Particularities of air insulation behavior

Particularities of air insulation behavior

In actual practice the withstand voltage level of air insulation is estimated by an extrapolation based on the 50% breakdown voltage, U 50% , and the standard deviation, σ both obtained by laboratory tests. For this extrapolation to be possible it is assumed that the breakdown probability follows a...

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Veröffentlicht in:IEEE transactions on power apparatus and systems 1976-11, Vol.95 (6), p.1814-1821
Hauptverfasser: Menemenlis, C., Harbec, G.
Format: Artikel
Sprache:eng
Schlagworte:
Breakdown voltage
Electric breakdown
Extrapolation
Humidity
Insulation testing
Laboratories
Performance evaluation
Probability
Temperature
Voltage control
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Zusammenfassung:In actual practice the withstand voltage level of air insulation is estimated by an extrapolation based on the 50% breakdown voltage, U 50% , and the standard deviation, σ both obtained by laboratory tests. For this extrapolation to be possible it is assumed that the breakdown probability follows a gaussian distribution. It is observed however that in many cases this distribution deviates appreciably from a normal. Unexpected inconsistencies of the breakdown probability are also observed. This particular behavior of air insulation is studied in the present report and a physical explanation is attempted.
ISSN:0018-9510
2995-6323
DOI:10.1109/T-PAS.1976.32282