Title :
Partial discharge testing on air-cooled generators in marine environments
Author_Institution :
Iris Power-Qualitrol, Mississauga, ON, Canada
Abstract :
Partial discharge activity has long been known to be an indicator of the presence of some deterioration mechanisms at work within, or on, the solid insulation of the stator windings of high voltage rotating machines. Partial discharges (sometimes also known as corona) are known to occur in deteriorated stator winding insulation systems, as well as new systems with manufacturing or installation flaws or shortcomings. Advances in on-line detection and measurement of partial discharges has resulted in monitoring equipment that provides a knowledgeable user with reliable and repeatable information regarding the behavior of an insulation system while a machine is in operation. Power plant generators on marine vessels present a unique challenge in monitoring due to the presence of system harmonics from the POD motors. Though off-line PD has often been used for marine vessels, it fails to detect problems related to mechanical, thermal, ambient and even normal electrical stresses. This paper will highlight some of the benefits of on-line PD testing using these results with case studies and signal analysis from marine vessel applications.
Keywords :
cooling; electric machines; machine insulation; marine power systems; marine vehicles; partial discharge measurement; stators; POD motor; air-cooled generator; ambient stress; deterioration mechanism; electrical stress; high voltage rotating machine; installation flaw; manufacturing flaw; marine vessel; mechanical stress; monitoring equipment; online PD testing; online detection; partial discharge activity; partial discharge measurement; partial discharge testing; power plant generator; signal analysis; solid insulation; stator winding insulation system; system harmonics; thermal stress; Generators; Harmonic analysis; Humidity; Insulation; Noise; Power harmonic filters; Stator windings; Ambient humidity; Harmonics; Marine generators; Marine power plants; Partial discharge;
Conference_Titel :
Electrical Insulation Conference (EIC), 2013 IEEE
Conference_Location :
Ottawa, ON
Print_ISBN :
978-1-4673-4738-9
Electronic_ISBN :
978-1-4673-4739-6
DOI :
10.1109/EIC.2013.6554259