10th International Telecommunications Energy Conference

Oct. 30 1988-Nov. 2 1988

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Displaying Results 1 - 25 of 89
  • INTELEC. Tenth International Telecommunications Energy Conference (IEEE Cat. No.88CH2653-4)

    Publication Year: 1988
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    Freely Available from IEEE
  • Recombination batteries for telecommunications SIP standardization

    Publication Year: 1988, Page(s):132 - 137
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (222 KB)

    The authors describe standards for valve-regulated lead-acid recombination batteries. Particular attention is paid to the mechanical and electrical characteristics of these batteries, their safety aspects, and essential requirements for office compatibility. The tests required for approval are described. Also described are the salient characteristics of CGA (Compagnia Generale Accumulators) batter... View full abstract»

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  • Worth of a watt for power systems in digital loop carrier and other remote locations

    Publication Year: 1988, Page(s):180 - 185
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (276 KB)

    The `worth of a watt' concept deals with the cumulative operating expense associated with consuming one AC watt of power at any point in a central office power processing chain. Here, the worth of a watt concept is extended from central office power systems to power systems in `confined locations' i.e., small above-ground or below-ground electronic equipment enclosures, that house loop and interof... View full abstract»

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  • Telecommunications powering system

    Publication Year: 1988, Page(s):174 - 179
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (272 KB)

    The authors describe the concept of a powering system for communications network systems and shows its application. The concept involves the integration of the -48 V main power supply and DC-DC converters that form the present powering system used in switching systems. This will eliminate the main power supply, decentralize equipment, and make the system more compact and efficient. In addition, th... View full abstract»

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  • Redundant DC-DC switching power supply system for telecommunication equipment

    Publication Year: 1988, Page(s):167 - 173
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (436 KB)

    A battery-fed multiple-output DC power supply system for telecommunication equipment is described. The system consists of several parallel autonomous power modules with load current sharing and `n +1' redundancy. Each module contains two parallel double-output current-mode controlled forward converters with integrated output filter inductors. Primary attention is focused on the multiwindi... View full abstract»

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  • Studies on solar powered 3 phase MOSFET inverter

    Publication Year: 1988, Page(s):57 - 62
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    The authors describe the developmental studies of a MOSFET-based three-phase inverter, operating from a 400 W photovoltaic power source. Many different drive circuits were tested and their limitations were studied. A three-phase MOSFET inverter was built and tested with an induction motor pump as a load. The inverter uses a pulsewidth-modulation technique to minimize the harmonic contents of the o... View full abstract»

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  • A decentralized power system for telecommunications equipment

    Publication Year: 1988, Page(s):161 - 166
    Cited by:  Papers (5)
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    Nippon Telegraph and Telephone Corporation has been introducing a decentralized power supply which incorporates advanced technological characteristics in the system configuration. These characteristics include load voltage regulation, DC backup circuits, supervision and control using microprocessors, and organization of the power equipment into modularized units that are compact and lightweight. T... View full abstract»

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  • Reliability and availability performance as a tool to optimize power systems

    Publication Year: 1988, Page(s):49 - 56
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (408 KB)

    The authors describe by means of a case study how the reliability and availability performance can be utilized to obtain the optimal solution for uninterruptible power supplies (UPS) from the power systems user's point of view. It is concluded that UPS power systems cannot be optimized if the defined acceptable risk level is not well or not at all defined. In addition, it is noted that optimizatio... View full abstract»

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  • Scrutinizing digital loop carrier energy [telecommunications power supply]

    Publication Year: 1988, Page(s):157 - 160
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (336 KB)

    The authors consider what happens to the wattage which a telecommunications power supply pumps through the constant voltage nodes that separate it from the powered system. It is claimed that circuit designers and system architects, if they gave some attention to energy utilization, could provide the same telecommunications functions at less than half the energy and bring about a 25% decrease in si... View full abstract»

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  • The expanding role of uninterruptible power systems in telecommunications

    Publication Year: 1988, Page(s):43 - 48
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (496 KB)

    The author addresses the expanding role of uninterruptible power systems (UPS) in today's telecommunications operations. He discusses the advantages and disadvantages of application, technology approach, reliability, service, efficiency and intelligence features. A perspective is given to the needs and technology of the present and those of the future. UPS configurations are examined, and attentio... View full abstract»

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  • Sealing current and its impact on ISDN powering requirements

    Publication Year: 1988, Page(s):151 - 156
    Cited by:  Papers (2)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (452 KB)

    Sealing current is a low-level DC current that has been used to maintain the transmission quality of certain interoffice and special services circuits by inhibiting corrosion at wire splices. The authors examine the sealing current issue, and discuss the way in which splices degrade through corrosive attack in the service environment. They also discuss the mechanism by which sealing current inhibi... View full abstract»

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  • Power in the all fiber network

    Publication Year: 1988
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    The author discusses some recent investigations at Bellcore's Applied Research Area (USA) which have centered on power supply issues which require serious attention if broadband service (600 Mb/s) is to become ubiquitous. He points out some of the issues involved and outlines the efforts Bellcore is taking to solve them View full abstract»

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  • Comparison of recombinant lead acid battery technologies

    Publication Year: 1988, Page(s):35 - 42
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (696 KB)

    The basic model of oxygen recombination is examined in terms of the Tafel diagram of wet and valve regulated cells. The various mechanisms of oxygen transport achieved in lead-acid cells are presented. Specific structures or methodologies available to improve the rate of oxygen transport and thereby the limits of recombinant current and voltage are discussed. The advantages and limitations of each... View full abstract»

