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1、附录附录一 外文资料原文及翻译A1.1 原文Retrospect and Prospect of Excitation Systems of Large Size TurbogeneratorsFrom ELECTRICITY 2002 NO.4By Du xingyouMember of Scientific and Technological都兴有国家电力公司科学技术委员会委员Abstract This paper briefs the developmental course,manufacturing and applications,as well as future prospec
2、t of excitation systems of large size turbogenerators in China,emphatically expounds the advantages of self-excitation systems with potential source rectifiers and matters needing to be noted during dissemination and application of them .Keywords thermal power plant;large size turbogenerator;excitat
3、ionsystem;self-shunt excitationIn the late 1970s,the perfection works of indigenous large size thermal power generating units were started,the main objects of perfection were the original 125 MW,200 MW and 300 MW generating units,the excitation systems of these units,except for a few units which emp
4、loyed direct current (d.c) exciters,were mainly equipped with excites,which included excitation power source(permanent magnet machine,alternating current(a.c.) rotating exciter, rectifier cubicle),slip ring, brush, brush holder, as well as de-excitation switch, de-excitation resistor,automatic volta
5、ge regulator(AVR).At the end of 1980s, the manufacturing technologies of 300 MW and 600 MW generating units of US based Westinghouse Corporation (WH) and Combustion Engineering Corporation (CE) were introdyced to China,the excitation system technology transferred by WH was brushless excitation. By t
6、he end of 1990s, the self-excitation systems with potential source rectifiers(self-shunt excitation) were most employed.1.1 Harbin Electric Machinery Works Ltd.CoAll the original 200 MW generators employed exciters; the imported type 300 MW generators were equipped with exciters in the initial stage
7、s, and could be equipped with self-shunt excitation system later; the imported type 600 MW generators were first equipped with brushless excitation, and can also be equipped with self-shunt excitation system now too. Since these three excitation systems are available, it is very convenient for custo
8、mers to choose any kind excitation system to equip the recently produced 125 (135, 200) MW generators.1.2 Shanghai Electric MachineryWorks Ltd. Co.Both the original double water inner cooling 125 MW (135 MWnow) and 300 MW generators were equipped with exctlers; theimported type 300 MW and 600 MW gen
9、erators were equippedwith brushless excitation originally, and can be equipped with self-shunt excitation system now. Hence three types of excitation systems are available.1.3 Dongfang Electric Machinery Ltd. Co.All the original 200 MW generators were equipped with exciters, the 300 MW generators we
10、re equipped with exciters or self-shunt excitation system; the 600 MW generators with Japanese Hitachi technology introduced employ self-shunt excitation system. The 125 (135) MW generators made recently can be equipped with exciters and self-shunt excitation system.1.4 BeljingTurbogenerator Ltd. Co
11、.The original 200 MW generators also employ exciters; the 330 MW generators jointly produced with France based Alsthom Corp. are equipped with brushless excitation system, the domestication scheme of generators has passed the appraisal and examination, viewing from marketing, serf-shunt excitation c
12、an be provided as well.2.1 Material quality etc. problems of slip ringMaterial quality of slip ring, ventilation, carbon powder, brush holder and its constant pressure spring etc. problems worried about in the past have all been solved. Now all slip rings can be made with outer diameter not exceedin
13、g 400 mm and linear speed not more than 70 m/s; the constant pressure spring needed for brush holder has been solved and can be plugged in and pulled out safely and conveniently during operation; the quality of brushes can satisfy the requirements, but some generators were completed with imported pa
14、rts.2.2 Selection and use of exciters and brushleseexchationsystemAs a result of raising component quality of indigenous rectifiersand improving reliability of a.c. exciters and permanent-magnetmachines, both exciters and brushless excitation system maybasically be selected and used in parallel.2.3
15、De.excitation switchPoor arc suppression performance of breaks and ineffectiveness of mechanism etc. problems existed with the old generation de-excitation switches. While certain debugging experiences were gained at home and manufacturing technologies were imported later, de-excitation switches yet
16、 couldnt be spread and applied throughout the country. Consequently most of 300 MW and 600 MW generators still employ the imported d.c. de-excitation switches when selecting and using self-shunt excitation system.The imported type 300 MW and 600 MW generators employed brushless excitation without de-excitation switches in the early stage.The original de-excitation switches in exciter system of 125 MW and 300 MW double water inner cooling
