AdministratorWhich test is used for insulating oil?
A table of the most common ASTM insulating oil tests and the significance of each.
| Test Type | ASTM Method | Units |
|---|---|---|
| Dielectric breakdown voltage | D877 | kV |
| Dissolved gas analysis (DGA) | D3612 | ppm |
| Dissolved metals | D7151 | µm |
| Flash point, fire point | D92 | °C |
What are the different tests performed on insulating oil of transformer?
The “screen test” is a collection of physical, electrical and chemical tests for the transformer oil. These tests include dielectric breakdown, power factor, interfacial tension, acidity, and color. A larger quantity of oil is needed for these tests.
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.
What is the BDV value for 33KV transformer?
Hai, BDV of a transformer oil used in 33KV/11kv the minimum value is 30Kv/mm,but as per my practical observations on different types of transformers oils ,before filtration and after filtration of oil the BDV is like this.
What is the distance between the BDV test set electrodes?
The electrode gap was set at 2.50 ± 0.05 mm.
What are the tests for insulating oil?
Tests that are concerned with the immediate condition and acceptability of the insulating oil include dielectric breakdown tests, moisture measurement by the Karl Fischer (KF) method, and dielectric dissipation factor.
What are the properties of insulating oil?
As an insulating liquid, oil’s most important property is a high dielectric strength and as a cooling liquid, a low viscosity is paramount. The principal nemeses of insulating oil are oxidation, contamination (particularly moisture, which tends to lower the dielectric properties of insulating oil), and excessive temperature.
How do you measure degradation in insulation oil?
Determines the presence of degradation in cellulosic materials such as paper, pressboard, and cotton, which generate furanic compounds in the insulating oil. Measurements are made using high-performance liquid chromatography (HPLC). Measured in parts per million (ppm) using the weight of moisture divided by the weight of oil.
How often should insulating oil be tested?
At all stages of a power asset’s life, testing must be conducted to evaluate the condition of the insulating oil. In fact, for some assets, it can be argued that the oil is tested more frequently than any other component.