HD 635 S1:1997

HD 635 applies to tests on radial-field impregnated-paper insulated cables and accessories which, during normal operation, work under a gas pressure exceeding 1200 kPa (12 bar) applied outside a sheath or jacket, so that the gas is not in direct contact with the insulation. The tests are applicable to cables and accessories intended to be used in systems with a nominal voltage not exceeding 275 kV between phases.This Part (Part 11 specifies the general test methods applicable to these cables, unless otherwise specified in the particular sections of Part 3 of this HD. However, the summary of tests as listed in one only of the particular sections in Part 3 of this HD is mandatory for the particular cables ordered.Part 2 specifies additional test methods applicable only to certain particular sections of Part 3 of this HD.Part 3 specifies the lists of tests applicable to the particular cable type.