Exploration • Drilling • Field Services
Rapid repairs to a high voltage generator rotor were carried out in just eight weeks.
Se llevaron a cabo reparaciones rápidas en el rotor del generador de alta tensión en tan solo ocho semanas.
In nur acht Wochen wurden schnelle Reparaturen am Rotor eines Hochspannungsgenerators vorgenommen.
I
Fig. 1. When regular maintenance checks on a high voltage 60MW generator at a large oil refinery signalled a potential earth fault in the rotor Sulzer carried out the repair and subsequent testing.
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Rapid repair saves refinery downtime
n the power generation business, speed is of the essence, especially for maintenance work that can result in generating capacity downtime. When it is the generator’s rotor itself that
needs repairing, the timing of the steps toward resuming normal output is crucial. When regular maintenance checks on
a high voltage 60MW generator at a large oil refinery signalled a potential earth fault in the rotor, engineers were keen to have a repair completed as soon as possible. Sulzer specialises in delivering rapid
repairs to high voltage equipment and was able to offer an efficient, bespoke service to repair the rotor in just eight weeks. Sulzer operates manufacturing and testing facilities located throughout the world, so is able to provide a global turnkey service to keep power plant generation capacity in operation.
Inspection report Sulzer worked in partnership with the client to quickly identify a solution and formulate a plan of action for the repair of
the rotor. Sulzer provided a comprehensive inspection report and quote to overhaul the rotor within the constricted deadline. With lost production costs looming, the plan was put into action. Te rotor was shipped from Italy to the Birmingham Service Centre site, where work began on the initial strip down. In a project such as this it is frequently possible to reuse the rotor’s retaining rings, provided they are in satisfactory condition. However, detailed inspection following the strip down revealed that in this case they would have to be replaced. To provide a fast track solution for the client, minimising site downtime costs, Sulzer was able to produce a set of replacements for the vented 800mm diameter stainless steel rings utilising its established materials supply network and in-house large precision machining facility. In many cases rotor windings can also
be reused, having first cleaned them and reapplied the insulation. However, in this instance, reuse was not possible and so
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