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A JCL technician connecting oil processing lines on a transformer
24/7/365 · Nationwide

Field Services

Installation, testing, maintenance, repair, and emergency response for power transformers across North America.

What we do

Three ways we help.

JCL technician at an energized substation transformer

Install & Commission

Assembly, oil filling, acceptance testing, energization, rigging coordination, and technical oversight to get new equipment safely into service.

Learn About Commissioning
A JCL technician mid-service with a wrench

Maintain & Repair

Routine maintenance, electrical testing, oil processing, inspections, troubleshooting, and repairs that keep transformers operating reliably.

Schedule Service
A JCL test trailer rolling out at dawn

Emergency Response

24/7 dispatch for transformer failures, emergency repairs, diagnostics, and temporary bridge power when downtime isn't an option.

Call Now
Capabilities

Capabilities overview.

If it happens on a transformer, a JCL crew handles it on site.

Installation & Commissioning
Receiving inspectionAssemblyOil fillingAcceptance testingEnergizationHeavy haulingRelocationTechnical supervision
Testing & Diagnostics
Electrical testingDGASFRATTRPower factorInfraredOil samplingCT testingWinding excitationLeakage reactanceDevice & alarm checks

Sampling and diagnostics performed to published ASTM methods — from DGA to furanic analysis of remaining insulation life.

Maintenance & Repair
Preventive maintenanceLeak repairComponent replacementGauge calibrationRegasketingLTC maintenanceLTC overhaulsUpgrade kitsOil preservation upgradesAll manufacturers
Oil Processing
Vacuum fillHot oil processingDry outNatural ester retrofillsFluid handling
Engineering Support
Condition assessmentsLife extensionFailure analysisThermal upratesRetrofit studies
Training
LTCMaintenanceTestingOil processing
Emergency Response
24/7 dispatchFailure triageEmergency repairsRental bridge power

Not seeing a service you need? If it can be done on a transformer, we've done it. Ask our team →

JCL-owned fleet

The equipment comes with us.

JCL owns and mobilizes its own test and oil-handling equipment — SFRA to breaker timing, vacuum processing to dry air — so scheduled work doesn't wait on third-party availability.

6
Test equipment sets
4
Vacuum processing rigs
30+
Fleet assets
When something goes wrongCall → Dispatch → Diagnose → Repair or bridge power
Call now · 866.983.1300
Recent field work

What crews like yours have called us for.

References available on request
Utility

420 MVA · 345 kV

Power substation transformer
DisassemblyRelocationReassembly
Data center

56 MVA × 24

Substation installations
InstallsDry-type commissioningOil samplingInspections
Industrial

5–40 MVA fleet

Transformer fleet program
RegasketingFull testing suiteBushing replacementOil processingLeak repairs
Renewables

220 MVA · 345 kV

Substation + HV breakers
RelocationBreaker asset management230–550 kV
Contractor / EPC

70 MVA install

Greenfield government site
Restricted accessCritical pathSubstation install
OEM programs

5–1100 MVA

Warranty service scopes
OEM certifiedWarranty-approvedDomestic & foreign
Industries we supportUtilitiesData CentersIndustrialRenewablesAND MANY MORE...

Tell us what's going on.

You don't need to know exactly what service you need. Describe the transformer, the project, or the problem.