IEC 61757-4-3:2020

IEC 61757-4-3 ®
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic sensors –
Part 4-3: Electric current measurement – Polarimetric method

Capteurs fibroniques –
Partie 4-3: Mesure du courant électrique – Méthode polarimétrique

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IEC 61757-4-3 ®
Edition 1.0 2020-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fibre optic sensors –
Part 4-3: Electric current measurement – Polarimetric method

Capteurs fibroniques –
Partie 4-3: Mesure du courant électrique – Méthode polarimétrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.180.99 ISBN 978-2-8322-8729-3

– 2 – IEC 61757-4-3:2020 © IEC 2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Components of optical current sensor using polarimetric method . 10
4.1 General descriptions . 10
4.2 Classification of Faraday elements . 11
5 Characteristic test . 12
5.1 General information . 12
5.2 Output power of light source . 12
5.3 Input power of light detector . 13
5.4 I/O characteristics . 13
5.4.1 General . 13
5.4.2 Test method . 14
5.4.3 Test procedure . 16
5.4.4 Evaluation . 18
5.5 Warm-up time . 19
5.5.1 General . 19
5.5.2 Test method . 19
5.5.3 Evaluation . 19
5.6 Current conditions for obtaining each parameter . 19
5.7 Input parameter dependency . 20
5.7.1 Frequency characteristic . 20
5.7.2 Transient characteristic . 20
5.8 External environment dependency . 22
5.8.1 Steady state temperature characteristic test . 22
5.8.2 Transient temperature characteristic test . 25
5.8.3 External magnetic field test . 27
5.8.4 Conductor position test . 28
5.8.5 Vibration test . 29
Annex A (informative) Principle of optical current sensor . 30
A.1 Outline . 30
A.2 Faraday effect . 30
A.3 Types of Faraday element . 31
A.4 Conversion of the Faraday effect into an electric signal . 31
A.4.1 Detection of the Faraday effect of nonmagnetic material . 31
A.4.2 Detection of the Faraday effect of ferromagnetic material . 31
A.5 Current detection method . 32
A.5.1 General . 32
A.5.2 Examples of current detection method . 32
Annex B (informative)  Features of optical current sensor technology . 35
Annex C (informative)  Design considerations . 36
C.1 General information . 36
C.2 Performance restricting factors . 36
C.3 Procedure for determining the specifications of the equipment . 37

Annex D (informative)  Optical current sensor output in the application of other phase
magnetic fields. 39
D.1 Ampere's circulation integral law . 39
D.2 Influence of other phase magnetic fields . 39
Annex E (informative) Measurement parameter performance table . 41
E.1 General . 41
E.2 Output power of light source . 41
E.3 Input power of light detector . 41
E.4 I/O characteristics . 41
E.5 Frequency characteristics . 42
E.6 Transient characteristics . 43
E.7 Steady state temperature characteristics . 43
E.8 Transient temperature characteristics . 44
E.9 External magnetic field. 45
E.10 Conductor positions . 46
E.11 Vibration . 47
Bibliography . 48

Figure 1 – Measurement system using optical current sensor . 10
Figure 2 – Construction of optical current sensor . 11
Figure 3 – Classification of Faraday elements . 12
Figure 4 – Example of an optical power monitor . 13
Figure 5 – Example of the amplifying circuit of a light detector . 13
Figure 6 – I/O characteristics of an optical current sensor . 14
Figure 7 – Measurement system of waveform comparison method . 15
Figure 8 – Measurement system of AC bridge method . 16
Figure 9 – Transient characteristics of AC dedicated system . 21
Figure 10 – Transient characteristics of DC/AC system . 22
Figure 11 – Configuration example of steady s
...