Title :
Inhomogeneous field breakdown in GIS-the prediction of breakdown probabilities and voltages. II. Ion density and statistical time lag
Author :
Wiegart, N. ; Niemeyer, L. ; Pinnekamp, F. ; Boeck, W. ; Kindersberger, J. ; Morrow, R. ; Zaengl, W. ; Zwicky, M. ; Gallimberti, L. ; Boggs, S.A.
Author_Institution :
BBC Res. Lab., Baden, Switzerland
fDate :
7/1/1988 12:00:00 AM
Abstract :
For pt.I see ibid., vol.3, no.3, p.923-30 (1988). An improved model for the calculation of statistical time lags in SF6 insulated electrode arrangements for positive impulse voltage is presented. On the basis of physical considerations, the production rate of initial electrons is ascribed to the local density of negative SF6 ions and to field dependent electron detachment. Values of negative ion densities are measured directly, while the detachment coefficient is determined by a fitting procedure to measurements of statistical time lags
Keywords :
electric breakdown of solids; gaseous insulation; ion density; substations; sulphur compounds; SF6 insulated electrode arrangements; breakdown probabilities; breakdown voltages; electron production rate; field dependent electron detachment; gas insulated substations; inhomogeneous field breakdown; ion density; negative SF6 ions; positive impulse voltage; statistical time lags; Breakdown voltage; Electric breakdown; Electrons; Insulation; Laboratories; Nonuniform electric fields; Probability; Production; Sulfur hexafluoride; Testing;
Journal_Title :
Power Delivery, IEEE Transactions on
