Transformer field services and diagnostics since 1980
Since 1980 we have specialized in dielectric oil analysis, electrical testing, corrective maintenance, predictive maintenance and the commissioning of distribution, medium-voltage and power transformers.
Our experience, specialized personnel and high-technology equipment allow us to deliver precise diagnostics and carry out field work safely, efficiently and reliably, supporting our clients' operational continuity.
We deliver services directly at the client's site through mobile units equipped to perform electrical testing, oil treatment, vacuum operations and specialized transformer maintenance.
Why choose Mantenimiento Eléctrico Costel?
The only dielectric oil analysis laboratory in the country accredited by SENCAMER (ISO/IEC 17025).
State-of-the-art equipment for electrical testing and transformer diagnostics.
Capability to perform high-vacuum operations and oil treatment in the field.
Mobile units equipped to carry out work directly at the client's facilities.
High-capacity filtering, degassing and dielectric oil processing equipment.
A vehicle fleet with its own power generation to operate at any location.
Capability to replace bushings and components and to work at height with specialized equipment.
Technical personnel with extensive experience in power transformer maintenance and commissioning.
Early fault detection through oil analysis, thermography and specialized electrical testing.
Fast field response to minimize downtime and operational losses.
Mobile units and field equipment for on-site diagnostics and maintenance.
Equipment we service
- Dry-type transformers, low, medium and high voltage.
- Distribution transformers of every rating.
- Medium-voltage transformers for industrial and commercial applications.
- Power transformers up to 800 kV.
Our Services
Dielectric oil analysis
Our specialized laboratory makes it possible to assess the condition of insulating fluids and detect faults or degradation processes early, before they affect transformer operation. Available tests:
- Physical and chemical analysis of dielectric oil.
- Dissolved gas analysis (DGA).
- Determination of furanic compounds and inhibitor content.
- PCB (polychlorinated biphenyl) analysis.
- Assessment of dielectric properties.
- Diagnosis of insulation ageing.
- Technical reports and recommendations.
Diagnostics, electrical testing and predictive maintenance
We perform specialized testing and predictive monitoring to determine the operating condition of transformers, anticipate failures and plan interventions. Includes:
- Power factor (Doble) and insulation resistance (Megger).
- Turns ratio (TTR) and winding resistance.
- Infrared thermography and specialized visual inspection.
- Dew point measurement and verification of protection systems.
- Condition diagnosis and degradation trend analysis.
- Operational risk assessment.
- Technical reports and intervention recommendations.
Oil-immersed transformer maintenance
We run preventive, predictive and corrective maintenance programs designed to preserve reliability and extend the service life of transformers. Our process includes:
- Replacement, treatment and regeneration of insulating oil.
- Recovery of dielectric properties and restoration of inhibitors.
- Nitrogen injection and leak repair.
- Replacement of gaskets, seals, bushings and silica gel.
- Maintenance of on-load and off-load tap changers.
- Drying of the active part through high-vacuum processes.
- Electrical control tests, thermography and surface recovery.
Dry-type transformer maintenance
We preserve the electrical and thermal properties of dry-type transformers through specialized cleaning, adjustment and diagnostic procedures. Includes:
- Cleaning with solvents of high dielectric strength.
- Controlled drying with nitrogen.
- Adjustment and retightening of connections.
- Electrical testing (TTR and Megger).
- Thermography for hot-spot detection.
- Diagnosis of operating condition.
Dielectric oil processing
We have specialized equipment for dielectric oil treatment with a processing capacity of up to 6,000 liters per hour, directly at the client's facilities. Services:
- Dielectric oil filtering.
- Degassing.
- Moisture removal.
- Recovery of dielectric strength.
- High-vacuum processing.
- Final control sampling and analysis.
Assembly and commissioning
We have the personnel and specialized equipment for the assembly, erection and commissioning of power and distribution transformers. Includes:
- High-vacuum operations and dew point measurement.
- Oil filling under vacuum.
- Installation of radiators, bushings and expansion tanks.
- Treatment and conditioning of insulating liquids prior to filling.
- Pre-energization testing.
- Commissioning and technical support.
Certifications
ISO/IEC 17025
Testing Laboratory accredited by SENCAMER for dielectric oil analysis.
ISO 9002
Quality Management System under the ISO 9002 standard.
RACDA
Technical handling of dielectric oils.
Doble Engineering Company Technology
We perform specialized electrical testing with Doble equipment, world leaders in the diagnosis and assessment of power transformers.
Environmental Management based on 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
Our operations are carried out under the guidelines of the ISO 45001:2018 standard and in strict compliance with LOPCYMAT, Venezuela's occupational health and safety law, promoting safe working environments and protecting the health and wellbeing of our people on every project.
One contact. Every solution.
Our technical team is available 24/7 to support your operation.
Contact us