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.
What is BDV value of transformer oil?
It is confirmed that the dielectric breakdown voltage of pure transformer oil is about 10 kV with a gap distance of 1 mm between electrodes.
Which oil is used in distribution transformer?
Mineral oil
Mineral oil and Synthetic oil are the majorly used transformer oil. These are the petroleum products, like Naphthenic based transformer oil and Paraffinic based transformer oil. Naphthenic based transformer oils are known for their heat distribution, which is one of the main problems with transformer.
How will you confirm that transformer oil is in good condition?
To assess the insulating property of dielectric transformer oil, a sample of the transformer oil is taken and its breakdown voltage is measured. A test voltage is applied to the electrodes and is continuously increased up to the breakdown voltage with a constant, standard-compliant slew rate of e.g. 2 kV/s.
What is tan delta test in transformer?
Tan Delta, also called Loss Angle or Dielectric Dissipation Factor (DDF) or Power Factor (PF) testing, is an electrical dielectric test on the insulating oil used to determine its quality. The test is performed at two temperatures.
Is standard for BDV test?
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 the ideal value of breakdown strength of transformer oil as per IS 30 kV per?
The minimum value of breakdown voltage is 30 kV-40 kV. It depends upon on the moisture present in transformer oil. If the moisture is higher then the breakdown voltage will be lower in transformer oil. It is an important parameter for transformer oil.
What are the qualities of good transformer oil?
Synthetic transformer oil like chlorinated diphenyl has excellent properties like chemical stability, non-oxidizing, good dielectric strength, moisture repellant, reduced risk due to fire and explosion.
How often should you test transformer oil?
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 crackle test of transformer oil?
The crackle test is a standard laboratory test to detect the presence of water in lubricating oil. A drop of oil is placed on a hotplate that has been heated to approximately 400° F. The sample then bubbles, spits, crackles or pops when moisture is present.
What is UST mode?
UST mode is used to measure insulation between two ungrounded terminals of the apparatus, isolate an individual section of insulation and test it without measuring other connected insulation.
Where can I get a transformer oil analysis in Ireland?
Here at T.E. Laboratories (TelLab) in Tullow, County Carlow, we operate Ireland’s only specialised transformer oil analysis laboratory, certified to ISO 9001:2015 standard s.
What is oil analysis of transformer?
Oil analysis is the internationally recognised approach to monitor the condition of high-voltage transformers. Just like a blood sample provides crucial information about a person’s health, regular sampling, analysis and trending of transformer oil provides a critical diagnosis of brewing problems within the transformer.
Which is the best transformer oil in India?
In India and several countries of the world, ELECTROL ® is today synonymous with the most trusted name in transformer oils. ELECTROL ® Transformer oils are mineral electrical insulating oils processed from super refined, carefully selected premium basestocks.
How to extend the life of the transformer oil?
Regular sampling and testing of insulation oil taken from transformers is a valuable technique in a preventative maintenance pr ogram. If a proactive approach is adopted based on the condition of the transformer oil, the life of the transformer can be extended.
