IEEE C57.134-2000 pdf download IEEE Guide for Determination of Hottest-Spot Temperature in Dry-Type Transformers
1. Overview
1.1 Scope
This guide describes methodologies for determination of the steady-state winding hottest-spot temperaturein dry-type distribution and power transformers with ventilated, sealed, solid cast, and encapsulated wind.ings built in accordance with IEEE Std C57.12.01-1998 and IEC 60726 (1982-01). Converter transformersare not included in this guide
1.2 Purpose
Assumptions regarding the relation of winding hottest-spot temperature rise to average winding temperatureise are not representative of all dry-type transformer constructions and winding size. A uniform methodology for determination of winding hottest-spot temperature will provide consistency in testing and calcula-jions for manufacturers’ verification of the winding hottest-spot temperature to the user, and for validationand review of winding hottest-spot temperature limits
1.3 Applications
This guide is applicable to prototype and production unit dry-type transformers.
2. References
This guide is to be used in conjunction with the following publications. When the following publications aresuperseded by an approved revision, the revision applies.
IEC 60050-426 (1990-10), International Electrotechnical Vocabulary. Chapter 426: Electrical apparatus forexplosive atmospheres.
IEEE Std C57.12.91-1995,IEEE Standard Test Code for Dry-Type Distribution and Power Transformers.
3.Definitions
For the purposes of this guide, standard transformer terminology is defined in IEEE Std C57.12.80-1978Other electrical terms are defined in IEC 60050-426 (1990-10) and the IEEE Standard Dictionary of Electrical and Electronic Terms B6l.
Definitions of terms associated with transformer thermal performance and other terms used in this guide arelisted as follows:
3.1 average winding temperature rise: The arithmetic difference between the average winding temperatureand the ambient temperature as determined from the change in the ohmic resistance measured across the ter-minals of the winding in accordance with the test procedures specifed in IEEE Std C57 12.91-1995
3.2 hot-spot: A non-recommended abbreviated term frequently used as a synonym for the maximum or hot-test-spot temperature rise of a winding
3.3 maximum (hottest-spot) winding temperature: The maximum or hottest temperature of the currentcarrying components of a transformer winding in contact with insulation or insulating fuid. The hottest-spottemperature is a naturally occurring phenomena due to the generation of losses and the heat transfer phenomena. It is the highest temperature inside the transformer winding and is greater than the measured average winding temperature of the coil conductors. All transformers have a maximum (hottest-spot) windingtemperature
NOTE–In this guide, the hottest-spot rise is not considered to be due to localized manufacturing defects
3.4 maximum (hottest-spot) winding temperature rise: The arithmetic difference between maximum(hottest-spot) winding temperature and the ambient temperature
3.5 prototype transformer: A transformer manufactured primarily to obtain engineering data or evaluatemanufacturing or design feasibility. Prototypes may be pre-production units or units typical of currentdesigns manufactured for test purposes to obtain data to comply with changes in industry standards or forother reasons.
3.6 temperature rise: The difference between the temperature of the part under consideration (commonlythe average winding rise or the maximum (hottest-spot) winding temperature rise and the ambienttemperature
IEEE C57.134-2000 pdf download
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