More than 60 years driving the electrical sector
Since 1964, Costel has specialized in the manufacturing, maintenance and remanufacturing of distribution, medium-voltage and power transformers, delivering dependable solutions backed by experience, technology and a commitment to quality.
We focus on responding promptly to our clients' needs, providing specialized technical advice and guaranteeing high standards of execution, safety and quality control on every project.
Why choose Costel?
More than 60 years of experience in the manufacturing, maintenance and remanufacturing of electrical transformers.
Specialized remanufacturing capability that restores the performance, reliability and service life of transformers.
Raw materials and components of a quality equivalent to OEM specifications.
Treatment, filtering and conditioning of new dielectric oil to meet the manufacturer's specifications.
In-house testing laboratory with capacity up to 69 kV.
Industrial sandblasting process for the full recovery and preparation of surfaces, ensuring lasting protection against corrosion.
State-of-the-art technology and equipment for diagnostics, maintenance and quality control.
Dedicated facilities for distribution, medium-voltage and power transformers up to 100 MVA and 115 kV.
Specialized engineering for the diagnosis and resolution of complex faults.
Operations aligned with national and international standards of the electrical sector.
Transformer manufacturing
We design and manufacture electrical transformers tailored to each client's requirements, combining engineering, quality and reliability to guarantee optimal performance in the most demanding applications.
- Three-phase power transformers, dry-type and oil-immersed, up to 10 MVA and 35 kV.
- Three-phase and single-phase dry-type low-voltage transformers.
- Pad-mounted transformers.
- Autotransformers.
- Special designs and custom solutions.
Remanufacturing
We restore transformers to the manufacturer's original specifications and efficiency. Our process includes complete disassembly, full assessment, replacement of critical components, rebuilding and final testing, guaranteeing high levels of performance, reliability and extended service life.
- Oil-immersed transformers up to 100 MVA and 115 kV.
- Dry-type medium- and low-voltage transformers.
- Distribution transformers.
- Replacement of epoxy-encapsulated windings.
Comprehensive maintenance
We preserve the reliability and performance of transformers through specialized diagnostics, detailed inspections and preventive and corrective maintenance. Our approach lets us detect conditions that could develop into failures in good time, reducing operational risk and extending the service life of the equipment.
Incoming electrical tests and diagnostics.
Untanking and detailed inspection of the active part.
Washing and cleaning of the active part, tank and radiators.
Oven drying of the active part and accessories.
Washing and conditioning of high- and low-voltage bushings.
Replacement of gaskets, seals and worn components.
Leak repair and leak testing.
Dielectric oil replacement.
Tanking and transformer assembly.
Final electrical tests and quality control.
Delivery of technical report and test report.
Certifications
ISO 9002
Quality Management System under the ISO 9002 standard.
ISO 14001:2015
Our operations follow the guidelines and good practices of the ISO 14001:2015 standard, promoting responsible environmental management and the continuous improvement of our processes.
ISO 45001:2018 · Occupational Health and Safety
We operate under the guidelines of the ISO 45001:2018 standard and in strict compliance with LOPCYMAT, promoting safe working environments and protecting the health of our people on every project.
RACDA
Technical handling of dielectric oils.
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