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Telecommunications Energy Conference, 1983. INTELEC '83. Fifth International

Date 18-21 Oct. 1983

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Displaying Results 1 - 25 of 109
  • Fifth International Telecommunications Energy Conference

    Page(s): 1
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  • Copyright page

    Page(s): 2
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  • Welcome to INTELEC 83

    Page(s): i
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    Freely Available from IEEE
  • Organization of INTELEC 83

    Page(s): ii - iii
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  • Intelec Advisory Committee

    Page(s): iv
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  • Intelec Executive Committee

    Page(s): iv
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  • [Acknowledgements]

    Page(s): V
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  • Table of contents

    Page(s): vi - xi
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  • Evolving Central-Office Powering Architectures

    Page(s): 1 - 5
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (5686 KB)  

    This paper reviews the forces and trends that have an impact on the evolution of exchange telecommunication networks and the effect each of these may have on central-office power systems. Alternative powering architectures are discussed, with considerations highlighted for each. No prediction is made as to which of the power architectures will dominate; this will depend on the evolution of various technologies and on economics. View full abstract»

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  • Microprocessor Control System for Large Power Plants

    Page(s): 6 - 12
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6178 KB)  

    A general purpose control and monitoring system for power plants has been developed by ERICSSON, Sweden. Based on distributed microcomputers the system is implementable not only in Power Supply Plants but also in the other systems involved in generation conversion, storage and transportation of energy in conjunction with a telecommunication plant. The system has been named ERICSSON ENERGY-MASTER and is able to perform the internal control and monitoring functions for the subsystems included in a complete Telecommunication Energy Plant. The system may be used stand-alone as a Telecommunication Energy Management System with remote operation facilities or as an interfacing subsystem to a Telecommunication Network Operation and Maintenance System. This paper describes the basic structure of the system and some of its properties and applications. View full abstract»

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  • It's in the Air

    Page(s): 13 - 20
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6593 KB)  

    This paper deals with the state-of-the-art of the areas windturbines and power supply for remote telecommunications systems. The increasing reliability demands within the telecommunications industri necessitates improvement of all units in the system including the windturbine. To ensure the right development some calculation models for systemreliability must be employed. To ensure an optimal combination of windpower and back up power (hybrid configuration) an easy and quick method for determination of local windpower potential is needed. Some different windspeed distributions and their use are shown, and the influences at the local windenergy potential, from shelter, roughness of the surface, and topographical effects are discussed. View full abstract»

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  • PDF Not Yet Available In IEEE Xplore

    Page(s): 1
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  • PDF Not Yet Available In IEEE Xplore

    Page(s): 1
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  • Review of Cardiff Telephone Exchange Total Energy System After Three Years Operation

    Page(s): 21 - 26
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (5274 KB)  

    A self contained continuous power generation system as described at INTELEC 1979, was successfully commissioned and put into service in a major communications centre at Cardiff in Wales. The objective was to provide all telecommunications equipment and electrical building engineering services from a dual fuel engine-generating plant, and to recover waste heat energy to heat or cool the building. The plant, which is fully automatic, comprises five 1300kW engines using natural gas or diesel oil, and associated waste heat boiler and chiller systems. This paper reviews the functioning of the plant during its first three years of operation, and discusses the technical factors and further development of the system as experience was gained in the use of the plant. View full abstract»

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  • Reliability and Maintenance of Stationary Batteries

    Page(s): 27 - 34
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6460 KB)  

    In general, lead acid batteries are prefered for telecommunication application, they attain complete recharged even at the float voltage of 2.23 V/cell. The charging process is more efficient and the voltage gap between charge and discharge is smaller compared to nickel/cadmium batteries. Several checks are discussed, which are employed to guarantee proper performance of the battery during service life. View full abstract»

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  • State of the Art in DC-to-DC Converters

    Page(s): 35 - 42
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (8448 KB)  

    A survey on the state of the arts in the dc-to-dc converter is presented. A number of important problems underlying the converter are classified into two categories, one is solvable by the averaging method and the other is not. In general, the converter circuit itself should be stable in order to reduce the size of the converter by making its switching frequency high. As examples of size reduction, we show three kinds of converter circuit techniques in which magnetics plays a key role. The first deals with a high frequency magnetic amplifier to suppress the current surge in high speed switching, the second with a ferro-resonant circuit driven by a high frequency inverter and the third with a high frequency converter of megahertz order which is based on a multi-vibrator. In these examples, we show that the amorphous core is effectively used for magnetic components. View full abstract»

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  • Geode-An Electrical Energy Supply with High Availability

    Page(s): 43 - 49
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (5223 KB)  

