Transformers and electrical testing
Transformer maintenance: high-vacuum filtration, oil, gasket and seal replacement, and connection tightening, together with field electrical testing. The tests to be performed are confirmed with the technical lead before the work is scheduled.
Reference standards
- NOM-001-SEDE
- Electrical installations
- NOM-029-STPS
- Electrical installation maintenance
- NMX-J-116
- Distribution transformers
- IEEE C57
- Transformer test reference
Executed work
Fig. 01Current transformers mounted inside a metering cabinet 
Fig. 02Metering base with current transformers and a fuse block 
Fig. 03Electronic voltage regulator installed beside production equipment
Service scope
- 01
Dielectric oil analysis
Sampling on site and management of the insulating-oil analysis.
- 02
High-vacuum filtration
Filtration and dehydration of insulating oil using high-vacuum equipment.
- 03
Oil, gasket and seal replacement
Replacement of oil and sealing components based on the condition of the unit.
- 04
Connection tightening and cleaning
Inspection and tightening of connections, cleaning of bushings and insulators.
- 05
Field electrical testing
Ductor, insulation resistance, core insulation, TTR and power factor, subject to the requirement and technical confirmation.
- 06
Protection and breaker testing
Relay and breaker testing, Hi-Pot and VLF, subject to the requirement and technical confirmation.
Tests performed and documented
What you receive at close-out
- Technical report on the tests performed by GC
- Result, report or certificate from the laboratory or authorized unit where applicable
- Maintenance recommendations based on the condition found
Field tests included in the scope are performed and documented by GC. Analyses or verifications that require accreditation are coordinated with the corresponding accredited laboratory or authorized unit.
- Tests to be performed confirmed with the technical lead
- Lockout/tagout applied before any work on the equipment
- Oil sampling and dielectric analysis
- Measured values compared against the applicable reference criteria
- De-energization and return to service planned in advance
Related capabilities
These families are frequently quoted and executed inside the same project.
Electrical systems and substations
Substations, distribution networks and industrial or commercial electrical installations in medium and low voltage.
Maintenance and field service
Preventive and corrective maintenance with our own crews: electrical, mechanical and pneumatic work as a single service.
Engineering and technical staffing
Electrical design in 2D and 3D, code documentation, project management and technical personnel assigned to the job.
Get a quote for the work you need
Tell us the equipment, the location and the type of intervention. We review the information to prepare the quotation or to ask for what is missing.