Ground resistance testers
December 2011
Electrical Power & Protection
The new ground testing instrument family from Megger offers a unique solution to ground rod testing needs. The four models comprise a digital three-terminal instrument for grounding and bonding tests; a digital four-terminal model that adds resistivity measurement; an analogue three-terminal model; and a revolutionary new three-terminal tester that adds a current measuring function for Attached Rod Technique (ART) testing capabilities. With this added function, on-site grounds can be tested separately without having to remove the utility connection.
All models are rated to IP54, making them truly outdoor instruments. The ground testers have been designed for easy use. A large selector switch makes selection of two-pole, three-pole or four-pole (DET4TD) tests easy. Fitting of shorting links to perform two-pole tests is a thing of the past. A large, clear, easy to read LCD or analogue (DET3TA) display and thumb sized test button also make the instruments particularly well suited to the outdoor conditions of ground testing. In addition, the ground tester automatically checks the connection and condition of the P spike, the C spike, and the level of ground noise, indicating the status on the display. The analogue model allows the operator to check the condition of the spikes.
The instruments also include a voltmeter to enable measurement of ground voltage. The testers can measure resistance from 0.01 to 2000 Ω and earth voltages up to 100 V. To allow accurate testing in noisy environments, the instruments are capable of rejecting noise of up to 40 V peak to peak.
They are powered by eight AA batteries which are widely available and give excellent testing time. The status of these batteries is given by a bar graph on the LCD display, allowing the operator to decide when to change the batteries before they expire. On the analogue model, battery status is indicated by selecting the function on the selector switch. The Megger ground testers are designed to meet stringent safety standards and are rated CAT IV 100 V.
For more information contact Stuart Ashton, Surgetek, +27 (0)11 792 1303, info@surgetek.co.za, www.surgetek.co.za
Further reading:
High-performance industrial power converters
Electrical Power & Protection
Vepac Electronics supplies PowerGood’s range of industrial AC/DC and DC/DC converters, spanning 15 W to 700 W, with full protection features and compliance with EN55032 Class A and Class B electromagnetic interference standards.
Read more...
Decarbonising the energies and chemical industry without the risk
Schneider Electric South Africa
Electrical Power & Protection
Schneider Electric argues that decarbonisation in Africa’s energies and chemical industry need not compromise production or profitability. A phased, digitally enabled approach, starting with energy efficiency improvements, can reduce emissions while strengthening competitiveness.
Read more...
Modular UPS system with scalable, high-availability architecture
Electrical Power & Protection
Legrand South Africa has launched its fifth-generation TriMOD three-phase modular UPS, available from 10 to 80 kW. The system features hot-swappable modules, multiple input/output configurations, and up to 99% efficiency in Eco Mode, designed for data centres and critical industrial environments.
Read more...
Accurate illuminance measurement for safer, more efficient environments
Electrical Power & Protection
The Sonel LXP-10A illuminance meter is designed for accurate measurement of lighting levels in industrial environments where adequate illumination is essential.
Read more...
Why mining operations need local lightning early warning
Senseca
Editor's Choice Electrical Power & Protection
Lightning can develop into a serious mining hazard before the first local strike, leaving crews little time to stop work and reach safety. Local early-warning technology can provide valuable lead time, allowing mines to connect developing storm conditions to defined trigger actions that protect people, explosives and equipment.
Read more...
South Africa’s dirtiest fuel is building its most resilient boilers
Electrical Power & Protection
Steinmüller Africa argues that duff coal, the low-grade fines and discards stockpiled over decades, can now underpin reliable, compliant industrial boilers using mature circulating fluidised bed combustion technology, turning a long-standing liability into a phased energy transition pathway.
Read more...
Retrofitting for sustainability
Schneider Electric South Africa
Electrical Power & Protection
As budgets tighten and sustainability targets increase, retrofit and modernisation strategies are gaining traction across Africa, allowing organisations to upgrade only what limits performance while preserving existing infrastructure and extending asset life.
Read more...
USB-Datalogger for voltage 0 to 30 V DC
Vepac Electronics
Electrical Power & Protection
The PeakTech 5186 is a data logger for DC voltages from 0 V to 30 V with terminals on the top of the device.
Read more...
Pole-top boxes for smarter, more secure electricity networks
Electrical Power & Protection
As South Africa accelerates the rollout of smart prepaid electricity metering, innovative enclosure technology from Power Process Systems is helping utilities improve network security, reduce electricity theft and protect critical electrical infrastructure.
Read more...
Simplifying electrical design compliance
Electrical Power & Protection
Referro Systems highlights how Rockwell Automation’s Global SCCR Tool simplifies short-circuit current rating compliance for complex industrial electrical systems.
Read more...
printer friendly version