Sugar mill alternator rewind

2nd Quarter 2016 News & events

Marthinusen & Coutts recently performed a rush job for sugar producer, Tongaat Hulett, to repair the rotor of the 20 MW salient pole synchronous alternator at its Xinavane mill in Mozambique. The complex task was carried out at the company’s Cleveland, Johannesburg, facility in just over three months. It involved a complete rewind of the rotor, which had a cruciform-type winding configuration.

“The task was complicated by the need to redesign the winding and insulation,” explains general manager, Craig Megannon. “The original coil had developed a fault because it had been vacuum pressure impregnated, which by forming it into a solid block caused differential expansion between the copper windings and the steel of the rotor body. We solved this problem by introducing thicker insulation and thinner copper windings, which were neither vacuum pressure impregnated nor glued to the pole body. This achieved the desired result, as proven by the tests we carried out on the rotor windings on completion of the job.” With 57 years of extensive experience in local and global markets, Marthinusen & Coutts undertakes electrical and mechanical repairs, overhauls and complete refurbishments.

For more information contact Richard Botton, Marthinusen & Coutts, +27 (0)11 607 1700, [email protected], www.mandc.co.za

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