IEC/IEEE 62582-5:2015

IEC/IEEE 62582-5 ®
Edition 1.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Instrumentation and control important to safety –
Electrical equipment condition monitoring methods –
Part 5: Optical time domain reflectometry

Centrales nucléaires de puissance – Instrumentation et contrôle-commande
importants pour la sûreté – Méthodes de surveillance de l'état des matériels
électriques –
Partie 5: Technique de rétrodiffusion

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IEC/IEEE 62582-5 ®
Edition 1.0 2015-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Nuclear power plants – Instrumentation and control important to safety –

Electrical equipment condition monitoring methods –

Part 5: Optical time domain reflectometry

Centrales nucléaires de puissance – Instrumentation et contrôle-commande

importants pour la sûreté – Méthodes de surveillance de l'état des matériels

électriques –
Partie 5: Technique de rétrodiffusion

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.120.20 ISBN 978-2-8322-2704-6

– 2 – IEC/IEEE 62582-5:2015
© IEC/IEEE 2015
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Abbreviations and acronyms . 10
5 General description . 10
6 Applicability and reproducibility . 10
7 OTDR measurements procedure . 11
7.1 General . 11
7.2 Instrumentation . 11
7.3 Measurement wavelengths . 12
7.4 Calibration . 12
7.5 Precautions for OTDR measurements . 12
7.6 Conditioning . 12
7.7 OTDR measurement . 13
7.8 Measurement errors . 15
7.9 Test report . 15
Annex A (informative) Factors affecting the measurement of attenuation in fibre optic
systems . 16
A.1 General . 16
A.2 Temperature and humidity . 16
A.3 Bending . 16
A.4 Transmission light power . 16
A.5 Connector interface . 16
Annex B (informative) Ageing and degradation of optical fibres in nuclear power plants . 17
B.1 Factors affecting ageing . 17
B.1.1 General . 17
B.1.2 Thermal ageing . 17
B.2 Ageing in ionising radiation . 18
B.2.1 General . 18
B.2.2 Increase of attenuation . 18
Annex C (informative) Guidance on selection of parameters for the measurement . 22
C.1 Selection of distance range . 22
C.2 Selection of pulse duration and definition of dead zone . 22
C.3 Selection of wavelength . 22
C.4 Selection and position of markers . 22
C.5 Selection of method for averaging . 24
C.6 Setting of the vertical and horizontal scale (v-zoom, h-zoom) . 24
C.7 Vertical and horizontal shifts . 24
C.8 Laser on/off . 25
C.9 Setting of IOR, group index . 25
C.10 Use of attenuator . 25
Bibliography . 26

© IEC/IEEE 2015
Figure 1 – Block functions of the OTDR . 12
Figure 2 – A typical OTDR waveform – Backscattered power vs distance (km) . 14
Figure 3 – Examples of faults . 14
Figure B.1 – A typical OTDR-trace . 17
Figure B.2 – RIA of different fibre types . 19
Figure B.3 – Example for RIA and its wavelength dependence of an optical fibre . 20
Figure C.1 – Markers for measuring attenuation . 23
Figure C.2 – Markers for measuring splice loss . 23
Figure C.3 – LSA and 2PA as approximation methods . 24
Figure C.4 – Fibre signature with the attenuator set at 0 dB and 5 dB, respectively . 25

– 4 – IEC/IEEE 62582-5:2015
© IEC/IEEE 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR POWER PLANTS –
INSTRUMENTATION AND CONTROL IMPORTANT TO SAFETY –
ELECTRICAL EQUIPMENT CONDITION MONITORING METHODS –

Part 5: Optical time domain reflectometry

FOREWORD
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