Details
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 2004 IEEE International Conference on Solid Dielectrics ICSD 2004 |
| Pages | 665-668 |
| Number of pages | 4 |
| Volume | 2 |
| Publication status | Published - 2004 |
| Event | 2004 IEEE International Conference on Solid Dielectrics ICSD 2004 - Toulouse, France Duration: 5 Jul 2004 → 9 Jul 2004 |
Abstract
The insulation system of power transformers consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and aging. Their condition can therefore, be evaluated using dielectric response measurements. This contribution describes the Return Voltage Measurement (RVM) diagnostic method based on scanning the polarization spectra of the oil-paper insulation in the time range of Is to 1200s at an excitation voltage of 500V (DC). The variation of the dissipation factor (tan 5) and power factor (cos θ) in the frequency range of 0.0001 to 1000 Hz were measured and the effects of moisture and aging were analyzed. Furthermore accelerated aging processes of oil-paper samples were investigated under air environment up to a temperature of 388 K (115°C). Typical transformer proportions of copper, aluminum, zinc and iron were added to oil-paper insulation during the aging process in order to simulate the possible oxidation processes. For the investigation of the long time behavior, the oil-paper insulation samples were aged at different aging times at 250, 500, 1000 and 2000 hours which simulate long time service condition due to the used severe aging conditions.
ASJC Scopus subject areas
- Engineering(all)
- General Engineering
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Proceedings of the 2004 IEEE International Conference on Solid Dielectrics ICSD 2004. Vol. 2 2004. p. 665-668.
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Detection of oil-pressboard insulation aging with dielectric spectroscopy in time and frequency domain measurements
AU - Hassan, O.
AU - Shayegani Akmal, Amir Abbas
AU - Borsi, H.
AU - Gockenbach, Ernst
AU - Abu-Elzahab, E. M.
AU - Gilany, Mahmoud I.
PY - 2004
Y1 - 2004
N2 - The insulation system of power transformers consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and aging. Their condition can therefore, be evaluated using dielectric response measurements. This contribution describes the Return Voltage Measurement (RVM) diagnostic method based on scanning the polarization spectra of the oil-paper insulation in the time range of Is to 1200s at an excitation voltage of 500V (DC). The variation of the dissipation factor (tan 5) and power factor (cos θ) in the frequency range of 0.0001 to 1000 Hz were measured and the effects of moisture and aging were analyzed. Furthermore accelerated aging processes of oil-paper samples were investigated under air environment up to a temperature of 388 K (115°C). Typical transformer proportions of copper, aluminum, zinc and iron were added to oil-paper insulation during the aging process in order to simulate the possible oxidation processes. For the investigation of the long time behavior, the oil-paper insulation samples were aged at different aging times at 250, 500, 1000 and 2000 hours which simulate long time service condition due to the used severe aging conditions.
AB - The insulation system of power transformers consists of oil and cellulose, whose dielectric properties are strongly influenced by moisture, temperature and aging. Their condition can therefore, be evaluated using dielectric response measurements. This contribution describes the Return Voltage Measurement (RVM) diagnostic method based on scanning the polarization spectra of the oil-paper insulation in the time range of Is to 1200s at an excitation voltage of 500V (DC). The variation of the dissipation factor (tan 5) and power factor (cos θ) in the frequency range of 0.0001 to 1000 Hz were measured and the effects of moisture and aging were analyzed. Furthermore accelerated aging processes of oil-paper samples were investigated under air environment up to a temperature of 388 K (115°C). Typical transformer proportions of copper, aluminum, zinc and iron were added to oil-paper insulation during the aging process in order to simulate the possible oxidation processes. For the investigation of the long time behavior, the oil-paper insulation samples were aged at different aging times at 250, 500, 1000 and 2000 hours which simulate long time service condition due to the used severe aging conditions.
UR - http://www.scopus.com/inward/record.url?scp=10044293892&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:10044293892
SN - 0780383486
VL - 2
SP - 665
EP - 668
BT - Proceedings of the 2004 IEEE International Conference on Solid Dielectrics ICSD 2004
T2 - 2004 IEEE International Conference on Solid Dielectrics ICSD 2004
Y2 - 5 July 2004 through 9 July 2004
ER -