BS 7816-3:1998

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.