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The DayCor corona detection
camera is ideal as a predictive maintenance tool
for the detection of arcing, corona emissions,
partial discharges on insulators, cables and
substations components. It proved to be
particularly effective when outages were occurring on a
power line during wet and foggy weather. In dry
conditions, flashover does not occur and corona
cannot be seen. In wet conditions, however, the
corona effect can be observed with a UV camera
before flashover occurs.
After inspection of the power
line with a UV camera, the problem was
identified as flashovers caused by a damaged
composite insulator, with a puncture upon the
live end. Upon closer inspection, the defective
insulator showed clear signs of carbonisation,
and in damp conditions, humidity started
penetrating the rod, causing boiling water
pressure. This resulted in prolonged corona
damage with arcing eventually cracking the
insulator. |
