IEEE C57.134:2000 (R2006)

New IEEE Standard - Superseded.
Methodologies for determination of the steady-state winding hottest-spot temperature in dry-type distribution and power transformers with ventilated, sealed, solid cast, and encapsulated windings built in accordance with IEEE Std C57.12.01-1998 and IEC 60726 (1982-01) are de-scribed in this guide. Converter transformers are not included in this guide.

This guide describes methodologies for determination of the steady-state winding hottest-spot temperature in dry-type distribution and power transformers with ventilated, sealed, solid cast, and encapsulated windings built in accordance with IEEE Std C57.12.01-1998 and IEC 60726 (1982-01). Converter transformers are not included in this guide.
Assumption regarding the relation of hot spot temperature to average winding temperature rise are not representative of all dry type transformer constructions and winding size. A uniform methodology for determination of hottest spot termperature will provide consistency in testing/calculation for Manufacturers' verification of the hotspot to the user, and for validation/review of hot spot temperature limits specified in C57.12.01.