oil-immersed transformers FAQ

A: First, find out the cause. If it is caused by improper placement of the sealing gasket, just put the sealing gasket in the right place, press it evenly and tighten it.

A: Protects the Solid Insulation – The transformer oil protects the solid insulation (paper). This is by far the most important function of the oil. Once the integrity of the paper is gone, you really only have two options to bring the transformer back to a good reliable piece of equipment: replace or rewind it.

A: Oil leakage of oil-immersed transformers is generally caused by the following two reasons: one is sand holes in the castings or pores in the welds, and the other is poor sealing.

A: Typical transformers have around 10,000 gallons of oil, but this depends on the scale of the substation whether for residential or industrial power transmission.

A: In reality, transformers running at underload hampers its longevity and efficiency. When a transformer is not correctly sized, the underloaded condition would result in high harmonic currents. This may also cause heating of transformers. All of this sum up to cause poor performance of the transformer.

A: Moisture in a Transformer Moisture is a significant concern for power transformers and can lead to unexpected failure of equipment and unplanned outages. Excessive moisture in the oil of a transformer reduces the oil's dielectric strength. This introduces the opportunity for flashover and arcing.

A: Around 20-30 years The typical lifespan of an oil-immersed transformer is around 20-30 years, but some high-voltage models that are kept in pristine conditions can last 50 or 60 years! Most of the time, these transformers will outlast the career of the person who ordered or installed them.

A: Dry-type transformers use air as the cooling medium, while oil-immersed transformers use oil instead of air.

A: oil-immersed transformers are a type of electrical transformer that uses oil as both a cooling and insulating medium. They are commonly used in high-voltage power transmission and distribution systems, as well as in industrial and commercial applications.

A: Dry transformers are insulated with resin and cooled by natural air (large capacity dry transformers may be cooled by fans), while oil-immersed transformers are insulated by insulating oil, and the heat generated by the coil is transferred to the radiator (fin) of the transformer through the circulation of the insulating oil.

A: Insulation. The first function of oil-immersed transformer oil is insulation, and the insulation strength of transformer oil is much higher than that of air. The insulating material is soaked in oil, which can not only improve the insulation strength, but also protect it from the erosion of moisture.