02233nam 2200373 450 991013576990332120231206190633.00-7381-0863-410.1109/IEEESTD.1986.82562(CKB)3780000000089300(NjHacI)993780000000089300(EXLCZ)99378000000008930020231206d1986 uy 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierANSI/IEEE Std C57.12.56-1986 IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution Transformers /Institute of Electrical and Electronics EngineersNew York, New York :IEEE,1986.1 online resource (20 pages)This IEEE Standards product is part of the C57 family on Power Distribution and Regulating Transformers. A test procedure for determining the temperature classification of ventilated dry-type power and distribution transformer insulation systems by test rather than by chemical composition is established. The intent is to provide a uniform method for providing data for selection of the temperature classification of the insulation system, for providing data that may be used as a basis for a loading guide, and for comparative evaluation of different insulation systems. Voltage-withstand endpoint criteria are related to the impulse voltage distribution within the coil or to the initial voltage-withstand of the coil. A relationship between impulse withstand of the insulation and short-term 60-Hz-withstand is identified so that 50/60--Hz testing of model coils is possible.ANSI/IEEE Std C57.12.56-1986: IEEE Standard Test Procedure for Thermal Evaluation of Insulation Systems for Ventilated Dry-Type Power and Distribution TransformersElectric switchgearStandardsStandards, EngineeringElectric switchgearStandards.Standards, Engineering.621.317NjHacINjHaclDOCUMENT9910135769903321ANSI2072434UNINA