Sugar mill alternator rewind

June 28th, 2016, Published in Articles: Energize


Xinavane mill in MozambiqueMarthinusen & Coutts recently repaired the rotor of the 20 MW salient pole synchronous alternator at Tongaat Hulett’s Xinavane mill in Mozambique. The task, which involved the complete rewind of the rotor, with a cruciform-type winding configuration, was carried out at the company’s Cleveland, Johannesburg facility in just over three months. Craig Megannon, the company’s general manager, says the job was complicated by the need to redesign the winding and insulation. The original coil had developed a fault, and because it had been vacuum pressure impregnated which formed it into a solid block, it caused a differential expansion between the copper windings and the steel of the rotor body. Thicker insulation and thinner copper windings, which were neither vacuum pressure impregnated nor glued to the pole body, were used in the rewind. The company has 57 years experience in local and global markets, undertaking electrical and mechanical repairs, overhauls and complete refurbishments.

Contact Richard Botton, Marthinusen & Coutts, 011 607 1700,

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