Renewable Energy and Co-Generation

Originally comprised of five pressure-fed mills powered by single-stage turbines, each mill had set-ratio gear-driven pressure feeders powered by the turbines. In order to improve capacity and extraction performance, the first and last mill pressure feeders were converted to independent drives that included variable speed electric AC motors and gearboxes.

i.power solutions worked in conjunction with Isis Central Sugar Mill to remove the turbines from each mill, modify the existing foundations and drive plinths to accommodate new electric motors and gearboxes. As Principal Contractor for the Isis Milling Train Electrification, i.Power's role also encompassed the design, manufacture, supply, installation and commissioning of the following equipment:

Two 3500 kVA, 11kV/690 V phase-shifted drive transformers Mill crushing unit variable speed drives, motors and gearboxes with power ratings from 185 to 710 kW. 690 V switchroom, 690Vac motor control centre and local control and indication panels All auxiliary equipment including gearbox lubrication systems Civil concrete works including foundations and drive plinths Expertise in process tuning related to drive configuration

i.power solutions' experience with milling train electrification within the sugar industry was acknowledge following the success of similar projects undertaken in Fiji and Bundaberg (as outlined below). This is also supported by proven expertise in electrical switchgear, VVVF drive application and switchroom construction. The Isis Milling Train Electrification is not only an example of the application of energy efficient technologies, but also of the proven and continuing development of i.power solutions professional capabilities in this area.

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