The impact of humidity on partial discharge activity of large rotating machines

Soltani, Reza; David, Éric; Lamarre, L.

doi:10.1109/elinsl.2010.5549721

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…This non-destructive test method allows determination of PD activity in measured subject. [14][15][16] The characteristic parameters according to IEC 60270 standard as inception voltage U i , extinguish voltage U e , apparent charge level Q iec and average discharge current I (in µA ) were measured and analyzed. Furthermore two types of PD diagrams were used to define which types of partial discharges were occurred.…”

Section: Resultsmentioning

confidence: 99%

Influence of Low-Conductive Coating on Insulation System of Rotary Electric Machine

Mráz¹,

Kindl²,

Hruška³

2012

Journal of Electrical Engineering

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Section: Resultsmentioning

confidence: 99%

Influence of Low-Conductive Coating on Insulation System of Rotary Electric Machine

Mráz¹,

Kindl²,

Hruška³

2012

Journal of Electrical Engineering

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“…At the onset of short circuits in rotating machines, the temperatures can increase very quickly [17]- [22] & [27]- [32]. Prior to the catastrophic breakdown of the insulating material, multiple other mechanisms initiate and take place, contributing to the degradation.…”

Section: A Capacitance Frequency Spectramentioning

confidence: 99%

Investigation of traction motor windings' insulation capacitance at switching frequencies under accelerated thermal stress

Panagiotou

Gyftakis

Lophitis

et al. 2017

2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)

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Machines in electric vehicles are driven by switching power electronic devices and undergo variable load cycling. In transient conditions high currents and temperatures develop, forcing the electric motor and particularly the insulation materials to undergo severe multi-stress. Insulation degradation will progressively lead to short-circuits which are harmful for the traction motor, vehicle safety and reliability. This paper focuses on the thermal assessment of insulation's capacitance at switching frequencies. For this, thin-film winding insulation samples were thermally aged at different temperatures and for various periods of time. Dielectric spectroscopy was applied and the capacitance information at different frequencies was extracted. The measurements were substituted to statistical analysis under three factors namely; ageing time, temperature and frequency. It is also evaluated how appropriate it is to use capacitance measurements as a means for reliable prognostic method. The statistical analysis depicts that the capacitance does not follow predictable ageing patterns, mainly because the material's dielectric properties are affected by a number of different degradation mechanisms that occur concurrently.

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The impact of humidity on partial discharge activity of large rotating machines

Cited by 2 publications

References 6 publications

Influence of Low-Conductive Coating on Insulation System of Rotary Electric Machine

Influence of Low-Conductive Coating on Insulation System of Rotary Electric Machine

Investigation of traction motor windings' insulation capacitance at switching frequencies under accelerated thermal stress

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