Precision Industries chooses Nidec Leroy-Somer alternator

When UAE Dubai-based Precision Industries (PI) won a bid for a very high capacity – 3000 kVA  – generating set for a diversified and integrated group of energy companies in Abu Dhabi, it turned to Nidec Leroy-Somer for the perfect alternator.

As a leading manufacturer of diesel power generating sets, PI has been working with Nidec Leroy-Somer as an OEM for other projects, and instinctively knew it could rely on Nidec Leroy-Somer to supply the required alternator.

The project site, an onshore oil and gas installation located in Abu Dhabi, UAE, has an ambient temperature range up to 55°C and high humidity above than 95%, and is also marred by sandstorms. The requirement was for three customised generating sets of varying power capacity with tight delivery schedules.

The power generation requirement for the largest of these three units is 3000 kVA prime rated generating set with 10% over loading – a 3300V, 50Hz, IP55 alternator with a matching prime mover mounted in a totally enclosed, within customized heavy-duty enclosure (IP55). The current and voltage transformers used in this generator are equipped with highly advanced protection including differential protection (Class PX), restricted earth fault protection and short circuit protection, advanced digital AVR and customised terminal boxes to accommodate oversized armoured power cables.

Engineers at Nidec Leroy-Somer studied the requisition for the customised alternator, and after detailed deliberation with PI and the end user it finalised the design. Once built, the alternator was subjected to the factory acceptance test at the Nidec Leroy-Somer works in France, on a unique special test platform, where it was subjected to a closed loop test at full load. The acceptance test was witnessed by customer representatives and other parties. The Nidec Leroy-Somer alternator was then shipped to UAE for the assembly of the generating set.

“This is alternator not something that many companies can deliver,” says Nawar Shubbar of Nidec Leroy-Somer. “We are proud that Nidec Leroy-Somer is one of the few companies who can meet such stringent specifications for an alternator. This also applies to Precision Industries, who then took over the job and put in a lot of effort in integrating the alternator in the generator set. There is a huge amount of engineering that has gone into this project.”