Yang Junjun
1 Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
0 Overview
The Shanghai Environmental Monitoring Center was established in 1983. It is a public welfare science and technology unit engaged in environmental monitoring. It is affiliated to the Shanghai Environmental Protection Bureau. It is under the guidance of the China Environmental Monitoring Center and is a national environmental monitoring first-class station.
The Shanghai Environmental Monitoring Center is mainly responsible for environmental quality monitoring and pollution source monitoring in Shanghai's administrative jurisdiction, including water, atmospheric environmental quality, soil, solid waste, environmental noise, and environmental monitoring in sensitive areas, such as drinking water sources. Mouth. Provide technical supervision, technical support and technical services for environmental management and decision-making in the city. It is the network center, technology center, information center and training center of the city's environmental monitoring system.
Sanjiang Road Block Shanghai Environmental Monitoring Center Replacement and Relocation Business Building Project is located at No. 301 Street, Caohejing Street, Xuhui District (Sanjiang Road, Longjing Road). The project area is about 8,000 square meters and the proposed total area is 23,760 square meters. The building is divided into a comprehensive business building, a laboratory building, an atmospheric monitoring building, and an auxiliary business building.
The project undertakes the power monitoring system of its power distribution and distribution station. The power distribution station is powered by two 10KV power supplies. After a transformer with a load of 1250KVA and a transformer with a load of 1600KVA, the comprehensive business building of the Shanghai Environmental Monitoring Center , the laboratory building power supply.
1 Demand analysis
There is a transformer room on site. The system needs to implement centralized data management and analysis processing. Requirements are as follows:
About the power distribution monitoring system:
Set up a power distribution monitoring system for real-time monitoring of smart devices. The monitoring system includes monitoring host, eight-channel communication management machine, power isolation module, industrial network switch, communication cabinet, data processing workstation, power distribution management system software, UPS, printer and other equipment. The monitoring system is connected to the equipment in the station through the field bus to ensure the communication quality. The monitoring host hardware adopts the brand industrial special computer, the CPU frequency should be no less than 2.0Hz, the memory capacity should be no less than 2GB, and the hard disk capacity should be no less than 500GB. The monitoring host should use an LED display with a size of not less than 19 inches. Printer: A4 format black and white laser printer.
System performance requirements are as follows:
The system should be displayed in full Chinese interface. From the dead zone of the data acquisition device input to the running station CRT display ≤ 5s. From the data acquisition device input state quantity displacement to the running workstation CRT display ≤ 3s. The whole system real-time data scanning period is ≤3s. The whole frame of the screen is called response time real-time picture ≤ 2s, other pictures ≤ 3s. The real-time data refresh cycle of the screen is ≤4s. The I/O measurement and control unit adds the mutation amount to the data processing and communication device MODEM or the gateway machine exit time: the telemetry is ≤3s, and the remote signal is ≤2s. Has the ability to communicate with third parties.
Instrument requirements:
Function: measure three-phase AC current, phase/line voltage, active/reactive power, active/reactive power, power factor, frequency, etc.; externally provide power supply DC220V±25%; accuracy level: voltage, current 0.2, active Power level 0.5, active power level 1; communication port: RS485 communication; communication protocol: Modbus protocol;
Communication frequency: 4800/9600bps. The selection of the brand of power distribution monitoring system and the power meter and network communication management machine should be produced by the same manufacturer, and Shanghai Ankerui products should be selected.
This technical condition applies to the power distribution room of the Shanghai Environmental Monitoring Center. Supplier products should be highly safe and reliable, easy to expand, and easy to maintain and maintain. The products provided by the supplier shall meet at least the technical conditions, but not limited to this, and its technical performance shall meet the requirements for data monitoring of the power distribution room.
2 system plan
The monitoring system mainly realizes power consumption monitoring and power management for the substation of Shanghai Environmental Monitoring Center. The monitoring scope is 10KV integrated protection device, DC screen, transformer temperature controller and low-voltage multi-function instrument. The system is connected to 2 sets of 10KV integrated protection devices, 1 DC screen, 2 transformer temperature controllers and 69 low-voltage multi-function meters, which are divided into 6 buses (the comprehensive protection device adopts Super Category 5 network communication). The bus directly accesses the data collector in the substation, and the super five types of network cables directly access the network switch in the substation, thereby implementing data communication between the meter on the bus and the monitoring host on the monitoring host. As shown in the figure below: station management layer, network communication layer and field device layer.
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System network topology
1) Station management
The management of the power management system for the station management is a direct window for human-computer interaction. In the main refers to the industrial computer, display, UPS, etc. placed in the duty room.
2) Network communication layer
The communication layer is mainly composed of ANet communication management machine, Ethernet equipment and bus network. The main function of ANet communication management machine is to monitor on-site intelligent instrument, integrated protection device, DC screen, transformer temperature controller; the main function of Ethernet equipment and bus network is to realize data interaction, make distribution system management centralized, information, intelligent It greatly improves the safety, reliability and stability of the power distribution system, and truly achieves the goal of unattended operation.
