Preliminary report on the flashover performance of porcelain insulators on British Railways (TM-ETR-55)

Railway electrification at 25 kV, 50 Hz was introduced into this country on the Colchester-Clacton/Walton line in 1959. At that time certain standards for electrical clearance and insulator creepage lengths were adopted which have since been subject to reappraisal. Electrical clearances were reduced for the construction of the Euston-Crewe scheme...