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DTSTART:20150308T030000
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DTSTART:20151101T010000
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DTSTAMP:20150914T194905Z
UID:F1CDEDCC-E5B6-11E7-833E-0050568D7F66
DTSTART;TZID=US/Eastern:20150513T160000
DTEND;TZID=US/Eastern:20150513T190000
DESCRIPTION:Today’s variable speed drive motor supplies are very simple i
 n design and stem from advances that have been made in power electronic sw
 itches. They typically consist of a pulse width voltage source inverter to
  control frequency thereby controlling synchronous motor speed. This techn
 ique is widely used with pulses having 150 to 200 ns rise times and pulse 
 repetition frequency of 1 to 10 kHz. Although the use of variable speed dr
 ives for motors has far greater benefits than the earlier techniques of co
 ntrolling speed\, from the onset of using these drives\, various types of 
 premature insulation failures have been reported. Generally\, repetitive f
 ast pulses enhance electrical stress on the insulation system that manifes
 ts itself by early degradation\, which is caused by partial discharge and 
 corona. However\, for form-wound coils and Roebel bars that are used in me
 dium and high voltage motors\, the main challenge has been in addressing t
 he adverse effects on the motor coil insulation system\, including strand\
 , turn\, and groundwall insulation as well as the conductive armor and str
 ess grading coatings that are applied for relief of electric stress. Altho
 ugh these coatings work well as an “anti-corona” or “stress relief
 ” under power frequency\, they exhibit poor performance under repetitive
  steep front pulses. In addition\, dielectric loss in the insulation\, par
 ticularly in the conductive armor and in the stress grading coatings becom
 e a problem at the higher frequencies.\n\nThe presentation will address th
 e above issues along with research results along with possible solutions.\
 n\nCo-sponsored by: Ali Naderian\n\nSpeaker(s): Ed Cherney\, \n\nToronto\,
  Ontario\, Canada
LOCATION:Toronto\, Ontario\, Canada
ORGANIZER:ali.naderian@ieee.org
SEQUENCE:0
SUMMARY:[Legacy Report] Variable Speed Drive Motor Insulation Challenges
URL;VALUE=URI:https://events.vtools.ieee.org/m/120625
X-ALT-DESC:Description: <br /><p>Today&rsquo\;s variable speed drive motor 
 supplies are very simple in design and stem from advances that have been m
 ade in power electronic switches. They typically consist of a pulse width 
 voltage source inverter to control frequency thereby controlling synchrono
 us motor speed. This technique is widely used with pulses having 150 to 20
 0 ns rise times and pulse repetition frequency of 1 to 10 kHz. Although th
 e use of variable speed drives for motors has far greater benefits than th
 e earlier techniques of controlling speed\, from the onset of using these 
 drives\, various types of premature insulation failures have been reported
 . Generally\, repetitive fast pulses enhance electrical stress on the insu
 lation system that manifests itself by early degradation\, which is caused
  by partial discharge and corona. However\, for form-wound coils and Roebe
 l bars that are used in medium and high voltage motors\, the main challeng
 e has been in addressing the adverse effects on the motor coil insulation 
 system\, including strand\, turn\, and groundwall insulation as well as th
 e conductive armor and stress grading coatings that are applied for relief
  of electric stress. Although these coatings work well as an &ldquo\;anti-
 corona&rdquo\; or &ldquo\;stress relief&rdquo\; under power frequency\, th
 ey exhibit poor performance under repetitive steep front pulses. In additi
 on\, dielectric loss in the insulation\, particularly in the conductive ar
 mor and in the stress grading coatings become a problem at the higher freq
 uencies.</p>\n<p>The presentation will address the above issues along with
  research results along with possible solutions.</p>\n<p>&nbsp\;</p>
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