Keywords: instrument; configuration software; network equipment; optical fiber networking
0 Overview At present, the development and reliability of the power supply and distribution industry play an important role in the development of the national economy. The number of users of key engineering projects, landmark buildings / large public facilities across the country, etc. has increased dramatically. The reliability, safety, real-time, ease of use, compatibility, and narrowing the scope of fault impacts of power supply and distribution systems have raised higher requirements.
Acrel's Acrel-3000 power monitoring system software uses computers, communication equipment, measurement protection devices, etc. to provide a basic platform for real-time data collection, switch status detection and remote control of the system. This power monitoring system can provide Wuhan Heavy Duty Machine Tool Group with a "monitoring integration" overall solution, which mainly includes real-time historical database AcrSpace, industrial automation configuration software AcrControl, power automation software AcrNetPower and so on.
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 heavy-duty and super-heavy machine tools with the largest specifications and the most complete varieties in China. All heavy-duty machine tool products are numerically controlled. Most of the products have reached the international level in the 1990s. Ultra-heavy CNC vertical lathes, ultra-heavy horizontal lathes, ultra-heavy CNC gantry mobile boring and milling machines have reached the modern international advanced level. It is also the only manufacturer in the world that can produce multiple varieties of super heavy machine tool products.
Shanghai Ankerui Electric Co., Ltd. undertakes the design and implementation of the remote automatic meter reading system project of Wuhan Heavy Machine Tool Group. Adopt Acrel-3000 electric power monitoring system. The monitoring scope of this monitoring system: Weitai Liche Company, CNC boring machine company, CNC milling machine company, Wuhan Shanfu Company, Wuzhong Casting and Forging Company, large parts processing plant, small and medium parts processing plant, Power meters in 13 power distribution rooms in 8 units of the office building.
According to the actual requirements of Wuhan Heavy Machine Tool Group and the functions of intelligent components, the system design is completed. The main functions are: a primary wiring diagram interface display; electrical parameter telemetry and electrical parameter over-limit alarm; event recording, system operation abnormal monitoring; fault Alarm and operation records; query and printing of electric energy reports; real-time and historical curves of system load and harmonics, user rights management and other main functions. Actual refinement functions The seller can make feasibility modifications according to the buyer's usage habits and needs.
The entire system adopts a network distributed structure. The monitoring host is located in the 10KV monitoring room. The system uses an open communication protocol and is connected to the communication server MOXA NPort5430 through the field bus. 13 distribution rooms are connected to the low-voltage distribution system through optical fiber networking to achieve Data communication function.
1 System structure
This system adopts a layered distributed computer network structure, that is, the bay layer, communication layer and station control layer as shown below:
The main equipment of the bay layer is: multi-function network power meter, switch, analog acquisition module and intelligent circuit breaker. These devices are installed in the electrical cabinet corresponding to the corresponding primary equipment. These devices all use RS485 communication interface and communicate through the on-site MODBUS bus to achieve on-site data collection.
The middle layer is mainly: the communication server, whose main function is to centrally collect the scattered collection devices, and at the same time remotely transmit to the station control layer to complete the data interaction between the field layer and the station control layer.
Station control layer: equipped with high-performance industrial computers, monitors, UPS power supply, printers, audio and other equipment. The monitoring system is installed on the computer, collects and displays the running status of the field equipment in a centralized manner, and displays it to the user in the form of human-computer interaction.
The above network instruments all adopt RS485 interface and MODBUS-RTU communication protocol, and RS485 adopts shielded wire transmission.
2 Main functions of the system
2.1 Data collection and processing Data collection is the foundation of power distribution monitoring. The data collection is mainly completed by the bottom multi-function network instrument collection to realize the 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, electrical Ep, remote equipment operating status and other data.
Data processing is mainly to display the electrical parameters collected according to the requirements to users in real time and accurately, to achieve the automation and intelligence requirements of power distribution monitoring, and at the same time to store the collected data into the database for user query.
