1 Scope
1.1 General
1.2 General block diagram of electronic current
transformers
1.3 General block diagram of electronic transformers
with a digital output
2 Normative references
3 Definitions
3.1 General definitions
3.2 Additional definitions for measuring electronic
current transformers
3.3 Additional definitions for protective electronic
current transformers
3.4 Additional definitions for digital output
3.5 Additional definitions for analogue voltage output
3.6 Index of main definitions and abbreviations
4 Normal and special service conditions
4.1 General
4.2 Normal service conditions
4.3 Special service conditions
4.4 System earthing
5 Ratings
5.1 General ratings
5.2 Standard values for rated phase offset
5.3 Rating for digital output
5.4 Ratings for analogue voltage output
6 Design requirements
6.1 General design requirements
6.2 Design requirements for digital output
6.3 Design requirements for analogue voltage
output
7 Classification of tests
7.1 General
7.2 Type tests
7.3 Routine tests
7.4 Special tests
8 Type test
8.1 Short-time current tests
8.2 Temperature-rise test
8.3 Impulse tests on primary terminals
8.4 Wet test for outdoor type electronic current
transformers
8.5 RIV tests
8.6 Transmitted overvoltage test
8.7 Low-voltage components voltage withstand test
8.8 EMC tests
8.9 Accuracy test
8.10 Additional accuracy tests for protective electronic
current transformers
8.11 Verification of the protection
8.12 Tightness tests
8.13 Vibration tests
8.14 Additional type test for digital output
9 Routine tests
9.1 Verification of terminal markings
9.2 Power-frequency withstand test on primary terminals
and partial discharge measurement
9.3 Power-frequency voltage withstand test for low-voltage
components
9.4 Accuracy tests
9.5 Tightness tests
9.6 Additional routine tests for digital output
9.7 Additional routine tests for analogue output
10 Special tests
10.1 Chopped lightning-impulse test on primary terminals
10.2 Measurement of capacitance and dielectric dissipation
factor
10.3 Mechanical tests
10.4 Tests for accuracy versus harmonics
10.5 Tests in accordance with the technology applied
11 Marking
11.1 Terminal marking - General rules
11.2 Rating plate markings
12 Additional requirements for measuring electronic current
transformers
12.1 Accuracy class designation
12.2 Limits of current error and phase error at rated
frequency
12.3 Accuracy requirements on harmonics
13 Additional requirements for protective electronic current
transformers
13.1 Accuracy classes
13.2 Accuracy requirements on harmonics
14 Information to be given with enquiries, tenders and orders
14.1 Designation
14.2 Dependability
15 Rules for transport, storage and installation
15.1 Conditions during transport, storage and installation
15.2 Installation
15.3 Unpacking and lifting
15.4 Assembly
15.5 Operation
15.6 Maintenance
16 Safety
16.1 Electrical aspects
16.2 Mechanical aspects
16.3 Thermal aspects
Annex A (informative) Transient performance of ECTs
Annex B (informative) Technical information for electronic
current transformers with digital output
Annex C (informative) Technical information for electronic
current transformers with analogue output
Annex D (normative) Frequency response and accuracy requirements
on harmonics for electronic current and voltage
transformer
Annex E (informative) Graph explaining the accuracy requirements
Annex ZA (normative) Normative references to international
publications with their corresponding European
publications
Bibliography