HIGH VOLTAGE INSULATORS - IDC-Online

ELECTRICALHIGH VOLTAGE INSULATORSBy JP HoltzhausenThe principal dielectric used on overhead power lines is air at atmospheric pressure. The air, surrounding the bare high VOLTAGE alu-minium or steel- cored aluminium (ACSR) conductors, is a good insulating material, provided that the electric stress is kept below theionisation threshold. It is, however, necessary to attach the conductors at certain points onto the cross arms of the pylons. The prob-lem of reliably suspending the conductors of high VOLTAGE transmission lines has therefore been with us since the turn of the task is particularly complex, bearing in mind the multiple extreme stresses present: mechanical, electrical and environmental. high VOLTAGE INSULATORS havedeveloped rapidly since early thiscentury, beginning with simpleporcelain INSULATORS (I). Today,modern polymeric INSULATORS areused, as well as the earlier classification of the main types ofinsulators is shown schematicallyin figure pin type INSULATORS These were originally used for telephone lines and lightning conductors,have been adapted for power transmission and some variations arestill in use for medium VOLTAGE systems.

ELECTRICAL HIGH VOLTAGE INSULATORS By JP Holtzhausen The principal dielectric used on overhead power lines is air at atmospheric pressure. The air, surrounding the bare high voltage alu-

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  High, Voltage, Insulators, High voltage, High voltage insulators

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