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Monitoring off-line and on-line PD under impulsive voltage on induction motors - Part 3: Criticality.

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Title: Monitoring off-line and on-line PD under impulsive voltage on induction motors - Part 3: Criticality.
Authors: Tozzi, M.1, Cavallini, A.2, Montanari, G.2
Source: IEEE Electrical Insulation Magazine. Jul2011, Vol. 27 Issue 4, p26-33. 0p.
Subjects: Induction motors, Electric insulators & insulation, Electric inverters, Electromagnetic induction, Electric windings, Electric generators
Abstract: Premature failures of random-wound induction motors, fed by adjustable-speed drives, have frequently occurred over the last two decades. Overvoltages at the motor terminals causing abnormal electrical stresses on the windings have been singled out as the most critical factor affecting winding insulation reliability [1]-[7]. These overvoltages are due to wave reflections associated with the mismatch between the impedance of the motor and that of the cable connecting the machine to the adjustable-speed drive. When the overvoltages are high enough to initiate partial discharges (PDs) within the winding, degradation of the wire enamel insulation progresses very rapidly, causing failure. To help circumvent premature failures, the International Electrotechnical Commission (IEC), in 2007, released a technical specification (TS) [8], currently under revision, supporting a quality-control procedure to check that new windings are free of PD when subjected to converter surges. The procedures consisting of both impulsive and sinusoidal offline tests are outlined in this article. [ABSTRACT FROM PUBLISHER]
Copyright of IEEE Electrical Insulation Magazine is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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PubType: Academic Journal
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  Data: Monitoring off-line and on-line PD under impulsive voltage on induction motors - Part 3: Criticality.
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  Data: <searchLink fieldCode="AR" term="%22Tozzi%2C+M%2E%22">Tozzi, M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Cavallini%2C+A%2E%22">Cavallini, A.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Montanari%2C+G%2E%22">Montanari, G.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22IEEE+Electrical+Insulation+Magazine%22">IEEE Electrical Insulation Magazine</searchLink>. Jul2011, Vol. 27 Issue 4, p26-33. 0p.
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  Data: <searchLink fieldCode="DE" term="%22Induction+motors%22">Induction motors</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+insulators+%26+insulation%22">Electric insulators & insulation</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+inverters%22">Electric inverters</searchLink><br /><searchLink fieldCode="DE" term="%22Electromagnetic+induction%22">Electromagnetic induction</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+windings%22">Electric windings</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+generators%22">Electric generators</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Premature failures of random-wound induction motors, fed by adjustable-speed drives, have frequently occurred over the last two decades. Overvoltages at the motor terminals causing abnormal electrical stresses on the windings have been singled out as the most critical factor affecting winding insulation reliability [1]-[7]. These overvoltages are due to wave reflections associated with the mismatch between the impedance of the motor and that of the cable connecting the machine to the adjustable-speed drive. When the overvoltages are high enough to initiate partial discharges (PDs) within the winding, degradation of the wire enamel insulation progresses very rapidly, causing failure. To help circumvent premature failures, the International Electrotechnical Commission (IEC), in 2007, released a technical specification (TS) [8], currently under revision, supporting a quality-control procedure to check that new windings are free of PD when subjected to converter surges. The procedures consisting of both impulsive and sinusoidal offline tests are outlined in this article. [ABSTRACT FROM PUBLISHER]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of IEEE Electrical Insulation Magazine is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1109/MEI.2011.5954066
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        Text: English
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      – SubjectFull: Induction motors
        Type: general
      – SubjectFull: Electric insulators & insulation
        Type: general
      – SubjectFull: Electric inverters
        Type: general
      – SubjectFull: Electromagnetic induction
        Type: general
      – SubjectFull: Electric windings
        Type: general
      – SubjectFull: Electric generators
        Type: general
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      – TitleFull: Monitoring off-line and on-line PD under impulsive voltage on induction motors - Part 3: Criticality.
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              Text: Jul2011
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