Electrical Power & Protection


Latest Articles

Versatile three-phase power supply unit
January 2002
Munich-based power supply specialist, PULS has launched a three-phase, compact 240 W standard power unit (10 A at 24-28 V d.c.) with a number of innovative features, some of which are discussed below. ...

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New generation lightning current and overvoltage arrester
December 2001, Surge Technology
The new DEHNventil TT is a combined Class I lightning current arrester and Class II overvoltage arrester in one compact unit requiring only 30% of the space of similar devices. No decoupling inductance ...

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Rehabilitation and modernisation of the Mont Blanc tunnel (France)
October 2001
In order to ensure another catastrophe like the 24 March 1999 fire in the Mont Blanc tunnel in France does not happen again, new security measures have been taken for the rehabilitation of the Mont Blanc ...

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Powerful power surge protectors
October 2001
Cape Town-based Rhomberg manufactures and distributes power surge protectors that can withstand surges of up to 300 kA. Originally designed by McAllister Technologies of Pietermaritzburg, the Rhomberg ...

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5-in-1 power entry module
October 2001
By integrating five functions in a package, Schurter says its unit takes up about one third less panel space than similar modules on the market. It contains an AC power inlet, one or two-pole on/off switch ...

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High capacity arrester makes use of gliding spark gap technology
October 2001, Surge Technology
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
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, Surge Technology
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
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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