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IEE Review

Issue 2 • Date Mar 2000

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Displaying Results 1 - 6 of 6
  • A new era in HVDC?

    Page(s): 33 - 39
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (952 KB)  

    The authors review the advantages of high-voltage DC transmission, and discuss the benefits that the use of voltage-sourced converters could bring. They start by giving a simple representation of an HVDC interconnection and then discuss the use and benefits of HVDC for bulk power transmission, power transmission via cables, termination between unsynchronised AC systems, parallel AC/DC transmission, and minimising short circuit capacity increases. New power semiconductor devices for HVDC are discussed, in particular, the voltage source converter and its applications in HVDC for rotating machines and reactive power control View full abstract»

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  • Clear road ahead? [intelligent transport systems]

    Page(s): 9 - 14
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (912 KB)  

    Intelligent transport systems (ITS) offer a solution to some of the problems that plague Britain's busy highways. ITS are characterised by the three features of communication, integration and information. The authors discuss the problems faced by the transport network and the role that could be played by ITS in overcoming the problems. In particular the authors discuss implementation of change required by introduction of ITS. Several initiatives, enabled by new technologies, are seeking to deal with these issues and to deliver working solutions that will influence transport and travel during the next 10-20 years. These are: Urban Traffic Management Control, ITS City Pioneers, MATTISSE system, Highways Agency Traffic Control Centre, Road Traffic Advisor project, and road user charging trials View full abstract»

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  • Joint effort [mobile robot developments]

    Page(s): 40 - 41
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1340 KB)  

    The author describes how distributed control has allowed British engineers to take a leap forward in the development of mobile robots for industrial applications View full abstract»

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  • Pure and applied [Mike Brady, medical imaging systems]

    Page(s): 21 - 24
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (720 KB)  

    The IEE Faraday Medallist for 2000, Mike Brady, is using the lessons of his pioneering work in machine vision and robotics to transform the capabilities of medical imaging systems. The author traces the common themes in a remarkable career which started in pure mathematics and moved on to computing. Following a time at the Artificial Intelligence Laboratory at MIT working with mostly fixed robots, Brady moved to Oxford where he worked with mobile robots. Following family illnesses he looked at the link between medical imaging, robobtics and machine vision which led to the improvement of medical MRI systems View full abstract»

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  • Three of a kind [UPS topologies, IEC standard]

    Page(s): 27 - 31
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (1156 KB)  

    With uninterruptible power supplies now used in critical applications across every industrial sector, a standard terminology to describe types and performance measures has become essential. The author outlines how the international standards community has responded to this need by introducing IEC 62040-3 which distinguishes three types of UPS topology: passive standby, line interactive, and double conversion. These three topologies are described. For low power ratings (less than 2 kVA) all three topologies, as defined by the standards, are used. For medium to high power ratings, the case for the passive standby and the line interactive is, at best, marginal, in spite of their significantly lower cost. The vast majority of sales to medium to high-power rating applications are represented by double conversion UPSs (95% from a few kVA upwards; 98% above 10 kVA). The dominance of the double-conversion topology is attributable to its almost total lack of weaknesses, combined with the capacity to meet the needs of sensitive loads at these power ratings-a consequence of UPS being connected in series with the utility power sources View full abstract»

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  • Data highway to the stars

    Page(s): 15 - 18
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (712 KB)  

    Connecting individual radio telescopes by microwave links has allowed radio astronomers to create instruments with resolving powers equivalent to a single telescope hundreds of kilometres in diameter. The author describes how optical fibre links could yield a further dramatic increase in our ability to explore the furthermost reaches of the universe View full abstract»

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