Switching impulse tests were performed on single-column station post insulators having heights from 5 to 20 feet mounted atop grounded support structures having heights from 8 to 20 feet. Wavefronts of 120- and 1000-μs were used. Results can be used to obtain preliminary estimates of requirements for EHV and UHV stations.
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Hileman et al. (1973) studied this question.
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