Abstract: With the continuous expansion of power usage and the improvement of the complexity of the project, various units in the country have strengthened their attention to the power system, and began to build a high-level monitoring system for the power system, and strive to achieve the operation of the power system by means of the monitoring system. Effective control, and thus avoid the emergence of various problems to improve the safety, smoothness and stability of power applications. In order to improve the monitoring system, in recent years, the technical staff has gradually increased the research work on the monitoring system, and began to use the new technology to transform the existing monitoring system, which has greatly helped the construction of the current monitoring system. . This paper introduces the application of power monitoring systems in the field of airport transportation through the application of substations in the Linzhi Airport project.
Keywords: power system; airport; monitoring system; distribution monitoring;
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 the airport through the construction of the power monitoring system of the Linzhi Airport project.
1 Project overview and construction goals
The Linzhi Airport Project is located in the Yarlung Zangbo River Valley in Milin County, Nyingchi City, 50 kilometers away from Bayi Town, Bayi District, Nyingchi City, 2949 meters above sea level, below the 4334m Changdu Bangda Airport and 3570m Lhasa Gongga International Airport. The altitude is ranked 12th in domestic civil airports. In order to ensure the flight safety of the unique high altitude airport of the Linzhi Airport route, the navigation equipment installed at the airport has two sets of instrument navigation systems, one set of instrument landing system, one set of VHF omnidirectional beacons and two sets of precision approach channel indicators. At the same time, the airport also installed wind profile radar to monitor the wind speed and direction of the surrounding area. This equipment is only available in Linzhi Airport and Jiuzhaigou Airport. In order to ensure the reliable supply and distribution of the facility, the power monitoring system is configured to monitor and save data in real time for later management.
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 high and power distribution circuits in the station, 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 station in time. When the load of the power system in the station 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, which is convenient for the relevant personnel to analyze the power consumption status of each part of the station, so that the power usage activities in the station are safer, thereby ensuring the life safety of the station personnel and improving the station staff. Work efficiency.
2.1 System Structure
According to the distribution of distribution status of Linzhi Airport, 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 as shown:
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 in the communication layer is the N2S16-485I-ETS 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 field is equipped with a positive electric energy meter to realize three-phase current, three-phase voltage, frequency, power, four-quadrant electric energy and other electrical parameter monitoring of the low-voltage circuit; and monitoring the closing state of each circuit breaker.
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 and accurately to the user, and achieves the automation requirements of the power distribution monitoring, and simultaneously stores the collected data into the database for the user to inquire.
2.3.2 Data report statistics
The power monitoring system reflects the integrity of the measurement system with rich data reports. The system has the function of counting and counting the periodic meter reading of each loop. The user can freely query the power usage of each power distribution node in any time period since the normal operation of the system, that is, the statistical analysis of the power consumption of the incoming line of the node and the power consumption of each branch circuit. Report. This function makes the electricity use visible and transparent, and can be traced when the power consumption error is too large to maintain the correctness of the measurement system.
2.3.3 Alarm information setting and query
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. The power monitoring system can monitor the voltage, current and power through the management personnel, so as to monitor the power distribution situation in real time, whether there is a short circuit or overload, etc., which is convenient for the staff to solve.
2.3.4 User Rights Management
Power monitoring system For the safe and stable operation of the project system, user rights management can prevent unauthorized operations (such as power distribution circuit name modification). You can define login names, passwords, and operation rights for users of different levels, and provide reliable security for system operation and maintenance management.
3 Significance of applying power monitoring system in power supply and distribution design
In summary, the power monitoring system can effectively improve the efficiency of field work and greatly shorten the power-off time. By setting up the power monitoring system, the staff can make correct judgments and input operations in a short time. At the same time, the on-site personnel can simultaneously understand the status of the energy flow, such as checking whether the grid operation is balanced. With a comprehensive understanding of the state of the grid, staff can handle faults in a timely and accurate manner. Timely staff members are not on site, and they can also send text messages to duty personnel to get timely information. According to the actual use of the equipment reflected by the system, it is convenient for the staff to arrange the relevant maintenance work reasonably. In addition, the system can display an overview of the entire network status to help identify fault areas.
Setting up a power monitoring system in transportation and other places can realize real-time monitoring of the low-voltage distribution circuit in the station, 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 station in time. When the load of the power system in the station 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, which is convenient for the relevant personnel to analyze the power consumption status of each part of the station, so that the power usage activities in the station are safer, thereby ensuring the safety of the personnel in the station and improving the work of the staff. effectiveness.
 "Guidelines and Application Guidelines for Digital Measurement of Electric Power Measurement", Ren Zhicheng, Zhou Zhong, China Electric Power Press
 "Application of Power Monitoring System in Power Supply and Distribution Design", Gao Shihong, Technology Wind