The power monitoring system plays an important role in the entire power system. It can effectively promote the efficiency of power grid management and reduce the operating cost of the power system. This paper is applied in the project of the 12th International Conference Center of Liaoning Province. PPR Pipe Fittings,Standard PPR Pipe Fittings,Excellent PPR Pipe Fittings Hebei Lanwei Imp. & Exp. Co., Ltd. , https://www.hblanwei.com
Yang Junjun
Ankerui Electric Co., Ltd. Shanghai Jiading
0 Preface
Distribution automation is a comprehensive information management system integrating computer technology, data transmission technology, control technology, modern equipment and management. Its purpose is to improve power supply reliability, improve power quality, provide quality services to users, reduce operating costs, and reduce the labor intensity of operators.
With the continuous development of power networks, the continuous increase of power load, various new types of loads continue to emerge, users pay more attention to power quality issues, but also put more stringent requirements on power quality. Users need more effective power monitoring and management solutions to meet the challenges of these changes in order to achieve continuous, reliable, efficient and low-cost operation of the distribution system. This paper introduces the application of power monitoring system in public buildings through the construction of the power monitoring system of the 12th National Conference Center of Liaoning Province.
1 Project overview and construction goals .jpg)
Liaoning International Conference Center is located in Qipanshan Development Zone. It was invested by Shanghai Greenland Group with an investment of 6.6 billion yuan. It is a supporting project for the 12th National Games.
The Liaoning International Conference Center has a total construction area of ​​550,000 square meters and will be completed and put into use in March 2013. After the completion of the Liaoning International Conference Center, it will become an international conference center, sports venue, hot spring resort, commercial and residential in Liaoning Province. Comprehensive high-end project.
The entire project has three large buildings, namely the hotel, the conference center, and the fitness center. There is a central substation in each building that is responsible for the overall power supply of the entire building.
2 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 power monitoring system of the project can realize real-time monitoring of the low-voltage distribution circuit in the building, which is beneficial to power management. On the other hand, the power monitoring system can not only accurately indicate the power consumption status of the circuit, but also has the functions of network communication, etc., and can be combined with computers, serial servers and other devices to display the operation status of each power distribution circuit in the building in time. When the load of the power system in the building 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 various parts in the building, and make the electricity activities in the building safer, thus ensuring the safety of the people in the building and improving the business. Staff efficiency.
2.1 System Structure
According to the distribution of power distribution in new shopping malls, the online monitoring system construction adopts a layered and distributed structure. The system includes: station control management layer, network communication layer and field equipment layer. The system network structure is shown in Figure 1. 
Figure 1: System structure
The station controls the management personnel to directly interact with the computer for human-computer interaction, calculate, analyze and process all kinds of data information on the collected site, and reflect the operation status of the site in the form of graphics, digital display, sound, etc., which is the most Upper part. Mainly consists of system software and necessary hardware equipment, such as industrial grade computers, printers, UPS power supplies and so on.
The device used by the communication layer is the NPORT5610 serial server. This layer is a bridge for data information exchange. It is responsible for collecting, classifying and transmitting the data information returned by the field devices, and at the same time relaying various control commands of the host computer to the field devices.
The field device layer is mainly connected to various types of instruments used for electrical parameter acquisition and measurement in the network, and is also a basic component necessary for constructing the power distribution system. The acrel PZ series electric energy meter is configured on site to realize the three-phase current, three-phase voltage, frequency, power, four-quadrant electric energy and other electrical parameter monitoring of the low-voltage circuit; and the closing state of each circuit breaker is monitored. 
Figure 2: One system diagram
2.2 Network Design
The network system in the power monitoring system can transmit data in time and quickly transmit operational commands, which is the basis for realizing various functions of the power monitoring system. Each device in the field is connected to the bus in situ, and then all the buses are connected to the communication gateway to realize the transmission with the host.
2.3 Monitoring system software function design
The system is designed according to the actual needs of the customer, and realizes a main wiring diagram interface display; electrical parameter telemetry and electrical parameter over-limit alarm; event record; system operation abnormal monitoring; fault alarm and operation record; report query and printing; system load real-time Main functions such as history curve and user rights management.
2.3.1 Data collection and processing
Data collection mainly includes analog quantity and digital quantity acquisition. The analog acquisition is mainly to collect the line voltage, current, power, power factor, frequency and other information. The collection of the switch quantity is mainly the working state of the circuit breaker, the isolating switch, the grounding knife and other equipment, and the power failure protection. The alarm information such as running faults is collected to realize local real-time display of remote data. 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. as shown in picture 2.
2.3.2 Data logging
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. As shown in Figure 3. 
Figure 3: Alarm diagram
2.3.3 Power Management
In order to realize the supervision of the electricity consumption of each circuit in the building, the system designed the power management report. The system automatically generates the daily report, the monthly report and the annual report and has the report printing function by collecting the active energy and according to the different circuit names. And can query the electricity consumption in a certain period of time of a certain loop, which can help the property to establish an effective energy management assessment system. Through the construction of the system and the establishment of the system, the energy-saving awareness of the resident managers is greatly improved, and energy consumption is effectively saved, as shown in Figure 4. 
Figure 4: Energy Report
3 Significance of applying power monitoring system in power supply and distribution design
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. Setting up a power monitoring system in public buildings and other places can realize real-time monitoring of the low-voltage power distribution circuit in the building, which is conducive to power management. On the other hand, the power monitoring system can not only accurately indicate the power consumption status of the circuit, but also has the functions of network communication, etc., and can be combined with computers, serial servers and other devices to display the operation status of each power distribution circuit in the building in time. When the load of the power system in the building 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 various parts in the building, and make the electricity activities in the building safer, thus ensuring the safety of the people in the building and improving the work. Staff efficiency.
references
[1] "Guidelines and Application Guidelines for Digital Measurement of Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press
[2] "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Technology Wind
About the author: Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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