Haimen Administration Center Power Monitoring System System Design
Ni Zhongming Fig.1 Topological structure diagram of power distribution system Figure 2 Distribution System Diagram of Low-voltage Distribution System in Building B Figure 3 Communication State Diagram of Power Monitoring System Figure 4 remote meter reading Figure 5 Event record
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(Shanghai Ankerui Electric Co., Ltd., Jiading 201801, Shanghai, China)
Keywords: government agencies; smart meter; power monitoring software
0 Preface
Haimen is located in the famous Yangtze River Delta. Jianxian County was established in 958 (later Zhou Xiande 5 years). It was named after the gateway to the sea and is known as the “hometown of cotton grain, riverside paradiseâ€.
The Haimen administrative center power monitoring and power management project is a project that began in July 2009. It aims to achieve centralized management and detection of the power systems of administrative buildings A, B, H and main buildings through the system, and achieve remote intelligent power distribution. system. The project achieved intelligent management of the power system in the 4 buildings of the Haimen Administration Center. The design plan is 4 power distribution rooms in 4 buildings. The power distribution center of the first basement of the main building is pulled down through the optical fiber through the photoelectric converter. 4 distribution cabinets are equipped with communication cabinets at the site. The meter data is transmitted through the MOXA serial port server through the 485 line, and the photoelectric converter is delivered to the distribution center.
1 system structure
Acrel-3000 power monitoring software is special software for on-site production data collection and process control. The most important feature is that it can be integrated in a flexible and diverse "configuration mode" rather than a programming mode. It provides a good user development interface. With simple and simple engineering implementation methods, as long as its pre-configured various software modules are simply “configuredâ€, it is very easy to implement and complete the various functions of the monitoring layer. For example, in a distributed network application, all applications (for example, trend curves, alarms, etc.) have the same reference method for remote data as the reference to local data. By means of “configurationâ€, the system integration time of automation engineers is greatly shortened, and the Integration efficiency. The topology structure of the distribution and distribution system at Haimen Administrative Center is shown in Figure 1. 
1.1 Field device layer
The main task of the field device layer is to collect and measure the operating parameters of various distribution systems at the site, and transmit the collected and measured data to the monitoring system through the network communication layer. The main equipment of the main building's power distribution room is: ACR220EL/KC, ACR330EL/KC programmable intelligent power meter total 96; A floor of the main equipment is: ACR220EL/KC programmable smart meter total 63; The main equipment of the B-transformation and distribution room is: ACR220EL/KC programmable smart meter totalling 59 pieces; the main equipment of the H-building power distribution room is: ACR220EL/KC programmable smart meter total 105 pieces. The above devices are all independent of each other to complete their own functions, do not rely on the main control computer to run, with RS-485 communication interface, through the site of the RS-485 bus will be detected in the various electrical parameters and status signals transmitted to the middle layer of real-time data processing Unit - Serial Server.
ACR series of programmable smart meter, this series of instruments using AC sampling technology, can measure the current, voltage, power, power factor and power parameters in the grid, can set the magnification through the membrane switch. With RS-485 communication interface, using Modbus protocol; can also convert the power signal into a standard DC analog signal output; or with a digital input / output, relay alarm output and other functions.
1.2 Network Communication Layer
The network communication layer is located between the field layer and the master control layer, using a high-performance, embedded communication server. The communication server is responsible for the data collected at the field level through the network communication connection and data exchange to the master control layer, which is the bridge between the master control layer and the field layer.
1.3 Station Control Management
The main control floor is located in the basement of the main building and is equipped with high-performance, high-reliability industrial-grade computers, UPS uninterruptible power supplies, and printers. Acrel-3000 power monitoring software is installed on the main control computer, realizing the real-time monitoring and report management of the entire administrative center through the man-machine interface and various management functions of the software.
The duty room of the Haimen Administration Center is located on the ground floor of the main building and is equipped with an industrial network switch. The A-floor power distribution room uses 8 buses at the site. It uses an 8-port serial server and is connected to the main building via optical fiber. The indoor switchboards; the B-transformation and power distribution room uses 6 buses in the field, uses an 8-port serial server, and connects to the switchboard in the main building on-duty through the optical fiber; the H-transformation room uses 5 buses in the field and uses An 8-port serial server is connected to the switches in the main building interior through optical fibers; the data is then transmitted to the IPC through the switch.
