GEAFOL Cast-Resin Transformers
Environmentally friendly dry-type transformers
LV terminals: normal arrangement: top, rear; Special version: bottom, available on request at extra charge
Insulation: Mixture of epoxy resin and quartz powder: makes the transformer practically maintenance-free, moisture-proof, suitable for the tropics, flame-resistant and self-extinguishing.
HV tappings (on the HV terminal side): for adjustment to the particular network conditions, reconnectable in deenergized state
LV winding: made of aluminum strip; turns bonded with short-circuit-proof insulating sheet (Prepreg)
Output range from 50kVA up to 0 MVA
Operating voltages up to 52 kV
Customized solutions for
New, апреля 23, 2018
GEAFOL cast-resin transformers in protective housings with ADWF cooling system
Space-saving and highly efficient unit made from GEAFOL®: Siemens offers a protective housing with forced air and water cooling for special requirements.
The technology of GEAFOL dry-type transformers
Find out why the GEAFOL is setting new standards
- The certified quality
- The insulation
- The aluminum foil winding
- Epoxy resin casting process
- The recycling
Exceeding highest safety standards
GEAFOL dry-type transformers satisfy the requirements of the highest-defined classes, as proven by comprehensive testing:
- E2 Environmental class
- F1 Fire resistance class
- C2 Climate category
Since July 1, 2015, transformers that are installed within the European Economic Area (EEA) must meet the ecodesign requirements of the new directive, provided that they fall within the scope of the directive. Because the directive is a measure to implement Ecodesign Directive 209/125/EC, the CE mark is used as evidence of compliance. GEAFOL Neo transformers are designed accordingly and are particularly low-loss and economical. The transformers fulfill standard DIN EN 50588-1. In addition, the GEAFOL Neo can already be configured in accordance with stage two of the Ecodesign Directive, which sets even stricter minimum standards for energy efficiency and must be implemented by July 1, 2021.
We produce the GEAFOL in accordance with VDE 0532-76-11, IEC 60076-11, DIN EN 60076-11, DIN EN 50541-1 and EN 50588-1 (ecodesign). GEAFOL dry-type transformers also can be designed to meet special national specifications, or customers’ wishes. The high quality standard of the GEAFOL transformers was confirmed from the result of several tests: For example, one and the same GEAFOL transformer has passed all defined routine, type, and special tests, as well as additional tests, with flying colors. The comprehensive safety certification enables the use in almost every environment and under extremely harsh conditions such as:
- Ambient temperatures of ± 60 °C
- Aggressive, salt-laden atmospheres
- Great mechanical stress e.g. on ships, cranes or nacelles of wind power plants
Maintenance-free & eco-friendly
GEAFOL dry-type transformers are insulated with an epoxy resin and quartz powder mixture – an eco-friendly material that makes the winding
- almost maintenance-free
No toxic gases are produced, not even under the effects of arcing. And the specially developed spacers of the coil support system ensure isolation of vibrations from the iron core, which means very low noise levels.
The coils of the high-voltage windings are made of aluminum foil.
Why foil windings?
- They combine simple winding techniques with high electrical safety.
- Insulation is subjected to less electrical stress than in other types of windings.
- The result: high power frequency and impulse voltage withstand capability.
- Thermal expansion coefficients of aluminum and cast resin are similar.
- The result: thermal stresses due to load changes are kept to a minimum.
On request, we offer dry-type transformers with copper windings.
No gas inclusions
The high voltage windings are potted with epoxy resin under vacuum at a high temperature:
- Undesirable gas inclusions are prevented.
- Freedom from partial discharges (up to twice the rated voltage) is provided.
The low-voltage strip winding is also made of aluminum. The width of the aluminum strip is equal to the length of the coil:
- Axial short-circuit forces in the transformer are reduced.
The conductor strip and insulation material are bonded together by heating:
- A compact unit with sufficient strength to reliably withstand radial forces is created.
GEAFOL dry-type transformers still have benefits even at the end of their life cycle: without any danger to the environment, 94 percent of the material can be recycled.
Find the right GEAFOL dry-type transformer
Accessories and individual solutions for our transformers
For our GEAFOL dry-type transformers, we offer accessories and tailored solutions that suit your individual needs. Here is a selection of additional equipment available upon request:
New housing design
Innovation is something you can also see, at least when it comes to the new, award-winning GEAFOL housing whose stylistic idiom is based on the new transformer family design. Besides these purely visual aspects, the housing offers our customers other benefits as well.
Higher mechanical stability
Because the transformer and housing are delivered on a common base frame as a permanently mounted unit, they offer an extremely stable, robust overall configuration. This is further supported by the mechanically fixed installation of the transformer and the use of phases at the housing corners. Crossbraces can also be used at the transformer on request.
Greater flexibility and safety
The housing roof can be opened from the inside to permit hoisting by crane. The bolts connecting the housing and transformer are accommodated inside the housing for a higher degree of personnel safety. And thanks to the fully modular construction, a subsequent upgrade to a higher protection class (IP class) is possible at any time. Versions for indoor and outdoor installation in multiple protection classes as well as various installation options such as, for example, “infrared window,” are available. Further information upon request.
Explore the GEAFOL
Installation and operation
The following operating instructions guide you through installation, connection, temperature monitoring, commissioning as well as cleaning and inspection of your GEAFOL.
The Siemens GEAFOL App
With our GEAFOL App for Apple and Android devices, you can watch the operating instructions on- and offline on your tablet or smartphone:
Contact and ongoing service
Our responsibility does not end with the delivery – beside the application of our service engineers on-site we offer individual trainings for your employees. For more information we are gladly at your disposal at any time.
Contact us and get your GEAFOL transformer
Do you need a tailored transformer solution to meet your unique business challenges? Tell us your requirements and we will find the right GEAFOL dry-type transformer
Make use of our services
For your convenience, we have assembled relevant downloads as well as details of support contacts below.
Fields of operation
Discover the many fields of operation
Since 1965, over 100,000 GEAFOL Cast-Resin Transformers have proven themselves in power distribution or converter operation around the globe. Whether in a wind park in Tasmania, a paper production factory in South Africa, or the Transrapid line between Shanghai and the Pudong, our dry-type transformers ensure reliable power supply anywhere, any time.
GEAFOL contributes to eco-friendly power on the high seas
approximate savings on CO2 emissions
approximate overall machinery efficiency
Reliable energy for Germany’s largest cloud
maximum power consumption
Despite its huge IT area, the data center ranks among the most modern and energy-efficient in its class
Top performance under extreme circumstances
drilling depth below the sea floor
News and events
Stay up do date in the matter of GEAFOL
Learn more about the GEAFOL at one of the following trade fairs: