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 introduces the power monitoring system through the application of the power monitoring system of Desheng Campus of Zhejiang Commercial Vocational and Technical College. Application in higher education institutions.
Yang Junjun
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 schools through the construction of power monitoring in Zhejiang Commercial Vocational and Technical College.
1 Project overview and construction goals
Zhejiang Commercial Vocational and Technical College has Desheng Campus and Binjiang Higher Education Park Campus. The two campuses cover a total area of ​​592 acres and a construction area of ​​107,300 square meters. Desheng Campus covers an area of ​​40 acres and a building area of ​​27,000 square meters. The project is located in Desheng Campus. The school has already built a power monitoring system at the Binjiang Campus in 2013. The construction of the power monitoring system at Desheng Campus has improved the automation of the distribution system automation of the entire school.
There is a substation in Desheng Campus, which is mainly 0.4kV, with a total of 29 circuits.
In this power monitoring system, the monitoring requirements mainly include the following aspects:
1.1 Remote observation: The system is required to accurately detect current, voltage, active power, reactive power, active energy, reactive energy, apparent power, power factor, frequency, switching state, residual current and other information;
1.2 Remote communication: The system is required to timely transmit the equipment operating status and fault information;
1.3 Alarm: The system is required to alarm various information through setting;
1.4 Display: The system is required to display the operation information of each part on the spot;
1.5 Upload: The monitoring data of Desheng Campus is transmitted to the Binjiang Campus General System via Ethernet.
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 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 office. Staff efficiency.
2.1 System Structure
According to the distribution of the school's power distribution room, the power monitoring system construction adopts a layered and distributed structure. The system includes: station control management layer, network communication layer, and field equipment layer. The diagram below the system network 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 Nport 5232. 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. According to the actual characteristics of the project, the PZ80-E4/KC intelligent instrument is installed in each circuit of the low-voltage distribution circuit during the design of the project to realize the three-phase current, three-phase voltage, frequency, power, electric energy and other electrical parameters of each circuit. Monitoring; and monitoring the closing status 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. For the power monitoring system of Zhejiang Commercial Vocational and Technical College, there are fewer monitoring devices in the system, and they are distributed in one power distribution time. Therefore, a communication collection box can be configured in the power distribution room, and all data is uploaded to the background through the network switch. Monitor 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.
2.3.2 Data Recording
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.
2.3.3 Remote operation
The remote operation of the power monitoring system includes remote monitoring, remote communication, remote control and other links to realize remote control of the power system, enabling the staff to remotely observe the current, voltage and other information, analyze the system failure, and protect the device. The status is evaluated, which makes it easier for the staff to operate the equipment such as the isolating switch remotely, which greatly reduces the workload of the staff. However, in the power supply and distribution design, not only the power monitoring system but also the manual operating system must be designed. When the power monitoring system fails, it can be processed manually.
2.3.4 Power Management
In order to realize the supervision of the electricity consumption of each circuit, 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 according to the collection of the active energy, according to the different circuit names. It can query the electricity consumption in a certain period of time of a certain loop, which can help 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 office workers in each enterprise has been greatly improved, and the energy consumption of the school management office has been effectively saved.
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 commercial buildings, office buildings, schools, etc., can realize real-time monitoring of high and low voltage distribution circuits 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 office. 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, Science and Technology Wind [3] "Power Monitoring for 10kv Power Supply and Distribution Design", Yao Qiang, Technology World
About the Author
Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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