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Description / Abstract:
This recommended practice provides uniform methods for testing
insulation with high direct voltage. It applies to stator
(armature) windings of ac electric machines rated 2300 V or higher.
It covers acceptance testing of new equipment in the factory or in
the field after installation, and routine maintenance testing of
machines that have been in service.
Purpose
The purpose of this recommended practice is to:
a) Provide uniform procedures for performing high direct-voltage
acceptance tests and routine maintenance tests on the main ground
insulation of windings of ac electric machines.
b) Provide guidance in analyzing the variations in measured
current versus applied voltage so that the condition of the
insulation can be more effectively assessed.
c) Compare direct-voltage testing with alternating voltage
testing.