Anke Rui Qiu Hong

Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd., Jiangyin, Jiangsu 214405 , China

Abstract: Based on the current rapid development of science and technology, people rely more and more on power resources. At this stage, the operating costs of domestic power systems are relatively high. Therefore, it is imperative to improve the work of all aspects of the power system. 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 costs of the power system. This paper introduced the application of the power monitoring system of the Desheng Campus of the Zhejiang Institute of Commerce and Technology. Application in colleges and universities.

Key words: power system; data acquisition; university; monitoring system

0 Preface

Distribution automation is an integrated information management system integrating computer technology, data transmission technology, control technology, modern equipment and management. Its purpose is to improve the reliability of power supply, improve the quality of power, provide users with quality services, reduce operating costs, and reduce the labor intensity of operating personnel.

With the continuous development of the electric power network and the continuous increase in the power load, various new types of loads have emerged. Users are paying more attention to the issue of power quality. At the same time, they also put forward more stringent requirements for power quality. Users need more effective power monitoring and management solutions to meet the challenges brought about by these changes, in order to achieve a continuous, reliable, efficient and low-cost operation of the power distribution system. This article describes the application of power monitoring system in schools through the construction of power monitoring in Zhejiang Vocational College of Commerce.

1 Project Overview and Construction Objectives

Zhejiang Vocational College of Commerce has the Desheng Campus and the Binjiang Higher Education Campus. The two campuses together have a total area of ​​592 acres and a building area of ​​107,300 square meters. Desheng Campus covers an area of ​​40 acres and a building area of ​​27,000 square meters. This project is on Desheng Campus. The school has already established a power monitoring system with Binjiang Campus in 2013. This time, the construction of the Desheng Campus Power Monitoring System has improved the distribution system automation management of the entire school.

The Desheng Campus has a total of 1 substation, which is mainly 0.4kV and a total of 29 circuits;

In the 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 power, reactive power, apparent power, power factor, frequency, switching state, and residual current.

1.2 Telecommunication: The system is required to deliver the equipment operation status and fault information in a timely manner;

1.3 Alarm: The system is required to set alarms for various information;

1.4 Display: Requires the system to display information about each part of the operation locally;

1.5 Upload: Desheng Campus monitoring data is transmitted to the Binjiang Campus's total system via Ethernet.

2 Design of power monitoring system

In the design of the monitoring system, we must fully consider the actual needs of customers, as well as the actual structure of the power system, the actual load capacity of the power system, and other factors, and then choose a reasonable monitoring equipment, which is not only conducive to reducing the cost of system operation, but also It is conducive to the realization of system functions. The power monitoring system of this project can realize the real-time monitoring of the distribution circuit in the building and is conducive to the management of power. On the other hand, the power monitoring system can not only accurately show the power status of the loop, but also has network communication and other functions. It can be combined with computers, serial servers and other devices to display the status of each distribution circuit in the building. When the load of the power system in the building exceeds the standard, the power monitoring system can quickly report an alarm and issue a voice prompt. In addition, the power monitoring system can also generate statistical information such as reports and graphs, which facilitates the analysis of power consumption in various parts of the building and makes the power activities in the building more secure, thereby ensuring the safety of people in the building and improving office work. Personnel work efficiency.

2.1 System Structure

According to distribution of school distribution room, the construction of power monitoring system adopts a hierarchical distributed structure. The system includes: station management layer, network communication layer, and field device layer. System network structure below:

The direct window of human-computer interaction between the management and management personnel of the management team and the computer calculates, analyzes, and processes various types of data collected on the site, and reflects the operating status of the site in terms of graphics, digital display, sound, etc. The upper part. Mainly by the system software and necessary hardware equipment, such as industrial-grade computers, printers, UPS power supply and other components.

The device used by the communication layer is Nport5232. This layer is a bridge for data information exchange. It is responsible for the collection, classification, and transmission of data information sent back by field devices, and it also conveys various control commands from the upper computer to the field devices.

The field device layer is mainly connected to various types of instruments used for the collection and measurement of electrical parameters in the network, and it is also a necessary basic element for constructing the power distribution system. According to the actual characteristics of this project, PZ80-E4/KC smart meters are installed for each circuit of the low-voltage power distribution circuit during the design of the project to realize the three-phase current, three-phase voltage, frequency, power, and electrical parameters of each circuit. Monitor and monitor the status of each breaker circuit breaker.

