document: Advancements during the past quarter century in on-line monitoring of motor and generator winding insulation Electrical insulation plays a critical role in the operation of motor and generator rotor and stator windings . Premature failure of the insulation can cost millions of dollars per day . With advancements in electronics , sensors , computers and software , tremendous progress has been made in the past 25 yr which has transformed on-line insulation monitoring from a rarely used and expensive tool , to the point where 50 % of large utility generators in North America are now equipped for such monitoring . This review paper outlines the motivation for online monitoring , discusses the transition to today 's technology , and describes the variety of methods now in use for rotor winding and stator winding monitoring
doc_bio_tags: O O O O O O O O O O O O B I I B I O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O B O B O B O B O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O
extractive_keyphrases: generator winding insulation electrical insulation electronics sensors computers software stator windings
abstractive_keyphrases: motor generator winding insulation winding insulation on-line monitoring premature insulation failure rotor windings temperature monitoring condition monitors tagging compounds ozone monitoring pd monitoring magnetic flux monitoring partial discharge monitoring endwinding vibration monitoring