SN EN 60076-1 : 1997 AMD 12 2002

Foreword
1 Scope and service conditions
   1.1 Scope
   1.2 Service conditions
2 Normative references
3 Definitions
   3.1 General
   3.2 Terminals and neutral point
   3.3 Windings
   3.4 Rating
   3.5 Tappings
   3.6 Losses and no-load current
   3.7 Short-circuit impedance and voltage drop
   3.8 Temperature rise
   3.9 Insulation
   3.10 Connections
   3.11 Kinds of tests
   3.12 Meteorological data with respect to cooling
4 Rating
   4.1 Rated power
   4.2 Loading cycle
   4.3 Preferred values of rated power
   4.4 Operation at higher than rated voltage and/or
        at disturbed frequency
5 Requirements for transformers having a tapped winding
   5.1 General - Notation of tapping range
   5.2 Tapping voltage - tapping current. Standard
        categories of tapping voltage variation.
        Maximum voltage tapping
   5.3 Tapping power. Full-power tappings - reduced-power
        tappings
   5.4 Specification of tappings in enquiry and order
   5.5 Specification of short-circuit impedance
   5.6 Load loss and temperature rise
6 Connection and phase displacement symbols for three-phase
   transformers
7 Rating plates
   7.1 Information to be given in all cases
   7.2 Additional information to be given when applicable
8 Miscellaneous requirements
   8.1 Dimensioning of neutral connection
   8.2 Oil preservation system
   8.3 Load rejection on generator transformers
9 Tolerances
10 Tests
   10.1 General requirements for routine, type and special
        tests
   10.2 Measurement of winding resistance
   10.3 Measurement of voltage ratio and check of
        phase displacement
   10.4 Measurement of short-circuit impedance and
        load loss
   10.5 Measurement of no-load loss and current
   10.6 Measurement of the harmonics of the no-load
        current
   10.7 Measurement of zero-sequence impedance(s) on
        three-phase transformers
   10.8 Tests on on-load tap-changers
11 Electromagnetic compatibility
Annex A (normative) Information required with enquiry
                       and order
Annex B (informative) Examples of specifications for
                       transformers with tappings
Annex C (informative) Specification of short-circuit
                       impedance by boundaries
Annex D (informative) Three-phase transformer connections
Annex E (normative) Temperature correction of load loss
Annex F (informative) Bibliography
Annex ZA (normative) Normative references to international
                       publications with their corresponding
                       European publications
Annex ZB (informative) Installation and safety of a liquid
                       immersed transformer

Applicable to three-phase and single-phase power transformers (includes auto-transformers) excepting certain categories of small and special transformers, eg single-phase transformers with rated power less than 1 kVA and three-phase transformers less than 5 kVA, instrument transformers, transformers for static convertors, traction transformers mounted on rolling stock, starting, testing and welding transformers.