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IEEE 43 2000

$52.54

IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery

Published By Publication Date Number of Pages
IEEE 2000 27
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Revision Standard – Active. This document describes the recommended procedure for measuring insulation resis-tance of armature and field windings in rotating machines rated 1 hp, 750 W or greater. It applies to synchronous machines, induction machines, dc machines, and synchronous condensers. Con-tained within this document is the general theory of insulation resistance (IR) and polarization index (P.I.), as well as factors affecting the results, test procedures, methods of interpretation, test limita-tions, and recommended minimum values.

PDF Catalog

PDF Pages PDF Title
1 Title Page
3 Introduction
Participants
5 CONTENTS
7 1. Overview
1.1 Scope
1.2 Purpose
8 2. References
9 3. Definitions
4. Safety considerations
10 5. Insulation resistanceā€”general theory
5.1 Components of the measured direct current
12 5.2 Characteristics of the measured direct current
5.3 Insulation resistance readings
13 5.4 Polarization index readings
14 5.5 Discharge current
6. Factors affecting insulation resistance
6.1 Effect of surface condition
15 6.2 Effect of moisture
6.3 Effect of temperature
17 6.4 Effect of test voltage magnitude
18 6.5 Effect of existing charge on winding resistance measurements
7. Conditions for measuring insulation resistance
8. Winding connections for insulation resistance tests
19 9. Methods of measuring insulation resistance
9.1 Direct measurement
9.2 Calculated measurement
10. Precautions
20 11. Interpretation of insulation resistance and polarization index
11.1 Monitoring insulation condition
11.2 Suitability for operaton or continued testing
21 11.3 Limitations of the insulation resistance test
12. Recommended minimum value of polarization index and insulation resistance
12.1 Minimum values
12.2 Polarization index
22 12.3 Insulation resistance
24 Annex Aā€”Variants in polarization index
25 Annex Bā€”Direct versus alternating voltage testing
26 Annex Cā€”Regulation in power supplies used for insulation resistance measurement
IEEE 43 2000
$52.54