During operating oil-immersed transformers, users have to take the oil sample for some different oil tests to determine different physical, chemical, and electrical characteristics of the transformer oil.
The basic procedures of taking oil from an oil-immersed transformer are given in the following points:
- Make sure that sampling is done by well-experienced technical personnel.
- Take at least 1 to 2 liters of oil from the oil sample valve or bottom valve (if available) depending upon the tests to be performed.
- Use dry and clean containers preferably made of amber-colored glass or seamless stainless-steel bottles or clear glass. Besides, plastic bottles also can be used.
- Fill the bottle slowly and gently up to 95% of its capacity and allow the oil to flow against the wall of the bottle to avoid any presentation of air bubbles in the oil. And then, we carefully close the bottle.
- Avoid any adhesive tape-like thing on the cover.
10. If the oil sample is collected in a clear glass bottle, It should be kept in a dark place.
1500 kva oil filled transformer