LikangCao@vanenergy.org +1 (323) 451-1707
Vanguard Energy Group LLC

Transformers, switchgear and field service for power and energy-storage projects

Power and pad-mounted transformers, Eaton switchgear and components, and on-site repair for transformers, substations and inverters, from one engineering team.

EHV Power Transformer, 330–750 kV
EHV Power Transformer, 330–750 kV
Voltage class
330–750 kV
Capacity
up to 1140 MVA
Design
1- or 3-phase
35–750 kVTransformer voltage range we supply
110+Product lines in our catalog
24 hResponse to quotation and repair requests

Field service and repair

All services

Power transformer repair

Inspection, testing and on-site repair of oil-immersed main and step-up transformers.

  • Oil leak and weld repair, gasket and bushing replacement
  • Electrical testing: TTR, winding resistance, insulation resistance
  • Insulating oil sampling, filtration and top-up
  • Tap changer, gauge and protection device checks
How we work

Pad-mounted and substation service

Fleet inspections and corrective maintenance for pad-mounted transformers and compact substations.

  • Fleet leak and pressure surveys, unit by unit
  • Nitrogen re-pressurization and pressure verification
  • Loadbreak switch, Bay-O-Net and bushing replacement
  • Repairs documented with photos for every unit
How we work

Inverter and PCS repair

Fault diagnosis and repair of central and string inverters and power conversion systems.

  • Fault code diagnosis and root-cause analysis
  • Power module, board and fan replacement
  • Firmware updates and parameter checks
  • Re-commissioning and performance verification
How we work

From inquiry to delivery

Most orders follow the same five steps. You deal with one engineer from the first question to the delivery receipt.

  1. Send your requirement

    Share models, a single-line diagram or a BOQ. For repairs, send the equipment details and what you are seeing.

  2. Technical confirmation

    Our engineers check ratings, standards (IEEE, IEC, DOE) and site conditions before we price anything.

  3. Quotation within 24 hours

    Unit prices or a service scope, lead time, and the documents and tests included.

  4. Delivery or site work

    Factory-tested equipment with test reports, or a field crew on site with the right tools and permits.

  5. Report and after-sales

    Every service job closes with a written field service report. Spares and support continue after handover.

Need a price or a service crew?

Send a model list, a tender BOQ or a short description of the fault. We come back with prices and lead times, or a service scope and schedule.

  • Factory test reports and datasheets with every unit
  • Field crews for transformer, substation and inverter repair
  • Written field service report for every repair job

Request a quotation

We reply within one business day. Your details are used only to answer this inquiry.