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The results are reported on about 5000 separate switching surge tests carried out on mocked-up and prototype towers by the General Electric Company at Project EHV in Pittsfield, Mass., and by Centro Elettrotecnico Sperimentale Italiano (CESI) in Milan, Italy. From these tests, a composite tower insulation strength was determined for switching surges in the 1400-to 1600-kV range, and these results were the basis for the tower design of the Manicouagan 735-kV transmission system.
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Aubin et al. (1966) studied this question.
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