SIEMENS GEAFOL CAST RESIN TRANSFORMER

GEAFOL Cast resin Transformers reflects the GEAFOL principle which has succeeded in producing distribution transformers with excellent electrical, mechanical and thermal characteristics, which have also proven to be particularly compatible with the environment.

GEAFOL Cast resin Transformers : Exceeding highest safety standards

GEAFOL dry-type transformers conform with the fire behavior, environmental and climate classes defined in standard IEC 60076-11 as follows:

• E2 Environmental class (E3 on request)
• F1 Fire behaviour class (highest defined class)
• C2 Climate category     (C3, C4, C5 on request)

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.

EU requirements for transformers

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
• moisture-resistant
• tropicalized
• flame-retardant
• self-extinguishing

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.

Electrically safe

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.

Why aluminum?

• 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 also offer dry-type transformers with copper windings, namend CARECO.

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.

SUSTAINABLE

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.

Siemens Transmission Products – Leader in innovations with comprehensive, connective and sustainable portfolio

Transmission products play a vital role in the energy value chain. Siemens Transmission Products provides all key elements including power transformers and distribution transformers as well as gas-insulated and air-insulated switchgear and components. Products are offered individually, bundled or with related engineering upgrade to systems. Our products offer low life cycle costs with maximum availability, highest efficiency and short commissioning times.