Revision Standard - Inactive-Superseded.A uniform method by which the thermal endurance of electrical insulation systems for dry-type specialty and general- purpose transformers can be compared is established. These insulation systems are intended for use in the types of transformers described in NEMA ST 1-1988 and NEMA ST 20-1992.
dry type; specialty; transformers; insulation system; temperature aging; test specimens; insulation
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