What oil is used in transformers?
Mineral oil
Mineral oil and Synthetic oil are the majorly used transformer oil. These are the petroleum products, like Naphthenic based transformer oil and Paraffinic based transformer oil. Naphthenic based transformer oils are known for their heat distribution, which is one of the main problems with transformer.
What are the different methods of filtration of transformer oil?
There are 2 ways to eliminate dirt in the transformer oil. Insulating oil filtration by filter candles can be classified by using classical edge filter or depth type filter. However, new advancements were made in which transformer oil filtration machines use filter cartridges instead of edge type paper filters.
How does oil work in a transformer?
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.
How often should transformer oil be filtered?
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.
What is Type 2 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 BDV 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. This test demonstrates the dielectric Strength of Transformer Oil.
What is the 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 process of oil filtration?
Filtration is a partial removal of solid particles through filter medium. Oil filtration systems generally use a multistage filtration with coarse and fine filters. Centrifugation is separation of oil and water, or oil and solid particles by centrifugal forces. Vacuum treatment degasses and dehydrates industrial oil.
What are the ingredients in transformer oil?
Transformer mineral oil contains a mixture of different hydrocarbons but is generally composed of three main components: alkanes, cycloalkanes and aromatic hydrocarbons.
What are the 3 types of transformers?
Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers.
What is BDV test in transformer?
What is the BDV value of transformer?
As per IEC, the minimum BDV of transformer oil should be 30 KV as per transformer oil BDV test standard. The transformer oil is used in the transformer for insulation as well as for cooling purpose.
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 the BDV value of 11kv transformer oil?
30 KV
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 the BDV of 11 KV transformer?
What is transformer oil filtration?
Transformer oil filtration is a process through which sludge, dissolved moisture, and gasses are removed to secure the oil’s quality and performance. Transformer oil is susceptible to degradation as time advances since it is exposed to acid, dust, and moisture.
What is the chemical formula of transformer oil?
The transformer oil used in India is paraffin based having long chains of hydrocarbon, with general chemical formula, C nH2n+2.
Why kVA rating is used in transformer?
As, the copper loss or I2R loss depends on the current and the iron or core loss depends upon the voltage of the transformer. Thus, the total losses in a transformer depend upon volt-ampere (VA) only and not on the power factor of the load. That is why the transformer rating is given in kVA and not in kW.
What is the kVA rating of a transformer?
1,000 volt-amperes
The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current.
What is OTI and WTI in transformer?
They are commonly referred to in the industry as Oil Temperature Indicators (OTI) and Winding Temperature Indicators (WTI). Electrical utilities often utilize oil and winding temperature indicators to provide alarm and control signals that are used to activate cooling control systems on a transformer.
What is OSR in transformer?
Oil Surge Relay-OSR is one of the auxiliary equipment of an oil-immersed type transformer. It is mainly used to limit the damage to the on-load tap changer in case of failure. OSR is placed in between OLTC(On Load Tap Changer) tank and OLTC conservator. Oil Surge Relay.
What is minimum BDV value of transformer oil?
30 kV
Dry and clean oil gives BDV results, better than the oil with moisture content and other conducting impurities. The minimum breakdown voltage of 11kV/433 V transformer oil or dielectric strength of transformer oil at which this oil can safely be used in transformer, is considered to be more than 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.
How do I convert kVA to kW?
kVA = kw / PF
PF = Power factor.
What is difference between KV and kVA?
KV = kilo volt, It always denotes a voltage value as electric voltage, EMF. Again KVA = kilo volt ampere, It denotes the value of power. As per the formula Power = current * voltage or P=VI .