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    The transformer [historical overview]

    Coltman, J.W.
    Industry Applications Magazine, IEEE

    Volume: 8 , Issue: 1
    DOI: 10.1109/2943.974352
    Publication Year: 2002 , Page(s): 8 - 15
    Cited by:  Papers (1)

    IEEE Journals & Magazines

    Just a century ago, the transformer made the distribution of electric power a practical endeavor. Many elements of modern life depend on it, yet it remains one of technology's unsung heroes. This article presents an historical overview of the development and application of the transformer. View full abstract»

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    Protection designs in medium voltage distribution networks, time to reconsider

    Schoonenberg, Gerard ; Stoelhorst, Jan ; Pikkert, Alex
    Electricity Distribution, 2005. CIRED 2005. 18th International Conference and Exhibition on

    Publication Year: 2005 , Page(s): 1 - 5

    IET Conference Publications

    The quality of the electricity supply has always been a point of major interest. Worldwide there is an increasing concern about Power Quality [1,2]. On the other hand the electricity-market is quite conservative. This implies that long used solutions are often not questioned, so in general no reconsideration takes place anymore, although more economical or technical optimised solutions may exist. In addition to this the technical know-how in the utilities nowadays seems subsidiary to the (short term) economical concerns. This article explains what the real backgrounds are for the widely used fuse protection of transformers. The fuses dealt with are considered to be of the current limiting type, as mainly used in Europe; so expulsion fuses are not taken into account. With the help of a few examples it is demonstrated that a lot of misinterpretations exist about application aspects. After a historical overview of MV-transformer protection in the Netherlands, as applicable for many other countries, the nowadays considerations for this protection are dealt with. This results in listing the pros and cons of protection with fuses compared to circuit-breakers (CB's). The conclusions of these considerations were used for the design and main specifications of a new generation of indoor switchgear for 12 and 24kV networks. (Fig.1) [3]. View full abstract»

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    How to increase cross border transmission capacity? A case study: Belgium

    Bekaert, D. ; Meeus, L. ; Van Hertem, D. ; Delarue, E. ; Delvaux, B. ; Kupper, G. ; Belmans, R. ; D'haeseleer, W. ; Deketelaere, K. ; Proost, S.
    Energy Market, 2009. EEM 2009. 6th International Conference on the European

    DOI: 10.1109/EEM.2009.5207176
    Publication Year: 2009 , Page(s): 1 - 6
    Cited by:  Papers (2)

    IEEE Conference Publications

    Cross border capacity allows electric energy to be traded internationally. The electricity sector used to be vertically integrated and often state-owned. High voltage grids were generally developed within the borders of a country. Connecting different national high voltage grids was done to improve the security of the system and to accomodate for a few historical long term contracts. By doing so, the different systems could share their reserve generation capacity. Since the liberalization of the electricity sector, cross border capacity has gained a renewed interest as this can increase the competition in the market. This paper aims to give an overview of recent and planned investments which increase the cross border capacity of Belgium. Also we give an insight into the different technologies which can be used and their advantages and drawbacks are discussed. View full abstract»

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    High-Efficiency Doherty Power Amplifiers: Historical Aspect and Modern Trends

    Grebennikov, A. ; Bulja, S.
    Proceedings of the IEEE

    Volume: 100 , Issue: 12
    DOI: 10.1109/JPROC.2012.2211091
    Publication Year: 2012 , Page(s): 3190 - 3219
    Cited by:  Papers (16)

    IEEE Journals & Magazines

    In modern wireless communication systems, it is very important to realize simultaneously high-efficiency and linear operation of power amplifiers. This paper-overview describes the historical aspect of the Doherty approach to the power-amplifier design introduced in 1936 and modern trends in Doherty amplifier (DA) design techniques using multistage and asymmetric multiway architectures. To increase efficiency over the power backoff range, the switchmode class-E, conventional class-F, or inverse class-F operation mode by controlling the second and third harmonics can be used in the load network. The DA with a series-connected load, and inverted, push–pull, balanced, and parallel Doherty architectures are also described and discussed. Finally, examples of the lumped DA implemented in monolithic microwave integrated circuits, digitally driven Doherty technique, and broadband capability of the two-stage DA are given. View full abstract»

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    Refurbishment of the static VAr compensator at Laurentides

    Bilodeau, H. ; Rollin, L.P.
    Power Engineering Society General Meeting, 2003, IEEE

    Volume: 1
    DOI: 10.1109/PES.2003.1267194
    Publication Year: 2003

    IEEE Conference Publications

    This paper provides a case study of the refurbishment of a 1978 SVC at Laurentides. A historical overview of the operating experience is provided with an evaluation of the state of the equipment prior to refurbishing. A full description of the justification to extend life at a minimum cost is given. Finally, a retrospective of the key technical aspects of the project development and the lesson learnt are presented. View full abstract»

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    Power system grounding. II. RCD and GFCI

    Owen, E.L.
    Industry Applications Magazine, IEEE

    Volume: 2 , Issue: 4
    DOI: 10.1109/2943.503531
    Publication Year: 1996 , Page(s): 71 - 73
    Cited by:  Papers (5)

    IEEE Journals & Magazines

    This article continues a series of historical articles on power system grounding. This part presents a technological overview of the residual current device (RCD) and ground fault circuit interrupter (GFCI) power system protection devices View full abstract»

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    Overview of the recent developments of ultra high voltage AC transmission in China

    Daochun Huang ; Jiangjun Ruan ; Shifeng Yu
    Power and Energy Society General Meeting - Conversion and Delivery of Electrical Energy in the 21st Century, 2008 IEEE

    DOI: 10.1109/PES.2008.4596861
    Publication Year: 2008 , Page(s): 1 - 9
    Cited by:  Papers (1)

    IEEE Conference Publications

    The developments of ultra high voltage (UHV) alternating current (AC) transmission in China were reviewed in this paper. The UHV AC transmission historical developments in the past twenty years; the research results of the UHV key technologies including electromagnetic environment, overvoltage and insulation coordination, lightning performance, live-line working, equipments manufacture in the recent years; the design parameters and construction of UHV AC experimental and demonstration line, and UHV AC test base were introduced. View full abstract»

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