What tests are done on transformer oil?
What tests are done on transformer oil?
Different Kinds of Transformer Oil Testing
- Visual Examination.
- Color Analysis.
- Dielectric Breakdown Voltage (BDV Test)
- Dissolved Gas Analysis (DGA Test)
- Dissolved Metals.
- Flash Point or Fire Point.
- Interfacial Tension.
- Furanic Compound.
Why transformer oil testing is required?
Transformer oil use growing globally Over time this oil is exposed to mechanical and electrical stress as well as to chemical contamination. To maintain and extend the life of the power transformer and to avoid severe breakdowns, regular testing of the transformer oil is very important.
What is frequency of transformer oil testing?
Routine testing of transformer oils and insulating oils on a regular schedule is an accepted industry practice. General and physical tests are suggested twice a year, dissolved gas analysis once a year, and Furan testing every 2 years for transformers in operation at least 5 years.
What is BDV value of transformer oil?
That means at which voltage dielectric strength of transformer oil between the electrodes has been broken down. A typical value of BDV Test result for 220 / 6.6 kV Transformer oil is 65 kV and moisture content should be less than 10 ppm.
What is PPM test in transformer?
PPM stands for Parts Per Million. It is used to measure the weight of moisture divided by the value of oil. The moisture content in oil lowers the insulating system dielectric strength that permits flashover to harm a transformer. For example, for mineral oil, a generally accepted maximum moisture content is 35 ppm.
What is BDV test in transformer?
BDV test means the Breakdown Voltage Test. This test is performed for verifying the dielectric strength of the oil of the transformer. Dielectric Strength is the maximum capacity to resist the voltage of insulating oil. This test demonstrates the dielectric Strength of Transformer Oil.
What is Rogers ratio?
Rogers Ratio Method compares quantities of different key gases by dividing one into the other. This gives a ratio of the amount of one key gas to another. Rogers used these relationships and determined that if a certain ratio existed, then a specific temperature had been reached.
Why is nitrogen used in transformers?
To put out the fire in a transformer, were it to occur, we can reduce the oxygen level by displacing it with nitrogen gas. The nitrogen pressure in the transformer also helps to reduce the top oil pressure and temperature which is critical for preventing an explosion.
