Sector · Hydropower
Hydrogenerator Service for Hydropower Plants
Hydropower plants in Mexico and Central America operate aging hydrogenerator fleets where insulation life, salient pole integrity and excitation system obsolescence are the daily operational concerns. TEMISA Power Gen serves vertical and horizontal hydrogenerators 1 to 100 MVA for utilities, IPPs and mini-hydro operators with rewinding, rehabilitation and AVR retrofit under CFE LAPEM W4200-12, IEEE 115, IEEE 421 and IEC 60034.
Run-of-river · Reservoir · Mini-hydro
IEEE 115IEEE 421IEC 60034ISO 9001:2015CFE LAPEM W4200-12Industry challenges
What hydropower operators are solving today
Most installed hydrogenerators in Mexico and Central America are 40 to 70 years old. Insulation, salient pole rotors, excitation and bearings are at the end of their original design life and require rehabilitation or rewinding to extend service for another two decades.
- Aging hydrogenerator fleets — many plants are 40 to 70 years old with insulation life nearing exhaustion
- Salient pole rotors with mechanical stress concentrated in pole-to-rim attachments and pole face windings
- Long shutdown windows during dry season — hydraulic, electrical and mechanical work concurrent
- Remote plant access where every spare part and field crew is a logistics project
- Excitation system obsolescence — analog regulators replaced by digital AVRs under IEEE 421
- Hydraulic vibration coupling into the generator — bearings, shaft alignment and rotor balance
- CFE, CRE and Central America regulator audits for plant rehabilitation and life extension
Why TEMISA Power Gen
Six differentiators for hydropower operations
Specialists in salient pole rotors — pole rewinding, rim repair, retaining ring inspection and dynamic balancing
CFE LAPEM W4200-12 plus ISO 9001:2015 — documentary traceability for utility and regulator audits
Multi-OEM capability — GE, Siemens, ABB, Toshiba, Mitsubishi, Hitachi, Voith, Andritz and other hydrogenerator manufacturers
IEEE 421 retrofit experience — analog AVR upgrade to digital excitation with PSS where applicable
Field crews mobilized for remote hydro sites in Mexico and Central America with documented logistics
In-shop capacity for stator rewinding and core repair under CFE LAPEM W4200-12 with Class F insulation and VPI impregnation
Equipment we serve
Typical equipment in hydropower plants
Equipment
Vertical hydrogenerators
Vertical hydrogenerators 1 to 100 MVA for Francis, Kaplan and Pelton plants. Major maintenance, stator rewind and rotor pole rewinding under CFE LAPEM W4200-12.
See equipmentEquipment
Horizontal hydrogenerators
Horizontal hydrogenerators for low-head and bulb turbine applications. In-shop overhaul and field service for mini-hydro plants.
See equipmentEquipment
Excitation systems
AVR and excitation system retrofit under IEEE 421. Analog-to-digital upgrade with PSS where dynamic stability requires it.
See equipmentKey services
Priority services for hydropower
Service
Major maintenance and overhaul
Full hydrogenerator overhaul during dry-season outage. Stator and rotor inspection, bearing service, alignment and acceptance testing under IEEE 115.
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Stator rewind
In-shop rewind of hydrogenerator stators under CFE LAPEM W4200-12 with Class F insulation and VPI impregnation. Capacity up to 100 MVA.
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Salient pole rewinding
Rewinding of salient pole rotor coils, rim repair, retaining ring inspection and dynamic balancing for hydrogenerators.
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Rehabilitation and life extension
Hydrogenerator rehabilitation programs for aging plants. Class F insulation upgrade, core repair and AVR retrofit under IEEE 421.
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Electrical testing
Megger, polarization index, RSO rotor test, ELCID core test, partial discharge and Hipot testing on hydrogenerator stator and rotor.
See serviceStandards applied
Standards we apply to hydropower work
Every intervention is documented in a format compatible with utility audits and OEM warranty programs where applicable. Full traceability by work-order number under ISO 9001:2015.
- IEEE 115 — Test procedures for synchronous machines
- IEEE 95 — Insulation test of generators with HV direct current
- IEEE 421 — Excitation system models and performance
- IEC 60034-1 — Rotating electrical machines: rating and performance
- ISO 9001:2015 — Quality management system
- ISO 10816 — Mechanical vibration evaluation of machines
- ISO 19283 — Hydroelectric plant condition monitoring
- CFE LAPEM W4200-12 — Generators 1 to 100 MVA
Reference case · Hydro rehabilitation
Salient pole rewinding and AVR retrofit for a vertical hydrogenerator
1-100
MVA range supported
Class F
Insulation upgrade
IEEE 421
AVR retrofit
Major overhaul of a vertical hydrogenerator with salient pole rewinding, Class F insulation upgrade and AVR retrofit under IEEE 421. Field disassembly coordinated with the hydraulic outage calendar, rotor and pole coils routed to the workshop for rewinding under CFE LAPEM W4200-12, reassembly and IEEE 115 acceptance test before grid synchronization.
FAQ
Frequently asked questions — Hydropower generator service
Preguntas que recibimos con frecuencia. ¿No encuentras la tuya? Escríbenos a ventas@temisa.mx.
Do you rewind salient pole rotors for hydrogenerators?
Yes. Salient pole rewinding is one of our core capabilities. We rewind pole coils with Class F insulation, repair rim attachments, inspect retaining rings and dynamically balance the rotor before reassembly. The complete process is documented under CFE LAPEM W4200-12 with field witness or in-shop acceptance protocol per the client's preference.
Can you retrofit analog AVRs to digital excitation systems?
Yes. We have experience replacing legacy analog automatic voltage regulators with digital AVR platforms compliant with IEEE 421.5 (excitation system models). The retrofit includes commissioning, parameter tuning and acceptance testing with grid step-response documentation. Where applicable, we add a Power System Stabilizer (PSS) for dynamic stability.
Do you work in remote Central American hydro plants?
Yes. We have documented service experience in hydro plants in Guatemala, Honduras and Costa Rica. Field crews are mobilized with in-country logistics for lodging, transport and customs clearance for tools and instruments. Reporting in English or Spanish under ISO 9001:2015.
What MVA range do you support for hydrogenerators?
We service hydrogenerators from 1 MVA (mini-hydro) up to 100 MVA (large reservoir plants) under CFE LAPEM W4200-12. For larger units, we coordinate with the OEM or partner workshops for hot-spots that require specific OEM tooling, with TEMISA Power Gen acting as integrator.
Do you support hydraulic-induced vibration analysis?
Yes. We perform vibration analysis under ISO 10816 to differentiate hydraulic-induced vibration (vortex, rough load, hydraulic resonance) from mechanical-electrical vibration (rotor unbalance, shaft misalignment, electromagnetic forces). The diagnostic report identifies the root cause and recommends corrective action coordinated with the hydraulic and civil teams.
Contact
Need service for your industrial generator or turbogenerator?
Response within 24 hours. Formal quote within 48 hours. 24/7 emergency support across Mexico and Central America.
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Our 4-step quote form captures the essentials: service type, equipment, capacity and contact. Response in less than 24 hours, formal quote within 48.
CFE LAPEM W4200-12 · ISO 9001:2015 · IEEE / IEC