Keywords: large-scale public construction; network power meter; power monitoring software 0 Introduction At present, according to the Ministry of Housing and Construction [2008] No. 114 document, government agencies and large-scale public construction should implement an energy consumption measurement system to distinguish the types of energy consumption, and the energy consumption system implements energy consumption household, classification, and itemized measurement, timely Identify and correct energy waste. At the same time, local governments have also actively responded to the central government ’s call, and have also issued relevant regulations. 3. The relevant national and provincial standards shall be implemented during the review of construction drawings. The electrical part clearly stipulates: each outlet circuit of the substation should be equipped with an energy metering device. The metering device should use a digital energy meter, and according to the type and grade of the building, the communication interface should be configured as much as possible to facilitate the formation of the network and set up management Backstage. 1 System structure Figure 1 System topology structure diagram The system uses a distributed structure, divided according to function or area, modular design. The whole system is divided into three layers, namely the field layer, the middle layer and the main control layer. 2 The main function and equipment investment system of the system adopts C / S architecture, data processing is centered on the database, and is divided into modules such as collection, display, and algorithm. The system block diagram is shown in Figure 2. Figure 2 System block diagram The system is designed according to the actual needs of customers, and realizes a main wiring diagram interface display; electrical parameter telemetry and electrical parameter over limit alarm; event record; system operation abnormal monitoring; fault alarm and operation record; report query and printing; system load real-time , Historical curves, user rights management and other main functions. As shown in Figure 3, the electricity consumption trend of each day of the August 4-7 floor air-conditioning main circuit in Building A is shown in Figure 3. Figure 3 Power rod diagram 3 Equipment and investment The total cost of the system hardware including the acquisition device, power supply, workstation host, printing equipment, system software, weak current installation and construction, etc. according to the actual situation of the site is about 350,000 yuan, and the average input cost per building does not exceed 15 Ten thousand yuan. The data of each link of the power distribution can be displayed centrally through the monitoring host, which is convenient for the distribution management personnel to find the fault of the power distribution in time, calculate the power consumption data on a monthly basis, and forward it to the building automatic control system BAS or security system FAS through OPC forwarding. Overall scheduling. Compared with the traditional electrician meter reading and statistics, an additional investment is made, but the degree of intelligence is greatly improved, saving the investment of human capital. 4 Conclusion The article comes from: "Electrical and Electrical" 2011, Issue 2. references: About the Author: Yu Jing, female, undergraduate, engineer of Wuhan Ankerui Electric Co., Ltd., the main research direction is intelligent power monitoring and power management system
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The second phase of Suzhou Pioneer Park is located near the intersection of Zhuyuan Road and Zhujiang Road in Suzhou High-tech Zone. It has a total construction area of ​​135,800 square meters and is composed of three 26-storey independent towers. There is a power distribution room on each floor, and more than 600 network multi-function instruments of Ankerui are installed in the indoor power distribution cabinet. In order to realize the real-time telemetry of power parameters, sub-item management of power metering, power report, etc., the system uses Acrel-3000 power monitoring and power management software to link on-site instruments to achieve centralized management and centralized control.
Acrel-3000 power monitoring configuration software is a special software for collecting and process control of on-site production data. The biggest feature is that it can be used for flexible and diverse "configuration mode" instead of programming mode for system integration, which provides a good The user development interface and simple engineering implementation method, as long as the various software modules preset by it are simply "configured", you can easily implement and complete the functions of the monitoring layer, such as in distributed network applications All applications (such as trend curves, alarms, etc.) refer to remote data in exactly the same way as local data. The "configuration" method can greatly shorten the time for the automation engineer's system integration and improve the integration efficiency.
The topological structure of the second phase of Suzhou Venture Park's power monitoring system is shown in Figure 1.
1.1 Field layer The main task of the field layer is to collect and measure the operating parameters of various power distribution systems on the site, and transmit the collected and measured various data to the monitoring system. Its main equipment is: ACR320EL, ACR210EL network power meters, installed in the power cabinet on each floor. The above devices are independent of each other to complete their respective functions, do not rely on the main control computer to operate, and have an RS-485 communication interface. The detected electrical parameters and status signals are transmitted to the intermediate layer in real time through the on-site RS-485 bus. Unit-communication server.
ACR network measurement and control power meter is an intelligent power meter designed for the power monitoring needs of power systems, industrial and mining enterprises, public facilities, and intelligent buildings. It can measure all common power parameters, such as three-phase current, voltage, active and reactive power, electrical energy, and digital input / output status. This series of instruments have perfect communication and networking functions, can realize remote telemetry and remote control functions, and are very suitable for real-time power monitoring systems.
1.2 Middle layer The middle layer is located between the field layer and the main control layer, and uses a high-performance, embedded communication server. The communication server is responsible for uploading the data collected by the field-level instruments to the main control layer through network communication connection and data exchange, and is the bridge between the main control layer and the field layer.
1.3 Main control layer The main control layer is located in the monitoring room or duty room, and is equipped with high-performance, high-reliability industrial-grade computers, UPS uninterruptible power supplies, printers, and alarm devices. Acrel-3000 power monitoring software is installed on the main control computer, and the real-time monitoring and report management of the entire box system are realized through the software's man-machine interface and various management functions.
The monitoring room of the second phase of Pioneer Park is located on the third floor of Building B. A total of more than 600 ACR meters distributed in the power cabinet on each floor are organically connected through six communication servers. system.
ACREL-3000 power monitoring system has the advantages of good versatility, high reliability and flexible configuration. At present, the system has been in operation for more than half a year, which greatly facilitates users' use. With the popularization of computer information technology, the requirements for the intelligentization of low-voltage distribution are becoming higher and higher. Substation monitoring and control and low-voltage distribution management make the realization of unattended in the distribution room really become a reality. Management analysis of historical operating data and status is convenient for maintenance personnel to clarify equipment status, formulate detailed equipment maintenance plan, reduce manpower investment, improve work efficiency, and thus reduce operating costs of the entire system.
1) "Principle and Application Guide of Electric Power Measurement Digital Instruments" Ren Zhicheng, Zhou Zhong, China Electric Power Press
The design plan of the second phase power monitoring and power management system of Suzhou Pioneer Park
Abstract: This article introduces the application of the Acrel-3000 power monitoring system based on network power meters in the second phase of Suzhou Pioneer Park, which implements intelligent energy metering management and monitoring of decentralized collection and centralized control management. It saves the burden of on-site meter reading by duty personnel, and has the advantages of less investment, concise and practical, and easy intelligent management. Â