Transformer oil sampling is conducted by extracting a small amount of oil from the transformer, typically through a sampling valve or port. The process involves cleaning the sampling port to avoid contamination, collecting the oil in a clean, dry container, and then sealing and labeling the sample for analysis. Sampling is often done under specific conditions, such as when the transformer is at a stable temperature, to ensure accurate results.
The main difference between oil type and dry type transformers lies in their cooling and insulation methods:
Oil type transformers use insulating oil to cool and insulate their internal components. The oil circulates to dissipate heat and prevent electrical discharges.
Dry type transformers use air or other gases for cooling and insulation, without any liquid involved. They are typically safer in environments where fire risk is a concern and require less maintenance but may have lower cooling efficiency compared to oil type transformers.
The purpose of oil in a transformer is to insulate and cool the internal components. It prevents electrical discharges, dissipates heat generated during operation, and protects the transformer from moisture and oxidation, ensuring efficient and reliable performance.
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