Which test are 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 is BDV test?
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 resistivity of transformer oil?
That is why specific resistance or resistivity of transformer oil should get measured at 27ºC and 90ºC. The minimum standard specific resistance of transformer oil at 90ºC is 35 × 1012 ohm-cm, and at 27ºC, it is 1500 × 1012 ohm-cm.
What is OTD test?
The Oil Tan Delta (OTD) is a laboratory instrument, which measures the Tan Delta, Resistivity and Relative Permittivity of insulating liquids. These tests give a wider picture of the overall quality of the insulating oil, and will indicate if there is any contamination.
What is tan delta test?
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.
How is oil tested?
By passing infrared radiation through your oil sample and examining the output, a surprisingly thorough analysis can be made of the oil’s chemical makeup. This allows us to determine how much water, soot, fuel, or other contaminants are in your system.
What is BDV value 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.
What is BDV value of transformer?
Dielectric Strength 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. A low value of BDV indicates presence of moisture content and conducting substances in the oil.
What is OTDR testing?
What is an OTDR? It is a fiber optic instrument used to characterize, troubleshoot and maintain optical telecommunication networks. OTDR testing is performed by transmitting and analyzing pulsed laser light traveling through an optical fiber.
What does OTDR stand for?
optical time domain reflectometer
An optical time domain reflectometer (OTDR) is a device used to precisely detect faults in an optical fiber link of a communication network. Its function includes generation and transmission of a series of high-speed optical pluses within the fiber.
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.
How to make soil resistivity test?
The outer two pins are called the Current probes,C1 and C2.
How to check soil resistivity?
Composition of the soil (e.g.
How to measure the soil resistivity?
– ρE > 100 Ωm: slightly corrosive – 50 < ρE < 100 Ωm: moderately corrosive – 10 < ρE < 50 Ωm: corrosive – ρE < 10 Ωm: severe
What can soil testing do well?
If it’s a sticky lump that won’t easily break apart,you have a lot of clay.