Oil Immersed Transformer

What is Oil Immersed Transformer?

Oil immersed transformers use insulating oil as the medium for insulation and cooling. The insulating oil covers the windings and the core, capable of absorbing the heat generated during the operation of the equipment. This heat is then dissipated into the air through natural convection or by means of fans. When used as the main transformer, a large-capacity transformer is usually of the oil immersed type.

Benefits of Oil Immersed Transformer1.Strong heat dissipation capability

Insulating oil has a high specific heat capacity, enabling it to absorb and store large amounts of heat. This ensures that heat generated during equipment operation is evenly dissipated, preventing overheating and its associated effects.

2.Strong insulation performance

Transformer oil has a high dielectric strength, allowing it to fully integrate with insulating paper to enhance insulation strength.

3.Strong overload capacity

Oil-immersed transformers can withstand loads exceeding their rated capacity for short periods of time. The temperature of the oil rises relatively slowly, providing a buffer for the load.

4.Strong protective capabilities

Insulating oil covers the internal components of the transformer, preventing them from coming into contact with air and extending the service life of the equipment.

5.Excellent arc-quenching performance

Insulating oil decomposes at high temperatures to produce gases with arc-quenching capabilities, which can quickly extinguish arcs.

6.Cost effective

Under the same capacity, oil-immersed transformers have lower manufacturing costs and lower no-load losses.

Core components of oil immersed transformer

Insulating oil

Insulating and cooling medium for transformers, meeting the standard of a breakdown voltage greater than 40KV.

Core

A closed magnetic circuit formed by laminated silicon steel sheets, which reduces logistics losses.

Windings

High/low-voltage coils made of copper or aluminum wires, with each turn wrapped in insulating paper.

Oil tank

Holds the insulating oil, windings, and core; a sealed container that prevents external air ingress.

Radiator

Radiators and fins are typically installed on the oil tank to increase the heat dissipation area and achieve better heat dissipation.

Oil reservoir

Regulates oil volume, reduces oil oxidation, and isolates air.

Bushing

Made of ceramic or composite insulators, it leads the winding leads out of the oil tank. Low-voltage bushings are typically smaller than high-voltage bushings.

Relay

Monitors gases in the oil and issues an alarm in case of a fault.

Pressure Relief Valve

Can quickly release internal pressure during operation to prevent bursting due to excessive local pressure.

Oil Level Gauge/Oil Temperature Gauge

Allows operators to clearly observe changes in oil temperature and monitor oil conditions, enabling proactive troubleshooting.

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The professional China Oil Immersed Transformer manufacturer and supplier, we have own factory. We will give you the satisfactory quotation. Let us cooperate with each other to create a better future and mutual benefit.

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