Findings
The Intense corona on the end fitting of the live end corona seems to be in contact with the rubber in the end fitting.

Analysis
The reason for this problem could be a damaged end fitting or could be that the corona ring size is not sufficient for this specific configuration, and it attacked the end fitting . It seems that corona rings (280 mm) on the Sediver insulators are too small, the 280 mm diameter used corona ring seems to be not suitable for this configuration (horizontal). Please note that the CeramTec AG insulators are longer and have a larger corona ring (350 mm diameter rather than 280 mm).

Effect on reliability
If the end fitting of the polimeric insulator is exposed to a prolong corona activity it might be damaged. If the rod is exposed or is overheated, an electrical or mechanical failure of the rod is impending. If the end fitting is damaged a flash over or line drop might occur

Reccommendations
Remove one of the insulators or some of them and check the insulator for damage (mechanical damage, cracks in the polymer, burning of the end fitting sealing etc.) if there is a signed for damage then Priority replacement

Action Taken

Findings
Contamination on the wire

Analysis
No action is required if the Contamination on the conductor only

Effect on reliability
No action is required unless there is an RI/TVI/AN compliant

Reccommendations

Action Taken
NO

Please see similar case

Findings
Contamination on the wire

Analysis
See Tower 156

Effect on reliability

Reccommendations

Action Taken
NO