Sector · Thermal Power
Generator Service for Thermal Power Plants and Combined Cycle
Combined cycle and thermoelectric plants operate turbogenerators in the 50 to range under tight major-outage windows, OEM warranty interfaces and grid code obligations. TEMISA Power Gen serves combined cycle gas turbine generators, steam turbogenerators and large synchronous generators with major overhaul, stator rewinding, ELCID and RSO testing and IEEE 115 commissioning. documentation.
Combined Cycle · Steam · Gas Turbine
IEEE 115IEEE 95IEC 60034Industry challenges
What thermal power operators are solving today
A combined cycle or thermoelectric plant has hard outage windows where every hour of overrun has a contractual cost with the offtaker. Turbogenerator work has to fit inside the plant outage schedule, satisfy OEM warranty criteria and document compliance with grid code.
- Major overhaul windows of 30 to 60 days where every hour of overrun has a contractual cost
- Hydrogen-cooled generators with seal oil systems, gas purity monitoring and rotor end-winding inspection
- Stator core lamination integrity audited under ELCID before reassembly
- Rotor retaining ring inspection — material identity, NDT and fitness-for-service evaluation
- Partial discharge monitoring on stator end windings to track insulation aging
- Grid code compliance — synchronization, reactive capability, voltage step response
- OEM warranty interface where independent workshop work must satisfy OEM acceptance criteria
Why TEMISA Power Gen
Six differentiators for thermal power operations
Turbogenerator service in shop and field — major overhaul, stator rewind, rotor service
— documentary traceability for utility and OEM audits
Multi-OEM capability — GE, Siemens, Mitsubishi, Toshiba, ABB, Hitachi and Brush BDAX turbogenerators
IEEE 115 acceptance testing protocol with load bank, vibration and waveform documentation
Specialty testing in shop and field: ELCID, RSO, partial discharge online, Hipot AC/DC, polarization index
Coordination with steam turbine OEM and balance-of-plant teams during the major overhaul window
Equipment we serve
Typical equipment in thermal power plants
Equipment
Combined cycle turbogenerators
Gas turbine and steam turbine generators in combined cycle configurations. Major maintenance, stator rewind and IEEE 115 acceptance testing.
See equipmentEquipment
Thermoelectric steam turbogenerators
Steam turbogenerators in conventional thermoelectric plants. In-shop and field service.
See equipmentEquipment
Synchronous generators for power generation
Synchronous generators for thermal plants — stator and rotor service, rewinding and rehabilitation under Class F/H insulation.
See equipmentKey services
Priority services for thermal power
Service
Major maintenance and overhaul
Full turbogenerator overhaul during the planned outage window. Rotor extraction, stator inspection, retaining ring NDT and reassembly with IEEE 115 acceptance.
See serviceService
Commissioning and acceptance testing
Commissioning of new turbogenerators and post-overhaul acceptance testing under IEEE 115 with load bank, vibration and waveform documentation.
See serviceService
Stator rewind
In-shop or in-situ rewind of turbogenerator stators with Class F/H insulation and VPI impregnation.
See serviceService
Electrical testing — ELCID, RSO, PD, Hipot
ELCID stator core test, RSO rotor test, partial discharge monitoring, Hipot AC/DC and polarization index testing.
See serviceService
Rehabilitation and life extension
Turbogenerator rehabilitation programs for aging thermal plants. Class F/H upgrade, core repair and rotor retaining ring replacement.
See serviceStandards applied
Standards we apply to thermal power work
Every intervention is documented in a format compatible with OEM warranty audits, plant outage records and grid code compliance. 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 522 — Surge withstand test on stator windings
- IEC 60034-1 — Rotating electrical machines: rating and performance
- IEC 60270 — Partial discharge measurements
- — Quality management system
- ISO 10816 — Mechanical vibration evaluation of machines
Illustrative example
Not a published project record.
Major overhaul of a combined cycle turbogenerator with ELCID and RSO testing
ELCID + RSO
Method
IEEE 115
Acceptance reference
Scope by findings
Option evaluated
On a combined cycle turbogenerator, a major overhaul can include rotor extraction, retaining ring inspection, an ELCID stator core test, an RSO inter-turn diagnostic and Hipot AC/DC testing, with field and shop work coordinated with the plant outage manager. The IEEE 115 acceptance protocol is run before grid synchronization.
FAQ
Frequently asked questions — Thermal power generator service
Questions we often receive. Can't find yours? Email us at ventas@temisapowergen.mx.
Up to what MVA capacity do you service turbogenerators?
We service turbogenerators on site within our 1 to 365 MVA range, and in the shop depending on component weight and dimensions. This includes combined cycle gas turbine generators, steam turbogenerators in thermoelectric plants and large industrial cogeneration units.
Do you service hydrogen-cooled turbogenerators?
Yes. Hydrogen-cooled generators require additional precautions during outage: gas purging procedures, seal oil system inspection, hydrogen purity verification during fill and gas dryer service. We follow OEM-specific hydrogen handling procedures plus IEEE 502 guidance for hydrogen-cooled generator maintenance.
Do you perform stator core integrity tests under ELCID?
Yes. ELCID (Electromagnetic Core Imperfection Detection) is part of our standard major overhaul protocol for turbogenerator stators. The test is run at low flux (4% nominal) and identifies interlaminar shorts in the stator core before reassembly. Results are reported as a quadrature current heat map for direct comparison against baseline.
Do you inspect rotor retaining rings during overhaul?
Yes. Retaining ring inspection is part of every major rotor overhaul: material identification (18Mn-5Cr versus 18Mn-18Cr), NDT for stress corrosion cracking, dimensional check and fitness-for-service evaluation per OEM criteria or industry guidance. Replacement coordinated with OEM where required.
Can you coordinate with the steam turbine OEM during overhaul?
Yes. We routinely coordinate generator work with steam turbine OEM crews, valve overhaul contractors and balance-of-plant teams during the major outage window. Generator outage scope and milestones are aligned to the plant outage schedule so the turbogenerator is ready for the steam turbine recoupling on the contractual date.
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)
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· IEEE / IEC