STUDY ON ELECTRICAL STRENGTH OF SUSPENSION INSULATORS IN STEEP IMPULSE VOLTAGE RANGE
IEEE Transactions on Power Delivery, 12 (2):
8-14 (1997)Abstract
High and steep lightning surge voltages sometimes
cause electrical punctures of suspension insulators. Microscopic
analysis clarifies electrical breakdown mechanism of ceramic material.
V-t characteristics of the insulators are closely examined. Chance of
the puncture depends on the dimensions of the insulators, steepness
of the impulse voltages and the number of impulse occurrences.
Empirical equations relating to these parameters has been established
based on laboratory test results. Calculation shows no risk of
puncture on the quality insulators for the impulse voltages of
2500kV/μs steepness which is required by the standards.
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