Introduce the Suzhou High-tech Zone Science and Technology Building, using intelligent power meters, collecting various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After the network is connected, it communicates through the fieldbus and travels to the background. The Acrel-2000 power monitoring system realizes the real-time monitoring and management of the power distribution circuit power distribution. EVA Deck Pad for Kiteboard Deck Pad and Sup Deck Pad comes in two ways normally. One is full sheet for DIY, the other one is die cutting based on customized design.
Yang Junjun 1
1 Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
Overview
Suzhou High-tech Zone Science and Technology Building has a total construction area of ​​about 100,000 square meters. The 10 buildings in the project are the Suzhou Information Center, which will provide basic support for the scientific management, clean and efficient service of Suzhou High-tech Zone.
This project mainly involves 9 low-voltage power distribution stations of 9 building power distribution stations, in which the duty room is placed in the duty room of each floor power distribution station.
1 Demand analysis
In order to ensure the statistics and analysis of the electricity load for production management and real-time monitoring of dangerous sources. Real-time online monitoring of voltage, current, power and other parameters of low-voltage distribution cabinets and power transformers at the production site is required. Once the monitoring point is abnormally monitored, the alarm can be detected in time, and the relevant personnel take necessary measures to avoid the occurrence of a safety accident. The automatic meter reading function saves manpower and material resources. The power trend curve function can intuitively display the working status and time of each loop, which is convenient for users to find out abnormal power circuits and timely rectify. This project is a large-scale public construction demonstration project. Some data such as electrical parameters are uploaded to the BA building automation system.
This technical condition applies to the low-voltage cabinets of the distribution room of the Science and Technology Building of Suzhou High-tech Zone. 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.
data collection
Automatically collect analog data of all power meters in the field, and automatically collect switch data such as field switch status and fault status.
Support real-time acquisition, automatic cycle acquisition (timed acquisition) configurable cycle (1 minute to 24 hours).
Support data transmission correctness test, abnormal data automatic processing.
Support multi-thread processing mechanism, improve data collection efficiency, and can collect data for multiple devices at the same time.
The real-time data display adopts the visual display mode of the main wiring diagram of the power distribution room, and the circuit breakers are disconnected and the fault status is visually visible.
Data analysis and processing
Comprehensive statistics and analysis of data need to achieve the following functions:
The statistics and calculations of the hours, days, months, and years of the electricity consumption data of each equipment.
The maximum, minimum, and average values ​​of the electrical load (active, reactive) of each device are calculated.
Count the electricity consumption (active, reactive) of each substation and the whole.
Data query and display
It is required to facilitate the query of the client and the query of the management personnel at all levels. The query interface can meet the requirements of managers at all levels and can support flexible conditional combination query and comparative analysis. The data of various statistical analysis can flexibly adopt various charts such as reports. Intuitive display function.
The data display function can be divided into three levels: operation layer, management layer and decision layer according to the different permissions of different users.
The operation layer has functions such as energy analysis, cumulative usage, real-time monitoring, operation record and ratio, comparison, and benchmark analysis.
The management has functions such as energy statistics and analysis, classification and classification, and benchmarking.
The decision-making layer has functions such as energy data analysis, data deletion, and database import/export.
authority management
It is required to assign different roles to different users, and can authorize function submenus, specific file records, data records, and the like.
The system requires a reasonable and complete user security control mechanism to effectively protect the information resources in the application environment and prevent information loss, theft and destruction.
Energy-saving renovation and effect evaluation
It is required to provide data support for energy-saving retrofits and to provide an evaluation of the effects before and after energy-saving retrofits.
parameter settings
The transformer transformer ratio can be set through the collection cabinet, and various current and voltage protection settings can be set.
Fault judgment and alarm have automatic fault diagnosis and use sound and light mode alarm function. The types of alarms include switch faults, voltage and current overruns, communication faults in the field acquisition module, and communication faults with the monitoring system. The alarm time is automatically recorded in the system database, which is convenient for users to inquire. The staff can grasp the real-time running status of the variable power station at any time, find the fault of the power distribution and operate accordingly, improve the management efficiency of the power distribution and improve the safety of the power system. reliability.
2 system plan
According to the actual situation of the Science and Technology Building of Suzhou High-tech Zone, the overall network structure of the Acre-2000 system is directly connected to the data collector of the power distribution station and then directly connected to the monitoring host of the switchgear to ensure the power distribution. The stability and real-time performance of the power monitoring system transmission. According to the customer's demand, the distribution facilities of the 9 buildings on the site are separately opened for power distribution monitoring. The 9 systems are consistently arranged and distributed in the distribution halls of each floor. Take the overview of the 5# building distribution station as an example. The introduction is as follows: station management layer, network communication layer and field device layer. 
