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Overvoltages and insulation coordination on transmission networks

Overvoltages and insulation coordination on transmission networks

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This chapter reviews some aspects of insulation coordination and overvoltages on transmission networks. The purpose of insulation coordination is to ensure that the probability of insulation breakdown is limited to an acceptable value and that any breakdown is restricted to self-restoring insulation. It is based on computing the most severe overvoltages occurring on the network and relating these to the breakdown characteristics of the insulation through appropriate margins to obtain withstand voltages for the network components together with the statistical risk of insulation failure.

Inspec keywords: overvoltage; insulation; statistical analysis; electric breakdown

Other keywords: transmission network overvoltage; insulation coordination; insulation failure; statistical risk; insulation breakdown

Subjects: a.c. transmission; Dielectric breakdown and discharges; Power line supports, insulators and connectors

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