2 The main functions of the power monitoring system
The system is designed according to the customer's actual needs and realizes a main wiring diagram interface display; electric parameter telemetering and electric parameter crossing limit alarm; event record; system operation abnormality monitoring; fault alarm and operation record; report query and printing; system load real-time , history curve, user rights management and other main functions.
2.1 Data Acquisition and Processing
Data acquisition is the basis of power distribution monitoring. Data collection is mainly completed by the underlying multi-function network instrument to achieve 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 Ep, and remote device operating status.
Data processing is mainly to display 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. At the same time, the collected data is stored in the database for user query.
2.2 Human-computer interaction
The system provides 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 distribution system, shows the status of the distribution system equipment and the corresponding real-time operating parameters; the screen is dynamically refreshed in real time; the analog quantity display, etc.
2.3 Failure alarm and accident recall
When an operational failure occurs in the power distribution system, an audible and visual alarm will be promptly issued to prompt the user to respond to the fault circuit in a timely manner. At the same time, the time when the event occurs is automatically recorded to be queried by the user and the cause of the failure is recalled.
2.4 Database Establishment and Query
It mainly completes remote measurement and remote signal acquisition, and establishes a database to generate reports regularly for users to query and print.
2.5 Running load curve
Timely acquisition of incoming line and important loop current load parameters, automatic generation of the operating load trend curve, to facilitate users to understand the equipment operating load status.
2.6 Energy Cost Management
Automatically perform daily, monthly, and annual energy statistics, and generate daily, monthly, and annual reports.
3 Case Studies
There are 10 10/0.4 kV distribution transformers in the low-voltage power distribution system of Haimen Administration Center. This system is mainly responsible for the real-time dynamic monitoring of low-voltage incoming lines and corresponding outgoing circuits.
The incoming circuit uses ACR330EL/KC, which can measure three-phase voltage, three-phase current, active power, reactive power, power factor, frequency, active energy, reactive energy and other electrical parameters, and with 4 optical isolation Switch input contact and 2 relay control output contacts with RS485 communication interface.
Distribution circuit using ACR220EL/KC, it can measure three-phase current, with 4 optoelectronic isolation switch input contacts and 2 relay control output contacts, with RS485 communication interface.
The low voltage distribution system mainly monitors the electrical parameters of the operating equipment, including the three-phase current, power, power, energy, frequency and other electrical parameters of the incoming line and the three-phase currents of the outgoing loop, as shown in Figure 2. 
According to the actual situation in the field, the total cost of the system hardware including the collection device, power supply, workstation host, printing equipment, system software, and weak installation and installation is 190,000 yuan. The data of each link of power distribution can be displayed centrally through the monitoring host, which facilitates the distribution manager to discover the faults of the power distribution in a timely manner. The power data can be collected monthly and can also be forwarded to the BAS of the building automation system to facilitate overall scheduling. Compared with traditional electricians, meter reading and statistics increase investment once, but the degree of intelligence has been greatly improved, saving human capital investment. It eliminates the cumbersome of on-site meter reading by on-duty personnel, and has the advantages of less investment, concise and practical, and easy intelligent management.
5 Concluding remarks
Acrel-3000 power monitoring system has the advantages of good versatility, high reliability, and flexible configuration. It has been successfully applied to the Haimen administrative center project. With the popularization of computer information technology, the requirements for the intelligentization of low-voltage distribution are getting higher and higher. The change-distribution monitoring and low-voltage distribution management make the unattended operation of the power distribution room become a reality, and the system is applicable to all kinds of electrical equipment. The historical operating data and status are managed and analyzed to make it easy for maintenance personnel to clarify equipment conditions, develop detailed equipment maintenance plans, reduce manpower investment, and improve work efficiency, thereby reducing the operating costs of the entire system.
references:
[1] "Principles and Application Guide for Power Electronic Measurement Digital Meters", Ren Chengcheng, Zhou Zhong, China Electric Power Press
About the Author:
Ni Zhongming (1982-), male, undergraduate, graduated from the School of Automation, Qingdao University of Science and Technology, engaged in the work of transformer and distribution monitoring systems.
Shanghai Ankerui Electric Co., Ltd. System Integration Department Email: