1、外文资料 Integrated Auto mation of Power Plant Electrical System Abstract: Electrical system for power plant automation level of the relatively backward state, the paper analyzes the electrical system in power plant automation technology in an integrated feasibility, necessity, and several key issues, p
2、roposed the use of field bus technology, new ideas, and gives Specific implementation plans. Keywords: Plant electrical system Fieldbus control wire system Integrated Automation 1 Introduction Integrated automation technology has been applied in power system substations, and decentralized and distri
3、buted technology 1 is widely used in integrated automationsystem.Comparedtothecentralized technology ， this technology has many advantages such as simple and flexible structure, high reliability ,convenient installation and low cost of maintenance. However, integrated automation technology has not b
4、een widely used in power plant electrical system. Protective relay and security devices of electrical system run in a self 9-governed state ， which havent formed an integrated electrical automation system. Therefore The managing and maintaining level hang behind. Latterly more and more power plants,
5、 especially those newly constructed are interested in the automation of power plant electrical system and its relationship with traditional distributed control system (DCS) .This paper analyzes the actuality of power plant electrical system, brings out a new ideal of application ofmicrocomputer9-bas
6、edintegratedautomation technology to power plant electrical system, and gives concrete realization of the program. 2 The status of power plant electrical system The electrical system discussed in this paper is mainly referred to the protection , measurement ,control and automatic devices of secondar
7、y system. Main protection devices include generator protection, main transformer protection and start up/stand by transformer protection. Automatic devices include automatic regulator voltage (AVR),automatic transfer switch(ATS) ,faultkymograp hand protection includes high-voltage motor low-voltage
8、system includes auto-low-voltage intelligent motor protector ,breaker , DC system , etc 2 water system are not included. The characteristics of electrical system 3 operation frequency than thermal microcomputer and large-adopted. mainly on steam9-electrical system.“Hardcable”.exchange is limited on
9、account of the cost .impossible to accomplish more complex electrical data. Aiming at the comparatively laggard level of power plant electrical system automation, this paper analyzes the feasibility, necessity and some key points of the application of integrated automation technology to power plant
10、electrical system. New idea using fieldbus control system technology is presented. This paper also gives the outline and detailed antomatic synchronization system (ASS) . 6 kV auxiliary power integrative protection device, auxiliary transformer integrative protection device, feeder protection device
11、, etc. 400 V changeover device, intelligent. All these belong to the electrical system. The common systems such as coalhandling system, ash handling system and chemical are that electrical equipments have less control objects； lowersystem devices. Electrical devices have high reliability and swift a
12、ction time. The technology level of individual electrical device is high. Presently, 16 or 32 bit single-chip scale programmable logic chip are used to build embedded system. Technologies of AC sampling and digital signal process are also widely DCS is widely used in power plants, and it fulfills ba
13、sic operation and control functions. DCS concerns boiler system meanwhile little on Traditionally, control and signal exchange between DCS and electrical system is through this connection mode needs manycables, and the cost is high. Besides, the information It is electric operation management or ach
14、ieve deep application of Since DCS is the most important system in power Feasibility Analysis of Electrical System Integrated Automation The improvement of electrical system automation is based on integrated automation and field bus or industrial Ethernet technology. Microcomputer9-based protection
15、and automation devices are widely used in power plant electrical system. The measure, logic judge, action, record and man9- machine interface function can be done by software. Moreover, all these devices have communication interface, they can exchange information with master system or with each othe
16、r through field bus. Fieldbus technology has been widely used in industry and electric power field , and it has been paid more and more attention. The technology in communication rate , communication distance and anti jamming capability has been improved. Many sorts of standards have been formed, su
17、ch as Profibus advocated by Siemens, FF by ABB, CAN originated from automobile industry and Lon works brought forward by Echelon company. They are all influential fieldbus technology and applied in industry automation area 4 . Recently, industrial Ethernet network becomes new hotspot. The applicatio
18、n of microcomputer-based devices of electrical system, fieldbus or industrial Ethernet technology and communication capability provided by DCS system bring powerful support for the integrated automation of power plant electrical system. 4 Real inaction of Integrated Automation in Electrical System E
19、lectrical system integrated automation is to connect foregoing many protective relay and automation devices by fieldbus and then connect them to DCS system and (possible) electrical workstation through communication devices. The electrical workstation implements all the electrical application such as monitoring and maintenance function, and the basic Control function is accomplished by DCS system using “hard cable”. With the development of technology, the control function can also be fulfilled by communication. There are two main problems in building integrated
