By Dr. A. Haddad, Doug Warne
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Extra info for Advances in High Voltage Engineering
9. 2 Sparkover under slow front impulse voltage The IEC Standard 60060-1 (1989)  defines a standard slow front impulse having a nominal rise time of 250 μs and a decay time to half value of 2500 μs. In practice, a variety of rise and decay times is encountered and it is necessary to consider, in a general way, the nature of the processes involved in breakdown. 6 and the associated qualitative arguments indicates at once that where the voltage rises relatively slowly, there is a relationship between the voltage rise time, the leader growth rate and the gap length which will determine the voltage at which breakdown occurs.
This raises two questions: (i) (ii) are there sufficient free electrons created in this direction to allow this process to proceed? what is the weakest applied field in which replication can occur? Regarding case (i), the formation time of the avalanche is less than 1 ns, but the positive ion space charge, having a mobility of 10−4 metres per second per volt per metre of field, would have a velocity of only 300 ms−1 in a field of 3 × 106 Vm−1 . Thus, under the influence of this charge, a significant time is available for the detachment of electrons from negative ions.
Appl. , 1976, 47, pp. : ‘Some experimental observations of the propagation of streamers in low-field regions of an asymmetrical gap’, J. Appl. , 1969, 40, pp. : ‘Positive streamer gradient and average breakdown voltage as functions of humidity’. : ‘Study of electric fields required for streamer propagation in humid air’, IEE Proc. A, Sci. Meas. , 1991, 138, pp. : ‘The conditions required for the propagation of a streamer in air’, J. Phys. D, Appl. , 1995, 28, pp. : ‘Dynamics of streamer propagation in air’, J.
Advances in High Voltage Engineering by Dr. A. Haddad, Doug Warne