IEEE P95

Revision Standard - Active - Draft.
This recommended practice provides uniform methods for testing insulation with high direct voltage, specifically form-wound windings of rotating ac electric machines typically rated 2300 V or higher. Recommendations for both (a) routine maintenance or repair testing of a machine that has been in service and (b) acceptance testing of new equipment in the factory or in the field after installation where DC testing is selected are defined.

This recommended practice provides uniform methods for testing insulation with high direct voltage, specifically form-wound windings of ac electric machines typically rated 2300 V or higher. Recommendations for both (a) routine maintenance or repair testing of a machine that has been in service and (b) acceptance testing of new equipment in the factory or in the field after installation where DC testing is selected are defined.
The purpose of this recommended practice is to:
a) Provide uniform procedures for performing high direct-voltage acceptance tests, routine maintenance, and repair 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.
d) Assess the test levels for different conditions: repair, maintenance and acceptance.