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Economical Goals of Life-extending Maintenance

6. Costs of transformer "detoxication"

The reclamation & desludging costs can strongly vary with local conditions and with the type and size of the transformer.

Economical Goals: Table E6
Method Advantages Draw-backs Costs: € / kg oil
Change of oil inventory
NN < 0.1
  • Classical quick method
  • Auxiliary technologies necessary (high powered drying & degassing device,tanks..)
  • new oil inventory is partially contaminated with the rest of the aged oil from the cellulose
ca 0.8 - 1.-
Reclamation of oil inventory NN < 0.3
Short -term by-pass process
  • No auxiliary technology necessary
  • cellulose partial wash-up
  • 1 - 4 days by size of transformer *
0.5 - 0.8 .-
Reclamation of oil inventory & desludging
long -term by-pass process
NN < 0.5
  • No auxiliary technology necessary
  • medium cellulose wash up
  • 2 - 8 days by size of transformer *
ca 0.8 - 1.-
Reclamation of oil inventory & radical desludging
long-term by-pass process
NN > 0.5
  • No auxiliary technology necessary
  • radical cellulose wash up
  • high temp.and intensive troughflow desludging
  • 2 - 10 days by size of transformer *
ca 1 - 2.-

* valid for an ca 40 MVA-transformer, 13 m3 oil, reclamation apparatus with oil throughflow min. 4 m3 / hour

Read next: 7. Saving/ cost relation by different replacement strategies