Service · Rehabilitation
Rehabilitation and Life Extension of Industrial Generators
When replacing a legacy generator is unviable — by cost, lead time or OEM obsolescence — TEMISA Power Gen rehabilitates the unit with electromagnetic redesign, class F/H insulation upgrade, brushless or static excitation retrofit, digital AVR replacement and control modernization. Service for synchronous generators, turbogenerators and hydrogenerators under CFE LAPEM W4200-12 and current IEEE/IEC standards across Mexico, the United States and Central America.
Modernization · Repowering · Life Extension 15-25 years
IEEE 95/115IEEE 421IEC 60034ISO 9001:2015CFE LAPEM W4200-12Service overview
What a generator rehabilitation includes
Every rehabilitation starts with a quantitative technical assessment — current condition of stator core, windings, rotor body, excitation system and mechanical interfaces; recommended scope; estimated cost; expected service horizon after intervention. The client decides which depth to attack with full data in hand.
- Upgrade of stator and rotor insulation to class F/H with modern epoxy resins
- Full or partial rewind of stator and rotor windings with certified copper
- Excitation system retrofit: brushless, static, or digital AVR replacement
- Modernization of control, protection and metering — numerical relays
- Restacking of magnetic cores and replacement of slot wedges and pressure fingers
- Heavy machining: shafts, bearing housings, end-shield seats, journals
- Borescope diagnostic and technical assessment before any scope is locked
- Functional testing and acceptance under current IEEE 95/115 and IEC 60034
When to apply it
Scenarios where rehabilitation outperforms replacement
Utilities, EPCs and plant managers operating legacy fleets face a recurring decision: replace the unit with a new machine on a long lead time, or rehabilitate the existing asset and recover 15 to 25 years of service life. The right call depends on measured condition and on the total cost of each path.
- Legacy fleet 20 to 40 years old where the OEM no longer supports the platform
- Total replacement budget unviable — rehabilitation runs 30 to 50% of new
- Need for additional active power without replacing the prime mover
- Excitation system obsolete: rotary diodes, analog AVR, no spare parts
- Insulation degradation under thermal class B/F that can be upgraded to F/H
- Stable grid code compliance gaps — modern AVR and digital governor required
Standards and certifications
Standards we apply to rehabilitation projects
Every intervention is documented under ISO 9001:2015 with full traceability by work-order number. Acceptance protocols follow current IEEE and IEC standards — the rehabilitated unit is released to operation with the same documentation rigor as a new machine.
- IEEE 95-2002 — Insulation testing of generators with HV direct current
- IEEE 115 — Test procedures for synchronous machines
- IEEE 421 — Excitation system models for power system stability
- IEC 60034-1 — Rotating electrical machines: rating and performance
- IEC 60034-3 — Specific requirements for synchronous generators
- IEC 60034-16 — Excitation systems for synchronous machines
- ISO 9001:2015 — Quality management system
- CFE LAPEM W4200-12 — Generators 1 to 100 MVA
Why TEMISA Power Gen
Six differentiators for generator rehabilitation
CFE LAPEM W4200-12 certified workshop — generators 1 to 100 MVA
In-house Tlajomulco workshop with 60-ton crane and heavy machining
Independent multi-OEM — Brush, Siemens, GE, Toshiba, ABB, Jeumont, WEG, Stamford
Engineering team evaluates rehabilitate-vs-replace trade-off with quantitative data
Recovery of generators competitors declare a total loss when ELCID supports it
ISO 9001:2015 traceability per work-order number across Mexico and Central America
Related services
Services frequently combined with rehabilitation
Service
Stator and rotor rewind
Full rewind under CFE LAPEM W4200-12 with class F/H insulation, certified copper and vacuum impregnation. Most rehabilitation projects include rewind as core scope.
See serviceService
Repair of magnetic cores
Diagnostic and repair of shorted laminations, hot spots and core damage in stator cores under IEEE 56 — prerequisite before any rewind on a degraded core.
See serviceService
Commissioning and acceptance
Re-commissioning under IEEE 115 with hipot, surge comparison and synchronization to grid after rehabilitation. Acceptance package signed and traceable.
See serviceRelated equipment
Equipment we rehabilitate
Reference case
Brushless excitation retrofit on a 30-year hydroelectric generator
+15 yr
Service life extended
Digital AVR
Excitation modernized
IEEE 421
Compliance recertified
Replacement of legacy rotary excitation system with new brushless excitation and digital AVR on a hydroelectric generator with 30 years of continuous operation. Operational recertification under IEEE 421 and IEC 60034-16. Extended service life by more than 15 years versus the cost and lead time of a full replacement unit. Documentation package signed under ISO 9001:2015 traceability.
FAQ
Frequently asked questions — Generator rehabilitation
Preguntas que recibimos con frecuencia. ¿No encuentras la tuya? Escríbenos a ventas@temisa.mx.
When is rehabilitation a better choice than replacing the generator?
Rehabilitation makes economic sense when total cost runs around 30 to 50 percent of a new unit, when delivery time for a new machine is 18 to 24 months versus 6 to 12 months for rehabilitation, or when the original OEM no longer supports the platform. The technical assessment we deliver compares both scenarios with quantitative data — copper losses, insulation condition, core integrity, excitation obsolescence — before the client commits to a path.
Can you retrofit the excitation system to brushless or static AVR?
Yes. We retrofit legacy rotary excitation systems to modern brushless or static excitation with digital AVR under IEEE 421 and IEC 60034-16. The upgrade improves transient stability, eliminates brush maintenance on brushless platforms, and brings the unit into compliance with current grid codes for primary frequency response and reactive power control.
How much additional lifespan does a complete rehabilitation deliver?
A complete rehabilitation — class F/H insulation upgrade, full rewind, excitation retrofit, control modernization, machining of critical mechanical components — typically delivers 15 to 25 additional years of service life when the underlying magnetic core is sound. The technical assessment quantifies the expected service horizon based on measured condition of stator core, rotor body and shaft geometry.
Do you rehabilitate both salient-pole and round-pole rotors?
Yes. We rehabilitate salient-pole rotors typical of hydroelectric and slow-speed synchronous generators, and round-pole (cylindrical) rotors typical of turbogenerators at 1,800 and 3,600 RPM. The methodology adapts to pole geometry — pole reconditioning, damper winding repair, rotor body inspection and dynamic balancing under ISO 21940 are scoped accordingly.
Can rehabilitation increase the nameplate rating of the generator?
Yes, within the limits of the magnetic core and the prime mover. Electromagnetic redesign with class F/H insulation allows additional copper cross-section in the slots and higher current density — typically a 5 to 15 percent rating increase without modifying core geometry. Larger uprates require core extension or replacement and are evaluated case by case.
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CFE LAPEM W4200-12 · ISO 9001:2015 · IEEE / IEC