Introduce the Acrel-3000 power management system, using intelligent power meters to collect various electrical parameters of the power distribution site. The system adopts the on-site local networking mode. After the network is connected, it is transmitted to the monitoring background through the fieldbus communication. The Acrel-3000 power management system realizes the real-time monitoring, analysis and management of the power distribution circuit.
Yang Junjun
Ankerui Electric Co., Ltd., Jiading, Shanghai 201801, China;
0 Overview
Zibo City Occupational Disease Prevention and Control Institute was founded in 1970. It is responsible for the health monitoring of occupational diseases, the diagnosis and treatment of occupational diseases and the rehabilitation of workers with occupational injuries (occupational diseases). It is located in the road of Nanjing Road and Zhongrun Road in Zibo New District. Southwest is the largest professional institution for occupational disease prevention and control in China. On May 9, 2015, the hospital added the “Sixbo People's Hospital of Zibo City†brand and officially became a municipal comprehensive hospital.
The hospital mainly has three sets of transformers (10KV/0.4KV) and several 0.4KV feeder circuits.
1 Customer needs
The annual input cost of electricity in hospitals is relatively large. The main reasons for the quality of electricity use and the details of electricity consumption are not clear. It has caused a lot of confusion to the electricity management personnel. According to their actual conditions, the following requirements are proposed:
â— When the current of the transformer exceeds the limit, it cannot be known by the management personnel in real time. There is a hidden danger in the safe use of electricity, and the system needs to implement the SMS alarm function.
â— Manual meter reading cannot be accurate to the specific department's electricity consumption, and it is impossible to truly achieve internal performance assessment.
â— Real-time monitoring of transformer real-time current, voltage, power and energy consumption fluctuations.
â— It is necessary to be able to check the daily electricity consumption of a certain loop or several loops, and compare them to form a pie chart and a bar graph.
â—Each transformer can check the energy consumption of the day, the energy consumption of the day and the energy consumption value of the same period.
â— The system can achieve year-on-year and aspect ratio analysis functions.
â— The system can be accessed remotely, so that the administrator can view the working status of the electrical circuit of the engineering system at any time.
According to the needs of users, it is necessary to establish Acrel-3000 power management system (mainly real-time data monitoring and energy consumption data processing analysis) for Zibo City Occupational Disease Prevention and Control Institute, set up monitoring platform in the duty room, real-time monitoring, statistics and analysis of the loop. Ensure safe, reliable and efficient use of electricity.
Acrylic's Acrel-3000 power management system makes full use of the latest developments in modern electronic technology, computer technology, network technology and fieldbus technology, and performs distributed data collection and centralized monitoring and management of variable power distribution systems. The secondary equipment of the power distribution system is networked, and the field devices of the distributed power distribution stations are connected into an organic whole through the computer and the communication network to realize remote monitoring, centralized management and energy efficiency analysis of the power grid operation.
2 system structure description
The monitoring system adopts a hierarchical distributed structure, that is, the station control layer, the communication layer and the interval layer; as shown in Figure (1):
Figure (1) Acrel-3000 power management system network topology
The interval device layer is mainly: smart meter, switch quantity, analog quantity acquisition module and frame circuit breaker. These devices are respectively installed in the electrical cabinet corresponding to the corresponding primary equipment. These devices all adopt RS485 communication interface, and realize on-site data collection through the on-site MODBUS bus networking communication.
The network communication layer is mainly: communication server, its main function is to collect the scattered devices in the field, and remotely transmit to the station control layer to complete the data interaction between the field layer and the station control layer.
Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers, SMS alarm modules, alarm buzzers and other equipment. The monitoring system is installed on the computer to collect and display the running status of the field device and display it to the user in the form of human-computer interaction.
The intelligent watt-hour meter added after the transformation adopts RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded cable transmission. Generally, two connections are used, and the wiring is simple and convenient. The communication interface is half-duplex communication, that is, both sides of communication can be used. Receive and send data but only send or receive data at the same time, the maximum transmission rate of data is 10Mbps.
The RS485 interface is a combination of balanced driver and differential receiver. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus with a maximum transmission distance of 1.2km.
3 Acrel-3000 power management system main function
3.1 Data Acquisition and Processing
Data collection is the basis of power distribution monitoring. Data acquisition is mainly completed by the underlying multi-function network instrument, realizing local real-time display of remote data. The signals that need to be collected include: three-phase voltage U, three-phase current I, frequency Hz, power P, power factor COSφ, electrical Epi, and remote device operating status.
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.
