Which transformer oil is best?

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].

Which oil is used in transformers?

Mineral oils are still widely used in the industry. Mineral oil is generally effective as a transformer oil, but it has some disadvantages, one of which is its relatively low flashpoint versus some alternatives. If a transformer leaks mineral oil, it can potentially start a fire.

What are the two types of transformer oil used in a transformer?

There are two main types of transformer oil used today: Paraffin-based transformer oil and naphtha-based transformer oil. The mineral insulating oil is derived from particular crudes, which include extremely low n-paraffin known as wax.

What are the qualities of good transformer oil?

What is type II transformer oil?

Sunoco Type II Transformer Oil is a high quality oil that is fully inhibited for corrosion resistance in transformers and other oil filled electrical equipment. It is formulated with wax-free naphthenic base oil due to its outstanding dielectric strength.

What is name of Transformer Oil - Types of transformer oil - Electrical Interview Question

Why is mineral oil for transformer?

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].

Why is it called mineral oil?

Mineral oil is any of various colorless, odorless, light mixtures of higher alkanes from a mineral source, particularly a distillate of petroleum, as distinct from usually edible vegetable oils.

How many types of transformer oil are there?

Three basic types of transformer oil used are mineral oil (mostly naphthenic), silicone, and bio-based. Mineral oil based transformer oils dominate the consumption as it has good electrical and cooling properties, and provides cost-effective solution.

What is the Colour of transformer oil?

Generally, oil that is yellow, orange, or even somewhat red in color is fresher and will work as intended. As oil ages, it transforms to a brown or black color and its efficacy diminishes.

What is viscosity of transformer oil?

For example, the average value of transformer oil kinematic viscosity is (28-30)∙10-6 m2/s.

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 the BDV value of transformer?

As per IEC, the minimum breakdown voltage of transformer oil should be not less than 30 KV. The BDV of transformer oil does not depend on the voltage rating of the transformer. Minimum transformer BDV value for either 11 KV, 22 KV, 132 KV is the same. The minimum transformer oil BDV is 30 KV.

How do you check oil level in transformer?

To check the level indicator, remove the outside mechanism for testing without lowering transformer oil. After removing the gauge, hold a magnet on the back of the dial and rotate the magnet; the dial indicator should also rotate. If it fails to respond or if it drags or sticks, replace it.

Why Buchholz relay is used?

The Buchholz relay is used as a protective device sensitive to the effects of dielectric failure inside the equipment. A generic designation for this type of device is "gas detector relay".

Is transformer oil harmful?

Skin contact Skin irritation should not occur when used as recommended. Repeated exposure may cause skin dryness or cracking. Eye contact May cause temporary eye irritation. Acute and chronic health hazards Prolonged or repeated contact with used oil may cause serious skin diseases, such as dermatitis and skin cancer.

Which gas is used in transformer?

Typical gases that appear in transformers are hydrogen (H₂), methane (CH₄), ethane (C₂H₆), ethylene (C₂H₄), and acetylene (C₂H₂). These gases begin to form at specific temperatures and dissolve within the insulation oil of a power transformer, as shown in Figure 1.

What is IR test in transformer?

IR Value for Transformer. Insulation resistance tests are made to determine insulation resistance from individual windings to ground or between individual windings. Insulation resistance tests are commonly measured directly in megohms or may be calculated from measurements of applied voltage and leakage current.

Can transformer oil catch fire?

The temperature of the mineral oil inside the transformer tank increases, forming flammable vapour that is suddenly released from an opening in the tank into the surrounding atmosphere. Although the probability of transformer fires and explosions is relatively low, it is not negligible.

What is PCB transformer oil?

Polychlorinated biphenyls (PCBs) are persistent organic pollutants in insulating oil of a large number of transformers. A rapid and economical analytical method to detect PCB contamination is still required.

Why is silica gel used in transformers?

The main function of silica gel is to control the amount of moisture available within a breather transformer. They are used to prevent any extra moisture from entering the transformer which may bring forth many unnecessary damaging effects to the transformer.

When should I change the oil in my transformer?

Annually for 132 KV transformer, once in 2 years for the transformer below 132 KV transformer and in 2 years interval for the transformer above 132 KV transformer. It helps to analyze the gases which are present in the transformer oil.

Is mineral oil Harmful?

Many articles on the internet claim that mineral oil may negatively affect your health. However, mineral oil is FDA-approved for topical use in cosmetics, and there's no evidence that it's unsafe. Research has also deemed it safe to use.

What is the other name of mineral oil?

They can be found under names such as MINERAL OIL, PARAFFINUM LIQUIDUM, PETROLATUM, CERA MICROCRISTALLINA, MICROCRYSTALLINE WAX, OZOKERITE, CERESINE ISOPARAFFIN, PARAFFIN and SYNTHETIC WAX.

Can you eat mineral oil?

Adults can take 15 to 45 ml of mineral oil orally. These numbers will vary depending on the product. Ask your doctor about what dose is appropriate for you. Like other laxatives, mineral oil is meant to provide short-term relief.