EN 61378-2:2001

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

This part of EN 61378 applies to oil-immersed three-phase and -single-phase convertor transformers for use in HVDC power transmission. It applies to transformers having two, three or multiple windings. This standard does not apply to convertor transformers for industrial applications (see EN 61378-1) and to convertor transformers for traction applications (see EN 60310).