Analysing Transformer Oil - How Often ?

[woodglass]

We have ten 11kV to 415V transformers at my place of work.

Can anyone suggest how often we should have the transformer oil analysed ?

We have had various suggestions from contractors, from anually to once every
eight years.

TIA,

woodglass

 

[John McLean]

We have ten 11kV to 415V transformers at my place of work.

Can anyone suggest how often we should have the transformer oil analysed ?

We have had various suggestions from contractors, from anually to once every
eight years.

TIA,

woodglass

As this is a relatively low cost operation, it should be done annually, by
drawing a sample in clean bottles from near the bottom of the tank (Drain
Cock). When I was involved in this operation, as a maintenance engineer in
the 70's, the company who we allocated the refiltering and replacement of
the oil, supplied the bottles and carried out the analysis free of charge.
We drew the samples.
Jaymack