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Description / Abstract:
This standard applies to equipment for three-phrase
alternating-current (ac) systems having a system voltage above 1 kV
nominal and, except for some definitions, includes only
phase-to-ground insulation.
Purpose
The object of this standard is to guide the preparation of
specifications for insulation of the various items of equipment in
a given installation. For the tests prescribed in this standard,
the values of the basic lightning impulse insulation levels (BILs)
and the basic switching impulse insulation levels (BSLs) shall be
chosen from the preferred values of this standard. Each standards
developer shall be responsible for specifying the BILs, BSLs, and
test procedures suitable for its equipment, incorporating the
content of this standard where practical.