Siemens Energy GEAFOL / GEAFOL Neo

Siemens Energy GEAFOL cast-resin transformers, with the GEAFOL Neo line current to 2026.

Siemens Energy GEAFOL / GEAFOL Neo is one of 32 data center transformers tracked in the SecondWatt catalogue, each with specifications, lead times and indicative secondary-market pricing.

Siemens Energy GEAFOL dossier: correct entity attribution, Neo line to 6.3 MVA, standard to 50 MVA and 52 kV, market channels, inspection checklist.

This slug carries the correct corporate attribution for GEAFOL and is the recommended survivor of the duplicate pair with siemens-geafol. GEAFOL belongs to Siemens Energy AG, independent of Siemens AG since the September 2020 spin-off; every live product asset, from the January 2026 GEAFOL Neo brochure to the operational manuals and official photography, is hosted on siemens-energy.com, and no GEAFOL page exists under Siemens AG Smart Infrastructure. The product facts match the twin entry: vacuum-cast quartz-filled epoxy insulation, GEAFOL Neo to 6.3 MVA at Um 40.5 kV, standard GEAFOL to 50 MVA at Um 52 kV, Converter variants to 50 MVA, CARECO copper-wound builds, classes F1/E3/C3, and IEC 60076-11 / VDE 0532-76-11 compliance with EU Ecodesign documentation. For SecondWatt's catalog the practical takeaways are two: route service and warranty questions to Siemens Energy Grid Technologies, and treat GEAFOL pricing as an intelligence gap worth owning, since both observed used channels (PS Auction, Machinio) gate their prices. A used 2023-build Neo 3,150 kVA reaching auction within three years of manufacture is itself a market signal: European fleet turnover has begun.

Why it matters

Attribution errors break procurement workflows: RFQs sent to Siemens AG for GEAFOL units stall, and warranty claims misroute. Beyond hygiene, the auction appearance of a 2023 Neo unit signals early European fleet turnover that will eventually feed the US gray market, worth tracking against the 20-32 week new-build dry-type queue.

Who buys it

Same buyer set as the GEAFOL twin entry: IEC-market data centers, wind and offshore projects, urban substations, and drive-system integrators. Procurement teams verifying vendor lineage land here; the entity distinction decides which Siemens sales channel answers, a real friction point since the 2020 spin-off.

Role in the data center

Indoor MV/LV and converter transformation in IEC-spec facilities; canonical catalog target for GEAFOL listings after the recommended merge.

Key specifications

Technical summary

Owner: Siemens Energy AG, Grid Technologies (spin-off Sept 2020) GEAFOL Neo: to 6.3 MVA, Um 40.5 kV GEAFOL standard: to 50 MVA, Um 52 kV GEAFOL Converter: to 50 MVA; CARECO copper variant Insulation: vacuum-cast epoxy with quartz powder Classes: F1 / E3 / C3 (higher available) Standards: IEC 60076-11, VDE 0532-76-11, EU Ecodesign Current literature: Neo brochure January 2026 Duplicate pair: retire siemens-geafol in favor of this slug

Pricing and availability

Trend: up Lead time, new: 20-32 weeks (dry-type class); large units longer. Lead time, used or refurbished: Auction-cycle dependent. Warranty, used: 3-year typical from major US rebuilders.

Lifecycle and maintenance

Cast-resin and VPI dry-type transformers typically serve 25-30+ years with minimal maintenance: periodic cleaning, PD testing on critical units, fan service on AF designs, and torque checks. There is no oil system to sample, so temperature and PD are the condition indicators. Rebuild options are limited compared with liquid units; failed coils are usually replaced rather than repaired, which makes pre-purchase PD and visual inspection decisive for used units.

Common failure points

• Partial discharge — PD in resin voids degrading insulation toward failure
• Resin cracking — Cracks from thermal cycling or mechanical shock
• Contamination — Dust and conductive debris enabling surface tracking
• Cooling fans — Failed AF fans derating capacity
• Connections — Loose terminations overheating under load
• Overheating under harmonics — Excess temperature on non-linear loads beyond K-rating

Inspection checklist

Partial discharge — PD test per IEC 60270 practice; readings above 10 pC warrant investigation on cast-resin coils Resin condition — inspect all coils per IEC 60076-11 practice for cracks and crazing from thermal cycling; any through-crack fails Insulation resistance — megger HV/LV/ground; polarization index of 2.0 or higher passes Turns ratio — TTR on all tap positions; deviation beyond 0.5% from nameplate fails Winding resistance — three-phase balance within 2% between phases Contamination — inspect for dust and conductive debris between coils; contamination is a leading dry-type failure driver Cooling fans (AF units) — run-test all fans and verify temperature controller setpoints Temperature sensors — verify RTD or thermocouple channels read within 5 C of a reference at ambient Connections — torque-check HV and LV terminations; thermal-scan at first energization and re-check within 12 months Clearances — verify electrical clearances and enclosure IP rating match the installation environment Class verification — confirm fire/environmental/climatic classes (F1, E2/E3, C2/C3) against nameplate Harmonic suitability — verify K-factor rating (K-4/K-13) against the intended non-linear load profile Core and frame — inspect for shipping damage and loose core bolts; verify single core ground Energization test — verify secondary voltage within 5% on all phases and no abnormal sound level Records — factory test certificate, PD test data, and service history; missing PD data reprices the unit

Procurement channels

Siemens Energy Grid Technologies sales for new; PS Auction, Machinio, and Machineseeker for used European units, all with gated or per-listing pricing.