A total of 59 ACR220EL on the site 5# building distribution station is divided into 3 RS485 buses connected to the data collector of the power distribution station, 8 ACX6100B connected to 1 RS485 bus to the data collector of the power distribution station, and 2 LD- The B10-10F is connected to one RS485 bus and connected to the data collector of the power distribution station. The data collector is directly connected to the monitoring host of the duty room through the super five network cable.
1) Station management
The management of the station control management system for the power monitoring system is a direct window for human-computer interaction. In the Suzhou High-tech Zone Science and Technology Building Project, it mainly refers to the monitoring host placed in the power distribution station.
2) Network communication layer
The communication layer is mainly composed of a Nport5610-8, a protocol isolation converter, an Ethernet device and a bus network. The main function of the Nport5610-8 data collector is to monitor the on-site intelligent instrument; the main function of the Ethernet device and the bus network is to realize the data interaction between the substation and the main station, so that the distribution system management is centralized, informationized and intelligent. Greatly improve the safety, reliability and stability of the power distribution system, and truly achieve the goal of unattended.
3) Field device layer
The field device layer is a data acquisition terminal, which is mainly composed of smart meters. The smart meter is connected to the communication server through the shielded twisted pair RS485 interface, and uses the MODBUS communication protocol bus type connection to reach the communication host through the communication server. Implement remote control.
Smart meter field connection
The field instruments are connected by hand-tightly through the shielded twisted pair (RVSP2*1.0). The number of smart meters connected to each bus is about 20, and different types of smart devices are connected to different buses, and then the data is uploaded to the data. The collector Nport5610-8, and then upload the data to the local monitoring terminal. The specific connection diagram is as follows: 
The ACR220EL multi-function liquid crystal display instrument is used for the incoming and outgoing circuit. It is a network power meter designed for power monitoring needs of power systems, public facilities and intelligent buildings. It can measure all conventional power parameters, such as three-phase voltage and current. Active power, reactive power, power factor, frequency, active power, reactive power, temperature controller can monitor the temperature of the transformer in real time.
3 system function
The real-time monitoring system diagram of the power distribution station is the main monitoring screen, which mainly monitors the running status of all the circuits of the power distribution station in real time. Red represents the closing and green represents the opening. In the system diagram, you can visually see the operating parameters and status of each incoming and outgoing line. You can see all the conventional power parameters on the outgoing side of the transformer, such as: three-phase voltage, current, active power, reactive power, and power factor. , frequency, active power, etc. As shown below: 
Power distribution system 
Loop detailed electrical parameters
The remote signal and telemetry alarm function mainly completes the switch operation status and load line monitoring of the low-voltage outlet circuits. The switch position and load limit alarm pop-up alarm interface indicates the specific alarm position and audible alarm, reminding the on-duty personnel to deal with it in time. The load limit is freely set under the corresponding authority. With historical query function, as shown below: 
Alarm function history query
The event alarm recording function mainly completes the alarm information event record and the occurrence time of the alarm time period, provides the basis for the on-duty personnel and analyzes the cause of the accident, as shown in the following figure: 
Alarm function real-time query
The parameter meter reading function mainly queries the electric parameters of the low-voltage outlet circuits. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of each low-voltage circuit of the transformer outlet of the treasury payment center, including: three-phase current, active power and active power. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown below 
Electrical parameter reading
The power consumption report function can select the time period for query, support the electricity cumulative query for any time period, and have the functions of data export and report printing. Provide accurate and reliable energy reports for duty personnel. The loop name of the report is associated with the database, which is convenient for the user to modify the loop name. As shown in the figure below, the precise power consumption of the distribution circuit of the office building of the office building is displayed. The user can directly print the report and save it to other locations in EXCEL format. As shown below: 
Energy report
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a layered distributed structure and monitors the communication status of the interval layer devices. Red indicates normal communication and green indicates communication failure. The figure below shows the communication status of the power distribution station. 
Communication structure diagram
The load trend curve interface can be used to visually check the load operation of the loop. View real-time and historical trend curves, click the corresponding button or menu item on the screen to complete the corresponding function switching; help users to enter the trend analysis and fault recall, with curve printing function. Provides intuitive and convenient software support for analyzing the health of the entire system. As shown below: 
Trend graph
4 Conclusion
In today's distribution facilities, the distribution security of public office buildings is crucial. The application of the Acrel-2000 power management system in Suzhou High-tech Zone Technology Building can realize the distribution of power distribution. The real-time monitoring of the loop power can not only display the power consumption of the loop, but also have the network communication function, and can form a power management system with the communication management machine and the computer. The system realizes the analysis and processing of the collected data, and displays the running status of each distribution circuit in the power distribution station in real time. It has pop-up alarm dialog box, voice prompt, SMS alarm light, and generates various energy reports for the closing and closing of the load. Analyze curves, graphs, etc., to facilitate remote meter reading and analysis and research of electric energy. The system is safe, reliable and stable, and provides a reliable and reliable basis for solving large-scale public construction problems.
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, Technology Wind
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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