2.2 The human-computer interaction system provides a simple, easy-to-use and good user interface. Adopt full Chinese interface, CAD graphics display the primary wiring diagram of low-voltage distribution system electrical, display the status of distribution system equipment and corresponding real-time operating parameters; real-time dynamic refresh of the screen; analog display; switch display; alarm record display, etc.
2.3 Fault alarm and accident recall When an operation fault occurs in the power distribution system, an audible alarm will be issued promptly to prompt the user to respond to the fault circuit in a timely manner, and at the same time automatically record the time and place of the event to be queried by the user to recall the cause of the fault.
2.4 The establishment and query of the database mainly completes the remote measurement and the regular collection of remote traffic, and establishes a database, and generates reports regularly for users to query and print.
2.5 Electric energy cost management Automatically perform daily, monthly, and annual electrical energy statistics, and can set the peak, peak, flat, and valley time periods, realize the time-sharing function of electrical energy, and generate daily, monthly, and annual reports, current curve graphs, etc. .
2.6 User rights management The number of users who can add and delete software and set user rights according to the buyer's requirements. For different levels of users, set different permission groups to prevent the loss of production and life due to human misoperation, and achieve safe and reliable operation of the distribution system.
2.7 Introduction
2.7.1 ACR330ELH network power meter is installed at the low-voltage inlet end.
The device has functions: three-phase I, U, kW, kVar, kVA, kWh, kVarh, cosφ, Hz measurement; four-quadrant energy metering, complex rate energy accumulation, THDu, THDi, CF (voltage crest factor), THFF ( Telephone waveform factor), current K factor, voltage and current positive / negative zero sequence components, 2-21th harmonic content; 2DI / 2DO, RS485 / Modbus, LCD display.
2.7.2 Low voltage power factor compensation circuit ARC-12 / JC type power factor automatic compensation controller.
The device has functions: it can control the automatic / manual switching of 6 to 12 sets of capacitors, overvoltage protection, undercurrent lockout, 12DI input, Pt100 temperature detection control cabinet temperature and other functions.
2.7.3 ACR220EL network power meter for other circuits.
With functions: three-phase I, U, kW, kVar, kWh, kVarh, Hz, cosφ measurement, RS485 / Modbus. It also has 2DI / 2DO and two 4-20mA output functions.
3 Conclusion In the past, the monitoring systems in each power distribution room were "individuals", and systems of various communication protocols could not achieve data sharing. This is inconsistent with the development of streamlined electrical duty personnel and centralized system monitoring. Wuhan Heavy-duty Machine Tool Group has established a fiber optic network connection between power distribution rooms, concentrated in a monitoring room. Through centralized monitoring of the software of the microcomputer, reading the information amount of the instruments in each power distribution room, the centralized monitoring of the whole plant power system by the monitoring machine is realized. It is possible to understand the status of the power system of the whole plant, which is also very beneficial to the dispatch and command under the power system accident state.
After scientific design, installation and commissioning, the whole system has achieved the expected function. Through the monitoring system to achieve control of various instruments; to achieve data collection, monitoring and management of the distribution room; at the same time with alarm processing and other functions. Friendly interface operating system and simple operation make the system more humanized. Moreover, this system assembles hardware equipment in a self-designed general switch cabinet to achieve centralized management, and at the same time facilitates the maintenance and replacement of the system, improves the modularity, standardization, and layering of products, and facilitates system expansion. The use of configuration software reduces the dependence of power equipment status monitoring on manpower, reduces the cost of manpower, and improves the economic benefits. It provides a scientific and accurate basis for the production operation and management of the power system.
references
[1] Ren Zhicheng, Zhou Zhong, Principles and Application Guide of Electric Power Measurement Digital Instruments, China Electric Power Press, 2007.4
[2] Zhou Zhong The application of Ankerui power monitoring configuration software in power 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., the main research direction is intelligent power monitoring and power management system
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