BDV VALUE OF TRANSFORMER OIL PDF

BDV stands for Breakdown Voltage. It is also called as dielectric strength value. It is the dielectric strength of transformer oil. If the value of BDV is higher then it indicates that the presence of contaminants is lower. The minimum value of breakdown voltage is 30 kV kV.

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Motor Power System Power Quality. The transformer oil is used in the transformer for insulation as well as for cooling purpose.

The different insulating materials have different dielectric strength. The insulating material should sustain the voltage up to its dielectric strength. If the voltage is increased above the specified dielectric strength of the insulating material, the current starts flowing through it and eventually the material get permanently punctured. The transformer oil is hygroscopic in nature i. The dielectric strength of the oil gets deteriorated with the absorption of the moisture.

Core and winding of the power transformer is submerged in transformer oil. The heat generated inside the transformer due to iron loss and copper loss needs to be dissipated outside of the transformer to limit the temperature to its safe limit.

The heat generated inside the transformer is transferred to oil and the oil transfers the heat to the outer tank body and, the temperature is dissipated in the atmospheric air.

The quality of the transformer oil has utmost importance for reliable operation of oil filled transformer. The one very important parameter - Dielectric strength or breakdown voltage BDV of the oil must be periodically checked to ensure trouble-free operation of the transformer. The dielectric breakdown voltage test is a quick and easy way of determining the contamination in the transformer oil.

The water is the major contaminant however, other contaminants like conductive particles,dirt,debris,insulating particles and by product of oxidation and aging of the transformer oil can deteriorate the dielectric strength of the mineral insulating transformer oil. The BDV tester has two electrodes separated by 2.

Repeat the step No. Take the average of BDV values observed in step 7 and 8. The water is the major contaminant in transformer oil. Aging by-products such as acids also deliver charge carriers through dissociation. Additionally they are surface-active, decreasing the surface tension. Thus they support bubble evolution following into a decreased dielectric strength. Pressure influences bubble evolution too. With increasing pressure the breakdown voltage increases.

For pressures below the atmospheric pressure the breakdown voltage should decreases. Oil , transformer. Unknown February 16, at AM. Newer Post Older Post Home. Subscribe to: Post Comments Atom.

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BDV Test in Transformer

Motor Power System Power Quality. The transformer oil is used in the transformer for insulation as well as for cooling purpose. The different insulating materials have different dielectric strength. The insulating material should sustain the voltage up to its dielectric strength. If the voltage is increased above the specified dielectric strength of the insulating material, the current starts flowing through it and eventually the material get permanently punctured. The transformer oil is hygroscopic in nature i. The dielectric strength of the oil gets deteriorated with the absorption of the moisture.

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Transformer Oil BDV Test

It is done for checking the dielectric strength of the oil of the Transformer. Dielectric strength means the maximum capacity to withstand voltage of insulating oil. This test shows the dielectric strength of Transformer oil. While taking sample of oil from transformer, Sample bottle should be flushed well by Transformer oil and oil in Sample bottle should be vented properly so that atmospheric moisture could not ingress in the sample oil. A typical way of taking oil sample in Sample Bottle is shown in figure below. Now slowly rising voltage is applied between the electrodes.

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Breakdown Voltage (BDV) in transformer oil

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