Foreword
1 General
1.1 Scope
1.2 Normative references
2 Definitions
2.1 General definitions
2.2 Additional definitions for single-phase
inductive protective voltage transformers
3 General requirements
4 Normal and special service conditions
4.1 Normal service conditions
4.2 Special service conditions
4.3 System earthing
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
6.3 Mechanical requirements
7 Classification of tests
7.1 Type tests
7.2 Routine tests
7.3 Special tests
8 Type tests
8.1 Temperature-rise test
8.2 Short-circuit withstand capability test
8.3 Impulse test on primary winding
8.4 Wet test for outdoor type transformers
8.5 Radio interference voltage measurement
9 Routine tests
9.1 Verification of terminal markings
9.2 Power-frequency withstand tests on primary
windings and partial discharge measurement
9.3 Power-frequency withstand tests between sections
and on secondary windings
10 Special tests
10.1 Chopped impulse test on primary winding
10.2 Measurement of capacitance and dielectric
dissipation factor
10.3 Mechanical tests
10.4 Transmitted overvoltage measurement
11 Markings
11.1 Rating plate markings
11.2 Terminal markings
12 Accuracy requirements for single-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 tests for accuracy of measuring voltage
transformers
12.4 Routine tests for accuracy of measuring voltage
transformers
12.5 Marking of the rating plate of a measuring voltage
transformer
13 Additional requirements for single-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 tests for protective voltage transformers
13.7 Routine tests for protective voltage transformers
13.8 Marking of the rating plate of a protective
voltage transformer
Annex ZA (normative) - Normative references to international
publications with their corresponding
European publications
Figures
Tables