This document provides instructions for conducting insulation resistance tests on machine windings and interpreting the results. It outlines the objective, scope, referenced documents, definitions, machine conditions, test conduction, and interpretation of test results including winding connections, temperature corrections, minimum insulation resistance values, polarization index, and insulation time constant. It also provides guidance on drying windings if needed and writing nonconformity reports for any deviations from nominal specifications.

1. Table of Content:
1 Objective.......................................................................................................
2 Scope............................................................................................................
3 Referenced Documents.................................................................................
4 Definitions and Abbreviations........................................................................
5 Machine condition..........................................................................................
6 Conduction of test..........................................................................................
7 Interpretation of test results...........................................................................
7.1 Winding connection...........................................................................
7.2 Correction for temperature.................................................................
7.3 Minimum values for insulation resistance.........................................
7.4 Polarization index P.I. (ratio of 10-min / 1-min insulation resistance)
7.5 Insulation time constant of HV-stator windings τ = R10.C (MΩ.µF = s)
8 Drying of windings.........................................................................................
9 Proceeding in case of deviations...................................................................
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5. 9 Proceeding in case of deviations
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6. Any nominal value, minimum value, maximum value, tolerance etc given
in an instruction is intended to serve for quality control purposes only.
In case of deviations, a nonconformity report must to be written according
to international standard
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7. Any nominal value, minimum value, maximum value, tolerance etc given
in an instruction is intended to serve for quality control purposes only.
In case of deviations, a nonconformity report must to be written according
to international standard
Page 6 of 6