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The type of cable and the nature of the most common defects within it will determine the most effective diagnostic method to apply.
Possible diagnostic methods include:- Dielectric spectroscopy (for water trees)
- Leakage current detection (for contamination, large defects in paper cables systems)
- Loss-factor measurement (for water trees and some other defects)
- PD tests (for many different types of defects, as long as they generate partial discharges)
o Off-line with an 0.1 Hz source
o Off-line with a 50 Hz source
o Off-line with an OWTS (Oscillating Wave Test System) source
o On-line
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Applying an effective diagnostic method will normally result in a recommendation, for instance immediate repair, repair within one year, repeat measurement after 1-2 years, or no further action needed.
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