85 years
Kolektor ETRA
We are a company that has the capacity to produce energy and power generator transformers up to 500MVA and voltages up to 420kV. We focus mainly on technical areas, such as loss and noise level reduction. Innovative, professional and responsible are the words which characterize the company by our valued customers over the years.
More About Us

85 years
The satisfaction of creating excellence
Kolektor Etra objective is to supply products that satisfy customers with their technical parameters and high quality as well as optimal ratio between price and performance.
With experienced and qualified team we are able to carry out all routine, standard and special tests required by international standards.
Areas Of Expertise
- Electromagnetics
- Structural Mechanics
- Thermodynamics
- Acoustics
- Anti-corrosion
Services
- Transformer repair
- Servicing and Maintenance
- Decomposition and Recycling of Old Transformers
MANUFACTURING PROGRAM
Transformers
Power
transformers
Power transformers and autotransformers of up to 500 MVA rated power and 420 kV rated voltage with on-load and off-load…
Special
transformers
To meet industrial demands,KOLEKTOR ETRA d.o.o. also manufactures special transformers: furnace transformers…
Distribution
transformers
Distribution transformers Series 8 of 50 kVA to 1600 kVA rated power and up to 24 kVrated voltage – a new series of distribution transformers, filled with environmentally friendly liquid Midel 7131, transformer mineral oil and in dry version (Dry-type transformers).
TRANSFORMERS FOR OFFSHORE
KOLEKTOR ETRA is a renowned supplier of power transformers specifically designed to meet the requirements for offshore installation. Check our offshore references in an interactive map, where you can find locations of offshore platforms with our transformers.