By Topic

10th International Telecommunications Energy Conference

Oct. 30 1988-Nov. 2 1988

Filter Results

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
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral analysis of input currents of delta PWM converters using discrete Fourier transform

    Publication Year: 1988, Page(s):513 - 521
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The authors present the input current harmonic analysis of delta-modulated converters. The analysis is based on the discrete Fourier transform of sampled input current waveforms of various converters. The converter configurations considered include the AC-AC voltage controller, the controlled rectifier, and inverters. The use of the discrete Fourier transform in waveform analysis is associated wit... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMI control, a fundamental request of a power supply design

    Publication Year: 1988, Page(s):508 - 512
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The author describes the importance of an EMI (electromagnetic interference) controlled design of a power supply. He argues that in this design it is necessary not only to examine the far-field emission, but also to specify limits for the near-field interference. He also presents typical emission sources of a power supply and examines the possibilities of preventing or attenuating these interferen... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • EMC considerations for telecommunications switching centres

    Publication Year: 1988, Page(s):500 - 507
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    The authors address the increasing impact of electromagnetic compatibility (EMC) requirements on the design of modern telecommunications switching equipment. Following a review of the environmental factors which have given rise to the increase of work on EMC, the impending European EMC Directive is introduced and compared with the legislative requirements in the US. The specific problems associate... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power calculations and grounding in EDP/UPS power networks

    Publication Year: 1988, Page(s):494 - 499
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    It is noted that, as a load, a computer system presents the designer with difficult task in terms of electrical feed dimensioning, especially in the TN-S and TN-C-S 3×230/400 V, 50 or 60 Hz network configurations. This extremely nonlinear load and its high in-rush currents and neutral wire current imposes extra requirements on the distribution network, its grounding, and UPS (uninterruptible... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Service life limitations of flooded lead acid batteries in UPS service

    Publication Year: 1988, Page(s):379 - 381
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The author describes difficulties that have evolved in the application of flooded lead-acid batteries to uninterruptible power systems (UPS) service. It is suggested that industry pressures for greater power densities appear to have resulted in developments that may have been counter-productive to the service life of the UPS cells. The high-current, short-term discharge characteristics that are de... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Safety of grounding systems

    Publication Year: 1988, Page(s):481 - 486
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    Problems connected with the grounding of central offices are discussed, and solutions are offered. Several examples are considered, including the case when a high-resistance connection exists between the grounding conductor and the distribution frame because of improper termination or faulty crimping View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Passive conditioning systems for temperature control in telecommunications equipment enclosures

    Publication Year: 1988, Page(s):368 - 373
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    The application of phase-change materials to the control of internal temperature in telecommunications equipment enclosures has resulted in the development of passive conditioning systems (PCS) which will maintain temperatures within equipment operating limits without the use of conventional air conditioning. PCS-equipped enclosures can readily protect electronic systems of up to 30 kW dissipation... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Power plant simulation using a computer aided test station

    Publication Year: 1988, Page(s):265 - 271
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    With the advent of the ACCLAIM series power plant controller/monitors, it has become necessary to produce more elaborate and more sophisticated tests to assure system integrity than is necessary for other plant controllers. The authors outline a computer-aided test (CAT) station designed as a developmental tool for the system testing of the ACCLAIM. They give the basic simulation requirements for ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • First results of an aimed research carried out by the Italian PT Ministry related to a prototypical photovoltaic hybrid power system for TLC

    Publication Year: 1988, Page(s):475 - 480
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    An experimental PV (photovoltaic) plant integrated with a diesel electric generator (DEG) has been implemented in the ISPT (Istituto Superiore PT). A year and a half after its installation the first experimental phase aimed at investigating the problems related to multisubsystem assembly has been achieved. The authors report on the charge adjusting system from PV to battery, control criteria on th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A microprocessor based controller for remote site PV systems including hardware design criteria and advanced control algorithms

    Publication Year: 1988, Page(s):360 - 367
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors evaluate the performance of a microprocessor-based controller developed for remote-site photovoltaic (PV) systems. They also review ongoing advances in the concept of intelligent controls. It is concluded that a reliable microprocessor-based power system controller offers significant advantages over analog controls for remote site PV and PV hybrid systems. The digital control logic all... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Solar PV-thermoelectric generator hybrid system: case studies

    Publication Year: 1988, Page(s):308 - 311
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A solar photovoltaic (PV) thermoelectric generator (TEG) hybrid system combines the economics of a solar photovoltaic system with the reliability and heating capability of a thermoelectric generator system. The solar system provides power during seasons with abundant sunshine while the thermoelectric generator system provides power and heat as required during seasons with insufficient solar insola... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Data handling and modularity in a supervision system

    Publication Year: 1988, Page(s):251 - 256
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors describe some of the software aspects dealt with in the Ericsson Energy Master (EEM) power supervision systems. A general overview emphasizing the user interface was previously presented (see P. Samisoe and M. Eriksson, 1987). Features of local-computer, main-computer, and communication-computer data handling are discussed View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Remote operations of a plant for a telecommunications station

    Publication Year: 1988, Page(s):466 - 471
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The authors describe an experimental power station for a telecommunications exchange capable of being manned from a remote point. Features discussed include the configuration of the teleoperated station, the operation instructions (encompassing control levels/hierarchy, telesignals, and telemeasurements), and ways of interacting with the operator and availability for teleoperation. It is expected ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A compact board-mounted power supply module for telecommunications systems

    Publication Year: 1988, Page(s):201 - 205
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors describe the circuit and components of a compact board-mounted power supply module. A single-ended forward converter without a reset circuit reduces transformer size and circuit power dissipation. A simple, wideband optoisolation circuit extends the feedback loop bandwidth and reduces the size of the output smoothing filter. A low-profile surface-mounted transformer allows the power su... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Ringing, tone, and cadence requirements for nonswitched loads in digital central offices

    Publication Year: 1988, Page(s):326 - 333
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The author describes the residual load signals most often encountered and shows an example of a state-of-the-art residual ringing, tone, and cadence power plant based on digital and PWM (pulse-width modulation) techniques which operates in a space and cost-efficient manner. This plant is expandable to meet the need for increased output capacity, which is frequently not discovered until after the u... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Reducing EMI in switch mode power supplies

    Publication Year: 1988, Page(s):411 - 420
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    In general, as the operating frequency of a switch-mode converter increases, the task of EMI (electromagnetic interference) suppression becomes more difficult. Many times, a reduction in power supply size is negated by bulky input and output filters. Additional mechanical and printed circuit board design iterations have resulted due to EMI difficulties. With these difficulties in mind, the author ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.