What is minimum BDV value of transformer oil?
30 KV
As per IEC, the minimum BDV of transformer oil should be 30 KV as per transformer oil BDV test standard. The transformer oil is used in the transformer for insulation as well as for cooling purpose. The different insulating materials have different dielectric strength.
What is BDV test of transformer oil?
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.
What is the BDV of transformer?
The dielectric strength of transformer oil is also known as the breakdown voltage (BDV) of transformer oil. Breakdown voltage is measured by observing at what voltage, sparking strands between two electrodes immersed in the oil, separated by a specific gap.
What is size of test cell in BDV?
Machine Technical Specification
| Input Supply | 220V±10% Volts AC, 50 Hz, single phase. |
|---|---|
| Test cell with Electrodes | Type ‘TC-2’: 36 mm mushroom electrodes. Type ‘TC-3’: 25 mm flat disc electrodes. Type ‘TC-1’: 13 mm round electrodes. |
| Gap Gauge | 2.5 mm |
| Printer | Built in printer for printing results on plain paper. |
What is minimum breakdown voltage?
The breakdown voltage of an insulator is the minimum voltage that causes a portion of an insulator to experience electrical breakdown and become electrically conductive.
What is DGA of transformer oil?
Dissolved gas analysis (DGA) is an examination of electrical transformer oil contaminants. Insulating materials within electrical equipment liberate gases as they slowly break down over time.
What is ppm in transformer oil?
As such, limits of 30 to 35 ppm of water in the transformer oil are generally referenced as acceptable standards. Ensuring that water content in the transformer oil remains low is an important consideration when ensuring the safe operation, aging, and reliability of a transformer.
What is the distance between the BDV test set electrodes?
The electrode gap was set at 2.50 ± 0.05 mm.
What is standard dielectric strength of oil?
It is therefore, important to keep the transformer oil as free from such contaminates as possible. The dielectric strength of the oil will decrease with time and based on the service conditions where the transformer is located. The dielectric strength of transformer oil is expected to be 33 kV.
Is standard for BDV of transformer oil?
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. BDV is an important and popular test of transformer oil, as it is the primary indicator of the health of oil and it can be easily carried out at the site.