Middle East Power Utility Company
Key Benefits
- End-to-end service
- Supplier flexibility
- Total technology expertise
- Reliance on trusted partner
Background
The original brief: to investigate a reported generator rotor vibration problem.
An inspection report supplied with the machine intimated that there was nothing wrong with the rotor. Cold dynamic balance tests were carried out by Quartzelec engineers which revealed that the vibration was caused by coil interturn shorts resulting in thermal bending.
The Project
The solution: to remove the coil retaining rings and field windings, renew the interturn insulation, rebuild the winding and refit the coil retaining rings.
Whilst the generator was disassembled, Quartzelec was asked to test and inspect the machine’s stator. The slot wedges were found to be loose, which would eventually lead to failure of the winding. As a result, Quartzelec manufactured a set of new slot wedges, designed to exceed existing OEM specification and the stator was re-wedged.
Quartzelec also assisted with re-rating the generator to run at a new supply of 11kV, 50Hz, as well as supplying, installing and commissioning a new generator control panel which included an automatic voltage regulator and excitation control, as well as supplying an excitation transformer, current transformers and a line isolating breaker
Outcome
“This project is a prime example of how customers can leverage Quartzelec’s total capability in rotating machines, its flexibility and project management expertise and the ability to ‘get on with the job’ wherever in the world it is located."
Mike Dawdry
Rotating Machines, Project Manager, Quartzelec’s Rugby Engineering.