04 acres, developed in two phases, the first phase of land use 91.68 acres, the project will be built into a European town with an area of ​​70,000 square meters, 270 Shops, 1,500 parking spaces, can radiate from Xi'an to surrounding cities, relying on Linyi's 10 million visitors per year to create a true outlet resort.
This project is a new substation for the Xi'an Hot Spring Outlet Project. According to the requirements of power distribution system management, it is necessary to carry out power monitoring on the high-voltage input and output lines in the substation of the plant to ensure the safety, reliability and efficiency of electricity consumption. There are two power distribution rooms in the project. Among them, 9 10KV high voltage cabinets that need to be monitored are located in No. 1 transformer and power distribution room. 9 10KV high voltage cabinets have one 10KV input line cabinet, one measuring cabinet and one PT cabinet. , six outlet cabinets. A total of AM4-U, AM4-I seven, is divided into two RS485 buses to access the power monitoring system, the system host is installed in the duty room next to the first power distribution room.
The Acrel-2000 power monitoring system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and performs distributed data collection and centralized monitoring and management of the variable power distribution system.
1. System structure description
The monitoring system mainly realizes the electricity monitoring of the 10kV power distribution system of the Xi'an Hot Spring Outlet Project; the monitoring scope is the AM4 microcomputer comprehensive insurance installed on the 8 high voltage cabinets of the new substation, and the real-time monitoring of the comprehensive insurance is carried out remotely. The system has a total of 8 microcomputer comprehensive insurance (including 1 AM4-U, 7 AM4-I), divided into 2 buses, which are directly connected to the duty room through the shielded twisted pair cable to the duty room. The model is Nport5232I. The serial port of the serial server realizes the data connection between the meter 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):
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Topology diagram
Interval device layer: Microcomputer integrated warranty for AM4 model. These microcomputer comprehensive insurances are installed on the 10kV incoming line cabinet, PT cabinet and outlet cabinet respectively, and adopt RS485 communication interface to realize data field collection through on-site MODBUS bus networking communication.
Network communication layer: MOXA's Nport5232I serial 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 microcomputer comprehensive insurance adopts 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 communication can receive and send data but in Only data can be sent or received at the same time, and the maximum data transmission rate is 10 Mbps.
The RS485 interface is a combination of balanced driver and differential receiver. It has enhanced anti-noise capability. It can connect up to 6 microcomputers on the bus. The maximum transmission distance is 1.2km.
2. Main functions of power monitoring system
2.1 Data Acquisition and Processing
Data acquisition is the basis of power distribution monitoring. Data acquisition is mainly completed by the AM4 model microcomputer integrated safety system installed on the high voltage cabinet to realize local real-time display of remote data. The signals that need to be collected include: electrical parameter information of each circuit, as well as the switching state of the distribution circuit switch, the grounding knife state and related faults, alarm signals and other data.
The data processing mainly displays the data collected according to the requirements to the user in real time, 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
The 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 Fault alarm and accident recall
When an operation failure occurs in the power distribution system, an audible alarm will be issued in time to prompt the user to respond to the fault circuit in time, and the time and loop name of the event will be automatically recorded for the user to inquire and recall the cause of the failure.
2.4 Database Establishment and Query
It mainly completes remote measurement and remote signal timing collection, and establishes a database to generate reports on a regular basis for users to query and print.
2.5 User Rights Management
For different levels of users, set different permission groups to prevent the loss of production and life caused by human error, and 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 Operating 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, which is convenient for the user to 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, range conversion and other operations on the selected curve to help users enter the trend analysis and fault recall.
3. Design of power monitoring system
In the design of the monitoring system, it is necessary to fully consider the actual needs of the customer, as well as the actual structure of the power system, the actual load capacity of the power system, etc., and then rationally select the monitoring equipment, which is beneficial to reduce the cost of the system operation, and also Conducive to the realization of system functions.
The Xi'an Hot Spring Outlet Project needs to monitor the power consumption of the 10kV power distribution system; the monitoring scope is the AM4 microcomputer comprehensive insurance installed on the 8 high voltage cabinets of the new substation. The power monitoring system of the project can display the operating status of each 10kV power distribution cabinet in time. When the power load of a certain circuit exceeds the standard, the power monitoring system can quickly alarm and issue a voice prompt. In addition, the power monitoring system can also generate statistical information such as reports and graphs, so that relevant personnel can analyze the power consumption status of each part, ensure the safety of personnel, and improve the work efficiency of the on-duty personnel.
The real-time picture is shown in the following figure. It is the main monitoring screen of the system. It mainly monitors the running status of the high-voltage circuit in real time, and visually displays the distribution of the distribution line in the form of a power distribution once-trunk diagram. At the same time, the electrical parameters of each loop collected in real time are And the switching state of the distribution circuit switch, the grounding knife state and related faults and alarm signals are displayed in real time in the system interface. Red means closing, green means opening, and when the circuit breaker is displaced, an alarm signal will be sent to remind the user to handle the fault in time. At the same time, under the authority of the administrator, the switching control of the high voltage circuit breaker can be performed remotely.
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High pressure system
The data recording function of the power monitoring system is mainly to record the switching state of the circuit breaker and the sequence of protection actions. It requires sufficient memory space in the system, so that the data information is recorded and stored for a long time. Secondly, the data recording function of the power monitoring system also includes recording of fault information, that is, recording and storing data such as real-time current and real-time voltage at the time of occurrence of the fault. It can be seen that the data recording function can accurately reflect the problems existing in the system by recording the working state of the protection device and recording the fault information, thereby facilitating the staff to solve.
The system has storage and management functions for real-time power parameters and historical power parameters. All real-time data collected, sequential event records, etc. can be saved to a real-time database. In the monitoring screen, you can customize the parameters that need to be queried, the time period of the query, or select the number of records that have been updated recently, and display them in a report mode. This feature makes it easy for users to conduct accident tracking queries.
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Electrical parameter 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. The following figure shows the state of the substation communication.
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Communication structure diagram
The load curve 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.
4 Conclusion
In summary, the power monitoring system helps the power unit to improve efficiency, reduce losses, and reduce operating costs. The power monitoring system can effectively ensure grid management efficiency, reduce power operation costs, and become an indispensable component in power supply and distribution design. section. The power monitoring system's communication, fault alarm, data storage and record functions make the staff more convenient in actual work. They can directly understand the operating status of the power system through the man-machine interface, and can quickly transmit the operation commands. The data transmission of the equipment is realized through network transmission. Therefore, different power monitoring systems can design different networking modes to ensure that data information can be transmitted quickly and accurately. On the other hand, in the power supply and distribution design, the power monitoring system should be used, and the monitoring equipment should be selected according to the actual situation. Generally, power monitoring systems usually use devices with functions such as remote communication, remote observation, and remote control, while some high-end power monitoring systems require smart devices with more complete functions.
The application of Acrel-2000 power monitoring system in the Xi'an Hot Spring Outlet project can realize real-time monitoring of the power consumption of the high-voltage power distribution circuit of the substation. It can not only display the power consumption status of the circuit, but also have the network communication function. Serial port servers, computers, etc. form a power monitoring system. The system realizes the analysis and processing of the collected data, and displays the running status of each distribution circuit in the substation in real time. It has a pop-up alarm dialog box and voice prompt for the closing and closing of the load. 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.
references:
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Power Electrical Measurement Digital Instrumentation [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
About the Author
Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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