What tests are performed for 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.
Is standard for transformer oil testing?
The most commonly performed test is ASTM D-877, and because of this, it is more readily used as a benchmark value when comparing different results. The oil sample is placed in a test cup and an AC voltage is impressed on it.
Why testing of oil is carried out before using a transformer?
Over time this oil is exposed to mechanical and electrical stress as well as to chemical contamination. When the functionality is reduced it can lead to power outages. 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 oil is used in power transformers?
Naphthenic mineral oil
Naphthenic mineral oil has long been the most preferred insulating liquid for power transformer insulation because it has a good pouring point at low temperatures, good thermal cooling capacity, low cost, high efficiency and availability on the transformers market [1, 2, 3, 7].
How do you test a transformer?
To test your transformer, simply touch the red and black pins of your ohmmeter to the opposite ends of the transformer’s wiring. Read the display and compare the resistance on your ohmmeter to the resistance stated on the transformer’s data sheet. This is sometimes listed on the transformer’s enclosure.
What is transformer BDV test of 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. This test demonstrates the dielectric Strength of Transformer Oil.
What kind of fluid is in transformers?
mineral oil
Today, most transformers are filled with mineral oil. This has been the case since the late 19th century, when chemist Elihu Thomson, whose company later merged to form General Electric, patented the use of mineral oil in transformers to help disperse heat from the core of a transformer in order to prolong its life.
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.
How do you test transformers?
What types of Transformers do our oil and fluid tests target?
Our oil test packages target every condition for every type of transformer. Fluid test packages are offered for both mineral-oil-filled and alternative-fluid-filled transformers including askarel, natural and synthetic esters, silicone and Wecosol. Mineral Oil Filled Equipment
What type of test packages are offered for Transformers?
Fluid test packages are offered for both mineral-oil-filled and alternative-fluid-filled transformers including askarel, natural and synthetic esters, silicone and Wecosol. Mineral Oil Filled Equipment CriticalPac Oil Screen Package (OS) Dissolved Gas Analysis (DGA)
What is the D877 test for transformer oil?
D877 use has been reexamined by many of the standards organizations (IEEE has virtually eliminated it as a test for transformer oil in the draft revision of the acceptance and maintenance guide for mineral oil), but the test is still useful enough to justify its inclusion in both a program for accepting new oil and for evaluating oil in service.
What is the specific gravity of transformer oil?
Relative density (more commonly, specific gravity) is a direct comparison of the density (mass per volume) of an insulating liquid to water. Water has a specific gravity of 1.000; transformer oil is lighter than water, so the specific gravity is less than one.