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Telecommunications Energy Conference, 1979. INTELEC 1979. International

Date 26-29 Nov. 1979

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Displaying Results 1 - 25 of 93
  • International Telecommunications Energy Conference

    Publication Year: 1979, Page(s): i
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  • Copyright page

    Publication Year: 1979, Page(s): ii
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  • Greetings!

    Publication Year: 1979, Page(s): iii
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  • 1979 Intelec Management Committee

    Publication Year: 1979, Page(s): iv
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  • Intelec Advisory Committee

    Publication Year: 1979, Page(s): iv
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  • Technical Program Committee

    Publication Year: 1979, Page(s): v
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  • Acknowledgements

    Publication Year: 1979, Page(s): v
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  • Table of contents

    Publication Year: 1979, Page(s):1 - 4
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  • Future Trends of DC Power Plants

    Publication Year: 1979, Page(s):1 - 5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4602 KB)

    In this paper an attempt is made to derive some major future trends for telecommunication power plants out of technological progress and some of the worldwide political processes. The main stress is laid on trends of some degree of universal applicability and thus detailed analysis of e.g. circuit solutions is avoided. General trends, system trends and trends for system components like rectifiers,... View full abstract»

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  • A Standardized Power Approach for the Univac Data Processing Product Line - Present and Future

    Publication Year: 1979, Page(s):6 - 14
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    This paper will analyse the power requirements of a general computer system as well as a particular Univac product related to distributed communications processing. Some general criteria for power levels and quality will therefore be developed. Utility requirements and governmental codes (UL, CSA, IEC, VDE, etc.) will be discussed. To provide the power level density and quality required by present... View full abstract»

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  • Development of Converters in NTT

    Publication Year: 1979, Page(s):15 - 22
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    This paper discribes power converters used and in the research phase in NTT. Nowadays, almost all converters are semiconductor converters. Since they are efficient, small and reliable, they are used in many telecommunication systems. Recent progress in the telecommunication systems enhances the requirement for further converter development. Studies on converters have been continued to minimize siz... View full abstract»

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  • Battery Options for Standby Power

    Publication Year: 1979, Page(s):23 - 29
    Cited by:  Papers (1)
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    Future trends within the industry are considered, and recent developments in batteries are reviewed, including improved lead acid designs, sodium sulphur and advanced primary batteries. By the very nature of the reliability and long service life requirements, technological change and the introduction of new battery types is a slow process. Apart from certain emergency power systems that require pa... View full abstract»

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  • Power Supplies for Telecommunications in Remote Areas

    Publication Year: 1979, Page(s):30 - 37
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (7012 KB)

    Repeater stations in telecommunication networks are often located in unpopulated areas without a developed infrastructure or a public power supply. D.C. power must be supplied by electric power generating equipment at each station. In addition to the well established means of generation, pew methods are finding increasing application. Photovoltaic, wind energy and fuel cell systems will be describ... View full abstract»

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  • Underwriters Laboratories Approach to Safety Evaluation of Telephone Power Supplies

    Publication Year: 1979, Page(s):38 - 41
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    First Page of the Article
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  • Automated Testing of Power Supplies

    Publication Year: 1979, Page(s):42 - 48
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    The paper describes the hardware and software methods used to effectively test and diagnose DC to DC converters. The design requirements for the programmable sources and loads are described and the measurement schemes for ripple and alarm tests. The converter test set is presented as a part of a larger computer aided manufacturing sytem with two levels of hierarchy that follows the product from th... View full abstract»

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  • Non-Destructive Testing of Telephone Stationary Batteries

    Publication Year: 1979, Page(s):49 - 52
    Cited by:  Papers (5)  |  Patents (1)
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    This paper describes a technique for monitoring positive plate growth of normal production lead-acid cells without damaging the cell. The measurement is done in conjunction with a temperature-accelerated aging program. The method is based upon the use of a `reflectoscope', a sonar based instrument which can externally measure the distance between the end of each positive plate and the inside jar w... View full abstract»

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  • Battery Plants with Built-in Voltage Test Capabilities

