An Kerui Cui Tingyu
Jiangsu Ankerui Electric Appliance Manufacturing Co., Ltd.
Abstract: This paper introduces the archives of National Road School Campus of Shanghai University of Finance and Economics. Comprehensive protection devices and smart power meters are used to collect various electrical parameters and status signals at the distribution site. The system adopts the method of site-to-site local networking. After networking, it communicates via the field bus and transmits it to the background. The Acrel-2000 power monitoring system realizes the real-time monitoring and management of substation power distribution and transformation circuits.
Keywords: Shanghai University of Finance and Economics; 10KV substation; comprehensive protection device; smart power meter; Acrel-2000; power monitoring system.
0 Overview
Shanghai University of Finance and Economics covers an area of ​​826 acres with three campuses. The main campus is located at No. 777, Guoding Road, Zhongshan No.1 Campus is located at No. 369 Zhongshan North First Road, and Kunshan Road Campus is located at 146 Kunshan Road.
This project undertakes the construction of the power monitoring system of the transformer and distribution substation of the National Archives Campus. The Archives has a total of 2 lines of 10KV into the line. After 2 transformers of 2000KVA are transformed, the entire archives will be powered. The integrated protection device and temperature in the substation Controllers, multi-function instruments and other devices use the RS485 bus network to access the power monitoring system. The system host is installed in the duty room within the substation.
1 Demand analysis
The power monitoring system needs to implement centralized data management, analysis and processing. The software probably functions as follows:
The monitoring information such as voltage, current, power, power factor and frequency is refreshed in real time and visually and dynamically displayed in a single graph. Each circuit sub-screen displays information on each circuit's electrical parameters and circuit names.
A trend curve is drawn for each circuit's current to facilitate analysis of the circuit's distribution operating conditions.
The power collection function of each loop can be used to generate a power report that meets customer management requirements during the time period.
Real-time communication status display for each loop meter.
Multi-user rights management facilitates hierarchical operations.
This technical condition applies to the transformer and distribution room of the archives of the National Road School Campus of Shanghai University of Finance and Economics. The supplier's products should have high safety and reliability, be easy to expand, and be easy to maintain and maintain. The product provided by the supplier shall meet at least the technical conditions, but it is not limited to this. The technical performance of the supplier shall meet the requirements for data monitoring of the power distribution room.
2 system solutions
The monitoring system mainly implements power monitoring and power management for the power distribution and distribution of the archives of the National Road School Campus of Shanghai University of Finance and Economics. The monitoring scope is integrated protection devices, temperature controllers and multi-function instruments of the power distribution station. The system accesses 6 comprehensive protection devices for the power distribution and distribution facilities, 29 PZ96-E4/KC multi-function instruments, and 2 transformer temperature controllers. It is divided into 5 buses. The bus directly connects to the serial server in the substation and passes through the network. The data is uploaded to the host of the duty station of the substation, thereby realizing the data connection between the instrument on the bus and the monitoring host on the monitoring host. As shown in the following figure: Station management layer, network communication layer and field device layer.
1) Station control management
Station management The management personnel of the power monitoring system are the direct windows of human-computer interaction. Mainly refers to the industrial computer, display, UPS, etc. placed in the duty room.
2) Network communication layer
The communication layer is mainly composed of protocol isolated converters and bus networks. The main function of the protocol isolation converter is to monitor on-site smart meters, integrated protection devices, and transformer temperature controllers; the main function of the bus network is to realize data exchange, make the distribution system management centralized, information, and intelligent, and greatly improve the distribution. The security, reliability and stability of the electrical system have truly reached an unattended purpose.
3) Field device layer
The field device layer is a data acquisition terminal, which is mainly composed of Ankorei intelligent instrument PZ96-E4/KC, comprehensive protection device, DC screen, and transformer temperature controller. The instrument passes the shielded twisted pair RS485 interface and adopts MODBUS protocol bus type connection. Access to the communication server, through the communication server to the power distribution monitoring host for networking, remote monitoring.
Smart meter on-site connection
The on-site instrument is connected in a hand-in-hand manner through shielded twisted pair (RVVSP2*1.0). Each bus connects about 25 smart meters. Then the data is uploaded to the serial server and the data is uploaded to the local monitoring terminal. The specific connection diagram is as follows:
3 system function
Features
The system adopts an all-Chinese interface, which is simple and convenient to operate; stable and reliable; the system has a system diagram display, simulation diagram display and network structure diagram display; the system provides a friendly human-machine interface, all operations can be carried out on the interface, And it has a remote display function.
login interface
In order to ensure the safe and stable operation of the system, user rights management functions have been set up. User rights management can prevent unauthorized operations (such as distribution circuit name modification, etc.). Define login names, passwords, and operation rights for users at different levels to provide reliable security for system operation and maintenance. The user's level is divided into three levels: operator, engineer, and system administrator. Each level can be assigned to a different operation authority, including entering operation, exiting operation, and report management. The system administrator is the highest level user. Users at a higher level can add or delete the next level of users.
The interface of the monitoring system is divided into three sections, title interface, power distribution system interface and menu switching interface.
