SPECIALIST EQUIPMENT


ittelfuse circuit protection products are vital components in virtually every market that uses electrical energy, from consumer electronics to automobiles, commercial vehicles and industrial equipment.


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Keep input stray capacitances small Potential for earth-leakage currents in drives connected to a single feeding transformer rises with use of lengthy cables. T ese problems are minimised by keeping the distance between transformer and drive as short as possible. Ideally the transformer can be


integrated in or positioned very close to the drive. T is keeps earth-leakage currents to a minimum level.


High-impedance earthing Multi-winding transformers, which are common on high-power drives, don’t allow the classical underground mining solution of putting a neutral earthing resistor on the secondary of the distribution transformer. Instead, to achieve high-impedance earthing, a resistor network is put at the output side of the drives. T e resistors can therefore both measure and limit any earth-fault currents at this point. By following these simple steps, earth-leakage safety risks when using drives in underground mining applications will be kept to a minimum. T is ABB solution has a growing installed base in Australia and has been certifi ed as standard AS/NZS 2081:2011 – Electrical protection devices for mines and quarries. ●


EL731 AC/DC sensitive earth- leakage relay from Littelfuse


For more information ✔ at www.engineerlive.com/ime Tino Wyman is with ABB Australia. www.abb.com


Your Partner for Mining Face unique challenges with proven pump solutions


 Reduce wear costs  Ability to pump slurries with high solids content  Transport very abrasive, dense and viscous media  Conveyance of aggressive media  Save time and money on maintenance


www.netzsch.com For more information ✔ at www.engineerlive.com/ime


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