Electrical Power & Protection


Latest Articles

High capacity arrester makes use of gliding spark gap technology
October 2001
The Dehnventil from Surge Technology is a two or four-pole arrester incorporating patented specialised gliding spark gap technology, which limits overvoltage values to below 3 kV during direct lightning ...

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Lightning protection for networked systems
September 2001
Surge Technology has developed over 200 specific protection modules for the various computer and instrumentation protocols, video/intercom, radio and other related systems

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Flexible addition to UPS' range
September 2001
Power Development Services, the South African distributor for Liebert Hiross power products, has recently extended their successful uninterruptible power supply (UPS) range to include the new Nfinity ...

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Improved lightning protection in less space
September 2001
The new DEHNventil is a combined Class I lightning current arrester and Class II surge arrester in one compact unit requiring only 30% of the space of similar devices. No de-coupling coils are necessary ...

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Surge protection/optical isolation
July 2001, RJ Connect
Protect your equipment and investment.       Serial connection problems in an industrial environment Serial communication reliability can be adversely affected in a hazardous industrial environment. The ...

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Multilevel surge protection
June 2001, Phoenix Contact
Termitrab TT are terminal blocks with multilevel surge protection. The narrow design (6,2 mm wide) makes this product especially useful for projects where several signal interfaces for automation technology ...

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Power quality recorder invokes positive response
June 2001, TLC Engineering Solutions
Columbus Stainless plant in Middelburg is satisfied with the power quality monitoring system, which was bought two years ago from Bryanston-based TLC Software. The system was chosen after a thorough market ...

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Switchmode PSUs meet international requirements
June 2001
On 1 January 2001, the EN 61000-3-2 standard became mandatory. According to this standard, the harmonic oscillation current of primary switchmode power supplies has to be within certain set limits. Equipped ...

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Stable and compact 24 V power supplies
June 2001
Telemecanique by Schneider Electric is offering the Phaseo, its new range of regulated switchmode power supplies, which offer simplicity of use and compactness of size. Phaseo, claimed to be the smallest ...

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New powerful multifunctional power meter
June 2001, Timecount
The A2000 multifunction power meter offers a full house of features with capabilities to measure and display four values simultaneously. There are a myriad of display combinations for current; voltage; ...

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New PC power supply with enhanced -12 V d.c. output
April 2001
Advantech has introduced a -12 V d.c. high-current PC power supply specifically for systems integrators who are using their IPC-610 industrial PC chassis for computer telephony applications. The IPC-610's ...

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Buying a UPS: technical concerns
February 2001
There are three types of UPSs - off-line, line-interactive and on-line

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Locating battery ground faults without sectionalising
November 2000
The AC injection method measures fault resistance in the battery system without sectionalising the DC system

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Sophisticated power analyser
November 2000
An analyser that has proved to be very useful in the testing of filtering, voltage stabilisation, uninterrupted power supplies, surge and lightning protection, transformers and DC power supplies. Ferro-Tech, ...

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Preventing systems corruption due to power supply fluctuations
November 2000, Rhomberg Instruments 2006
Users of electronic and computer equipment often experience sudden, sometimes unexplained crashing of their systems, resulting in frustrating and costly downtime while work is backed-up and regenerated. ...

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Intrinsically safe UPS
November 2000
Trolex is offering an intrinsically safe battery- maintained power supply for use in group-1 hazardous areas. The UPS is supplied as a lightweight (10 kg) and compact unit enclosed in a DMC moulding. ...

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Management of sealed lead acid batteries in reliable small DC standby power supply systems
September 2000, Omniflex Remote Monitoring Specialists
It is important to choose a power supply/battery charger combination that meets the needs of the system

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Spotting power failures before they occur
July 2000
Traditionally, the thermal method used to locate switchgear faults was to 'look' at the switchgear cabinet from the outside, with infrared cameras or infrared sensors. This had the disadvantage that any ...

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Family of power supplies meets highest EMC standards
July 2000, Shorrock Automation
The new switched-mode power supplies from IFM Electronic have a 24 V d.c. output voltage and are available in one-phase versions from 1 to 20 A and in three-phase versions from 5 to 40 A. Easy mounting ...

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The need for a UPS
July 2000
Paul Ashworth, Product Manager at local uninterruptible power supply (UPS) manufacturer, Meissner, believes that South Africans are misinformed when it comes to UPSs. "Electrical faults can cripple a ...

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