The Statistical Analysis of a High Voltage Endurance Test on an Epoxy

Stone, G.C.; Kurtz, M.; Heeswijk, R. G. van

doi:10.1109/tei.1979.298187

Cited by 44 publications

(6 citation statements)

References 7 publications

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“…Each zone corresponds to a given type of aging. The presence of several segments of straight line in lifetime characteristic has been reported elsewhere 1, 3, 18. Note that the weaker the applied voltage, the longer the time to breakdown is.…”

Section: Resultssupporting

confidence: 67%

Weibull statistics in electrical aging of polyesterimide under AC voltage

Nedjar

Béroual

2010

J of Applied Polymer Sci

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This article is aimed at the investigation of electrical aging of polyesterimide under AC voltage using Weibull statistical analysis. It's shown that the time to breakdown characteristic (V-t) of polyesterimide includes two zones (segments of straight line). The first zone characterizes a statistical dispersion of the intrinsic defects of material. The second zone expresses the real aging of polymer. The variation of the slope of lifetime curve is attributed to the change in the degradation mechanism.

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Section: Resultssupporting

confidence: 67%

Weibull statistics in electrical aging of polyesterimide under AC voltage

Nedjar

Béroual

2010

J of Applied Polymer Sci

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“…The results of this study indicates that the RIP insulation system at normal operating temperature (80C) can be represented by a power law model given by (8) and (10). A combined stress model based on accelerated thermal and electrical stress is currently under way.…”

Section: Estimation Of the Power Lawmentioning

confidence: 93%

“…Hence, the power law model parameters K and n are estimated to 112.218 10 6 and 3.724 respectively. Then, (1) will take the form L(E) = 112.218 10 6 E −3.724 (10) V. CONCLUSION…”

Section: Estimation Of the Power Lawmentioning

confidence: 99%

“…This can only be made if analytical methods of parameter estimation are resorted to. A large body of literature is available for life estimation of insulation under Accelerated Electrical, thermal, mechanical stresses and their combination [1] - [10]. In the present paper, inverse power law parameter estimation, both point and interval, using pooled estimation method, in addition to Maximum Likelihood Methods (MLE) is suggested.…”

Section: Introductionmentioning

confidence: 99%

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Statistical Methods for Accelerated Life Testing with Particular Reference to Resin Impregnated Paper Bushings

Jyothi

Ramu

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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Electrical failure of insulation is known to be an extremal random process wherein nominally identical pro-rated specimens of equipment insulation, at constant stress fail at inordinately different times even under laboratory test conditions. In order to be able to estimate the life of power equipment, it is necessary to run long duration ageing experiments under accelerated stresses, to acquire and analyze insulation specific failure data. In the present work, Resin Impregnated Paper (RIP) a relatively new insulation system of choice used in transformer bushings, is taken as an example. The failure data has been processed using proven statistical methods, both graphical and analytical. The physical model governing insulation failure at constant accelerated stress has been assumed to be based on temperature dependent inverse power law model.Index Terms-epoxy resin impregnated insulation, EHV insulation, life estimation, maximum likelyhood estimation.

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“…An unfilled, room-temperature cure epoxy (Emerson and Cuming Stycast 1264) was used to mold the samples, which are similar to those used successfully in previous studies [4].…”

Section: Partial Discharge Sourcesmentioning

confidence: 99%