NBN EN 60044-5 : 2005

1 Scope
2 Normative references
3 Terms and definitions
   3.1 General definitions
   3.2 Capacitor voltage divider definitions
   3.3 Electromagnetic unit definitions
   3.4 Carrier-frequency accessories definitions
4 General requirements
5 Service conditions
   5.1 Normal service conditions
   5.2 Special service conditions
   5.3 System earthing
6 Ratings
   6.1 Standard values of rated frequency
   6.2 Standard values of rated voltages
   6.3 Standard values of rated output
   6.4 Standard values of rated voltage factor
   6.5 Limits of temperature rise
7 Design requirements
   7.1 Insulation requirements
   7.2 Other insulation requirements
   7.3 Short-circuit withstand capability
   7.4 Ferro-resonance
   7.5 Electromagnetic emission requirements
   7.6 Mechanical requirements
   7.7 Tightness of capacitor voltage divider and
        electromagnetic unit
8 Classification of tests
   8.1 Type tests
   8.2 Routine tests
   8.3 Special tests
   8.4 Test sequence for one or two units
9 Type test
   9.1 Temperature-rise test
   9.2 Capacitance and tan[delta] measurement at power-frequency
   9.3 Short-circuit withstand capability test
   9.4 Impulse tests
   9.5 Wet test for outdoor capacitor voltage transformer
   9.6 Ferro-resonance tests
   9.7 Tightness test of a liquid-filled electromagnetic unit
   9.8 Accuracy tests
   9.9 Transient response test
   9.10 Radio interference voltage test
10 Routine tests
   10.1 Tightness of the liquid-filled capacitor voltage divider
   10.2 Power-frequency withstand test and measurement of
        capacitance, tan[delta] and partial discharge
   10.3 Verification of terminal markings
   10.4 Power-frequency withstand tests on the electromagnetic
        unit
   10.5 Ferro-resonance check
   10.6 Accuracy check
11 Special tests
   11.1 Measurement of the transmission factor of high frequency
        over voltages
   11.2 Mechanical strength test
   11.3 Determination of the temperature coefficient (T[C])
   11.4 Tightness design test of capacitor units
12 Marking of the capacitor units
   12.1 General
   12.2 Marking
13 Terminal markings
   13.1 General
   13.2 Markings
14 Additional requirements for measuring capacitor voltage
   transformer
   14.1 Accuracy class designation
   14.2 Standard reference range of frequency
   14.3 Standard accuracy classes
   14.4 Limits of voltage error and phase displacement
   14.5 Tests for accuracy
15 Additional requirements for protective capacitor voltage
   transformers
   15.1 Accuracy class designation
   15.2 Standard reference range of frequency
   15.3 Standard accuracy classes
   15.4 Limits of voltage error and phase displacement
   15.5 Transient response
   15.6 Requirements for secondary windings intended to
        produce a residual voltage
16 Rating plate
   16.1 Markings of the rating plate
   16.2 Example of a typical rating plate
17 Requirements for carrier - frequency accessories
   17.1 General
   17.2 Drain coil and voltage limitation device
   17.3 Type tests for carrier frequency accessories
   17.4 Routine tests for carrier frequency accessories
   17.5 Marking of the rating plate
Annex A (normative) Typical diagram of a capacitor voltage
                    transformer
Annex B (informative) Transient response of capacitor voltage
                      transformer under fault conditions
Annex C (normative) High-frequency characteristics of
                    capacitor voltage transformers
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications
Bibliography

Applies to new single-phase capacitor voltage transformers connected between line and ground for system voltages U[m] >= 72,5 kV at power frequencies from 15 Hz to 100 Hz. They are intended to supply a low voltage for measurement, control and protective functions.