We provide you with high-quality oil-based transformers from trusted local and European brands, in various sizes to meet all your operational needs with efficiency and reliability.

Sizes range from 25 kVA to 2500 kVA

What is an oil transformer?

It is an electrical transformer that uses mineral oil as an insulating and cooling medium. It is more common in electrical grids and cheaper than dry-type transformers. It is available in small, medium, and large capacities and is used for the transmission and distribution of electrical power.

The Difference Between Dry-Type and Oil Transformers

Dry-Type Transformer

Insulation and cooling: It is done using solid insulators and air (no oil).

Suitable Location: It is usually used inside buildings, hospitals, malls, and enclosed spaces that require high security.

Maintenance: It requires less maintenance because it does not contain oil.

Safety: It is safer against fires and leaks.

Lifespan: Slightly shorter than oil-type transformers, especially under high loads.

Cost: More expensive than oil-type transformers of the same capacity.

Oil-type transformers

Insulation and cooling: It relies on mineral oil to insulate and cool the coils.

Suitable Location: Often installed in outdoor stations or special rooms with ventilation.

Maintenance: Requires regular monitoring (checking the oil level, changing the oil if contaminated, monitoring the humidity).

Safety: Risk of fire or oil leakage.

Lifespan: Longer than dry transformers if properly maintained.

Cost: Cheaper than dry transformers of the same capacity.

Key Advantages of Oil Transformers

Their ability to effectively cool the windings with oil, provide excellent electrical insulation, extinguish arcs faster, and handle large capacities and high voltages, making them suitable for industrial applications and large-scale distribution networks. They are also less expensive than dry transformers.

Efficient Cooling

Transformer oil utilizes its high thermal properties to absorb and dissipate the heat generated by transformer operation, maintaining optimal operating temperatures.

Excellent Insulation

Oil provides a dielectric strength significantly higher than air, enhancing insulation and protecting internal components from moisture and damage.

Arc Suppression

Oil has excellent thermal conductivity and the ability to handle high temperatures, which helps suppress the electric arc generated by switching operations within the transformer.

High Capacities and High Voltages

Oil transformers are available in very large capacities and can handle high voltages, making them suitable for large-scale power transmission and distribution networks.

Low Cost

Oil transformers are less expensive than dry-type transformers, making them an economical choice for various applications.

High Power Density

Oil-immersed transformers have a higher power transfer capacity relative to their size.

Disadvantages of Oil Transformers

Regular maintenance is required to ensure the integrity and quality of the oil.

Possible lower efficiency compared to dry-type transformers in some situations.

Requires an 80% safe load to avoid oil overheating and superheating.

Heavier weight compared to dry-type transformers due to the presence of an oil tank.

Where are oil transformers used?

Oil transformers are best installed in open spaces or in separate, well-ventilated rooms because they contain insulating oil and are flammable.

They are widely used because they can withstand high loads and operate efficiently for long periods.

Power Plants

To raise the output voltage from generators to a higher transmission voltage.

Transmission and Distribution Networks

In substations to reduce the voltage from high to medium.

In distribution stations to reduce the voltage from medium to low (for consumers).

Industrial Areas

To supply power to factories that require high electrical capacities.

Large Residential and Commercial Complexes

Especially in open spaces or dedicated, well-ventilated rooms.

Oil Fields and Major Projects

Because they can withstand continuous loads and harsh conditions.