1 General
   1.1 Scope
   1.2 Service conditions
2 Normative references
3 Definitions
4 List of variables
5 Ratings
   5.1 General
   5.2 Rated voltage
   5.3 Rated current
   5.4 Rated frequency
   5.5 Rated power
6 Tolerances
   6.1 General
   6.2 Short-circuit impedance tolerances
   6.3 Guarantees
7 Losses
   7.1 General
   7.2 No-load loss
   7.3 Load loss under rated power-frequency
       conditions
   7.4 Load loss under service conditions
   7.5 Determination of hot-spot temperature
8 Insulation levels
   8.1 Line windings
   8.2 Valve windings
   8.3 Induced voltage level with partial discharge
       measurements
9 Sound level
   9.1 General
   9.2 Guaranteed sound-power levels
   9.3 Sound-power level at site
10 Testing
   10.1 General
   10.2 Tests
   10.3 Load-loss measurements
   10.4 Factory dielectric tests
   10.5 Temperature-rise test
   10.6 Load-current test
   10.7 Determination of transformer sound-power
        level
11 High-frequency modelling
12 Loading of transformer above rating
13 Bushings
   13.1 AC bushings
   13.2 Valve winding bushings
14 Tap-changer
   14.1 General
   14.2 Current wave shape
Bibliography
Table 1 - Test conditions for three-winding
          transformers
Annex ZA (normative) Normative references to
                     international publications
                     with their corresponding
                     European publications