IEEE C57.134-2013 pdf download IEEE Guide for Determination of Hottest-Spot Temperature in Dry-Type Transformers
2. Normative references
The following referenced documents are indispensable for the application of this document (i.e, they mustbe understood and used, so cach referenced document is cited in text and its relationship to this document isexplained). For dated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments or corrigenda) applies.
IEEE Std C57.12.9]TM, IEEE Standard Test Code for Dry-Type Distribution and Power Transformers.
3 Definitions
For the purposes of this document, the following terms and definitions apply. The IEEE StandardsDictionary Online should be consulted for terms not defined in this clause.
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 theterminals of the winding in accordance with the test procedures specified in IEEE Std C57.12.91TM.
hot-spot: A non-recommended abbreviated term frequently used as a synonym for the maximum, orhottest-spot, temperature rise of a winding.
maximum (hottest-spot) winding temperature: The maximum or hottest temperature of the currentcarrying components of a transformer winding in contact with insulation or insulating fluid. The hottestspot temperature is a naturally occurring phenomenon due to the generation of losses and the heat transfeiphenomena. It is the highest temperature inside the transformer winding and is greater than the measuredaverage winding temperature of the coil conductors. All transformers have a maximum (hottest-spot)winding temperature.
NOTE-In this guide, the hottest-spot rise is not considered to be due to localized manufacturing defects.
maximum (hottest-spot) winding temperature rise: The arithmetic difference between maximum(hottest-spot) winding temperature and the ambient temperature.
prototype transformer: A transformcr manufactured primarily to obtain enginccring data or cvaluatcmanufacturing 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.
temperature rise: The difference between the temperature of the part under consideration (commonly theaverage winding rise or the maximum (hottest-spot) winding temperature rise) and the ambicnttemperature.
IEEE C57.134-2013 pdf download
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