Electrical Power & Protection


Latest Articles

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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Alternative power system for mains back-up or mobile AC power
July 2000
Tripp Lite SA distributor Comztek has introduced the Powerverter alternative power systems (APS) to provide a safe and more cost-effective source of reliable AC power. "Powerverter APS gives users access ...

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Static electricity problem solved with compressed air
May 2000, Electro-Test Instrumentation
A pharmaceutical company needed to fill mouthwash bottles at a rate of 200 per minute. Friction with the conveyor belt and guide rails produced a static charge on the bottle surface that resulted in two ...

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Space -saving power supply units
March 2000
Murrelektronik has expanded what was already one of the most comprehensive power supply ranges available, with two new additions: the MNG and MDG. The MNG power supplies are single phase, smoothed units. ...

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