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Advancements during the past quarter century in on-line monitoring of motor and generator winding insulation

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1 Author(s)

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.

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Dielectrics and Electrical Insulation, IEEE Transactions on  (Volume:9 ,  Issue: 5 )