2.2 Network Design

The network system in the power monitoring system can transmit data in time and quickly transfer operation instructions, which is the basis for realizing various functions of the power monitoring system. For the Zhejiang Electric Vocational and Technical College electric power monitoring system, there are few monitoring devices in the system and are distributed in one distribution time. Therefore, a communication collection box can be configured in the distribution room and all data can be 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 customer's actual needs and realizes a main wiring diagram interface display; electric parameter telemetering and electric parameter crossing limit alarm; event recording; system operation abnormality monitoring; fault alarm and operation record; report query and printing; system load real-time , history curve, user rights management and other main functions.

2.3.1 Data Acquisition and Processing

Data acquisition mainly includes analog and digital acquisition. The acquisition of analog quantity mainly collects the information of line voltage, current, power, power factor, frequency, etc. The collection of switch quantity is mainly the working status of the circuit breaker, isolation switch, grounding switchgear and other equipment, and the power-off protection. Alarm information such as operation faults is collected to realize local real-time display of remote data. The data processing mainly displays the electrical parameters collected according to requirements in real time and accurately to the user, so as to meet the requirements of automation and intelligence of the power distribution monitoring, and store the collected data in the database for user query.

2.3.2 Data Record

The data recording function of the power monitoring system is mainly to record the sequence of the circuit-breaker split-up state and protection action. It requires that there must be enough memory space in the system, and then a long time and a large amount of data information is recorded and stored. Secondly, the data recording function of the power monitoring system also includes the recording of fault information, that is, recording and storing the real-time current, real-time voltage and other data when the fault occurs. It can be seen that the data recording function can accurately reflect the problems existing in the system through the recording of the working status of the protection device and the recording of the fault information, thereby facilitating the solution of the staff.

2.3.3 Remote Operation

The remote operation of the power monitoring system includes remote monitoring, long-distance communication, remote control, etc., and realizes the 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 assessment of the status makes it easier for the staff to operate the isolation switch and other equipment 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 artificial operating system must be designed. When the power monitoring system fails, it can be handled manually.

2.3.4 Power Management

In order to realize the supervision of the power consumption of each circuit, the system designs a power management report. The system automatically generates daily reports, monthly reports and annual reports, and has report printing functions according to the different names of the circuits when collecting the active power. The electricity consumption in a certain period of a certain loop can be inquired, which can help to establish an effective energy management assessment system. Through the construction of the system and the establishment of the system, the awareness of energy conservation in the management staff of the companies that have settled in the enterprises has been greatly enhanced, and the energy consumption of schools has been effectively saved.

3 Significance of Application of Power Monitoring System in Power Supply and Distribution Design

In summary, the power monitoring system helps power units to improve efficiency, reduce losses, and reduce operating costs. The power monitoring system can effectively ensure the efficiency of power grid management and reduce the cost of power operation. It also becomes an important component in the design of power supply and distribution. section. The power monitoring system's functions such as communication, fault alarm, and data storage and recording make the staff more convenient in practical work. Through the man-machine interface, the operating status of the power system can be directly understood and the operating instructions can be quickly transmitted. The transmission of data by devices is achieved through network transmission. Therefore, different power monitoring systems can be designed with different networking methods to ensure that data information can be transmitted quickly and accurately. On the other hand, in the power supply and distribution design using the power monitoring system, monitoring equipment should be selected based on the actual situation. The general power monitoring system usually uses devices with long-distance communication, remote observation, and remote control functions, while some high-end power monitoring systems require smart devices with more complete functions. The installation of power monitoring systems in business buildings, office buildings, schools and other places can achieve real-time monitoring of high- and low-voltage distribution circuits in buildings, which is conducive to power management. On the other hand, the power monitoring system can not only accurately show the power status of the loop, but also has network communication and other functions. It can be combined with computers, serial servers and other devices to display the status of each distribution circuit in the building. When the load of the power system in the building exceeds the standard, the power monitoring system can quickly report an alarm and issue a voice prompt. In addition, the power monitoring system can also generate statistical information such as reports and graphs, which facilitates the analysis of power consumption in various parts of the building and makes the power activities in the building more secure, thereby ensuring the safety of people in the building and improving office work. Personnel work efficiency.

references

[1] "Principles and Application Guide for Power Electronic Measurement Digital Meters", Ren Chengcheng, 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] "Electric Power Monitoring Applied to 10kV Power Supply and Distribution Design", Yao Qiang, Science and Technology World

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