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Lecture Announcement
These events are organized by various sub-sets of the IEEE Toronto Section.
The contact person listed below is the volunteer who has arranged this event.
Please use the e-mail link provided if you have any questions, suggestions,
or concerns.
| Title
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Dealing with Motor Winding Problems Caused by Inverter Drives
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| Speaker
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Mark Fenger, E-mail: mfenger@irispower.com Tel: 416.620.5600
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| Day and Time
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Thursday, June 26, 2003, 6:30-8:00 PM
(pizza and drink at 6:00)
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| Location
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Auditorium, Building KR,
Ontario Power Generation / Kinectrics,
800 Kipling Avenue, Etobicoke
(Just South of Kipling Subway Station -- Free Parking)
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| Organizer
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The Dielectrics and Electrical Insulation Society Chapter
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| Contact
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Jody Levine, E-mail: jlevine@ieee.org Tel: 416.207.6032
Please confirm your attendance by replying to Jody
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| Abstract
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Failures can occur in random wound stator windings operating in
utility and industrial plants when exposed to the fast rise-time
voltage surges coming from inverters. The failures are due to a
combination of bad luck in specific motor installations (resonance
phenomena caused by power cable length and surge impedance ratios)
together with the fact that modern inverted-fed drives (IFD's)
create tens of thousands of surges per socond with rise-times as
fast as 50ns. Measurements on motors show that these surges create
partial discharges (also called corona) and these discharges may
eventually destroy the turn-to-turn and/or phase-to-phase
insulation, resulting in premature motor failure.
The presentation will discuss the specific mechanisms involved in
the stator winding failure due to IFD's and present the measurements
and analysis from surge monitoring installed on many different
motors. Although some motors may experience short rise-time, high
magnitudes surges, most motors experience either low magnitude
and/or long rise-time surges, which are relatively harmless.
Usually, several different magnitudes and rise-times are present
from the same IFD. Thus, it seems that conventional motor stators
can be safely used in many (but not all) IFD applications. Methods
will be discussed to determine when special IFD duty motors are
needed. Voltage surge tests, as well as partial discharge tests, can
help the user insure that motors can successfully operate in severe
applications.
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| Biography
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Mark Fenger is a Dielectrics Engineer, Iris Power Engineering Inc.
Mark graduated with a Master of Science in Electrical Engineering
from the Technical University of Denmark in 1997. Mark's area of
expertise is aging of solid insulation materials, particularly
partial discharge detection, measurement, and interpretation in
rotating machines. After finishing his thesis, Mark joined Ontario
Hydro Technologies, where he worked as a visiting scientist in the
Electrical Insulation Group for 2½ years. Following this, Mark
joined Iris Power Engineering in May 1999. At Iris Power
Engineering, Mark is involved with testing of rotating machinery and
is a frequent instructor in courses and seminars on insulation
maintenance. He devotes much of his time to research & product
development. He is a member of the IEEE and currently secretary of
IEEE P56 and P522. He is currently the chairperson of the IEEE DEIS
Awards committee. He has written 15 papers so far in his young
career.
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