transformer oil for different voltage level
transformer oil for different voltage level
(OP)
What is the difference in properties of transformer oil used for different voltage levels? For instance, oil used for 11kV and 400kV level.
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transformer oil for different voltage level
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RE: transformer oil for different voltage level
RE: transformer oil for different voltage level
RE: transformer oil for different voltage level
System owners with numerous small distribution transformers often allow their oil condition to deteriorate to a state far poorer than would be allowed by an operator of a large transformer. This is because in the former case the maintenance costs are relatively high, asset numbers are large, the individual asset value is relatively low and the business impact of losing a transformer is relatively low. For a large system or generator transformer the reverse of those four statements is normally true and the maintenance is much better.
RE: transformer oil for different voltage level
RE: transformer oil for different voltage level
RE: transformer oil for different voltage level
IEC on oil first came out in 1969 as IEC 296 ed1.0. After three editions,current standard is IEC60296ed4.0-2012. As per this standard there is only one grade of oil for all types of transformers.(pour point-40C) There is a low temperature switchgear oil with pour point -60C for switchgears. Oil can also be of three types depending on the amount of oxidation inhibitors added in to it. U grade (uninhibited when inhibitor <0.01%) Tgrade (trace inhibited with inhibitor content <0.08%) I grade(inhibited with inhibitor content of 0.08-0.4 %) There is also super grade oil recommended for high temperature service or for extended life. This is a super refined oil with minimum sulphur content but always inhibited(I grade) with better oxidation stability characteristics.This is preferred by some users for EHV Transformers,HV DC Transformers,Arc Furnace Transformers etc.
ASTM D 3487-2008 ed4.0 (first published in 1976)covers two grades-Type1.0 trace inhibited and Type 2 inhibited.It is significant that as per ASTM today there is only inhibited type oil.2008 edition also changed anniline point so that standard allows both naphthenic and paraffinic oils.Earlier editions was allowing only naphthenic type.
BDV and ppm is same for all grades of oil.