The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Since 1972 the Greenland Telecom Service has been operating a 1500 km microwave radiolink from Cape Farewell to the Diskobay area on the westcoast of Greenland. This link system incorporates 25 unmanned, rather inaccessible repeater stations on mountain sites at heights from 100 to 1500 meters above sea level. The supply of such stations with the necessary electric power has created many problems...
This work, organized from a joint-research between Telespazio S.p.A. and Pragma S.p.A., deals with a photovoltaic energy system installed on the platform roof of Telespazio's building in Rome. The purpose of this experiment is to supply the receiving equipment of a television antenna; this feature is particularly interesting for many other applications too. After a brief description of the photovoltaic...
A photovoltaic (PV) system is an economical solution for power supply problems of telecommunication stations in rural areas. Photovoltaics is a new concept and consequently the standards and specifications have not yet been fully developed. This paper presents some aspects about specifying, sizing, and designing a PV-system. Also some experiences on carrying out a large telecommunication project with...
Until very recently, the electric power consumption of telecommunications earth stations was high. Presently, because of the new technologies implemented both in the equipment on board the satellites and in the earth stations, the power consumption of these stations for low capacity networks has substantially decreased and it is now possible to supply them by photovoltaic generators. This makes it...
A description is given of a monitoring and diagnostics system for UPS systems. The process data of the individual units are acquired and condensed by local computers. These data are transmitted via a serial bus to a central PC which displays them in the form of a block diagram and, in the event of a fault, analyses the cause of the trouble.
This paper describes some of the key features of a family of UPS products in the power range of 5 to 50 kVA, designed to meet the demands imposed upon an uninterruptible power supply by both the load and the user. The emphasis is on features implemented through the use of microprocessors in different parts of the UPS system, such as sinewave reference generaticn, bypass switch control and user interface.
The concept of closed loop programmable power is a spin-off of research work that is being spearheaded by the National Association of Home Builders in the United States in conjunction with the development of Smart House - a home of the future that combines the centralized microprocessor control of building systems and household appliances with the unified distribution of power and communications....
INTELEC provides a unique international forum where manufacturing industry and telecommunications operating companies (Telco's) can meet and discuss issues of mutual interest in the field of telecommunications energy. The majority of papers quite naturally present the latest technological developments from industry. Clearly there is a need also for the Telco viewpoint if we are to achieve a dialogue...
The reliability requirements for the power supply equipment in a telephone exchange must of necessity be high, since no telephone traffic is possible if there is a break in the power supply. Most power supply equipments are known for high reliability, but this does not mean that they do not need supervision and maintenance. This paper emphasizes the importance of preventive maintenance and gives examples...
Ericsson Power Systems, a division of RIFA AB, has, in collaboration with the Swedish Telecommunications Administration, developed and put into operation a computerized system for the supervision of energy equipment in telephone exchanges. The system, ERICSSON ENERGY-MASTER (EEM), allows centralized control of all energy equipment in a maintenance area, resulting in improved operating economy and...
Case studies resulting from power room monitoring performed by on-site microprocessor monitoring devices which are plooed by the Central Office Power Monitor System (COPM) are presented. Data Base Tabulations, graphs and alarm notification procedures fron the use of thisa system in use within 14 major Central Offices in the Bell of Pennsylvania. Liberty Region are described. These case studies detail...
To cater for increasingly sophisticated and discerning major businesses and corporations, modern office buildings have become more complex and their many services integrated. Integrated Building Services (IBS) can be defined generally as an array of facilities and services (sub-systems) which are provided for an office complex, a telecommunications centre, a data processing centre etc. and which are...
Electrical Power Systems (EPS) are essential subsystems in space systems. Either new or increased requirements in the frame of current projects influence design and technology for power generation. conditioning, distribution and energy storage. This paper, though, does not deal with these topics but with another new requirement, i.e. the introduction of intelligent controllers into the subsystem....
This paper describes a supervision and control system for power and environmental equipment at the NHK (Japan Broadcasting Corporation) Broadcasting Center. This system is a building management system, combining both the functions of power and environmental equipment organically. It is a computer-control system, intended for improved total performance, including improvement of equipment operation...
The first part of the paper outlines the purposes of the supervisory system of power supply equipment. It touches upon: - Contiunous monitoring of the batteries and static converters; - indicating both status or trouble alarm signals and measured values of the power performance as well as network menagement terminal of the supervisory centre; - remote controlled switch of redundancies. The paper describes...
The generating set department of Valmet Linnavuori Works, Finland, has during the last four years developed a new series of diesel generating sets, called Series V, in the output range of 30 to 180 kVA. The innovation came as a result of the development work, for which Valmet has taken out a patent and a protection of designs in many countries. The customer gets the real benefit of the new innovation...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.