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Abstract: This paper introduces the Fujian Star Network Ruijiecheng power monitoring system, which uses intelligent power meters to collect various electrical parameters and switching signals from the power distribution site. The system adopts the on-site local networking mode. After networking, it communicates through the fieldbus and travels to the background. Through the Acrel-2000 power monitoring system, the real-time monitoring of the power distribution circuit of the substation is realized.
Key words: industrial site; 0.4KV substation; intelligent power meter; Acrel-2000; power monitoring system
0 Overview
Fujian Star Network Ruijie Communication Co., Ltd. was established in 1996. The company adheres to the business philosophy of “integrating innovative technology and building a smart future†and is a leading provider of ICT application solutions in China. In 2014, the company's brand value was 13.213 billion yuan. In June 2010, Starnet Ruijie successfully listed (stock code: 002396) and became a public company with independent innovation to build its core competitiveness.
As the country's first batch of innovative enterprises, Star Network Ruijie forged an independent innovation system with enterprise research as the core and open cooperation. There are more than 7,000 employees in Star Network, among which R&D technicians account for more than 40% of the company's total number. Each year, about 10% of sales revenue is invested in R&D. In 2014, R&D investment reached 540 million yuan. As the country's first batch of technological innovation demonstration enterprises, Starnet has repeatedly undertaken and selected the National Torch Program, the National 863 Program, and the National Nuclear High-Level Major Project, forming a large number of core technologies with domestic and international leading levels, as of 2015 In the month, a total of 1998 patents were applied.
Based on strong innovation capabilities, Star Network Ruijie in the field of network communications, switches, cloud computing terminals, thin clients, payment POS, "desktop cloud", wireless access, broadband access, unified communications, video information applications Each has formed a unique leading edge, and is also committed to bringing forward-looking application solutions to emerging applications such as mobile Internet, cloud computing, Internet of Things, next-generation networks, smart campus, big data, etc., and successfully entered Russia, Markets such as India, Southeast Asia, Africa, and the United States show the unique charm of “Created in China†to customers around the world.
This project is the power monitoring system of Fujian Star Network Ruijie Substation. According to the requirements of power distribution system management, it is necessary to separately monitor the high voltage cabinets and low voltage distribution lines in the two substations of Fujian Star Network Ruijie to ensure the safety, reliability and efficiency of power consumption.
The Acrel-2000 low-voltage intelligent power distribution 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 the variable power distribution system. The secondary equipment of the power distribution system is networked, and the field devices of the distributed power distribution stations are connected as an organic whole through the computer and the communication network to realize remote monitoring and centralized management of the power grid operation.
1 System structure description
The monitoring system mainly realizes the power consumption monitoring of the 10/0.4kV power distribution system of two substations of Fujian Star Network Ruijie Communication Co., Ltd. The monitoring range of the high voltage part is 7 Xuji WXH-831A and WCB-831A series microcomputer protection and control devices installed on the high voltage cabinet; the low voltage part monitoring range is the T1, T2, T3, T4, T5 and T6 transformers on the low voltage cabinet of the substation. Low-voltage incoming cabinets, communication cabinets, feeder cabinets. The high-voltage system has a total of 7 microcomputer protection and monitoring devices connected directly to the serial server by a bus. The low-voltage system 144 ACR330ELH and ACR220EL models of multi-function power meters, divided into 7 buses, collect and process data through the serial port server, and finally connect through the network cable. On the duty monitoring indoor host, the data connection between the instrument on the bus and the monitoring host is realized.
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) Network topology diagram
The interval device layer is mainly: microcomputer integrated protection, multi-function network power meter, and the like. 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, 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 above network instruments adopt RS485 interface and MODBUS-RTU communication protocol, RS485 adopts shielded line transmission, generally adopts two connections, the wiring is simple and convenient; the communication interface is half-duplex communication, that is, both sides of the communication can receive and send data but Only data can be sent or received at the same time, and the maximum data transmission rate 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.
2 main functions of power monitoring system
The project is used for power monitoring of the 10/0.4kV power distribution system of this substation; the monitoring range is the low voltage incoming cabinet, the communication cabinet and the feeder of the T1, T2, T3, T4, T5 and T6 transformers in the substation. Remote real-time monitoring of cabinets and high-voltage side meters.
The ACR330ELH and ACR220EL multi-function power meters are used in the incoming and outgoing circuits. It is a network power meter designed for 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 energy, reactive power and other electrical parameters. And the instrument has photoelectric isolation switch input contact and relay control output contact, these contacts can be used with the intelligent circuit breaker to realize the remote signaling and remote operation of the circuit breaker. This series of network power meters are mainly used in substation automation, distribution network automation, residential power monitoring, industrial automation and other fields.
The low-voltage loop real-time monitoring, the secondary diagram of the low-voltage power distribution is shown in Figure (2). 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. And the three-phase current of the circuit is allocated; the remote signal function realizes the operation state of the field device, mainly including: the switch's branching and closing operation state and the communication fault alarm; when the circuit breaker is displaced, an alarm signal is issued to remind the user to deal with it in time. malfunction.
Figure (2) Low-voltage power distribution quadratic diagram
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. See picture (3).
Figure (3) Real-time remote 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, as shown in Figure (4).
Figure (4) 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. See picture (5).
Figure (5) Schematic diagram of system communication structure
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 (6).
Figure (6) Trend graph
4 Conclusion
With the development of society and the wide application of electric power, the power monitoring system has become an inevitable choice for large-scale multi-substation users such as key projects, landmark buildings/large public facilities throughout the country. This paper introduces the Acrel-2000 power monitoring system. In the implementation of Fujian Star Network Ruijie, real-time monitoring of the power consumption of high and low voltage distribution circuits in substations can be realized. 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 pop-up alarm dialog box and voice prompt for the closing and closing of the load, and generates various energy reports, analysis curves, Graphics, etc., facilitate remote meter reading and analysis and research of electrical energy. The system is safe, reliable and stable, and provides a real and reliable basis for enterprises to solve the problem of electricity consumption, and has achieved good economic benefits. [2]
references:
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guide of Digital Measurement of Electric Power Measurement [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: Chen Wei (1989-), female, Jiangsu Ankerui Electric Manufacturing Co., Ltd., technical engineer, the main research direction is intelligent power monitoring and power management system. Technical exchange fax mobile phone QQ home page: http://
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