Abstract: The power monitoring system of Jiuling Apartment in Suzhou Industrial Park was introduced. Intelligent power meters were used to collect various electrical parameters and switch signals at the distribution site. The system adopts the on-site local networking method. After networking, it communicates via the fieldbus and transmits it to the background. The Acrel-2000 power monitoring system realizes real-time monitoring and power management of the power distribution circuit.
Keywords: public facilities; Suzhou Industrial Park Jiuling Apartment Project; substation; smart power meter; Acrel-2000; power monitoring system
0 Overview
The Suzhou Industrial Park Jiuling Apartment Project is located in the Suzhou Industrial Park. In the southeastern part of the Jiuling Apartment Block, a nursing home building is built with an area of ​​1428.08m2 and a building area of ​​11,199.18 m2. Nursing homes are social units that are open to the outside world and there are a total of 112 rehabilitation wards.
This project is the power monitoring system for the Suzhou Industrial Park Jiuling Apartment Project. According to the requirements of power distribution system management, it is necessary to perform power management on the low-voltage distribution outlet circuit in the substation of the Suzhou Industrial Park Jiuling Apartment Project in order to ensure the safety, reliability and efficiency of electricity use.
Acrel-2000 low-voltage intelligent power distribution system makes full use of the development of modern electronic technology, computer technology, network technology and field bus technology, and conducts decentralized data acquisition and centralized monitoring and management of the power distribution system. The secondary equipment of the distribution system is networked. Through the computer and the communication network, the field devices of the decentralized power distribution station are connected into an organic whole, and the remote monitoring and centralized management of the power grid operation is realized.
1 System Structure Description
The monitoring system mainly realizes the power supply monitoring and power management of the power distribution system of Suzhou Industrial Park Jiuling Apartment Project. The monitoring range is 162 ACR210EL/K produced by Ankerui in a substation, and the bus is pulled directly to the duty by 7 buses. Room collector, after the protocol conversion access monitoring duty room monitoring host, in order to achieve the bus on the meter and monitoring host data connectivity.
The monitoring system adopts a hierarchical distributed structure, namely station control layer, communication layer and bay layer;
As shown in Figure 1:
Figure (1) Network topology
Interval device layer is mainly: multi-function network power meter. These devices are corresponding to the corresponding primary equipment installed in the electrical cabinet, these devices are used RS485 communication interface, through the on-site MODBUS bus network communication, data acquisition on the spot.
The main network communication layer is: a communication server. The main function of the communication server is to collect the scattered data at the site collection device, and transmit it to the station control layer at the same time, to complete the data exchange between the field layer and the station control layer.
Station control management: equipped with high-performance industrial computers, monitors, UPS power supplies, printers and other equipment. The monitoring system is installed on the computer to collect and display the operating status of the field equipment and display it to the user in the form of human-computer interaction.
The above network instruments all adopt RS485 interface and MODBUS-RTU communication protocol. RS485 adopts shielded wire transmission. Generally, two wires are used to connect the wires. The connection is simple and convenient. The communication interface is half-duplex communication, that is, both parties can receive and send data. Only data can be sent or received at the same time, and the data transmission rate is 10Mbps.
The RS485 interface is a combination of balanced drivers and differential receivers. It has enhanced noise immunity and allows up to 32 devices to be connected on the bus. The maximum transmission distance is 1.2 km.
2 main functions of the power monitoring system
2.1 Data Acquisition and Processing
Data acquisition is the basis of power distribution monitoring. Data collection is mainly accomplished by the underlying multi-function network instrumentation, 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, power Epi, and remote device operating status.
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.
2.2 Human-computer interaction
The system provides simple, easy to use, and good user interface. Using the Chinese interface, the CAD graphic shows the electrical main wiring diagram of the low voltage distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters, the screen timing switching tour; dynamic refresh of the screen real-time; analog display; switch display; continuous Record display and so on.
2.3 Historical events
The historical event viewing interface provides convenient and friendly human-computer interaction for the user to view fault records, signal records, operation records, and over-limit records that have occurred. You can view the platform through historical events. You can easily locate your own according to your requirements and query conditions. The historical events that you want to view provide you with good software support for the overall system operation.
2.4 Database Establishment and Query
It mainly completes the remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.
2.5 User Rights Management
For different levels of users, different permission groups are set to prevent the losses caused by human misoperation to production and life, and to realize the safe and reliable operation of the distribution system. You can use user management to perform user login, user logout, password change, and add/delete operations to facilitate user modification of accounts and permissions.
