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Telecommunications Energy Conference, 1988. INTELEC '88., 10th International

Date 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
    Request permission for commercial reuse | PDF file iconPDF (6 KB)
    Freely Available from IEEE
  • 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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  • 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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  • 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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  • Design criteria and practical experience with hybrid systems using photovoltaic cells and closed cycle vapor turbogenerators

    Publication Year: 1988, Page(s):458 - 465
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    Studies for amelioration of the telecommunication network in and between the islands of the Federal Islamic Republic of Comoros were performed in 1980. The economic comparison of various possible sources of energy included solar and wind, and the photovoltaic generator was chosen as the primary power source for remote stations. The approach for system sizing was based on utilizing a daily simulati... 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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  • 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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  • Thermal control wall for telecommunication equipment rooms

    Publication Year: 1988, Page(s):280 - 284
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The authors describe the feature and operation of the thermal control wall (TCW) system, which combines an exterior wall and cooling system. It can vary its heat transmission coefficient from one to ten times that of an ordinary wall. The TCW cools rooms efficiently, using cool outer air during the winter. The TCW can decrease the load on air conditions if used jointly with them, and save energy a... 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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  • A revised approach to hybrid system design

    Publication Year: 1988, Page(s):448 - 457
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    The Norwegian Telecommunications Administration (NTA) has developed a revised approach to hybrid power-system design using wind generators to power telecommunications systems in remote areas. The authors describe the techniques and methods adopted and the expected results form this revised design. The focus has fallen on improving the utilization of waste heat from the fuel-fired part of the power... View full abstract»

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  • Nickel cadmium batteries in UPS design features

    Publication Year: 1988, Page(s):388 - 393
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    The author presents design features and service experience gained which indicate why the nickel-cadmium pocket plate battery is a viable alternative to lead-acid batteries in UPS (uninterruptible power supply) systems where reliable standby power is essential. Laboratory testing indicates that nickel-cadmium pocket plate batteries are not influenced by the unique voltage conditions in UPS systems.... View full abstract»

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  • A microprocessor based power plant monitor and control system having total rectifier diagnostic capability

    Publication Year: 1988, Page(s):257 - 264
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The ACCLAIM is a microprocessor-based power-plant controller designed to provide the user with the primary features of statistics gathering and plant control. The hardware and software are designed in a modular fashion to permit maximum flexibility for future expansion and enhancements. The features of ACCLAIM are presented, and function implementation is reviewed from both hardware and software s... View full abstract»

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  • 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 (228 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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  • Large-signal control algorithm for buck-derived high-power switching cells

    Publication Year: 1988, Page(s):206 - 212
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A novel large-signal control algorithm for buck-type derived power processing cells has been proposed. It is efficient in protecting the power switch during the turn-on and short-circuit transients and features an inherent feedforward of the input voltage. The implementation of the proposed algorithm can be realized by a very simple analog processor comprising only summing networks and comparators... 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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  • Design and evaluation of a stand-alone PV system with fuel generator back up

    Publication Year: 1988, Page(s):353 - 359
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The authors describe the design of stand-alone photovoltaic hybrid generators for supplying energy to telecommunication equipment to be installed in remote Italian areas. After a brief description of the photovoltaic system, they examine the individual components, including the photovoltaic module DC/DC converter, the DC generator, and the microprocessor control. Particular emphasis is given to th... View full abstract»

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  • Development of 450 kVA triport UPS system

    Publication Year: 1988, Page(s):531 - 535
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The development of a triport UPS (uninterruptible power system) rated at 450 kVA in three-phase that combines three units of triport UPSs, each rated at 150 kVA in three-phase, in parallel connection has been completed. With multiple units of triport UPSs running in parallel, the rule of proportionality to kVA's can be true for load distribution and it simplifies the design of a system containing ... View full abstract»

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  • Reliability analysis of a direct parallel connected n+1 redundant power system based on highly reliable DC/DC modules

    Publication Year: 1988, Page(s):551 - 556
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    An n+1 redundant system using modular hybrid DC/DC converters connected in parallel where the normally associated isolation diodes are omitted is described. Reliability and efficiency analysis of the systems was performed, based on a comparison between the system described and a system based on a conventional (uninterruptible power system) UPS with added redundant functions. It is conclud... View full abstract»

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  • The use of phase change chemicals for reserve cooling and energy conserving cooling systems in telecommunication equipment buildings

    Publication Year: 1988, Page(s):272 - 279
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    The authors outline Telecom Australia's development work and achievements in the use of the relatively high latent heat of fusion and thermal storage of phase change chemicals (PCC). Novel PCC applications, which have been successfully implemented into the Australian telecommunications network, relate to the use of PCC encapsulated in 1 m long plastic tubes to provide room temperature control afte... View full abstract»

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  • The impact of ISDN on Japan's telecommunications power system

    Publication Year: 1988, Page(s):17 - 24
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    The authors describe the state of ISDN (integrated services digital network) services in Japan and discuss issues concerning power supply systems suitable for the ISDN age. A distributed power supply system has been developed to solve the problems posed by centralized systems in telephone offices when ISDN systems are adopted. A compact, thin board-mounted DC-DC converter for a digital switch syst... View full abstract»

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  • Water-cooling applications for telecommunications and computer energy systems

    Publication Year: 1988, Page(s):441 - 447
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The authors note that water cooling of power supplies has proven to be a viable alternative to air cooling in computer applications and should be given serious consideration by the designers of telecommunications equipment, especially where the electronics are densely packaged. The design of a water-cooled, 725 A switched-mode power supply is used as a vehicle to demonstrate the basic problems enc... View full abstract»

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  • Valve regulated lead acid batteries-gas and heat management

    Publication Year: 1988, Page(s):89 - 96
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    Hydrogen and oxygen evolution are unavoidable secondary reactions in lead-acid batteries and these reactions imply increased heat production in the cell. Gas evolution is discussed with respect to open-circuit situations, float charging, and cycling. Heat-production processes are then considered, in connection with the heat of reaction, the Joule effect, and heat production during floating. Heat d... View full abstract»

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  • Compression technology applied to the construction of primary grounding systems

    Publication Year: 1988, Page(s):487 - 493
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    The authors describe the experience and advantages of compression connector technology as an alternative to the exothermic welding process in the construction of primary grounding systems for central offices. It is noted that outside plant personnel are becoming familiar with compression methods and applying them to such areas as utility steel strand grounding, towers, and grounding electrodes as ... View full abstract»

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  • Modern battery installation

    Publication Year: 1988, Page(s):382 - 387
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    Various aspects of the installation of stationary lead-acid batteries are examined, including performance improvement, the gassing situation, electrolyte effects, heat generation, and the relationship between floor-space demands and power demand. It is concluded that the safety rules against electric shock and impacts of short circuits require special design methods. Among other results, it is fou... 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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