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Life Line Characteristics of Solid Insulation under Electrical Stress
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Insulating materials subjected to electrical and thermal-electrical stresses exhibit life line characteristics which show a tendency to reach an electrical threshold. Their fit is investigated with reference to several sets of data derived from accelerated life tests performed on different insulating materials.
Life line models provide the estimates of failure time percentiles at selected probabilities and stresses so that life curves at fixed failure probabilities can be drawn. These characteristics should help in the choice of compatible thermal and electrical stresses for the design of insulation systems, apparatus and components.
The tests to be conducted to plot the characteristic curves involve Class B insulation (up to 8 specimens) under three active stress levels. Subsequently, using the data acquired, the Weibull probability distribution curves are plotted using STATISTICA software.
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