EN 50482:2008

1 General
   1.1 Scope
   1.2 Normative references
2 Definitions
3 General requirements
4 Normal and special service conditions
5 Ratings
   5.1 Standard values of rated voltages
   5.2 Standard values of rated output
   5.3 Standard values of rated voltage factor
   5.4 Limits of temperature rise
6 Design requirements
   6.1 Insulation requirements
   6.2 Short-circuit withstand capability
7 Classification of tests
8 Type tests
   8.1 Temperature-rise tests
   8.2 Short-circuit withstand capability test
   8.3 Impulse test on primary winding
   8.4 Wet test for outdoor type transformers
9 Routine tests
   9.1 Verification of terminal markings
   9.2 Power frequency tests on primary winding and partial
        discharge measurement
   9.3 Power-frequency tests between section and on secondary
        windings
10 Special test
11 Markings
   11.1 Rating plate and markings
   11.2 Terminal markings
12 Accuracy requirements for three-phase inductive measuring
   voltage transformers
   12.1 Accuracy class designation for measuring voltage
        transformers
   12.2 Limits of voltage error and phase displacement for
        measuring voltage transformers
   12.3 Type test for accuracy of measuring voltage transformers
   12.4 Routine test for accuracy of measuring voltage transformers
   12.5 Markings of the rating plate of three-phase measuring
        voltage transformer
13 Additional requirements for three-phase inductive protective
   voltage transformers
   13.1 Accuracy class designation for protective voltage
        transformers
   13.2 Limits of voltage error and phase displacement for
        protective voltage transformers
   13.3 Rated voltages for secondary windings intended to produce a
        residual voltage
   13.4 Output for secondary windings intended to produce a residual
        voltage
   13.5 Accuracy class for secondary windings intended to produce a
        residual voltage
   13.6 Type test for protective voltage transformers
   13.7 Routine test for protective transformers
   13.8 Markings of the rating plate of a three-phase protective
        voltage transformer
Bibliography

This European Standard specifies the requirements and tests for new three-phase voltage transformers with Um up to 52 kV and frequencies from 15 Hz to 100 Hz, for use with electrical instruments or electrical protective devices. NOTESingle-phase voltage transformers connected in a three-phase bank are not covered in this document.