1 Scope
2 Normative references
3 Terms and definitions
4 Service conditions
   4.1 General
   4.2 Normal service conditions
   4.3 Electromagnetic compatibility (EMC)
   4.4 Provision for unusual service conditions
   4.5 Transport and storage conditions
5 Tappings
6 Connections
7 Ability to withstand short circuit
8 Rating
   8.1 General
   8.2 Rated power
   8.3 Preferred values of rated power
   8.4 Operation at higher than rated voltage
   8.5 Operation with fan cooling
   8.6 Operation in an enclosure
9 Rating plate
   9.1 Rating plate fitted to the transformer
   9.2 Rating plate fitted to the transformer enclosure
10 Identification according to cooling method
   10.1 Identification symbols
   10.2 Arrangement of symbols
11 Temperature-rise limits
   11.1 Normal temperature-rise limits
   11.2 Reduced temperature rises for transformers designed
        for high cooling air temperatures or special air cooling
        conditions
   11.3 High altitude temperature rise correction
12 Insulation levels
   12.1 General
   12.2 Transformers for use at high altitudes
13 Climatic, environmental and fire behaviour classes
   13.1 Climatic classes
   13.2 Environmental classes
   13.3 Fire behaviour classes
   13.4 Test criteria for climatic, environmental and fire
        behaviour classes
14 General requirements for tests
15 Measurement of winding resistance (routine test)
16 Measurement of voltage ratio and check of phase displacement
   (routine test)
17 Measurement of short-circuit impedance and load loss
   (routine test)
18 Measurement of no-load loss and current (routine test)
19 Separate-source AC withstand voltage test (routine test)
20 Induced AC withstand voltage test (routine test)
21 Lightning impulse test (type test)
22 Partial discharge measurement (routine and special test)
   22.1 General
   22.2 Basic measuring circuit (typical only)
   22.3 Calibration of the measuring circuit
   22.4 Voltage application
   22.5 Partial discharge acceptance levels
23 Temperature-rise test (type test)
   23.1 General
   23.2 Methods of loading
   23.3 Winding temperature-rise correction for reduced current
   23.4 Determination of steady state conditions
24 Measurement of sound level (special test)
25 Short-circuit test (special test)
26 Environmental test (special test)
   26.1 General
   26.2 Validity of the test
   26.3 Testing procedure
27 Climatic test (special test)
   27.1 Thermal shock test (special test)
   27.2 Validity of the test
   27.3 Thermal shock test for C1 class transformers
   27.4 Thermal shock test for C2 class transformers
28 Fire behaviour test (special test)
   28.1 General
   28.2 Checking of corrosive and harmful gases emission
   28.3 Fire behaviour test for F1 class transformer
   28.4 Quantities to be measured and measuring devices
   28.5 Calibration of the test chamber without test object
   28.6 Test method
   28.7 Test report
   28.8 Criteria for evaluating the test results
29 Tolerances
30 Protection against direct contact
31 Degrees of protection provided by enclosures
32 Earthing terminal
33 Information required with enquiry and order
Annex A (informative) Installation and safety of dry-type
                       transformers
Annex ZA (normative) Normative references to international
                       publications with their corresponding
                       European publications
Figures
Tables