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