We’re excited to share a new milestone in our product development: our Gravity Line transformers are now available in a version with rated voltage up to 36 kV. The prototype has successfully passed rigorous type and routine tests, including environmental testing, and meets all requirements for mechanical strength, thermal stability, and dielectric integrity.
This voltage extension is the result of focused development to offer our long-term customers – typically operating 10 kV and 20 kV networks – a proven and reliable solution also for 30 kV applications. With this step, we’re expanding the Gravity Line portfolio to support a broader range of distribution projects without compromising on quality or availability.
Why 36 kV? Responding to customer needs
This portfolio expansion was a direct response to specific customer requirements, particularly from mountainous regions of Austria, where the power grid is sparse and higher voltage is essential for efficient energy transmission. However, it also has strong potential for use in the Czech Republic, Germany, and Spain – in industry, renewable energy, and urban infrastructure. Higher voltage allows energy to be transmitted over longer distances with fewer losses, which is key for both new projects and modernization efforts.
Development and testing: safety and resilience first
To develop a transformer for 36 kV, it was necessary to redefine certain design parameters – especially insulation distances and HV coil configurations. Our design adopts two barrier cylinders which divides the stray duct and ensures safe operation at high voltage levels. The new models have successfully passed all routine and type tests including temperature rise test noise level test and lightning impulse (170 kV) test.
The transformer complies with the IEC 60076-11 standard and fully meets the requirements for environmental class E3, climatic class C3, and fire behavior class F1. The prototype for the 36 kV series demonstrated excellent resilience in all aspects, confirming its reliability and durability even under the most demanding conditions.
Efficient solution for demanding applications
Gravity Line transformers up to 36 kV are perfect for:
- Higher-voltage distribution networks
- Large industrial facilities and production sites
- Renewable energy sector
These applications demand high reliability, long service life, and flawless operation under challenging conditions. That’s why it’s crucial we offer a proven solution developed in collaboration between SGB CZ engineering and the central R&D team from our Business Unit DRY. It is a great example for successful global development efforts and shows the strong international set-up of the entire SGB-SMIT Group.
Advantages you can rely on
As with all Gravity Line products, the new 36 kV models offer:
- Eco-friendly design – more than 90% of materials used are recyclable
- High safety standards – meeting fire resistance and mechanical strength requirements
- Tailored solutions – in-house engineering allows flexible customization for any project
Pricing and availability
Gravity Line transformers up to 36 kV are available in ratings up to 2500 kVA. A standard price list is available upon request. We are happy to prepare a tailored offer or provide more details on how the design can be adapted to your specific operating conditions.
