Open AccessMagnetic core short circuit testing techniques for electrical power generators
Author(s) -
RamírezNiño Jose,
Vega Octavio de la Torre,
Pascacio Alberth,
Mijarez Rito,
Rodríguez–Rodríguez Joaquin H.
Publication year - 2016
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2016.0384
Subject(s) - eddy current , short circuit , core (optical fiber) , isolation (microbiology) , magnetic circuit , finite element method , power (physics) , magnetic core , reliability engineering , electrical engineering , computer science , engineering , electronic engineering , electromagnetic coil , voltage , structural engineering , physics , telecommunications , microbiology and biotechnology , quantum mechanics , biology
Power generators are exposed to high electrical, thermal and mechanical stresses during their operational life. Over time, this could lead to damages in the magnetic core isolation that can cause the formation of large eddy currents and local hot spots that gradually spread. Hence, it is recommended to regularly verify the isolation condition to avoid possible damage, which can lead to an unscheduled outage. This article analyses in detail the short circuit effects of magnetic core laminations of stators in power generators. The existing techniques for quantifying the size of the fault and its location are described. Advantages and disadvantages of these techniques for making maintenance decisions are established. Finally, experimental and finite element modelling results that illustrate the short‐circuit eddy current problem are presented and discussed.