2.6 Running load curve
The load trend curve function is mainly responsible for regularly collecting incoming lines and important loop current and power load parameters, and automatically generating running load trend curves to facilitate users to know the operating load status of the equipment in a timely manner. Click the corresponding button or menu item of the screen to complete the switching of the corresponding function; 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 the user to enter the trend analysis and fault recall. Analyzing the entire system's operating status provides intuitive and convenient software support.
2.7 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 the data processed in the system is filtered, combined and statistically generated to generate the report data required by the user. This program can also be based on the needs of users of the report file to save, print or summon save, print mode. At the same time, this program also provides users with management functions for generated report files.
The report has the functions of freely setting the query time to realize daily, monthly, and annual energy statistics, data export, and report printing.
3 Case Studies
The power monitoring system of the Suzhou Industrial Park Jiuling Apartment Project is divided into a substation. This project is for the substation's 0.4kV power distribution system for power management. According to the substation monitoring, the operation and management of the substation is completed, and The entire building consumes energy in full control.
The main energy-dissipation circuit of the power distribution center adopts a multi-function electricity meter. Our company also has corresponding model meters and ACR series multi-function meters. It is a network power meter designed for the power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all conventional power parameters such as: three-phase voltage, current, active power, reactive power, power factor, frequency, active power, reactive power and many other electrical parameters. In addition, this instrument has 2 optically isolated digital input contacts. These contacts can be used with intelligent circuit breakers to achieve remote signaling operation of the circuit breaker. The series of network power meters are mainly used in substation automation, distribution network automation, residential power monitoring, industrial automation, energy management systems and intelligent buildings.
The secondary diagram of low-voltage power distribution is shown in figure (2). The main function of the power telemetry is to monitor the electrical parameters of the operating equipment, including: three-phase voltage, current, power, power factor, electrical energy, frequency and other electrical parameters and distribution loops. Three-phase current; remote signal function to display the operating status of field devices, mainly including: switching of the switch, closing operation status and communication failure alarm; when the circuit breaker is dislocated, it will send an alarm signal to remind the user to deal with the fault in time.
Figure (2) Secondary diagram of low voltage distribution
The remote signaling and telemetry alarm functions mainly complete the monitoring of the switching operation status and load incoming line of the low-voltage outlet loops, and indicate the specific alarm position and audible alarm to the switch displacement and load over-limit pop-up alarm interface to remind the on-duty personnel to deal with it in time. The load limit can be set freely under the corresponding authority. With history query function. See Figure (3).
Figure (3) Real-time remote alarm and historical telemetry alarm information query
The parameter reading function mainly inquires into the electrical parameters of the low-voltage outlet circuit. Supports electrical parameter query at any time, with functions such as data export and report printing. The report queries the electrical parameters of the low-voltage loops of the 4 transformer substations for substations, mainly including: three-phase current, active power, active power, and transformer temperature. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. See Figure (4).
Figure (4) Parameter reading
The electricity consumption report function can select the time period to inquire, supports the accumulated electricity inquiry at any time, and has the functions of data export and report printing. Provide accurate and reliable power report for duty personnel. The names of the loops in this report are associated with the database to facilitate the user to modify the loop name. As shown in the figure below, the precise power consumption of each distribution circuit in the substation can be directly printed by the user, and can be saved in another location in EXCEL format. See Figure (5).
Figure (5) Energy Report
The schematic diagram of the system communication structure mainly shows the networking structure of the system. The system adopts a hierarchical distributed structure and simultaneously monitors the communication status of the equipment at the bay level. Red indicates normal communication and green indicates communication failure. See Figure (6).
Figure (6) System Communication Structure
4 Conclusion
With the development of society and the wide application of electricity, the power monitoring system has become an inevitable choice for large-scale multi-substation users, such as key construction projects, landmark buildings, and large-scale public facilities throughout the country. The Acrel-2000 power monitoring system introduced in this paper is introduced. The application of the Jiuling Apartment Project in Suzhou Industrial Park can realize the real-time monitoring and power management of substation high and low voltage distribution circuits. It can not only show the power status of the circuit, but also has network communication functions, and can be used with serial servers. Computers and other power monitoring systems. The system analyzes and processes the collected data, displays the running status of each distribution circuit in the substation in real time, has a pop-up alarm dialog box and voice prompts for the closing and closing of the load, and generates various energy reports and analysis curves. Graphics, etc., to facilitate remote meter reading and analysis, research. The system is safe, reliable and stable. It provides real and reliable basis for users of substations to solve electricity problems and has achieved good social benefits. [2]
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