What do you know about the Oil Immersed Transformer?

The oil Transformer is one of the most important equipment in the electricity supply and distribution system of industrial, mining and civil buildings. It could reduce the 6kV/10kV/35kV voltage to the 230/400V bus voltage used by the user.

Which models of Oil Immersed Transformers are available on the market?

What are the performance characteristics of the Oil Immersed Transformer?

How can oil leakage be prevented with Oil Immersed Transformers?

Which models of Oil Immersed Transformers are available on the market?

1. Non-closed oil Transformers: mainly S8, S9, S10 and other serial products widely used in industrial and mining enterprises, agriculture and civil buildings.

2. Capped oil Transformers: mainly S9, S9-M, S10-M and other serial products, which are mostly used in places with a lot of oil and chemical substances in the oil and chemical industry.

3. Sealed oil Transformers: mainly BS9, S9, S10, S11-MR, SH, SH12-M and other serial products located in different locations such as industrial and mining companies, agriculture, and civilian buildings.

In addition, there are various special Transformers for special applications. For example, high voltage Transformers for testing, Transformers for electric furnaces, Transformers for electric welding and Transformers for thyristor circuits as well as voltage converters and Transformers for measuring devices.

What are the performance characteristics of the Oil Immersed Transformer?

A. The low voltage windings of Oil Immersed Transformers generally have a cylindrical structure with copper foil around the shaft, with the exception of copper wires with low capacity; The high voltage winding has a multi-layered cylindrical structure to balance the amperage distribution of the windings and cause leakages. Meanwhile, it is famous for the high mechanical strength and strong short-circuit resistance.

B. The iron core and the winding are taken over with mounting measures. The mounting parts, such as the height of the device and the low voltage cable, are equipped with self-securing counter-nuts and the non-hanging structure, which resists the transport shocks.

C. The coil and the iron core are vacuum-drawn and the Transformer oil is vacuum filtered and oiled to minimize the moisture inside the Transformer.

D. The oil tank uses corrugated sheet which has the respiratory function to compensate for the volume change of the oil due to the temperature change, so that the product does not have an oil expansion device, which obviously reduces the height of the Transformer.

E. As the corrugated sheet replaces the oil expansion vessel, the Transformer oil is isolated from the outside environment, effectively preventing the penetration of oxygen and water.Since it may lead to the deterioration of the insulation performance.

F. Concluded from above five performance points, it is ensured that the Oil Immersed Transformer does not need to be changed during normal operation, which significantly reduces the maintenance costs of the Transformer.

How can oil leakage be prevented with Oil Immersed Transformers?

The Oil Immersed Transformer is filled with Transformer oil in the oil tank, the oil-resistant rubber parts are applied with pressure during assembly process and sealed by fastening elements. Lack of sealing is the main cause of oil leakage in the Transformer, therefore careful inspection should be taken during maintenance. To solve the loosing small screws after vibration, they should be tightened and the degree of suit should be adequate and uniform everywhere. At this point, when exchanging, the rubber parts that can be updated should ensure that their models and specifications are consistent and keep the sealing surface clean.

The use of Oil Immersed Transformers is also closely related to the quality of its products. If you need more information, please contact Zhejiang Zhegui Electric Co., Ltd.