Abstract
Insulators on HVDC lines may be damaged or
lose their mechanical strength by electrolytic
corrosion of the metal hardware. DC exposure tests of
insulators have been conducted for 20 years at the
Central Research Institute of Electric Power Industry.
This paper describes the results of investigation on
the electrolytic corrosion of the metal hardware of DC
disc and cylindrical insulators and on the leakage
electricity quantity flowing on their surface. It also
describes methods of life estimation of the metal
hardware of insulators and prevention against the
corrosion.
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