Symptoms (analysis)
The specific symptom of the “Water in the transformer (paper and oil)” criticality is related to the presence of the following diagnostic indicators with typical values not compliant with those recommended by the IEC 60422 standard:
Water in oil (IEC 60814)
To these are added diagnostic indicators derived from insulating paper analysis (following any internal inspection and sampling):
DP, degree of polymerisation (IEC 450:1974)
Water in papers (IEC 60814)
There are also co-factors useful to complete the diagnostic framework (resulting from the oil analysis):
Acidity TAN (IEC 62021-1)
Particles (IEC 60970)
To avoid interference in the matric and avoid overestimates, Sea Marconi has developed and uses use the sample preparation systemin a controlled atmosphere with vial on the revolving table (designed and marketed by Sea Marconi), analysed automatically using the Karl Fisher method (read more))
