Abstract: In order to improve the reliability of the power monitoring system, an optical fiber networking method was proposed for the power monitoring system of Wuhan Heavy Machine Tool Group: the instrument, configuration software and network equipment were connected. The system assembles the hardware circuit in the switchgear cabinet, develops and designs monitoring software through the configuration software, displays the system configuration and various electrical parameters, and realizes the data acquisition, monitoring and management of the power distribution room. The entire system has a high degree of integration and can meet the requirements of decentralized, networked, and intelligent power monitoring systems in Wuhan Heavy Machinery Plant.
Keywords: instrumentation; configuration software; network equipment; fiber optic network
0 Overview At present, the development and reliability of the power supply and distribution industry play a decisive role in the development of the national economy. The number of large-scale multi-substation users, such as key construction projects and landmark buildings/large-scale public facilities throughout the country, has increased dramatically. The reliability, safety, real-time, ease of use, and compatibility of the power distribution system and the narrowing of the scope of faults raise higher requirements.
Acrel's Acrel-3000 power monitoring system software uses computers, communications equipment, and metering protection devices to provide a basic platform for real-time data acquisition, switch status detection, and remote control of the system. The power monitoring system can provide integrated monitoring solutions for Wuhan Heavy Machine Tool Group, including AcrSpace, AcrControl, and AcrNetPower.
Wuhan Heavy-duty Machine Tool Group Co., Ltd. (formerly Wuhan Heavy-duty Machine Tool Plant, referred to as Wuzhong) is a large-scale backbone enterprise that produces the largest and most complete variety of heavy-duty and super-heavy machine tools in China. Heavy-duty machine tool products all realize numerical control. Most products have reached the international level of the 1990s, super heavy-duty CNC vertical lathes, super-heavy horizontal lathes, ultra-heavy CNC Gantry mobile boring and milling machines to reach the international advanced level. It is also the only manufacturer in the world that can produce a variety of super-heavy duty machine tools.
Ankerui Electric Co., Ltd. undertakes the design and implementation of the remote automatic meter reading system project of Wuhan Heavy Machine Tool Group. Acrel-3000 power monitoring system is adopted. The monitoring range of this monitoring system is: Weitai Liquor Co., Ltd., CNC boring machine company, CNC milling machine company, Wuhan Shanfu Company, Wuzhong Casting and Forging Company, large-scale processing factory, small and medium-sized processing factory, Office building 8 units 13 power meters in the distribution room.
In accordance with the actual needs of Wuhan Heavy Machine Tool Group and the functions of intelligent components, the design of the system is completed. The main functions are: display of a main wiring diagram interface; remote parameter measurement of electric parameters and over-limit alarm of electric parameters; event recording, abnormal monitoring of system operation; Alarm and operation records; power report query and printing; system load, real-time harmonics, historical curves, user rights management and other main functions, the actual refinement function sellers can make feasibility changes according to the buyer's habits and needs.
The entire system adopts a network distributed structure. The monitoring host is located in the 10KV monitoring room. The system adopts an open communication protocol and is connected to the communication server MOXA NPort 5430.13 power distribution rooms through the field bus. It is connected to the low-voltage distribution system through optical fiber networking to achieve Data communication function.
1 The structure of the system
The system adopts a layered distributed computer network structure, namely, a bay layer, a communication layer, and a station control layer as shown in the following figure:
The main equipments in the bay are: multi-functional network power meters, switches, analog acquisition modules and intelligent circuit breakers. 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 middle tier is mainly a communication server. Its main function is to collect the scattered data at the site collection device and transmit it to the station control layer at the same time. The data exchange between the field layer and the station control layer is completed.
Station control layer: equipped with high-performance industrial computers, monitors, UPS power supplies, printers, audio 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 use RS485 interface and MODBUS-RTU communication protocol, and RS485 adopts shielded wire transmission.
2 The main function of the system
2.1 Data Acquisition and Processing Data acquisition is the basis of power distribution monitoring. Data acquisition is mainly completed by the underlying multi-function network instrumentation 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.
