How do you perform a BDV test?

For measuring BDV of transformer oil, portable BDV measuring kit is generally available at site. In this kit, oil is kept in a pot in which one pair of electrodes are fixed with a gap of 2.5 mm (in some kit it 4 mm) between them. Now slowly rising voltage is applied between the electrodes.

What is BDV in 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 is the standard BDV value of transformer oil?

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 the procedure of oil testing of transformer?

To assess the insulating property of dielectric transformer oil, a sample of the transformer oil is taken and its breakdown voltage is measured. The lower the resulting breakdown voltage, the poorer the quality of the transformer oil. The transformer oil is filled in the vessel of the testing device.

How do you do a breakdown voltage test?

Measuring breakdown voltage is done by applying an increasing reverse voltage to the device until a certain test current is reached that indicates that the device is in breakdown.

What is the BDV breakdown voltage of a 33kv transformer?

If you ask about BDV value oil it should be minimum 40kV, as per standards. But in India we maintain it to 50kV/60kV.

What is the size of test cell in BDV?

43 x 40 x 40 cm
Machine Technical Specification

Input Supply	220V±10% Volts AC, 50 Hz, single phase.
Relative Humidity	< 85% RH
Working Altitude	< 1500 meters.
Dimensions/weight (App)	43 x 40 x 40 cm. Net 42 kg.
Optional Accessories	Test cells: ‘TC-1’ or ‘TC-3’. Gap gauge: 2 mm.

What is minimum breakdown voltage?

The breakdown voltage of an insulator is the minimum voltage that causes a portion of an insulator to become electrically conductive. For diodes, the breakdown voltage is the minimum reverse voltage that makes the diode conduct appreciably in reverse. Some devices (such as TRIACs) also have a forward breakdown voltage.

What is breakdown voltage of transformer?

It is the dielectric strength of transformer oil. This can indicates the presence of contaminants. 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-40 kV.

What is transformer 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. This test demonstrates the dielectric Strength of Transformer Oil.