IEC 60076-2:2011

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Cooling methods
5 Normal cooling conditions
6 Temperature rise limits
7 Temperature rise tests
Annex A (informative) - Hot-spot winding temperature
        rise determination for OFAF and OFWF cooled
        transformers based on the top-liquid temperature
        in tank
Annex B (informative) - Methods to estimate the hot-spot
        winding temperature rises
Annex C (informative) - Techniques used in temperature rise
        testing of liquid-immersed transformers
Annex D (informative) - Dissolved gases analysis for the
        detection of local overheating
Annex E (informative) - Application of optical fibre sensors for
        winding hot-spot measurements
Bibliography

IEC 60076-2:2011 applies to liquid-immersed transformers, identifies power transformers according to their cooling methods, defines temperature rise limits and gives the methods for temperature rise tests. This new edition includes the following significant technical changes with respect to the previous edition:
- the winding hot-spot temperature rise limit was introduced among the prescriptions;
- the procedures for the temperature rise test were improved in relation to the new thermal requirements;
- five informative annexes were added in order to facilitate the implementation of this standard.