Conference,

SPACE OCCUPATION OF EHV AND UHV TRANSMISSION LINES AS AFFECTED BY THE SWITCHING IMPULSE STRENGTH OF PHASE-TO-PHASE INSULATION

, , , and .
(1981)

Abstract

The paper summarizes the results of an extensive research program on the switching surge perfor mance of phase-to-phase insulation of transmissionlines, carried out in the last few years in the framework of the lOOOkV Project. Preliminary information is also given concerning the switching impulse strength of the phase-to-earth insulation at the tower, with particular reference to non conventional supports. The strength characteristics, combined with available data on the overvoltages, are used to estimate the minimum clerances required to withstand the switching surges. Considerations on the space occupation are presented, taking into account the requirement to withstand the operating voltage under severe contamination.

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