Core Activities of Navitas TEX are: 
Assembly of power transformers
Navitas TEX is specialized in the complete on‑site assembly of power transformers at the customer’s location, including:
- Reception and inspection of equipment
- Assembly of equipment (bushings, cooling system, protective devices)
- Vacuum treatment of the transformer tank and oil filling
- Drying and processing of the insulation system
- Electrical and functional tests
- Transformer commissioning
The company has the capacity to work on transformers ranging from 50 kVA to 400 MVA, with a special focus on large power transformers rated 110 kV and above.
On‑site overhaul of power transformers
Navitas TEX provides a complete transformer overhaul service directly at the facility site.
These activities include:
- Transformer condition diagnostics
- Active part inspection
- Replacement of insulation components
- Cooling system servicing
- Oil replacement and regeneration
- Thermographic and electrical testing
- Recommissioning
- Dismantling, handling and relocation
- Preservation for long‑term storage of existing units (spare units)
The work is planned and carried out with minimal downtime and high safety and security measures for the operation of the power system.
Inspection of all types of transformers
The company performs technical inspections of transformers of various types and manufacturers.
Inspections include:
- Detailed technical examination
- Insulation system check
- Contact and connection check
- Electrical parameter measurements
- Oil and insulating material analysis
- Preparation of expert reports and studis
On‑Load Tap Changer (OLTC) Servicing
Navitas TEX has expertise in the servicing and overhaul of on‑load tap changers (OLTC).
Servicing includes:
- Disassembly and mechanism inspection
- Contact replacement
- Drive mechanism adjustment
- Oil replacement
- Functional testing
- Commissioning
The work is carried out in accordance with manufacturer standards and international power system norms.
Substation Servicing and Inspection
The company provides maintenance and inspection services for:
Distribution substations up to 35 kV and 12.5 MVA
Services include:
- Power transformer inspection
- Medium‑voltage switchgear inspection
- Circuit breaker and disconnector servicing
- Protection system checks
- Earthing (grounding) measurements
- Cable connection checks
- Functional testing
The goal of these activities is to increase the reliability of substation operation and extend equipment service life.
Navitas TEX has a permanently employed expert team of engineers and technicians specialized in working with high‑power electrical equipment.
The expert team possesses all necessary equipment, tools, spare parts, instruments for preventive and corrective transformer maintenance, as well as a state‑of‑the‑art machine for drying and regenerating oil and the insulation system.
ASTOR Enerji service partner for the region and Europe
One of the key pillars of Navitas TEX’s development is the strategic partnership with ASTOR Enerji, a manufacturer of distribution, power and special transformers. Navitas TEX is a strategic partner for defect inspection, servicing, assembly and testing of transformers for the region of Serbia and Montenegro, as well as the entire Balkan and European region.
Navitas TEX also offers its services to other partners, manufacturers, OEM and EPC companies in the field of power engineering.