IEEE DRAFT C57.12.00 : D4 98

1. Overview
   1.1 Scope
   1.2 Word Usage
2. Terminology
3. Definitions
4. Service conditions
   4.1 Usual service conditions
   4.2 Loading at other than rated conditions
   4.3 Unusual service conditions
5. Rating data
   5.1 Cooling classes of transformers
   5.2 Frequency
   5.3 Phases
   5.4 Rated kilovoltamperes
   5.5 Voltage ratings and taps
   5.6 Connections
   5.7 Polarity, angular displacement, and terminal markings
   5.8 Impedance
   5.9 Total losses
   5.10 Insulation levels
   5.11 Temperature rise and loading conditions
   5.12 Nameplates
6. Construction
   6.1 Bushings
   6.2 Transformer Accessories
   6.3 Bushing current transformers
   6.4 Thermometer Wells
   6.5 Tank pressure requirements
   6.6 Liquid insulation system
   6.7 Grounding
   6.8 Minimum external clearances between transformer live
       parts of different phases of the same voltage
7. Short circuit characteristics
   7.1 Requirements
   7.2 Components
   7.3 Base kilovoltamperes
   7.4 Calcuation of winding temperature during a short circuit
8. Testing and Calculations
   8.1 General
   8.2 Routine, Design, and Other Tests for Transformers
   8.3 Additional Routine Tests on Transformers with load
       tap changing or regulating transformers
   8.4 Determination of transformer regulation
9. Tolerances
   9.1 Tolerances for Ratio
   9.2 Tolerances for Impedance
   9.3 Tolerances for Losses
   9.4 Accuracies Required for Measuring Losses
10 Connection of Transformers for Shipment
Annex A Bibliography

Establishes the safety requirements, performance and limited electrical and mechanical interchangeability of the equipment described and the proper selection of such equipment including autotransformers, power transformers and regulating transformers.