SN EN 60044-7 : 2000

1 General
      1.1 Scope
      1.2 Normative references
      1.3 General block diagram of electronic voltage
             transformers
2 Definitions
      2.1 General definitions
      2.2 Additional definitions for single-phase
             electronic protective voltage transformers
      2.3 Index of symbols
3 General requirements
      3.1 General
      3.2 Information to be given for enquiries,
             tenders and orders
4 Normal and special service conditions
      4.1 Normal service conditions
      4.2 Special service conditions
      4.3 Earthing system
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 Standard values of rated auxiliary power
             supply voltage
      5.5 Standard reference values of other influencing
             parameters
6 Design requirements
      6.1 Insulation requirements for primary voltage
             sensor
      6.2 Insulation requirements for low-voltage
             components
      6.3 Short-circuit withstand capability
      6.4 Limits of temperature rise
      6.5 Radio interference voltage requirements
      6.6 Transmitted overvoltage requirements
      6.7 Electromagnetic compatibility requirements
      6.8 Reliability
      6.9 Abnormal conditions withstand capability
      6.10 Abnormal conditions signalling
      6.11 Mechanical requirements
      6.12 Earthing terminals
7 Classification of tests
      7.1 Type tests
      7.2 Routine tests
      7.3 Special tests
8 Type tests
      8.1 Impulse test on primary voltage terminals
      8.2 Wet test for outdoor type electronic voltage
             transformers
      8.3 Tests for accuracy
      8.4 Test for abnormal conditions withstand capability
      8.5 Radio interference voltage test
      8.6 Transmitted overvoltage test
      8.7 Electromagnetic compatibility tests
      8.8 Impulse voltage withstand test for low-voltage
             components
      8.9 Transient performance tests
9 Routine tests
      9.1 Verification of terminal markings
      9.2 Power-frequency withstand tests on primary
             voltage terminals and partial discharge
             measurement
      9.3 Power-frequency voltage withstand test for
             low-voltage components
      9.4 Tests for accuracy
10 Special tests
      10.1 Chopped lightning-impulse test on primary voltage
             terminals
      10.2 Measurement of capacitance and dielectric
             dissipation factor
      10.3 Mechanical strength tests
11 Markings
      11.1 Rating plate markings
      11.2 Terminal markings
12 Accuracy requirements for single-phase electronic
      measuring voltage transformers
      12.1 General requirements
      12.2 Maintenance requirement
      12.3 Accuracy class designation for electronic
             measuring voltage transformers
      12.4 Standard accuracy classes for electronic
             measuring voltage transformers
      12.5 Limits of voltage error and phase displacement
             for electronic measuring voltage transformers
13 Additional requirements for single-phase electronic
      protective voltage transformers
      13.1 General requirements
      13.2 Maintenance requirements
      13.3 Accuracy class designation for electronic
             protective voltage transformers
      13.4 Standard accuracy classes for electronic
             protective voltage transformers
      13.5 Limits of voltage error and phase displacement
             for electronic protective voltage transformers
      13.6 Transient performance requirements
Annex A (normative) Burdens for the transient response test
Annex B (informative) Technical information for electronic
                      voltage transformers
Annex C (informative) Bibliography
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Applies to newly manufactured electronic voltage transformers with analogue output, intended for use with electrical measuring instruments and electrical protective devices at frequencies between 15 Hz and 100 Hz.