TEST PROCEDURE FOR EVALUATION OF SYSTEMS OF INSULATION FOR DRY-TYPE SPECIALITY AND GENERAL-PURPOSE TRANSFORMERS
Institute of Electrical & Electronics Engineers
1 Overview
1.1 Scope
2 References
3 Insulation test specimens
4 Test procedures
4.1 Initial screening tests
4.2 Temperature aging
4.3 Mechanical stress
4.4 Thermal shock
4.5 Moisture exposure
4.6 Dielectric proof test
5 Interpretation of data
5.1 Criteria of failure
5.2 Method of determining average life
5.3 Extrapolation of data
5.4 Application of results
5.5 Report of results
Annex A (informative) Bibliography
Establishes a uniform method by which the thermal endurance of of electrical insulation systems for dry-type speciality and general-purpose transformers can be compared. These systems are meant for use in the types of transformers found in NEMA ST 1-1998 and NEMA ST 20-1992. Generally these dry-type transformers are used with primary windings connected to secondary distribution circuits of 600 V nominal and below.
| Document Type | Standard |
| Status | Current |
| Publisher | Institute of Electrical & Electronics Engineers |
| Supersedes |
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