What are Passivators?
Passivators are metal deactivators that bind with certain reactive metal surfaces to retard or delay attack by corrosive sulfur. Passivators act by blocking the sites for corrosive sulfur compounds to attack the cop- per and form copper sulfide.
What is oil passivation?
Oil additivation with metal passivators – passivation This operation consists of adding a passivating additive (ToluilTriazolAmmina or Ciba-Irgamet 39 or NyPass) to the corrosive oil present in the transformer with the aim of protecting copper surfaces from attack by corrosive compounds such as DBDS.
What is ppm in transformer oil?
PPM stands for Parts Per Million. It is used to measure the weight of moisture divided by the value of oil. The moisture content in oil lowers the insulating system dielectric strength that permits flashover to harm a transformer. For example, for mineral oil, a generally accepted maximum moisture content is 35 ppm.
What is chemical used in transformer oil?
Polychlorinated biphenyls are a man-made substance first synthesized over a century ago and found to have desirable properties that led to their widespread use. Polychlorinated biphenyls (PCBs) were formerly used as transformer oil, since they have high dielectric strength and are not flammable.
What is the purpose of passivation?
The passivation process is a method of improving the corrosion resistance of stainless steel parts by removing ferrous contaminants like free iron from their surface, restoring them to their original corrosion specifications.
What is the BDV value of 11kv transformer oil?
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.
What is BDV value?
BDV (Breakdown Voltage Test): Breakdown Voltage is measured by observing at what voltage, sparking straits between two electrodes emerged in the oil, separated by specific gap. Low value of BDV indicates presence of moisture content and conducting substances in the oil.
Which type of silica gel is used in transformer?
Blue indicating silica gel
Usually, the type of silica gel used in breather transformers is Blue indicating silica gel, which consists of a chemical compound called cobalt chloride that gives it its blue color.
What is colour of silica gel in transformer?
The three most commonly available colors for silica gel are white, blue indicating and orange indicating. Indicating silica gels are processed with moisture indicators that change color to show when the product is saturated and needs to be regenerated.
What is the process of passivation?
What is the distance between two electrodes in a BDV kit?
The AC BDV test of RBDPO was performed whereby the distance between 2 electrodes was set to 1 mm.