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 from 1 to 365 MVA for utilities, IPPs and mini-hydro operators with rewinding, rehabilitation, AVR retrofit (IEEE 421) and IEEE 115 acceptance testing.
Run-of-river · Reservoir · Mini-hydro
IEEE 115IEEE 421IEC 60034Industry 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
— 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 with Class F insulation and VPI impregnation
Equipment we serve
Typical equipment in hydropower plants
Equipment
Vertical hydrogenerators
Vertical hydrogenerators from 1 to 365 MVA for Francis, Kaplan and Pelton plants. Major maintenance, stator rewind and rotor pole rewinding.
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.
See serviceService
Stator rewind
Stator rewind in shop or on site, with Class F insulation and VPI impregnation.
See serviceService
Salient pole rewinding
Rewinding of salient pole rotor coils, rim repair, retaining ring inspection and dynamic balancing for hydrogenerators.
See serviceService
Rehabilitation and life extension
Hydrogenerator rehabilitation programs for aging plants. Class F insulation upgrade, core repair and AVR retrofit under IEEE 421.
See serviceService
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 with document traceability.
- 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
- — Quality management system
- ISO 10816 — Mechanical vibration evaluation of machines
- ISO 19283 — Hydroelectric plant condition monitoring
Illustrative example
Not a published project record.
Salient pole rewinding and AVR retrofit for a vertical hydrogenerator
Class F
Insulation to evaluate
IEEE 421
AVR reference guide
Pole rewind + AVR retrofit
Option evaluated
On a vertical hydrogenerator, a major overhaul can include salient pole rewinding, a Class F insulation upgrade and an AVR retrofit under IEEE 421. Disassembly is coordinated with the hydraulic outage calendar, and IEEE 115 acceptance tests are run before grid synchronization; the final scope depends on the pole and stator diagnosis.
FAQ
Frequently asked questions — Hydropower generator service
Questions we often receive. Can't find yours? Email us at ventas@temisapowergen.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 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 with document traceability.
What MVA range do you support for hydrogenerators?
We service hydrogenerators from 1 to 365 MVA, from mini-hydro to large hydroelectric plants.
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.
Insulation condition
Build on your generator diagnostics
Partial discharge campaigns, instrumentation and asset monitoring. Define the scope around your operation.
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.
Quote requests
ventas@temisapowergen.mxDirect line
+52 33 3614 2460Shop hours
Monday to Friday 8:30–17:30 and Saturday 8:30–13:30 (closed Sunday)
Get a quote in 4 steps
Tell us what you need
Our 4-step quote form captures the essentials: service type, equipment, capacity and contact. Response and quote timing depend on the information received and agreed scope.
· IEEE / IEC