WEG Mobile substations (50 MVA class observed)
WEG mobile substations, dual-voltage trailer units built in Brazil and integrated by Zest WEG
WEG Mobile substations (50 MVA class observed) is one of 32 data center transformers tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.
WEG mobile substation dossier: 50 MVA dual-voltage trailer units from Brazil, Zest WEG integration, delivered-project specs, market watch, inspection.
Why it matters
Every mobile substation matters in a market where fixed transformers quote up to 4 years, and WEG's dual-voltage designs stretch one asset across two grid standards, a real advantage for utilities with mixed systems. For SecondWatt the line is a watch item: as WEG's US presence grows, Brazil-built mobiles could enter the North American rental pool.
Who buys it
Utilities in Latin America and Africa are the documented buyers, using mobiles for outage cover and rural multi-point service; miners take temporary power. US data center buyers would encounter WEG mobiles only through import, competing against domestic Delta Star and Hitachi Energy fleets with established service networks.
Role in the data center
Not yet a US data center asset; relevant as future rental-pool supply and as the dual-voltage design benchmark for mixed-standard campuses abroad.
Key specifications
| Largest documented rating | 50 MVA |
|---|---|
| Primary voltages | 110 / 60 (dual-rated) kV |
| Secondary voltages | 20 / 30 kV |
| Trailer count (50 MVA unit) | 3 |
| Manufacture / integration | WEG Brazil / Zest WEG |
| Reference commissioning | early 2022 (Guinea) |
| Brazil utility delivery | CEA Equatorial, Amapa |
| Africa production first | first mobile substations made in Africa |
Pricing and availability
Trend: up Lead time, new: Engineered to order; quoted per project. Lead time, used or refurbished: 2-12 weeks. Warranty, used: 3-year typical from major US rebuilders.
Lifecycle and maintenance
Liquid-filled transformers routinely serve 30-40 years with annual oil screening, DGA on a 1-2 year cadence (or continuous online monitoring on critical units), and gasket or bushing service as tests dictate. Major US rebuilders remanufacture units to like-new condition with warranties up to 3 years (T&R Electric, Sunbelt Solomon), and reconditioned stock ships in days against 65-210 week new-build queues. Remaining paper life, estimated by furan testing, governs end-of-life valuation.
Common failure points
- Windings — Dielectric failure; windings dominate major-failure statistics in CIGRE TB 642
- Bushings — Failure share rises with voltage class; OIP bushing faults can rupture tanks
- OLTC — Contact and mechanism wear; prominent failure source on substation units
- Winding deformation — Through-fault or transport damage shifting SFRA signature
- Cooling system — Pump, fan, and radiator degradation derating the unit
- Moisture and paper aging — Furans in oil and reduced degree of polymerization
Inspection checklist
DGA — dissolved gas analysis per IEEE C57.104; combustible-gas trend rise between 2 samples triggers investigation Oil quality — dielectric breakdown, moisture, acidity, and furan tests; degree of polymerization below 200 marks end of paper life Insulation resistance — megger HV/LV/ground; polarization index of 2.0 or higher passes Power factor — insulation power factor testing; values above 1.0% on oil-filled windings warrant investigation Turns ratio — TTR on all taps; deviation beyond 0.5% from nameplate fails Winding resistance — three-phase balance within 2% between phases Bushings — capacitance and power factor test; bushing failure share rises with voltage class per CIGRE TB 642 OLTC — inspect on-load tap changer diverter and selector; OLTCs are a leading failure component in CIGRE TB 642 fleet surveys SFRA — sweep frequency response analysis per IEEE C57.149 against baseline to detect winding deformation after transport Transport records — review impact-recorder data per IEEE C57.150 for any relocated unit of 10 MVA and above Core ground — verify a single intentional core ground; inadvertent grounds show as gassing in DGA Cooling — inspect radiators, pumps, and fans; verify stage ratings (ONAN/ONAF) against nameplate Tank and conservator — corrosion survey, gasket inspection, and pressure relief device function Nameplate verification — confirm MVA stages, impedance, BIL, and 55/65 C rise data against the factory test report Records — complete factory test report, DGA history, through-fault history, and loading records from service
Procurement channels
WEG catalog channel and Zest WEG for new; no used WEG mobile substations observed. Generic used-mobile channels: Surplus Record three-phase categories and Delta Star remanufacturing.