2010
DOI: 10.1109/tdei.2010.5595549
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Impact of humidity on dielectric response of rotating machines insulation system

Abstract: The study of dielectric response is a significant method to characterize the electrical properties of insulating materials and a useful tool for condition assessment of the insulation systems of rotating machines. Time and frequency domain measurements can be used to determine the dielectric response. Polarization and depolarization current measurements are usually used as a time domain measurement while in frequency domain the capacitance and dissipation factor of the samples can be measured over a broad rang… Show more

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Cited by 23 publications
(11 citation statements)
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“…Since both charge and discharge currents are affected, this suggests moisture absorption into the bulk of the insulation system in addition to the moisture absorbed along the end windings. This assumption was confirmed when guarded measurements were conducted on the same coil [19]. Figure 4a shows the charge and discharge currents for an earlier epoxy-mica bar which has relatively low values of normalized resistances as compared with modern epoxymica insulation system.…”
Section: Moisture Absorption and Contaminationmentioning
confidence: 62%
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“…Since both charge and discharge currents are affected, this suggests moisture absorption into the bulk of the insulation system in addition to the moisture absorbed along the end windings. This assumption was confirmed when guarded measurements were conducted on the same coil [19]. Figure 4a shows the charge and discharge currents for an earlier epoxy-mica bar which has relatively low values of normalized resistances as compared with modern epoxymica insulation system.…”
Section: Moisture Absorption and Contaminationmentioning
confidence: 62%
“…For this bar, the exposure to humidity affected both the charge and the discharge currents. However, it did not lead to any significant change when guarded measurements were conducted indicating that the moisture absorption occurred only along the end winding portions of the bar [19]. For this bar, the stress grading system was an exposed ferrous oxide type paint, which normally has a low conductivity and does not lead to an interfacial polarization effect within the frame of observation [11].…”
Section: Moisture Absorption and Contaminationmentioning
confidence: 99%
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“…The results of the electrical machine tests including online and offline may follow different behaviors in a same machine [11]. The results of these methods' measurement depend on different factors such as humidity [12], air pressure [13,14], mechanical pressure [15], type of fault [16], temperature [17], raw natural gas [18], power electronic arrangements [19], insulation class [20], high and low frequency pulses [21,22], corona discharges [23], and etc. Now the question is that why should a machine have different results in spite of similar tests while all tests are done through similar devices and procedures?…”
Section: Introductionmentioning
confidence: 99%