Oil Transformers
Oil Transformers
Full power under
all conditions.
Our oil-immersed transformers comply with international standards and where applicable, technical customer requirements. They are available in hermetically sealed versions, as transformers with expansion tanks, with or without distribution systems and as medium and high-power transformers.
Oil Transformer Types
- Distribution Transformers
- Transformers for Solar and Wind Parks
- Earthing Transformers
- Autotransformers
- Dual Voltage Transformers
- Rectifier Transformers
- Shunt Reactors
- Traction Transformers
In Sealed Design
Hermetic Transformers
- 6.3 MVA
- Megavoltamperes
Hermetic oil transformers are made with a power of 6.3 MVA and a network voltage of up to 36 kV. Three-phase, oil-cooled standard transformers (ONAN) are available with internal (plug-in type) or external porcelain insulators.
Special load-free tap changers and other cooling systems such as ONAF, OOAF, etc. can also be installed on customer request.
Hermetic transformers have no expansion tank and are completely filled with oil. The hermetic seal protects against atmospheric influences and is factory-adjusted. The elastic boiler tank with its corrugated walls controls the thermal expansion of the oil.
The oil in hermetic transformers does not come into contact with air, so there is no risk of absorbing air or moisture. Hermetic transformers are particularly suitable for small spaces or placement in compact transformer stations, and are fundamentally maintenance-free.
Application Areas
- MV/LV Transformer Stations
- Factories
- Construction Sites
- Urban Distribution Systems (Pole or Box)
- Irrigation Projects
- Industrial Zones
- Power Plants
Our hermetic oil transformers are specially designed to ensure maximum operational efficiency and outstanding performance.
With Conservator
Oil Transformer with Expansion Tank
- 20 MVA
- Megavoltamperes
Oil transformers with expansion tanks are made with a power of 20 MVA and a network voltage of up to 36 kV. Three-phase oil-cooled standard transformers (ONAN) are available with internal (plug-in type) or external porcelain insulators.
On customer request, special load-free tap changers and other cooling systems such as ONAF, OOAF, etc. can also be installed.
In oil transformers with expansion tanks, the oil is constantly in contact with the surrounding air. Therefore, regular maintenance is important.
Application Areas
- Factories
- MV/LV Transformer Stations
- Urban Distribution Systems
- Industrial Zones
- Power Plants
Our commitment to quality ensures that each transformer meets the highest international standards for durability and performance.
For High-Voltage Networks
Power Transformers
- 400 MVA
- Megavoltamperes
- 330 kV Class
- max. Rated Voltage
Power oil transformers are manufactured according to international standards such as IEC, IEEE, etc., according to customer requirements. They have a power range from 5 MVA to 400 MVA and mains voltages up to 330 kV.
Single-phase and three-phase transformers are available as customised products with ONAN, ONAF or ODAF cooling and with or without load tap changers.
These oil-filled transformers are designed to withstand extreme operating conditions, which is ideal for use in power stations, substations and large industrial plants.
Application Areas
- Long-distance power lines
- Industrial plants
- Power stations
- Internal power supply
Our power transformers are specially developed for large-scale power transmission applications and ensure maximum reliability and efficiency in high-voltage grids.
Oil Transformer
Tests
The following national and international quality tests are carried out in our accredited laboratory for oil transformers:
Routine Tests
- Measurement of the winding resistance
- Measurement of voltage transformation factor and phase difference
- Resistance measurement on the insulator
- Measurement of short-circuit impedance and charging loss
- Measurement of decoupling losses and voltage
- Application of voltage tests
- Induced voltage test
- Partial discharge measurement
Type-Specific Tests
- Testing the temperature rise
- Lightning strike test
- Measurement of the sound level
Special Tests
- Determination of the capacitance between the coils and the earthing via the coils
- Measurement of the zero-sequence impedance for 3-phase transformers
- Short-circuit resistance measurement
- Harmony test with current switched off
- Measurement of the insulation resistance from coil to earth
- Power factor measurement (tangent-delta measurement)
- Service life test of the boiler
Contact us for more information!
Request form
Request a quote for your transformer
Tell us the technical parameters you need – rated power, voltages, type and accessories – and our team will prepare a tailored offer.
Go to the enquiry formContact
Akar Energy GmbH
Am Logistik Park 3
85416 Langenbach
Germany