3) Field device layer
The field device layer is a data acquisition terminal, which is mainly composed of a smart meter, an integrated protection device, a DC screen, and a transformer temperature controller. The smart meter is connected to the communication server through a shielded twisted pair RS485 interface and a MODBUS communication protocol bus type connection. The server arrives at the power distribution monitoring host to perform networking and remote monitoring.
Smart meter field connection
The field instruments are connected by hand-shielded through the shielded twisted pair (RVVSP2*1.0). The number of smart meters connected to each bus is less than 32. In view of past experience, the smaller the number of bus meters, the faster the response time. Bus 20 meters left and right), and then upload the data to the Anet communication management machine (Note: the comprehensive insurance uses super five types of network cable for communication), and then upload the data to the local monitoring terminal. The specific connection diagram is as follows:
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3 system function
Features
The system adopts full Chinese interface, and the operation is simple and convenient; the operation is stable and reliable; the system has a system diagram display, simulation diagram display and network structure diagram display; the system provides a friendly human-computer interaction interface, and all operations can be performed on the interface. And has a remote display function.
Login management
In order to ensure the safe and stable operation of the system, the user rights management function is set. Unauthorized operations (such as power distribution loop name modification, etc.) can be prevented by user rights management. Define the login name, password, and operation authority of users of different levels to provide reliable security for system operation and maintenance management.
Power distribution monitoring interface management
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Login to the main interface
The buttons arranged on the menu switching interface are the function switching buttons of the system. Different function buttons can enter the corresponding function interface.
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High pressure system display
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Low voltage distribution display
You can view the distribution and connection of each distribution circuit as well as the main electrical parameters. The main data includes: three-phase current, power factor and so on.
Through other device parameters, the interface can display the data collected by the temperature controller and DC screen in real time.
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Temperature controller and DC screen interface
Communication status
The real-time display of the communication status of each device in the access system can completely display the entire system network structure, and can diagnose the network communication status of the system online. When a network failure occurs, the fault unit and the fault location can be automatically displayed on the screen. Therefore, the system maintenance personnel can grasp the communication status of each device in the real-time, and timely maintain the abnormal equipment to ensure the stable operation of the system.
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Communication status map
Green indicates that the communication is normal, and red indicates that the instrument is out of communication. Inform the maintenance personnel in time to check the cause of the failure.
Electrical parameter report
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Real-time power parameter storage and management functions, all real-time data collected, sequential event records, etc. can be saved to the real-time database. Can intuitively view the current power consumption of the loop.
Energy report
The integrity of the measurement system is reflected in a rich data report. The system has the function of counting and counting the periodic meter reading of each loop. The user can freely query the power consumption 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.
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Day, month, year report tool
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Report format
The management of power consumption is presented in the form of a report, which can present the power consumption of each loop in any period of time during the operation of the system, which can be easily queried.
The report can be exported as a spreadsheet with print capabilities.
Load curve
A load curve is designed for the total incoming line of the distribution system (or the exit of the critical load). It is convenient for distribution and maintenance personnel to keep abreast of the demand of power consumption and the load of power supply system to ensure the reliability of power supply and provide guarantee for the energy use rights of user units. With this function, it is also possible to analyze the growth trend of energy demand, adjust the demand declaration in a timely manner, and reduce the excess payment due to excessive deviation of demand.
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Load curve function
The X axis of the curve chart represents the time span, and the Y axis represents the range, which can display the day curve of the incoming circuit;
The load curve helps the user to perform power quality analysis and fault analysis.
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 there is current or voltage limit and the alarm limit is reached, the “Real-time real-time alarm†window will pop up automatically, and the specific alarm information will be displayed in red font: loop name, over-limit electric parameter, alarm value, etc.
Historical alarm
It can query system alarm information in any past time period, including telemetry alarm and remote alarm, including specific alarm time, alarm type and alarm content.
4 Conclusion
In today's power distribution facilities, the distribution safety of substations is of paramount importance. The application of the Acrel-2000 power monitoring system described in this paper in the Shanghai Environmental Monitoring Center can be used for power distribution and distribution circuits in substations. The real-time monitoring of electricity not only can display the power consumption of the loop, but also has the function of network communication, and can form a power monitoring system with the communication management machine and computer. The system realizes the analysis and processing of 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 prompt, SMS alarm light for the closing and closing of the load, and generates various energy reports. Analyze curves, graphs, etc., to facilitate remote meter reading and analysis and research of electric energy. The system is safe, reliable and stable, providing a real and reliable basis for the factory to solve the problem of electricity consumption, and has achieved good business benefits.
references:
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Power Electrical Measurement Digital Instrumentation [M]. Beijing. China Electric Power Press. 2007. 4
[2]. Zhou Zhongbian. Smart grid customer power monitoring and power management system product selection and solution [M]. Beijing. Mechanical Industry Press. 2011.10
About the Author
Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
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