12.7MW, 13,800Volts, HV motor seen here recently removed from location and back-loaded to TDC Parsons Peebles for inspection & major overhaul.
Specification: 13.8kV, 60Hz, 644 Amps, 1,775 RPM, 12.7MW
Scope: Motor removed from situ and dispatched to TDC Parsons Peebles workshop. Initial no load tests and vibration signatures recorded prior to dismantling to component level. Subsequent inspection – Full QA checks carried out to all components and findings reported in advance of major overhaul.
Summary of work-scope conducted:
Initial Dismantling & Inspection
Issue complete report detailing full work scope – advising client of the mechanical repairs identified during cleaning & inspection process.
Inspection of bars, short circuit rings and core laminations
Record lamination geometry
Set up rotor, carry out full TIR
Manufacture/supply new set of laminations & pressure plates
Manufacture new set of rotor bars & rotor slot wedges
Build new rotor core and fit onto shaft, secure and conduct full TIR
Fit and secure new rotor bars, machine wedges
Fit new short circuit rings
NDT testing of new joints
Set up and balance rotor
Carry out final TIR checks on concentricity
Record stator lead geometry
Detailed inspection of all; blocking, bracing and coil wedging for migration
Full electrical static checks
Set up stator & conduct power flux test & record thermal images
Steam clean and stove stator windings
Clean off all excess vanish after process and prepare for rebuild
Inspect DE & NDE bearings and labyrinth seals
Examine cooler / tubes / inlet and outlet facade plates / float switches
Inspect condition of air circuit / fan / diffuser
Inspect and advise coupling condition / deformation of location centres
Check condition of all temperature / bearing probes
Inspect HV terminal box, spouts, pins and insulators
Examine purge unit assembly
Check condition of motor feet / flange location to shaft run out as BS
Check condition of air RTDS & bearing RTDS
Examine internal frame heaters
Rebuild and Test
Assemble motor complete
Set motor in test area and conduct running test
Prepare for shipment ready for installation
TDC Parsons Peebles site commissioning engineers installed, conducted final electrical tests and commissioned the motor prior to returning to service.
With the addition of Parsons Peebles Generation, TDC are now fully equipped to repair, re-work, overhaul and re-certify LV/MV/HV electric motors and generators; providing comprehensive onshore, offshore and overseas technical support.
Marine, ATEX/IECEx/UL certified and non-certified Electric Motors, Generators and Auxiliaries. Condition Monitoring services include; HV Partial Discharge and Motor Current Signature Analysis, Thermal Survey, Vibration Analysis & Laser Alignment. Experienced LV/MV/HV cable jointing engineers and specialist tooling also available.
To find out more about the full range of electrical & mechanical engineering services available at TDC, please have a read through the website, or contact the TDC Condition Monitoring Team at firstname.lastname@example.org or call +44 (0) 1224 710077.