Determination of long-term radiation ageing in polymers Procedures for in-service monitoring of low-voltage cable materials

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

07-15-1998

Publisher

British Standards Institution

INTRODUCTION
1 Scope
2 Requirements of a monitoring technique
3 Techniques available
    3.1 Local tests without sampling
          3.1.1 Indenter
          3.1.2 Sonic velocity
          3.1.2 Near infrared reflectance
          3.1.4 Torque tester
    3.2 Local tests with microsampling
          3.2.1 Infrared spectroscopy (IR)
          3.2.2 Oxidation induction time (OIT)
          3.2.3 Plasticizer content
          3.2.4 Density
    3.3 Global tests with spatial resolution
          3.3.1 Time domain reflectometry (TDR)
          3.3.2 Partial discharge (PD)
    3.4 Global tests without spatial resolution
          3.4.1 Time domain spectrometry (TDS)
          3.4.2 Dielectric loss
          3.4.3 Pass/fail tests
    3.5 Paced tests
4 Summary
Tables
Figures
Annex A (informative) Bibliography

Gives a summary of the main cable monitoring techniques currently being assessed worldwide. Mainly intended for monitoring of degradation of low-voltage cables.

This technical report summarizes the main cable monitoring techniques which are currently being assessed worldwide. These techniques are primarily aimed at monitoring degradation of low-voltage cables. Most of the methods are at the development stage and require in-plant evaluation before they could be recommended as standard techniques. The advantages and disadvantages of each method, and its current state of development, are outlined in the following sections. There are two aspects of cable monitoring that need to be taken into account – techniques suitable for ageing evaluation and techniques suitable for monitoring faults in cables. The methods discussed may, in some cases, be more suitable for monitoring faults than for evaluating the degree of degradation of the cable materials.

Committee	ISE/110
DevelopmentNote	Also numbered as IEC 61244-3 Supersedes 94/201928 DC (10/2005)
DocumentType	Standard
Pages	40
PublisherName	British Standards Institution
Status	Current
Supersedes	94/201928 DC : FEB 94

IEC 60544-4:2003	Electrical insulating materials - Determination of the effects of ionizing radiation - Part 4: Classification system for service in radiation environments
IEC 60505:2011	Evaluation and qualification of electrical insulation systems
IEC 60544-1:2013	Electrical insulating materials - Determination of the effects of ionizing radiation - Part 1: Radiation interaction and dosimetry
IEC 60544-2:2012	Electrical insulating materials - Determination of the effects of ionizing radiation on insulating materials - Part 2: Procedures for irradiation and test
IEC TS 61244-1:2014	Determination of long-term radiation ageing in polymers - Part 1: Techniques for monitoring diffusion-limited oxidation
IEC TS 61244-2:2014	Determination of long-term radiation ageing in polymers - Part 2: Procedures for predicting ageing at low dose rates

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BS 7816-3:1998

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