    Project GEODE describes an electrical energy supply characterized by its very high availability. It is to be used in the PTT (French Telephone Company) telephone exchanges and is targeted for an unavailability of better than 10-6. In order to achieve this performance Merlin Gerin has adopted - a double bus bar architecture - remote controlled electrical equipment - a motor-generator set specifically designed for this project - computer assisted surveillance We present the overall reliability calculations for this project along with that for energy sources. The E.d.F (French Utility Company) network and the Motor-Generators. View full abstract»

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  • Power System of New International Switching Center of KDD

    Page(s): 50 - 55
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (4655 KB)  

    The power plant of the telecommunications center plays an important role in the telecommunications facilities from the view point of reliability and energy conservation. KDD (Kokusai Denshin Denwa Co., Ltd.) is now constructing the new international switching center. This paper describes the power system of this new switching center where an effort has been made to have the power system more reliable and to reduce the power consumption. View full abstract»

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  • Battery Charging Principles and Systems in use at the Swedish Telecommunications Administration - Present and Planned Installations

    Page(s): 56 - 61
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (5513 KB)  

    The charging methods for stationary accumulators for use in telecommunication installations have changed through out the years. The reason for this is not only the development and the achievements in the battery technology field and the new methods and components in the control area but also the better knowledge of demands and result of the operation and maintenance work in the field. From the administrations point of view it has become necessary to find solutions which balance procuring, operation, and maintenance costs. Some of the solutions, mainly for the smaller installations, are simple and cheap, while others are quite sophisticated and hence relatively costly. The paper intends to view the development in the area concerned and to give a closer information on some of our present and future applications. View full abstract»

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  • A Power Feed System for Optical Data Highway Systems

    Page(s): 62 - 68
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (4966 KB)  

    This paper describes the new power feeding system for remote terminals of an optical fiber data highway in buildings or on the premises. Our developed new power feeding system has features the following techniques to enhance reliability and design flexibility. (1) A combination of remote and local power feeding system is used. (2) This power feeding system can be applied flexibly for a larger scale system. (3) The remote power feeding system is duplicated. (4) This power supplies of the central terminal equipment(CTE) located adjacent to the computer are distributed in each functional block. (5) The remote power feeding unit contains saturable reactors operated in constrained mode, which are widely used as high reliable constant current device in submarine cable power feeding systems. (6) The remote power receiving unit contains ringing choke converter because of their simple circuit features. View full abstract»

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  • PDF Not Yet Available In IEEE Xplore

    Page(s): 1
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  • A Modular, Uninterruptible AC Power Plant for Telecommunication Loads

    Page(s): 69 - 75
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    After a brief analysis of the power requirements of various telecommunication AC load this paper describes some different uninterruptible power plants presently adopted and compares them from the point of view of performances and reliability. It is then presented a type of uninterruptible AC power plant installed in many SIP (Italian Operating Telephone Company) exchange officies. It is characterized by high modularity and reliability, coupled to an unusually high power efficiency, taking into account the low voltage level of the DC link. The results of many years of experience with this type of equipments are reported, confirming the validity of the chosen solution. View full abstract»

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  • New Uninterruptible Power Supply System for Satellite Communication

    Page(s): 76 - 83
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (8570 KB)  

    This paper deals with new uninterruptible power supply (UPS) system for satellite communication, delivered to Kokusai Denshin Denwa Co., Ltd. Sophisticated operation and transfer techniques of the system consisting of two UPS units and two bypass units to improve system availability are described. Microcomputerized 150 kVA GTO UPS unit which provides excellent characteristics, waveform recording and fault diagnosis function is also introduced. View full abstract»

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  • DC-to-AC Power Converter for Fuel Cell System

    Page(s): 84 - 91
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (7835 KB)  

    As the interface between fuel cells and the utility line, a self-commutated inverter is preferred to a line-commutated inverter because of its easy controllability. Using the gate turn off (GTO) thyristors, this inverter can have high efficiency and simple circuit configurations. This paper describes the design features and test results of the dc-to-ac power converter, which is principally composed of four-phase transistor chopper and 12-pulse GTO inverter, for a 50kW experimental fuel cell power system. Furthermore, new GTO inverter which improves the circuit efficiency is presented. Special emphasis is placed on a detailed analysis and evaluation of this GTO inverter. View full abstract»

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  • GTO Inverter for Uninterruptible Power System

    Page(s): 92 - 99
    Save to Project icon | Click to expandQuick Abstract | PDF file iconPDF (6752 KB)  

    Data communication, satellite communication and other communication facilities commonly use an uninterruptible power system (UPS) for their critical AC power supplies. The requirements of the recent move toward energy conservation have led to a demand for higher efficiency in these UPS's. This paper describes the actual use the first UPS employing gate turn-off thyristors (GTO) with self-quenching functions in the DC to AC inverter main switching elements, the heart of a UPS. The UPS has such characteristics as high efficiency, higher overload capability, low audible noise and small size. First this paper describes the selection of power semi-conductor and then the new technology for the GTO inverter, and the actual applications of the UPS etc., also are explained. View full abstract»

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