Service · Major Overhaul
Industrial Generator Major Overhaul
Full-scope major overhaul of synchronous generators + turbogenerators from 1 to 365 MVA: disassembly, NDT inspection, rewind (if needed), dynamic balance, dielectric testing, recommissioning. IEEE 56 + EASA AR100.
Service overview
Industrial Generator Major Overhaul — what we deliver
Industrial generator major overhaul is the scheduled deep-intervention service, at intervals set with the manufacturer's recommendations, operating hours, duty cycle and diagnostic results. 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 — at a significantly lower total cost than the OEM LTSA contract.
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 (methodology documented in CIGRE TB 257, acceptance criteria agreed in the protocol) + 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 (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 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 documented acceptance tests.
Frequently asked questions
How often should a generator have a major overhaul?
There is no universal interval: IEEE 56 is a general insulation-maintenance guide and does not set a fixed overhaul period. The interval is set with the manufacturer's recommendations, operating hours, duty (base-load, cycling, plant turnaround or harvest season), operating environment (abrasive dust in cement and mining) and diagnostic results. Emergency generators also follow the periodic testing program required by NFPA 110.
What's the typical duration of major overhaul on a 200 MVA generator?
Timeline is set after diagnosis: scope (stator, rotor or both), core condition, materials and parts lead times, logistics and outage window. It is confirmed in writing in the proposal. A major overhaul covers disassembly, inspection and NDT, rewind if required, balance and reassembly, and dielectric testing and commissioning.
What's included in a full major overhaul?
Typical full overhaul scope (IEEE 56 as general reference guide): (1) Complete disassembly of rotor + stator + bearings + excitation; (2) NDT inspection: visual + magnetic particle + ultrasound on rotor + retaining rings; (3) Core test ELCID (methodology per CIGRE TB 257, acceptance criteria agreed in the protocol); (4) Electrical dielectric battery: Megger 5/10 kV + IP + Tan Delta + DP + Hipot AC at the voltage and duration defined in the protocol; (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 with IEEE 115 acceptance tests. Total scope ~3,500-5,000 documented activities for traceability ISO 9001:2015.
Other services
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Contact
Need service for your industrial generator or turbogenerator?
Response and quote timing confirmed after reviewing your request. Emergency support by arrangement across Mexico and Central America.
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+52 33 3614 2460Quote requests
ventas@temisapowergen.mxService hours
Emergency support by arrangement
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ISO 9001:2015 · IEEE / IEC