1. Overview
1.1 Scope
1.2 Purpose
2. References
3. Definitions
4. Merits of operating at high temperatures
5. Insulation-system temperature ratings, test
procedures and material-aging qualification
5.1 Insulation-system temperature ratings for 55 deg C
and 65 deg C rise systems
5.2 Insulation-system temperature ratings for high-
temperature rise systems
5.3 Hybrid high-temperature insulation systems
5.4 Aging test procedure for material qualification
5.5 Aging test procedure for hybrid high-temperature
insulation-system qualification
5.6 High-temperature solid and wire insulation and their
interaction with mineral oil and other high-temperature
fluids
6. Loading guides for high-temperature transformers
7. Description of high-temperature transformers
7.1 Transformers with hybrid high-temperature insulation
systems
7.2 Transformers with high-temperature insulation systems
8. Nameplate information
9. Heat run test and average winding temperature
Annex A (normative) Gas analysis
A.1 Dissolved gas-in-oil for transformers insulated
with high-temperature materials
A.2 Thermal aging of an aramid/cellulose/mineral oil
hybrid system
A.3 Generation of gas under arcing conditions
Annex B (informative) Bibliography