Issue 11-12, 2012
ELECTROTECHNICA & ELECTRONICA E+E
Vol. 47. No 11-12/2012
Monthly scientific and technical journal
Published by:
The Union of Electronics, Electrical Engineering and Telecommunications /CEEC/, BULGARIA
C O N T E N T S
ELECTRICAL MACHINES
Vladimir Lazarov
The Department of Electrical Machines in the 21st century 3
Emil Sokolov, Bojidar Milanov
Magnetic field analysis of wound-rotor induction motor 11
Stoyan Batashki
Study of the leakage magnetic field in the end zone of the hydro-generators at Belmeken PSHPP, Sestrimo HPP and Momina Klisura HPP 16
Ivaylo Panayotov
Problems caused by thermal expansion of the stator magnetic core of large hydro generators, methods and means of solving them 24
Dimitar Sotirov, Miho Mihov
Static torque of synchronous reluctance motors with distributed winding 28
Plamen Rizov, Valchan Georgiev Adrian Ivanov
Overview of the systems for On-line partial discharge monitoring for large generators and motors 33
Georgе Todorov, Gantcho Bojilov
Magnetizing current monitoring and analysis for detecting turn-to-turn short circuit in transformer 41
Emil Ratchev, Radka Krasteva, Kristo Kristov
Vibration based rotor speed estimation in diagnostics of a high speed sensorless induction motor drive 47
ALTERNATIVE ENERGY SOURCES
Vladimir Lazarov
Theoretical and practical problems of the modeling of wind-power generators 53
Vladimir Lazarov, Zahari Zarkov, Ludmil Stoyanov, Hristiyan Kanchev
Strategies for output power control of photovoltaic systems 62
