Drying out of wet transformers

June 2005 Maintenance, Test & Measurement, Calibration

Available from ETEST, this on-line tap changer filtration system ensures safe, 24-hour operation with constant filtration of the oil. Carbon is continually removed down to 300 nm (0,3 µ) and dissolved water is removed down to less than 10 ppm. The system has been field proven and laboratory tests have shown significant improvement in oil dielectric strength.

The basic model measures a compact 750 x 750 x 500 mm. It can be wall or pad mounted. A pressure switch and float switch are included as standard, ensuring full system protection at all times. Any fault condition is easily traceable through the incorporation of indicator lights. Fitting the tap changer filtration units can lengthen the service life of tap changers, extend service intervals and lower operation costs. The unit is easy to maintain and filter change outs are easily accomplished with minimal mess.

Velcon pioneered the on-line filtration of oil in Tap Changers, and many 'copy cat' systems now available on the market. Velcon believes that the incorporation of Superdri technology into the system keeps it a step ahead of the competition. More advanced systems are available with PLC controls and numerous other options including timers, heaters, automatic system isolation, etc.

Further reading:

Oils don’t die, they degrade
Wearcheck Maintenance, Test & Measurement, Calibration
WearCheck explores the main ways lubricants degrade in service and how these degradation modes affect oil performance and machine reliability.

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Real-time spectrum analyser
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The PXE series real-time spectrum analyser covers frequencies up to 20 GHz with a 100 MHz analytical bandwidth and ultra-fast sweep speed, supporting spectrum monitoring, interference finding and RF test and measurement functions.

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Preserving a French heritage landmark
Omniflex Remote Monitoring Specialists Maintenance, Test & Measurement, Calibration
Omniflex supplied a remotely monitored impressed current cathodic protection system for the Perret Tower in Grenoble, a protected French heritage site, combining 24/7 corrosion protection with integrated surge protection against lightning strikes.

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Operational efficiencies and safety compliance with preventive maintenance programmes
Maintenance, Test & Measurement, Calibration
Konecranes explains how its Lifecycle Care Preventive Maintenance programme reduces unexpected downtime, improves safety compliance and delivers measurable financial benefits for operators of cranes and lifting equipment across any make or sector.

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Portable appliance tester
Vepac Electronics Maintenance, Test & Measurement, Calibration
Vepac Electronics’ new portable appliance tester enables precise safety testing of electrical appliances in accordance with DGUV regulation 3 and BetrSichV, with simple three-button operation and battery-powered mobility.

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Why lubrication fails in mining and what to do about it
Maintenance, Test & Measurement, Calibration
Lubrication Engineers explains the recurring failure points behind mining lubrication problems and how the right product, storage and application practices can improve equipment reliability.

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When digital twins move from concept to critical tool
IT in Manufacturing System Integration & Control Systems Design Maintenance, Test & Measurement, Calibration
Digital twins are moving out of the lab and onto the mine, the factory floor and the transport network where they predict failures before they happen. Amritesh Anand looks at where they earn their keep, the data and integration work behind them, and the security questions every organisation should ask before switching one on.

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Why asset level intelligence is now essential for resilient wastewater plants
Schneider Electric South Africa Maintenance, Test & Measurement, Calibration
Sub-Saharan Africa’s wastewater operators face mounting pressure to keep ageing plants running smoothly and meet tougher environmental standards, all while lacking visibility into the health of their medium-voltage (MV) drives and other critical rotating assets. Adding predictive analytics, digital twins and enterprise dashboards enables optimisation across multiple sites, ensuring every drop moves safely and efficiently through the water cycle.

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How multiple boilers can minimise costly downtime
Maintenance, Test & Measurement, Calibration
Associated Energy Services explains how multi-boiler systems reduce downtime risk for South African manufacturers, covering redundancy planning, fuel source diversification and the strategic management of backup boiler capacity.

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Field calibration made easy
Instrotech Maintenance, Test & Measurement, Calibration
Instrotech’s locally designed and manufactured Calog calibrator range feature a rugged IP54-rated housing, backlit display with data logging via SD card, and a lithium-ion battery with approximately eight hours of run time.

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