3.2 Human-computer interaction
The system provides a simple, easy to use, and good user interface. Using the full Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low-voltage power distribution system, showing the status of the power distribution system equipment and the corresponding real-time operating parameters, the screen timing wheel patrol switching; the screen real-time dynamic refresh; analog quantity display; switch quantity display; continuous Record display, etc.
3.3 diachronic events
The diachronic event viewing interface mainly provides convenient and friendly human-computer interaction for the user to view the fault records, signal records, operation records and over-limit records that have occurred. Through the historical event viewing platform, you can conveniently locate you according to your own requirements and query conditions. The historical events to be viewed provide good software support for you to grasp the operation of the entire system.
3.4 Database Establishment and Query
It mainly completes remote measurement and remote signal timing collection, and establishes a database to generate reports on a regular basis for users to query and print.
3.5 User Rights Management
For different levels of users, set different permission groups to prevent the loss of production and life caused by human error, and achieve safe and reliable operation of the power distribution system. Users can log in, log out, change passwords, add deletes, etc. through user management, which is convenient for users to modify accounts and permissions.
3.6 Operating load curve
The load trend curve function is mainly responsible for timing the important loop current and power load parameters, and automatically generating the running load trend curve, which is convenient for the user to know the running load condition of the equipment in time. Click the corresponding button or menu item to complete the corresponding function switching; you can view the real-time trend curve or historical trend line; you can perform translation, zoom, range conversion and other operations on the selected curve to help users enter the line trend analysis and fault recall. Analysis of the health of the entire system provides intuitive and convenient software support.
3.7 Remote Report Query
The main function of the report management program is to design the report style according to the needs of the user, and filter the data processed in the system to generate the report data required by the user. The program can also use the timed save, print or summon save and print mode for the report file according to the user's needs. At the same time, the program also provides users with the function of generating report file management.
The report has the function of freely setting the query time to realize the energy statistics, data export and report printing of day, month and year.
3.8 System Energy Analysis Function
It can realize the year-on-year and loop analysis of the energy consumption system; query the peak, flat and valley electricity values ​​according to the custom time period; and calculate the energy efficiency ratio of a certain group according to the energy consumption of the team.
4 Case analysis
According to the loop of the project site, the system can display the loop operation status in real time. The function has the power telemetry to monitor the electrical parameters of the running equipment, including: line three-phase voltage, current, power, power factor, electric energy, frequency and other electrical parameters. See picture (2)
Figure (2) System power distribution quadratic diagram
The telemetry alarm function mainly completes the specific alarm position and audible alarm for the transformer and main transformer load over-ejecting alarm interface, and reminds the on-duty personnel to deal with it in time. The load limit is freely set under the corresponding authority. With historical query function, see Figure (3).
Figure (3) Over-limit alarm information
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. The user can directly print the report and save it to other locations in EXCEL format. Figure (4) Transformer energy statistics report.
Figure (4) Energy report
Parameter meter reading function, mainly the electrical parameters of all loops are entered into the line. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of a distribution loop, including: three-phase voltage, three-phase current, active power, reactive power, frequency, 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 in Figure (5).
Figure (5) Parameter reading
Real-time power factor monitoring function, real-time alarm of low power factor system, the user repairs or replaces the equipment of the loop according to the power factor condition. The power factor report is shown in Figure (6).
Figure (6) Power factor trend chart
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, see Figure (7).
Figure (7) Current trend graph
The system can set different permission groups for different levels of users, to prevent losses caused by human error in production and life, and to achieve safe and reliable operation of the power distribution system. Users can log in, log out, change passwords, add deletes, etc. through user management, which is convenient for users to modify accounts and permissions.
After the investment of the whole system, according to the subsequent management of energy conservation and equipment renovation and energy conservation, the company can save a lot of cost every year.
4 Conclusion
The Acrel-3000 power management system can collect the main transformer and transformer energy consumption data of the whole enterprise in the production process in real time, and monitor all data online, and alarm the data with abnormal energy consumption in the process. It is also possible to provide data analysis and comparison functions in the form of charts or data tables for energy consumption information in the process, through horizontal comparison between equipment and equipment, between departments and departments, or between weeks and weeks, months and months. Compare and find out the waste and hidden dangers in the process of energy consumption. By designing various statistical reports to users to establish a hospital energy consumption equipment evaluation system and department energy consumption assessment management system to optimize the hospital's energy consumption, so that employees can change from the past passive energy conservation to active energy-saving ideology to improve hospital energy consumption. Use efficiency.
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
JINING SHANTE SONGZHENG CONSTRUCTION MACHINERY CO.LTD , https://www.sdkomatsugenuineparts.com