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 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 is dynamically refreshed in real time; the analog display; the switch display; and the alarm log display.
2.3 Fault alarm and accident recall In the event of an operational fault in the power distribution system, an alarm will be sounded in a timely manner to prompt the user to respond to the fault circuit in a timely manner. At the same time, the time and place of the incident will be recorded automatically to be queried by the user and the cause of the fault will be recalled.
2.4 The establishment and inquiry of the database mainly completes the remote measurement and remote information acquisition, and establishes a database to generate reports regularly for users to query and print.
2.5 Electric Energy Cost Management Automatically conducts daily, monthly, and annual energy statistics, and can be set for peak, peak, level, and valley time periods to realize the function of time-divisional billing for electric energy, and to generate daily, monthly, annual reports, current curves, etc. .
2.6 User Rights Management The number of users who can add and delete software and the user's rights can be set according to the buyer's requirements. 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.
2.7 Instrument Introduction
2.7.1 ACR330ELH network power meter is installed on the low-voltage line end.
The device has functions: three-phase I, U, kW, kVar, kVA, kWh, kVarh, cosφ, Hz measurement; four-quadrant energy metering, multi-rate energy accumulation, THDu, THDi, CF (voltage crest factor), THEF ( Telephone waveform factor), current K coefficient, positive/negative zero-sequence component of voltage and current, 2-21 times of each harmonic content; 2DI/2DO, RS485/Modbus, LCD display.
2.7.2 Low-voltage power factor compensation loop ARC-12/JC power factor automatic compensation controller.
The device has the following functions: It can control the automatic/manual switching of 6 to 12 capacitors, overvoltage protection, undercurrent lock, 12DI input, Pt100 temperature detection control cabinet temperature and other functions.
2.7.3 Other Circuits ACR220EL Network Power Meter.
Functions: Three-phase I, U, kW, kVar, kWh, kVarh, Hz, cosφ measurement, RS485/Modbus. Also has 2DI/2DO, two 4-20mA output functions.
3 Concluding remarks In the past, the monitoring systems in all power distribution rooms were "independent," and systems of various communication protocols could not achieve data sharing. This is inconsistent with the development of rigorous and systematic centralized monitoring of electric watch personnel. Wuhan Heavy Machine Tool Group established a fiber-optic network connection between power distribution rooms and focused on a monitoring room. Through the centralized monitoring of the software of the microcomputer, the amount of information of the meters in each distribution room is read, and the centralized monitoring of the whole plant power system by the monitoring machine is realized. Can understand the status of the entire plant power system, which is also useful for dispatching commands under power system accident conditions.
After scientific design, installation and commissioning, the entire system has achieved the expected functions. Through the monitoring system to achieve control of various instruments; to achieve the power distribution room data acquisition, monitoring and management; at the same time with alarm processing and other functions. Friendly interface operating system and easy operation make the system more user-friendly. Moreover, the system assembles the hardware equipment in a general-purpose switch cabinet designed by itself to achieve centralized management, and also facilitates the maintenance and replacement of the system, and improves the modularity, standardization, and hiberarchy of the product, facilitating the expansion of the system. The use of configuration software reduces the dependence of power equipment status monitoring on manpower, reduces manpower costs, and improves economic efficiency. Provides scientific and accurate basis for the production operation and management of the power system.
references
[1] Ren Chengcheng and Zhou Zhong eds. Principle and Application Guide for Power Electronic Measurement Digital Instrument China Electric Power Press, 2004.4
[2] Zhou Zhong An Kerui Power Monitoring Configuration Software Application in Distribution System
[3] Feng Guohua monitoring configuration software and its application [M]. Beijing: Tsinghua University Press, 2001.
[4] Development Status of Wu Aiguo Industrial Ethernet[J].Information and Control,2003,32(5):458-461.
About the Author:
Yu Jing, female, undergraduate, engineer of Wuhan Ankerui Electric Co., Ltd., major research direction is intelligent power monitoring and power management system, technical exchange QQ E-mail:
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