Foreword
1 General
   1.1 Scope
   1.2 Normative references
2 Definitions
   2.1 General definitions
   2.2 Additional definitions for measuring
        current transformers
   2.3 Additional definitions for protective
        current transformers
3 Normal and special service conditions
   3.1 Normal service conditions
   3.2 Special service conditions
   3.3 System earthing
4 Ratings
   4.1 Standard values of rated primary currents
   4.2 Standard values of rated secondary currents
   4.3 Rated continuous thermal current
   4.4 Standard values of rated output
   4.5 Short-time current ratings
   4.6 Limits of temperature rise
5 Design requirements
   5.1 Insulation requirements
   5.2 Mechanical requirements
6 Classification of tests
   6.1 Type tests
   6.2 Routine tests
   6.3 Special tests
7 Type tests
   7.1 Short-time current tests
   7.2 Temperature-rise test
   7.3 Impulse tests on primary winding
   7.4 Wet test for outdoor type transformers
   7.5 Radio interference voltage measurements
8 Routine tests
   8.1 Verification of terminal markings
   8.2 Power-frequency withstand tests on primary
        windings and partial discharge measurement
   8.3 Power-frequency withstand tests between
        sections of primary and secondary windings
        and on secondary windings
   8.4 Inter-turn overvoltage test
9 Special tests
   9.1 Chopped impulse test on primary winding
   9.2 Measurement of capacitance and dielectric
        dissipation factor
   9.3 Mechanical tests
   9.4 Transmitted overvoltages measurement
10 Markings
   10.1 Terminal markings - General rules
   10.2 Rating plate markings
11 Additional requirements for measuring current
   transformers
   11.1 Accuracy class designation for measuring
        current transformers
   11.2 Limits of current error and phase
        displacement for measuring current
        transformers
   11.3 Extended current ratings
   11.4 Type tests for accuracy of measuring
        current transformers
   11.5 Routine tests for accuracy of measuring
        current transformers
   11.6 Instrument security current
   11.7 Marking of the rating plate of a
        measuring current transformer
12 Additional requirements for protective current
   transformers
   12.1 Standard accuracy limit factors
   12.2 Accuracy classes for protective current
        transformer
   12.3 Limits of errors for protective current
        transformers
   12.4 Type and routine tests for current error
        and phase displacement of protective
        current transformers
   12.5 Type tests for composite error
   12.6 Routine tests for composite error
   12.7 Marking of the rating plate of a
        protective current transformer
13 Additional requirements for class PR protective
   current transformers
   13.1 Standard accuracy limit factors
   13.2 Accuracy classes for class PR protective
        current transformers
   13.3 Limits or error for class PR protective
        current transformers
   13.4 Type and routine tests for current error
        and phase displacement of class PR
        protective current transformers
   13.5 Marking of rating plate of class PR current
        transformers
14 Additional requirements for class PX protective
   current transformers
   14.1 Specification of performance for class
        PX protective current transformers
   14.2 Insulation requirements for class PX
        protective current transformers
   14.3 Type tests for class PX protective current
        transformers
   14.4 Routine tests for class PX protective
        current transformers
   14.5 Marking of rating plate of class
        PX current transformers
Annex A (normative) - Protective current transformers
Annex B (informative) - Multiple chopped impulse test
Annex ZA (normative) - Normative references to
                        international publications
                        with their corresponding
                        European publications
Figures
Tables