Sparks Electrical News October 2017

MOTOR CONTROL CENTRES AND MOTOR PROTECTION

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SWITCHGEAR SOLUTION AT DRC MINE

“The fully withdrawable circuit breakers and voltage transformers (VTs) make the design ideal for a container, while also improving the ease of maintenance of the circuit breakers and VTs,” says Moss. The WEG switchgear offers a number of features that are particularly advantageous. For instance, the panel has an arc resistant design with internal arc classification (IAC) of BF ALR 31,5 kA for one second. This is a major safety related feature which not only ensures safer working conditions for personnel but reduces the amount of personal protective equipment they require when working on the system. “Safety is always paramount in the engineering of solutions by Shaw Controls, and this one is no different,” he says. “In the case of an arc explosion, the gases are vented through an internal tunnel running the length of the board. This way, the gases can be ducted out of the sub- station, further enhancing safety. It also means that little clearance is required above the panel, which saves space.” The panel also boasts a short-time withstand rating of up to 31,5 kA for three seconds, a tions with up to 40 starts per hour. • An integral bypass is initiated at the top of ramp and reduces losses in the soft starter. • Intentional start delay allowing pump actuators to engage before start. • A standard 24 Vdc control voltage supply with an optional power module which adapts the digi- tal input voltage to accept a 110–230 Vac signal. • One common unit frame size across the volt- age range of 200–600 Vac facilitating efficient panel layout and interconnections to reduce ma- terial and panel production time. • Protecting the motor and soft starter in the event of an overload situation at full I²t motor overload

LEVERAGING the advantages of a containerised solution, Zest WEG Group company Shaw Controls has provided an optimal medium voltage switch- gear solution for the supply of power at a cop- per mining project in the Democratic Republic of Congo. The WEG MTW05 MV switchgear, the first to be supplied by Shaw Controls into a mining project in Africa, was installed at the Kamoa- Kakula project in the DRC’s Katanga province, located 25 km west of Kolwezi and 270 km west of the provincial capital of Lubumbashi. “Our engineers provided an innovative design solution to incorporate the switchgear into a standard 12 m container, which is more cost effective than fabricating an E-house from scratch,” says Kirk Moss, medium voltage manager at Shaw Controls. “The dimensions of a container make it far easier to transport and to install on site, giving the customer a convenient ‘plug and play’ solution.” The designwas able to fit a31,5kAwithdrawable metal-clad board into a containerised solution, with innovations that allow back access without compromising on the available space. A gility™ soft starters have been developed to exceed demands of industrial automation motor control clients. They deliver stable, structured start and stop ramps for smooth and ef- ficient performance. One standard frame size cov- ers all typical applications from 7.5 kW to 45 kW at 500 Vac, 11 kW to 45 kW at 600 Vac. Features and benefits: • Current is limited during soft stopping and gives greater control against water hammer. • External input signal overriding normal controls - allowing the motor to continue running in emer- gency situations. • Optional cooling fan for frequent duty applica-

at the company’s premises prior to its dispatch to the mine; with its ‘plug and play’ design, the installation was able to be easily conducted by the mine itself. The Weg MTW05 MV switchgear, the first to be sup- plied by Shaw Controls into a mining project in Africa, was installed at the Kamoa-Kakula project in the DRC’s Katanga province.

considerably high fault level for a panel of this size. The range of WEG MTW05 panels is available in voltages of up to 17,5 kV and currents of up to 2 500. The full containerised solution was manufactured at Shaw Controls’ 12 000 m 2 facility at Robertsham in Johannesburg, which is manned by a team of skilled technical personnel. A full factory acceptance test was conducted with intelligent thermal memory retention feature. • Continually monitors overloads to ascertain the reduction in overload levels even when Agility™ is in the ‘off’ state. Agility™ life event logging is a feature that records the last 1600 events to enable fast accurate faults analyses and their resolution. Recording multiple activities including start, stop, top of ramp, faults, ap- plication parameters (time, overload level, currents, frequency) and the device information. The data is collated in StarterView programme and provides the operator with the advantage to undertake a detailed

Enquiries: +27 (0)11 723 6000

FAIRFORD AGILITY SOFT STARTER

analysis of performance and equipment condition- ing in an active predictive and preventative mainte- nance strategy to avoid unwanted breakdowns and lost production time. A suite of pre-programmed application ‘complete setup’ profiles facilitate a quick and comprehensive commission process to give freedom and independence to engineers. Agility™ soft starters are available from EP Normand.

Enquiry: +27 (0)11 824 1320

The EDX10 speed switch uses optocoupler and microprocessor technology to measure rotational speed accurately. The device is directly coupled and has a sensing range of 1~150 rpm. It has an auto-ranging power supply of 110~220 V ac or 24 V dc and is setup by the on-board rotary switches. The speed switch moni- tors in clockwise and anti-clockwise directions and the output re- lay has a selectable thirty second start up delay. The entire device is made from corrosion free material and can be used in Zone 21 environments. EDX10 SPEED SWITCH

Enquiries: + 27 (0)31 765-4748

FULL-FEATURED DATA COLLECTOR

VIBXPERT II is a high performance, full-featured​FFT data collector and signal analyser which allows easy condition monitoring of equipment found in many industries such as power generation, petrochemical and pulp and paper. It collects field data including vibration information, bearing condition, inspection and process data. Extensive analysis functions facilitate data analysis and condition diagnostics on site. For in-depth analysis, archiving and documenta- tion it passes the collected information to the omnitrend maintenance software. VIBXPERT® II combines the proven features of its predecessor with the advantages of rapid processors and a brilliant energy-efficient colour display. It demonstrates that the use of powerful components does not rule out low power consumption. It is: • Intuitive to operate on its graphical user interface with effective use of colour. • Fast, thanks to optimised measuring workflows and advanced processor technology. • Ergonomic with a handy design and brilliant colour display.

• Powerful owing to many practical analysis functions and measuring templates. • Long-lived with a long battery life and a large data memory. The unit has five industrial interfaces, is colour-coded for easy identification and connects to a variety of different sensor types and data links.​

Enquiries: www.yellotec.co.za

SPARKS ELECTRICAL NEWS

OCTOBER 2017