Low resistance digital ohmmeter
March 2013
Electrical Power & Protection
Megger’s DLRO200-115 ohmmeter checks and measures contact resistance in high voltage circuit breakers, disconnecting switches (isolators), busbar joints and other low resistance applications. The test set accurately measures resistances ranging from 0,1 μohm to 1 ohm at high currents.
It is a versatile instrument that can provide test currents from 10 to 200 amps, subject to the load resistance and supply voltage. For applications that demand a smooth DC current, the DLRO200-115 has extra filtering on the output to reduce mains frequency ripple. It can drive 200 amps through a total current loop resistance of 11 milliohms. The filtered output also eliminates magnetic transients that could inductively trip a breaker’s control (bus differential relay) if left in the test circuit.
The unique design allows the weight and size of the Megger DLRO200-115 to be kept to a minimum; the instrument weighs less than 15 kg. This, together with a water/dust ingress rating of IP54, makes the test set equally applicable in the workshop, on the production floor or in the field.
Three hundred sets of results can be stored in the on-board memory for later download to a PC or output directly to a printer via the RS232 port. The user may also add notes to any stored result by using the on-board alphanumeric keypad, thereby making later identification of results easier to determine.
For more information contact Stuart Ashton, Surgetek, +27 (0)11 792 1303, [email protected], www.surgetek.co.za
Further reading:
Quantum battery charges in a quadrillionth of a second with a laser
Electrical Power & Protection
Researchers have created the world’s first miniature, proof-of-concept quantum battery. If the technology can be replicated, it could transform the field of energy storage forever and open up new possibilities for lightweight, remote electrification, experts say.
Read more...
Phoenix Contact brings machine learning forecasts ito energy management
Phoenix Contact
Electrical Power & Protection
Phoenix Contact is extending its Energy Management Service to include a powerful forecasting function.
Read more...
Unpacking the technoeconomic case for cleaner power in wastewater plants
Schneider Electric South Africa
Electrical Power & Protection
Behind every reliable wastewater plant is an electrical system exposed to the effects of harmonics, voltage distortion and overloaded networks caused by fleets of variable speed drives on pumps and aerators.Together, they steadily drive up maintenance demands and elevate the risk of failure.
Read more...
Energy strategy as a competitive advantage for African businesses
Electrical Power & Protection
Energy is no longer simply something that businesses consume. When managed effectively, it becomes a controllable asset that supports resilience and efficiency and sets the foundation for long-term competitiveness.
Read more...
World’s fastest 14 bit arbitrary waveform generator
Vepac Electronics
Electrical Power & Protection
The ARB Rider AWG-700 from Vepac is the world’s fastest 14 bit arbitrary waveform generator, with a 20 GS/s real-time update rate and 14 bit vertical resolution.
Read more...
Transformers for mining house in Botswana
ACTOM Electrical Machines
Electrical Power & Protection
LH Marthinusen is completing the manufacture of two 30 MVA transformers for a mining house in Botswana.
Read more...
DIN-rail power supplies for reliable and efficient AC/DC conversion
Conical Technologies
Electrical Power & Protection
The Claf Power AD75-2BxxS series DIN-rail power supplies are designed for industrial automation, control systems and process environments.
Read more...
Rethinking power for Africa’s data centres
Schneider Electric South Africa
Electrical Power & Protection
Africa’s digital economy is scaling faster than its power systems. If it wants resilient, competitive and sustainable data centres, the starting point must be a grid-to-chip architecture rather than a genset-first mentality.
Read more...
The growing decentralisation of power grids
Electrical Power & Protection
The decentralisation of power generation is changing how national grids function. For electrical engineers, several new challenges and opportunities are on the horizon.
Read more...
Custom mini substations for Zambian copper mine
Electrical Power & Protection
Recent orders to supply seventeen specially engineered mini substations for an underground copper mine in Zambia reinforces Trafo Power Solution’s track record in delivering customised electrical solutons for challenging environments.
Read more...
printer friendly version