What made transformer oil unsuitable for further use

MENTION FOUR (4) CAUSES THAT RENDER TRANSFORMER OIL UNSUITABLE FOR FURTHER USE [4

  1. Low electric strength – may result from many causes, the most common is foreign particles on fiber and water in combination.
  2. High acidity
  3. High sludge content
  4. Excessive free water content – presence of moisture can be detected with oil dryness test set.

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