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Media / Application stories / Together for a smart and trustworthy power supply

Together for a smart and trustworthy power supply


For many years Atlas Copco Rental has been supporting Nyrstar Budel, the only zinc producer in the Netherlands, with temporary power supplies.

This time, we have been confronted to a new challenge: a temporary supply during the maintenance and inspection of a transformer as well as a motor control center room. For this job some power sources had to be shut down, however, a direct online water pump with a 160kW required power supply had to remain in operation.

The solution: two QAS500 generator sets

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In the past, a 1000kVA generator (QAC1000) was used for the water pump, in order to intercept the high starting current and guarantee the continuous operation of the machine.

This time Atlas Copco Rental came up with an even better solution: two QAS500 in a parallel arrangement. This way the water pump could easily be started, even though the high starting current. Once in operation and the starting current decreases to a nominal capital, one generator could be shut down.

The temporary power supply was constructed just 1 day before the execution, limiting labor costs for Nyrstar.

Jack van Hulten,  District Manager of Atlas Copco Rental, looks back on the job: ‘We instructed Nyrstar’s technical department during the construction so they could handle the generators  themselves. This made it simple for them to synchronize the 2nd generator and start it safely. This synchronization was executed in a 100% automated manner by the QC4002 control unit, standard on QAS500. Also the load sharing is controlled by this unit, resulting in a 50/50 distribution of the load between the generators.’

Han Hermans of Nyrstar sees a big advantage in the parallel operation of the two QAS500 sets: “If anything occurs with one of the units, the other set automatically takes over without any power interruption. This offered certainty during the operations, especially since we had to completely disconnect the main power supply!.”

Moreover the possibility to shut down and restart the units easily and fast ensured significant fuel savings. An extra saving was on transport and handling: QAS500 units are lighter than QAC1000 container set.

For Han Hermans the proposed solution was a perfect match to Nyrstar’s demand : “Atlas Copco Rental has been a constructive partner and delivered exactly what we needed for this project, both technically and budgetary. This definitely offers a perspective for future projects.”

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Atlas Copco is an industrial group with world-leading positions in compressors, expanders and air treatment systems, construction and mining equipment, power tools and assembly systems. With innovative products and services, Atlas Copco delivers solutions for sustainable productivity. The company was founded in 1873, is based in Stockholm, Sweden, and has a global reach spanning more than 170 countries. In 2012, Atlas Copco had 39 800 employees and revenues of BSEK 90.5 (BEUR 10.5).
Specialty Rental is a division within Atlas Copco’s Compressor Technique business area. It serves customers in various industry segments around the world with temporary air, steam, nitrogen and power rental solutions. The specialty rental services are offered under several brands. The divisional headquarter is located in Houston, USA.