EN IEC 61757-4-3:2020

SLOVENSKI STANDARD
01-november-2020
Optični senzorji - 4-3. del: Merjenje električnega toka - Polarimetrijska metoda (IEC
61757-4-3:2020)
Fibre optic sensors - Part 4-3: Electric current measurement - Polarimetric method (IEC
61757-4-3:2020)
Lichtwellenleitersensoren - Teil 4-3: Strommessung - Polarimetrisches Verfahren (IEC
61757-4-3:2020)
Capteurs fibroniques - Partie 4-3: Mesure du courant électrique - Méthode polarimétrique
(IEC 61757-4-3:2020)
Ta slovenski standard je istoveten z: EN IEC 61757-4-3:2020
ICS:
33.180.99 Druga oprema za optična Other fibre optic equipment
vlakna
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61757-4-3

NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2020
ICS 33.180.90
English Version
Fibre optic sensors - Part 4-3: Electric current measurement -
Polarimetric method
(IEC 61757-4-3:2020)
Capteurs fibroniques - Partie 4-3: Mesure du courant Lichtwellenleitersensoren - Teil 4-3: Strommessung -
électrique - Méthode polarimétrique Polarimetrisches Verfahren
(IEC 61757-4-3:2020) (IEC 61757-4-3:2020)
This European Standard was approved by CENELEC on 2020-09-03. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61757-4-3:2020 E

European foreword
The text of document 86C/1578/CDV, future edition 1 of IEC 61757-4-3, prepared by SC 86C "Fibre
optic systems and active devices" of IEC/TC 86 "Fibre optics" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 61757-4-3:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-06-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-09-03
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 61757-4-3:2020 was approved by CENELEC as a
European Standard without any modification.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 61757 - Fibre optic sensors - Generic specification EN IEC 61757 -

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

IEC 61757-4-3:2020 © IEC 2020 – 3 –
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 state temperature characteristic test and
transient tem
...