The title screen shows the current login user and system current time.
The current interface corresponds to various parameters displayed in the system interface.
The buttons arranged in the menu switching interface are the function switching buttons of the system. Different function buttons can enter the corresponding function interface.
Distribution monitoring interface
Power distribution monitoring
You can view the distribution and connection of the distribution circuits and the main electrical parameters. The main data includes: three-phase current, electric energy. Above the busbar (both horizontal lines) the number (eg 1P1) represents the switchgear
When you choose to log in to the system as "Administrator", you can click on the loop name in the system diagram once to directly modify the loop name. After the modification, the system will save it automatically.
Communication status
The communication status of each device in the access system can be displayed in real time, and the entire system network structure can be completely displayed. The network communication status of the system can be diagnosed online. When a network failure occurs, faulty units and fault locations can be automatically displayed on the screen. In this way, the system maintenance personnel can easily grasp the communication status of each device on the site in real time, timely maintain the abnormal equipment, and ensure the stable operation of the system.
Communication state diagram
The communication status can see the distributed network structure of the entire system, which has network diagnostic functions. The system network communication status can be monitored in real time. When a network failure occurs, the system automatically displays faulty circuits and specific units. Red indicates that the communication is normal, and green indicates that the instrument is out of communication. Inform the maintenance personnel to check the cause of the failure.
Electrical Parameters Report
The storage and management functions of real-time power parameters and historical power parameters, all real-time collected data, sequential event records, etc. can be saved to the real-time database. In the monitoring screen, you can customize the parameters to be queried, the time period of the query, or the number of records that were recently updated by the query, and display them by means of reports. This function is convenient for users to conduct accident retrospective inquiries.
Set the time required to query, click the query button to query the electrical parameters report of each circuit at a certain moment in history. The main data includes: three-phase voltage, three-phase current, active power, reactive power, power compensation factor, and electric energy.
This report contains all the loops. Help users to understand whether the voltage instability, current limit, power, and power factor meet the requirements during system operation at each moment. Based on this, the system is better managed and optimized.
Reports can be exported in a spreadsheet format with printing capabilities. Click Print Report and print the report as needed.
Energy report
The integrity of the measurement system is reflected in rich data reports. The system has the functions of periodical meter reading and statistics collection. Users can freely inquire about the power usage of each distribution node in any time period since the normal operation of the system, that is, the power consumption of the node's incoming line and the power consumption of each branch circuit. Report. This function makes electricity visible and transparent, and can trace back when the error of power consumption is too large, and maintain the correctness of the measurement system.
Energy report function
The management of electricity consumption is presented in the form of a report. The report can present the power consumption of each circuit during any period of time during the operation of the system. Each inlet circuit and its outlet circuit are produced in a table, which facilitates the query. .
By adjusting the start time and the end time, the power consumption during this time period can be displayed.
The report can be exported in a spreadsheet format with printing capabilities.
Current limit setting
The current limit setting was designed for each circuit of the power distribution system. It is convenient for distribution maintenance personnel to timely set the limit of the electricity consumption current according to the electricity demand of the site. When the current exceeds the limit, the power consumption of the loop can be controlled in a timely manner to ensure the reliability of the electricity supply and provide protection for the users' rights and interests.
Current limit setting
Alarms and events
Real-time alarm
The real-time alarm window monitors the telemetry collected by the system. The alarm window opens automatically when the system is running and remains hidden in the background.
When the current or voltage exceeds the limit and the alarm limit is reached, the corresponding real-time alarm window will automatically pop up and display the specific alarm information in red font: the circuit name, the over-limit electrical parameter, and the alarm value.
Historical alarm
By adjusting the start time and end time, you can query the system alarm information in any time period in the past, including telemetry alarms and remote alarms, as well as the specific alarm time, alarm type, and alarm content.
4 Conclusion
In the application of power distribution facilities today, the distribution security of substations is of utmost importance. The application of the Acrel-2000 power monitoring system described in this article can be implemented in the archives of the National Road School Campus of Shanghai University of Finance and Economics. The real-time monitoring of the power distribution circuit can not only show the power status of the circuit, but also has the function of network communication. It can be combined with serial servers and computers to form the power monitoring system. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, and has a pop-up alarm dialog box, voice prompts, and a short message warning light, and generates various energy reports. , Analysis of curves, graphics, etc., to facilitate remote meter reading and analysis, research, the system is safe, reliable, stable, to provide a real and reliable basis for solving electricity problems.
references:
[1]. Ren Cheng, Zhou Zhongzhong. Principles and Application Guide for Digital Meters for Electric Power Measurement [M]. Beijing. China Electric Power Press, 2007. 4
[2].Zhou Zhouzhong, et al. Product Selection and Solution for Smart Grid User-end Power Monitoring and Power Management System[M]. Beijing. Machinery Industry Press. 2011.10
About the author: Cui Tingyu, male, undergraduate, Jiangsu Ankerui Electric Manufacturing Co., Ltd., the main research direction for intelligent building power supply and distribution monitoring system. Email:el.cn QQ Mobile Phone Fax Website: http://
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