Specifications

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10. What is the very important aspect to be observed while of conducting dielectric strength
test on transformer oil?
Part - C
Answer the following questions briefly (4 Marks)
1. What may be the reason for rise in temperature of transformer oil?
2. State the causes for the drop in oil bud in a transformer?
3. What is drying of transformer?
4. What are the precautions to be observed during the drying out process?
5. What are the different methods used for drying of transformer?
6. What is meant by purification of transformer oil. State its necessity.
7. What are different oil purifier commonly used?
8. What are the components of oil testing set?
9. What is meant by Break down value of oil?
10. What should be the BDV of oil under normal operating conditions?
11. State few reasons for failure of transformer?
12. State the reasons for fall in dielectric strength of transformer oil?
Part - D
Answer the following questions in one page level (10 Marks)
1. State the actions to be taken to rectify the problem of low insulation value?
2. Briefly explain, what is degreasing? How it is done?
3. State the remedial measures to be taken if transformer oil level falls?
4. What are desired qualities of good transformer oil?
5. State the precautions to be followed during testing of dielectric strength of transformer oil?
6. Briefly describe what are things to be done during overhauling of transformer?