Electricity + Control November 2017

Kirsten Larkan (Marketing Manager Zest WEG Group), Chris Watkins (Manager Drives and Automation, Zest WEG Group), Karen Grant (Publisher, Crown Publications and editor Lighting in Design), Francois Liebenberg (Sales Engineer Drives and Automation, Zest WEG Group), Coral Fraser (Coralynne & Associates), Wilhelm du Plessis (deputy publisher, Crown Publications, and editor Construction World), Munesu Shoko (editor Capital Equipment News), Tshima Mphaphuli (deputy editor, Sparks Electrical News).

This has been done in a user friendly manner to ensure ease of use and also allow simple access to relevant data. Moss says that the ability to extract the most relevant data and provide this in an intuitive and simplified format allows both operational and ser- vice personnel to monitor the requisite parame- ters. This project made use of a WEG MVW01 VSD with 6,6 kV output. The input solution makes use of a 36 pulse rectifier and corresponding phase shift transformer. Moss explains that this combina- tion was selected as the best option to minimise harmonics. Being part of the Zest WEG Group gives Shaw Controls, founded in 1981, access to the substan- tial technical database and engineering resources of parent company WEG Brazil. WEG itself has nu- merous references in terms of pre-manufactured substations – and Shaw Controls’ access to the expertise and experience of the Group gives it the ability to share technology and ensure best design practice. References [1] IEC 62271-200. 2002. High-voltage switchgear and controlgear – Part 200: Ac metal-enclosed switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV. [2] IEC 61439-1/2. 2011. Reference for the con- struction of electrical LV switchboards.

All these processes are guided by accredited ISO 9001 procedures to ensure the best quality. In ad- dition, Shaw Controls has implemented a projects and contracts team tasked to improve the custom- er experience and to assist in providing effective solutions.

Case study Containerised electrical solution – Gold mine inWest Africa

A containerised solution was recently supplied to supply power to drive a mill on a new gold mine in West Africa. Kirk Moss says that the custom en- gineered substation comprises an MV WEG VSD and a dry type phase shift transformer driving a 2 000 kW, 6 pole, 6,6 kV squirrel cage WEG elec- tric motor. The VSD is housed in the container while the oil cooled transformer is housed outside of it to facilitate heat dissipation. This solution un- derwent testing at Shaw Controls prior to being dispatched to site. “What is particularly interesting about the solu- tion provided is that it has been specifically engi- neered for this particular application and utilises specialised software for frozen charge protection,” Moss says. The software, which interfaces with the VSD, allows the objective detection of a frozen charge condition by making use of torque measurements already being monitored by the VSD. “With the addition of an encoder fitted to the electric motor, we are now able to monitor mill an- gle. And with the torque and angle measurements it is possible to detect if cascading has occurred within the mill,” he explains. Another innovative feature of this solution is the supply of a Human Machine Interface (HMI) in the form of an interactive touch screen which has been configured to allow different levels of access.

Enquiries: Kirsten Larkan Tel: +27 (0) 11 723 6000 Email: marketing@zestweg.com Web: www.zestweg.com

Electricity + Control

NOVEMBER 2017

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