DocumentCode :
1870636
Title :
Requirements for insulation system of motors fed by modern voltage source converters
Author :
Peroutka, Zdenêk
Author_Institution :
West Bohmia Univ., Plzen, Czech Republic
Volume :
6
fYear :
2004
fDate :
20-25 June 2004
Firstpage :
4383
Abstract :
Insulation system of motors fed by modern voltage source converters (VSC) is subjected to higher dielectric stress. High voltage gradients and transient overvoltages that occur in each converter switching point dramatically decrease motor lifetime. This paper investigates motor overvoltages, their impact on motor insulation and also explores relationship between converter control strategy (converter output voltage pattern) and occurring surges. Obtained results are compared with existing standards (NEMA MG1-1998 (Rev. 3: 2002) and IEC/TS 60034-17 (3rd Edition)) in order to review capability of employed motor insulations. Moreover, the paper discusses breakdown locations within the stator winding insulation and describes principles of these failures. The aim of this paper is to present general theory of motor transient overvoltages, because general theory of these effects is still missing in the literature, and to provide useful approach enabling evaluation of the reliability of the drive in practice. A lot of experiments have been performed on industrial and especially traction drives. Presented results and theories are confirmed by tests performed on the main drive of light rail vehicle recently developed in Skoda Electric Company.
Keywords :
light rail systems; machine insulation; overvoltage; stators; switching convertors; traction motor drives; converter control strategy; converter switching; dielectric stress; modern voltage source converter; motor fed insulation system; motor transient overvoltage; stator winding insulation; traction drives; Dielectrics and electrical insulation; Electric breakdown; IEC standards; Power conversion; Stator windings; Stress; Surges; Switching converters; Traction motors; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics Specialists Conference, 2004. PESC 04. 2004 IEEE 35th Annual
ISSN :
0275-9306
Print_ISBN :
0-7803-8399-0
Type :
conf
DOI :
10.1109/PESC.2004.1354775
Filename :
1354775
Link To Document :
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