    Publication Year: 1979, Page(s):53 - 60
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    A total battery plant system consisting of rectifier/chargers and a voltage control and distribution bay is discussed. The rectifier/chargers each have built-in provisions for testing and adjusting their high and low voltage alarms and their high voltage shutdowns without removing them from service or affecting their outputs during the testing sequence. Likewise, the voltage control and distributi... View full abstract»

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  • Low Voltage Testing

    Publication Year: 1979, Page(s):61 - 65
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    The author has been working on improved methods of conducting low voltage testing of electronic telephone switching equipment. The problems with existing techniques are discussed, together with a description of voltage reduction equipment being developed to eliminate these problems. View full abstract»

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  • "Electronic Universal Load"

    Publication Year: 1979, Page(s):66 - 73
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    This paper deals with the specifications, characteristics, functions, and examples of applications of the Electronic Universal Load developed for use in the developement of power supply units, their testing and income inspection. The function of controlling load current by entering a BCD code permits, among other functions, automatic testing through connection to a computer. This paper gives a det... View full abstract»

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  • Impulse Strength Measurement: A New Technique for Analyzing Power-Supply System Performance Under Actual Field Conditions

    Publication Year: 1979, Page(s):74 - 80
    Cited by:  Papers (2)
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    "Impulse Strength" is a relatively new parameter, having been defined officially as "the area under the amplitude-time relation for the impulse". In power systems, impulse strength is measured in volt-seconds, and it can be a critical factor in determining the "worst-case" performance of power-supply regulators, "line conditioners," or so-called "uninterruptible" systems. Mathematical analysis of ... View full abstract»

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  • Effect of Semiconductor Devices on the Power Dissipation of Telephone Communications Systems

    Publication Year: 1979, Page(s):81 - 85
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4963 KB)

    Sixty percent of telephone communication equipment power is consumed by the line circuits, 20% by the power supplies and 20% by the common control circuits. In general, line-circuit dissipation is decreasing as more Large Scale Integration (LSI) is introduced, due to special power saving circuits. Powering down under microprocessor control, derating of power devices and use of VMOS will reduce pow... View full abstract»

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  • Surge Protection Techniques in Low-Voltage AC Power Systems

    Publication Year: 1979, Page(s):86 - 93
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    Designers involved in the ac power side of telecommunications equipment have been justifiably concerned with surge protection because field experience is rich in case histories of failures attributable to transient overvoltages. Insufficient knowledge of the exact nature of these overvoltages, however, has made their task difficult in the past. After several years of data collection by a number of... View full abstract»

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  • Current Transformer Application for Power Switching Transistor Drive

    Publication Year: 1979, Page(s):94 - 99
    Cited by:  Papers (5)
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    Current transformers present inherent advantages for driving power switching transistors over alternative driving methods. This paper presents advantages and design problems of current transformer drives in two applications: a) free running push-pull inverter b) switched mode regulator Each application is discussed with respect to: Driver circuit application Design problem analysis of 20 kHz curre... View full abstract»

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  • Application of ASCR in 40-KHz Sine-Wave Converter

    Publication Year: 1979, Page(s):100 - 107
    Cited by:  Patents (1)
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    Efficient bulk power conversion from a 140-volt battery source to 48 volts dc can be accomplished by using ASCR's (Asymmetrical Silicon Controlled Rectifiers) in a 70-kHz series resonant circuit that operates at a repetition rate of 40 kHz. This paper describes a dc-to-dc converter that can deliver 2.5 kilowatts output power with an efficiency greater than 80 percent using a pair of S7310M's conne... View full abstract»

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  • Application of 40 KW Power Darlington Transistors in Large DC to DC Converters and Motor Speed Control

    Publication Year: 1979, Page(s):108 - 113
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3570 KB)

    General Electric Company has developed the D67D (a high speed darlington) power transistor rated at 400 Volts (sustaining) and collector currents of 100 Amps continuous (160 Amps peak). The devices are monolithic and utilize a new power package which is available in the isolated (R¿JC = .4°C/W max.) and non-isolated (R¿JC = .25°C/W max.) collector configurations. Some typ... View full abstract»

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