IEC/IEEE 62582-5:2015

Nuclear power plants - Instrumentation and control important to safety - Electrical equipment condition monitoring methods - Part 5: Optical time domain reflectometry

IEC/IEEE 62582-5:2015 contains methods for monitoring the attenuation condition of optical fibres and cables in instrumentation and control systems using optical time domain reflectometer measurements in the detail necessary to produce accurate and reproducible measurements. It includes the requirements for the measurement system and conditions, and the reporting of the measurement results.

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

L'IEC/IEEE 62582-5:2015 présente des méthodes de surveillance du phénomène d'affaiblissement affectant les câbles à fibres optiques intégrés dans les systèmes d'instrumentation et de contrôle-commande en utilisant des techniques de rétrodiffusion, de façon suffisamment détaillée pour obtenir des mesures reproductibles et précises. Elle comprend des exigences concernant les systèmes de mesure et les conditions de mesure, ainsi que les rapports des résultats de mesure.

General Information

• Status: Published
• Publication Date: 18-Jun-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.120.20 - Nuclear power plants. Safety
• ICS: 31.200 - Integrated circuits. Microelectronics
• Technical Committee: SC 45A - Instrumentation, control and electrical power systems of nuclear facilities
• Drafting Committee: WG 10 - TC 45/SC 45A/WG 10
• Current Stage: PPUB - Publication issued
• Start Date: 30-Jun-2015
• Completion Date: 19-Jun-2015

Standards Content (Sample)

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

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