Which factor reduces the breakdown strength of transformer oil?

Which factor reduces the breakdown strength of transformer oil?

The dielectric strength may be drastically reduced by water supply or increased amount of foreign particles. Pure transformer oil is usually free from water and mechanical impurities and its breakdown voltage is greater than 60 KV(kilowatt).

What should be the breakdown voltage of transformer oil?

Minimum breakdown voltage of transformer oil or dielectric strength of transformer oil at which this oil can safely be used in transformer, is considered as 30 KV.

What is breakdown voltage in transformer oil?

Breakdown voltage (dielectric strength) is one of the most important parameters of transformer oil. It is measured when the transformer is taken into use and typically monitored by sampling during its operational lifetime. Breakdown voltage is affected by several factors, such as moisture, particles, acidity, and pressure.

What are the factors affecting the breakdown voltage of a transformer?

Breakdown voltage is affected by several factors, such as moisture, particles, acidity, and pressure. Dielectric strength of transformer oil is mainly determined by the presence of fiber and water, so the mechanical impurities and water in such oils must be completely absent. The dielectric strength of the oil decreases with time.

How to test the oil of a transformer?

To test the oil sample, transformer oil is poured into a porcelain vessel in which two “disk electrodes,” one of 8mm diameter and one of 25mm diameter, are mounted. The distance between the electrodes is set at 2.5 mm. A vessel is filled with oil and set in an oil punch.

How to maintain dielectric strength of transformer insulating oil?

The best way to maintain the dielectric strength of transformer insulating oil is to initiate a well planned and executed preventive maintenance program utilizing the GlobeCore Service Life Extension Program that incorporates the GlobeCore Process to regenerate transformer oil.