What Is PCB Transformer Oil?

What is BDV test of transformer oil?

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 makes PCBs toxic?

According to the U.S. Environmental Protection Agency (EPA), PCBs cause cancer in animals and are probable human carcinogens. Many rivers and buildings, including schools, parks, and other sites, are contaminated with PCBs and there has been contamination of food supplies with the substances.

What are PCB in transformers?

Polychlorinated biphenyls (PCBs) are a group of manmade chemicals. They are oily liquids or solids, clear to yellow in color, with no smell or taste. PCBs are very stable mixtures that are resistant to extreme temperature and pressure. PCBs were used widely in electrical equipment like capacitors and transformers.

What are PCBs and why are they harmful?

PCBs, or polychlorinated biphenyls, are highly toxic industrial compounds. They pose serious health risks to fetuses, babies and children, who may suffer developmental and neurological problems from prolonged or repeated exposure to small amounts of PCBs. These chemicals are harmful to adults as well.

What is the use of transformer oil?

Transformer oil is a mineral based oil that is commonly used in transformers for its chemical properties and dielectric strength. This oil in your transformer acts as an insulator and a cooling agent. Over time, the oil will degrade resulting in the potential for faults and costly repairs.

Are PCBs still used today?

Commercial Uses for PCBs Although no longer commercially produced in the United States, PCBs may be present in products and materials produced before the 1979 PCB ban. Products that may contain PCBs include: Transformers and capacitors.

What is the standard BDV value of transformer oil?

That means at which voltage dielectric strength of transformer oil between the electrodes has been broken down. 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.

What is a safe level of PCB?

EPA requires that PCB spills or accidental releases into the environment of 1 pound or more be reported to EPA [ATSDR 2000]. FDA mandates tolerances of 0.2-3.0 ppm PCBs for all foods, with a tolerance level in fish of 2 ppm. FDA also limits PCBs in paper food-packaging materials to 10 ppm [FDA 1996c].

Who PCB congener list?

PCB congener listCP0 / CP1. These 68 coplanar congeners fall into one of two groups. … 4CL. These 169 congeners have a total of four or more chlorine substituents, regardless of position.PP. These 54 congeners have both para positions chlorinated.2M. These 140 congeners have two or more of the meta positions chlorinated.

How much oil does a transformer take?

1-2. 33kV – 400/230VItemCapacityOilkVALiter1501652100230316028011 more rows

What foods contain PCBs?

Most people are exposed to PCBs by eating contaminated fish, meat, and dairy products. Some bottom-feeding, freshwater fish may eat sediments containing PCBs while scavenging. Catfish, buffalo, and carp usually have the highest PCB levels.

Does transformer have oil?

Transformer oil or insulating oil is an oil that is stable at high temperatures and has excellent electrical insulating properties. It is used in oil-filled transformers, some types of high-voltage capacitors, fluorescent lamp ballasts, and some types of high-voltage switches and circuit breakers.

How do I remove PCBs?

Treatment options are available to remove PCBs from well water. The most commonly used is called granular activated carbon filtration. Options include central treatment (at the well or entry to home) or a point-of-use device (kitchen sink filter).

Is the oil in a transformer toxic?

The main constituent of transformer oil is polychlorinated biphenyl (PCB) which is responsible for producing toxicity in humans. Chronic exposure with PCB may cause some toxicity such as hepatotoxicity and neurotoxicity.

Is PCB harmful to humans?

PCBs are a probable human carcinogen. Studies of PCBs in humans have found increased rates of melanomas, liver cancer, gall bladder cancer, biliary tract cancer, gastrointestinal tract cancer, and brain cancer, and may be linked to breast cancer.

How can you tell if a transformer has a PCB?

Some nameplates specify the brand of cooling liquid inside the transformer. If one of the brand names listed in Table 1 appears on the nameplate, the transformer contains PCBs.

Is living next to a transformer dangerous?

How close can I live or work near powerlines or other electrical sources? There is no established evidence that the exposure to magnetic fields from powerlines, substations, transformers or other electrical sources, regardless of the proximity, causes any health effects.

What is inside of a transformer?

Distribution transformers consist of a magnetic core made from laminations of sheet silicon steel (transformer steel) stacked and either glued together with resin or banded together with steel straps, with the primary and secondary wire windings wrapped around them.