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  • Distributed power systems [telecommunication power supply]

    Publication Year: 1988, Page(s):143 - 150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (420 KB)

    The author examines the application of distributed power supplies for telephone exchange loads in the range of 200-4800 A. The traditional central supply (locally termed the Integrated Power Suite or IPS) by comparison is seen to be deficient in areas of floor area requirements and flexibility. A cost comparison further shows the deficiency of IPS. The application of very small (combination rectif... View full abstract»

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  • The quality required in electrolyte limited, valve regulated lead-acid batteries for telecommunication systems

    Publication Year: 1988, Page(s):30 - 34
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (360 KB)

    The authors describe the results of a study performed for the purpose of elucidating the impact of critical product features on customer requirements for the valve-regulated lead-acid technology, as gathered through existing literature concerning telecommunication power system design and field experiences. In this study, the necessary areas of concentration were systematically identified by descri... View full abstract»

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  • ISDN-impact on power [supplies]

    Publication Year: 1988, Page(s):138 - 142
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (380 KB)

    The impact of the integrated services digital network (ISDN) on the development of power planning and engineering guidelines for telecommunications power supplies is considered. The load profile is discussed, and attention is given to ISDN power and transport requirements. Power provisioning in an all-fiber network is also examined. Finally, the goals of power planning with respect to ISDN are add... View full abstract»

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  • Compensation method for phase difference unbalance of output voltage in the three-phase triport UPS system

    Publication Year: 1988, Page(s):542 - 544
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (148 KB)

    A novel three-phase constant voltage transformer for the triport UPS (uninterruptible power supply) system is presented. In this circuit, the unbalance of the loads and the asymmetry of input source voltages are compensated by the ring connection of the secondary windings of respective linear inductors. It is concluded that this principle can be applied to the conventional triport transformer with... View full abstract»

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  • An economic analysis of power system designs for remote site telecommunications applications

    Publication Year: 1988, Page(s):472 - 474
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (236 KB)

    The author considers the economic evaluation of eight commonly used power system designs for remote locations. These designs are based on the following power-plant configurations: diesel engine generator, thermal electric generator, closed-cycle vapor turbine, solar electric generator, wind energy conversion system, solar hybrid (PV/diesel), wind hybrid (wind/diesel), and solar/wind hybrid. This e... View full abstract»

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  • The development of stationary sealed lead-acid battery with new electrolyte retaining method

    Publication Year: 1988, Page(s):97 - 103
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1096 KB)

    The features of the Hipac Super-DX stationary sealed lead-acid battery are discussed, with particular emphasis on the electrolyte retaining method. To suppress the stratification of the electrolyte in stationary sealed lead-acid batteries, the authors have developed an electrolyte retainer mainly composed of fine inorganic powder and minute glass fibers. It has been demonstrated that the stratific... View full abstract»

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  • A new current-mode controlled -48 V/100 Amp SMR using isolated semiconductors

    Publication Year: 1988, Page(s):403 - 410
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    The authors describe the development of a 6 kW offline switched-mode rectifier (SMR) which is being manufactured in two versions: three-phase and single-phase. The rectifier uses a full-bridge converter topology with power MOSFET transistors and is current-mode controlled. The unit is convection-cooled and uses only isolated-case power modules which are directly mounted on the heat sink. The recti... View full abstract»

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  • The measurement of ripple current in battery plants

    Publication Year: 1988, Page(s):374 - 378
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (372 KB)

    A draft of a standard for the selection of batteries for UPS (uninterruptible power supply) applications is being written to address the application problems including the reduced-life phenomenon. In looking for a cause for accelerated battery wear-out, the author studied the electrical environment to identify the differences between the relatively recent UPS applications and the older telecommuni... View full abstract»

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  • Coping with very high heat loads in electronic telephone systems of the future

    Publication Year: 1988, Page(s):334 - 338
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    It is shown that in large buildings used by the Bell Regional Companies, conventional and modular cooling systems can handle up to about 1500 W for 2100 mm-high, 660 mm-wide frames, 2200 W/m2 of floor space. This is for occupied spaces in which indoor air temperature is to be kept below 38°C long term and 40°C short term. For unoccupied spaces somewhat higher heat loads could be... View full abstract»

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  • Powersafe valve regulated cells and batteries-a review of operational performance with design life predictions

    Publication Year: 1988, Page(s):25 - 29
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (232 KB)

    The Powersafe produce, launched in October 1982, was the first sealed lead-acid recombination product (of a large capacity) to be developed for use in telecommunication power systems. The authors indicate that performance data on prototype products, can, when tested in sufficient quantities and presented as a population distribution plot, indicate the viability of a product. Performances based on ... View full abstract»

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  • Factors affecting the float performance of the negative plate of the lead-acid battery

    Publication Year: 1988, Page(s):114 - 118
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (280 KB)

    It has been demonstrated that several factors play a role in determining the behavior of the negative plate of the lead-acid battery. It is concluded that, when a battery is intended for float applications, especially in telephone central offices where the degree of reliability required is high, special attention must be paid to all of the factors which can affect the polarization behavior of the ... View full abstract»

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  • Stability improvement of constant voltage transformer for triport UPS system

    Publication Year: 1988, Page(s):536 - 541
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (220 KB)

    A novel method for improving the stability of the AVR (automatic voltage regulator) constant voltage transformer for triport UPS (uninterruptible power supply) systems is introduced. An active filter with an operational amplifier as the feedback element for controlling the AVR is shown to reduce the system instability; this device is more compact and economical than the alternative magnetic feedba... View full abstract»

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