IEC 60044-8:2002

FOREWORD
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 Rating 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 tests 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 performances 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
Bibliography
Figures
Tables

This part of IEC 60044 applies to newly manufactured electronic current transformers having an analogue voltage output or a digital output, for use with electrical measuring instruments and electrical protective devices at nominal frequencies from 15 Hz to 100 Hz.