Service · Major Overhaul
Industrial Generator Major Overhaul
Full-scope major overhaul of synchronous generators + turbogenerators 1-700 MVA: disassembly, NDT inspection, rewind (if needed), dynamic balance, dielectric testing, recommissioning. IEEE 56 + EASA AR100 + CFE LAPEM W4200-12.
Service overview
Industrial Generator Major Overhaul — what we deliver
Industrial generator major overhaul is the scheduled deep-intervention service applied every 5-8 years for base-load synchronous generators and 3-5 years for cycling units under IEEE 56 guidelines. Major overhaul opens the asset for full inspection + restoration: stator + rotor + core + excitation + cooling + bearings. As an independent multi-OEM workshop, TEMISA Power Gen executes major overhauls on any OEM brand under equivalent IEEE 56 + EASA AR100 standards — typically 30-50% cost vs OEM LTSA service.
Workshop capabilities
Technical scope
- Complete disassembly + parts cleaning + NDT inspection per IEEE 56
- Stator + rotor electrical rewind if dielectric testing indicates need
- Core ELCID test under IEC 60034-15 + lamination repair as needed
- Rotor + bearing inspection under API 670 + dynamic balance G2.5 ISO 21940
- Brushless excitation system diagnosis + component refurbishment
- Dielectric test package CFE LAPEM W4200-12 (full battery)
- Reassembly + alignment laser API 686 + final commissioning
- Documentation traceability ISO 9001:2015 for audit retention
Applications
Where we apply this service
Utility power plants (CFE base-load)
Scheduled overhauls every 5-8 years on base-load generators 100-700 MVA in CFE-owned thermal facilities.
Cogeneration off-season window
Sugar mills + paper + chemical plants schedule major overhauls during 4-6 month off-season window when production stops.
Combined-cycle IPP planned shutdown
Combined-cycle gas + steam IPPs schedule overhauls aligned with planned plant shutdowns (typically every 36 months).
Post-failure restoration to original spec
Following major failure event, restore generator to original commissioning specification with full CFE LAPEM W4200-12 certification.
Frequently asked questions
How often should a generator have a major overhaul?
Sector-dependent under IEEE 56 guidelines: utility base-load CFE 5-8 years / 40,000-60,000 hours. Cogeneration sugar mills + paper: 4-6 years + mandatory pre-harvest inspection. Refineries + petrochemical 3-5 years synced with plant turnaround. Hospitals NFPA 110: annual mandatory + 5-year major. Datacenters Tier III/IV: every 24-36 months per Uptime Institute. Cement + mining: 3-5 years due to abrasive operating environment.
What's the typical duration of major overhaul on a 200 MVA generator?
Full major overhaul on 200 MVA turbogenerator typically 10-14 weeks workshop including: disassembly (1-2 weeks), inspection + NDT (2 weeks), rewind if required (3-5 weeks), balance + reassembly (2-3 weeks), dielectric testing + commissioning (1-2 weeks). Add 4-6 weeks if stator full rewind is required. Field overhaul typically 30-50% longer due to logistics + temporary operation arrangements.
What's included in a full IEEE 56 major overhaul?
Full IEEE 56 overhaul scope: (1) Complete disassembly of rotor + stator + bearings + excitation; (2) NDT inspection: visual + magnetic particle + ultrasound on rotor + retaining rings; (3) Core test ELCID IEC 60034-15; (4) Electrical dielectric battery CFE LAPEM W4200-12: Megger 5/10 kV + IP + Tan Delta + DP + Hipot AC at 1.5×Un; (5) Stator + rotor rewind if dielectric indicates degradation (typical every 2nd-3rd overhaul); (6) Dynamic balance G2.5 ISO 21940; (7) Reassembly + alignment laser API 686 + recommissioning under IEEE 115. Total scope ~3,500-5,000 documented activities for traceability ISO 9001:2015.
Other services
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Contact
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Response within 24 hours. Formal quote within 48 hours. 24/7 emergency support across Mexico and Central America.
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CFE LAPEM W4200-12 · ISO 9001:2015 · IEEE / IEC