Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794584
P. Samsioe, Martin Ericsson
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 greater reliability. EEM is a further development of Ericsson's previous system for processor control of power supply equipment (1).
{"title":"Supervision of Energy Plants in Telephone Stations","authors":"P. Samsioe, Martin Ericsson","doi":"10.1109/INTLEC.1987.4794584","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794584","url":null,"abstract":"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 greater reliability. EEM is a further development of Ericsson's previous system for processor control of power supply equipment (1).","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133144661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794574
C. Leclercq
{"title":"French Standards on Photovoltaic Systems","authors":"C. Leclercq","doi":"10.1109/INTLEC.1987.4794574","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794574","url":null,"abstract":"","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124700951","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794610
J. Galic, Ake Christensson
This paper describes some aspects in utilizing GTO's in a new UPS-convertor. Comparasion is made between convertors based on conventional thyristors. An unique protection system and a new snubber circuit are also described.
{"title":"The Application of GTO's to Convertors for UPS-Systems","authors":"J. Galic, Ake Christensson","doi":"10.1109/INTLEC.1987.4794610","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794610","url":null,"abstract":"This paper describes some aspects in utilizing GTO's in a new UPS-convertor. Comparasion is made between convertors based on conventional thyristors. An unique protection system and a new snubber circuit are also described.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"2016 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127507115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794614
Hans Vesterberg
A calculation model for heat transfer by natural convection from vertical parallel plates with chimney is presented. Results from applications on circuit boards as well as a plate fin cooler are presented. The model is also used for calculations on the circutation from the circuit boards to the cooler.
{"title":"Heat Transfer from the Packaging Structure to the Coolers using Natural Circulation","authors":"Hans Vesterberg","doi":"10.1109/INTLEC.1987.4794614","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794614","url":null,"abstract":"A calculation model for heat transfer by natural convection from vertical parallel plates with chimney is presented. Results from applications on circuit boards as well as a plate fin cooler are presented. The model is also used for calculations on the circutation from the circuit boards to the cooler.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116407974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794577
F. Delloye
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 possible to install low capacity telephone and television reception stations in geographically remote locations where no power source is available. Several such stations have already been built. The writer describes their characteristics, the equipment installed as well as the initial results obtained.
{"title":"Telecommunications Earth Stations Supplied by Solar Generators","authors":"F. Delloye","doi":"10.1109/INTLEC.1987.4794577","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794577","url":null,"abstract":"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 possible to install low capacity telephone and television reception stations in geographically remote locations where no power source is available. Several such stations have already been built. The writer describes their characteristics, the equipment installed as well as the initial results obtained.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130281008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794535
H. Matsuo, F. Kurokawa
A new hybrid power supply is presented to perform the precise regulation of multiple output voltages, which is composed of the improved forward type multiple-output converter as a preregulator and the continuous series regulators using MOS FET as voltage dropper. The steady-state and the dynamic cross regulation characteristics are analyzed and compared theoretically and experimentally on the conventional and improved forward type multiple-output converters. As a result, it is clarified that the improved forward type multiple-output converter is superior to the conventional one in the steady-state and dynamic cross regulation characteristics, and that the proposed multiple-output hybrid power supply has a sufficiently precise regulation characteristics of the multiple output voltages and a satisfactorily high power efficiency.
{"title":"A New Multiple-Output Hybrid Power Supply","authors":"H. Matsuo, F. Kurokawa","doi":"10.1109/INTLEC.1987.4794535","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794535","url":null,"abstract":"A new hybrid power supply is presented to perform the precise regulation of multiple output voltages, which is composed of the improved forward type multiple-output converter as a preregulator and the continuous series regulators using MOS FET as voltage dropper. The steady-state and the dynamic cross regulation characteristics are analyzed and compared theoretically and experimentally on the conventional and improved forward type multiple-output converters. As a result, it is clarified that the improved forward type multiple-output converter is superior to the conventional one in the steady-state and dynamic cross regulation characteristics, and that the proposed multiple-output hybrid power supply has a sufficiently precise regulation characteristics of the multiple output voltages and a satisfactorily high power efficiency.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125922589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794567
M. Grossoni, F. Bertoncini, R. Cofani
The development of electronic telecommunication systems and the offer of new services have pushed SIP (Italian Operating Telecommunication Company) to update the philosophy of its own power plants also taking into account the objectives of reducing installation, operation, maintenance and management costs. All the above requirements have rise to a new power plant for telecommunication systems realized with modularity characteristics and with integration of uninterruptible -48vd.c. (and/or -60Vd.c.) and 220Va.c. supplies. The paper includes all the electrical and mechanical characteristics and the advantages of the new power plant manufactured by C.E.T. S.p.A. (a Company of ALCATEL N.V. Group) indicating reliability data based on a significant sample taken from all over Italy.
{"title":"Extendible Modular New Power Plant for Uninterruptible D.C. and A.C. Supplies of Telecommunications Systems","authors":"M. Grossoni, F. Bertoncini, R. Cofani","doi":"10.1109/INTLEC.1987.4794567","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794567","url":null,"abstract":"The development of electronic telecommunication systems and the offer of new services have pushed SIP (Italian Operating Telecommunication Company) to update the philosophy of its own power plants also taking into account the objectives of reducing installation, operation, maintenance and management costs. All the above requirements have rise to a new power plant for telecommunication systems realized with modularity characteristics and with integration of uninterruptible -48vd.c. (and/or -60Vd.c.) and 220Va.c. supplies. The paper includes all the electrical and mechanical characteristics and the advantages of the new power plant manufactured by C.E.T. S.p.A. (a Company of ALCATEL N.V. Group) indicating reliability data based on a significant sample taken from all over Italy.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128863079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794625
H. Nishikawa, H. Wakabayashi, Masanori Sato
KOKUSAI DENSHIN DENWA CO., LTD. (KDD) will construct the transpacific optical fiber submarine cable system (TPC-3) between Japan, Guam and Hawaii in 1988, with AT&T. This system has a total system length of about 9000km. The power feed equipment (PFE), for long haul optical submarine cable system like as TPC-3, needs capability of feeding the large constant current, standing on the high voltage, maintaining high reliability and stability for 25 years and also provision of the functions for maintenance and operation. In order to evaluate the fundamental design and characteristics of high-voltage PFE for TPC-3 system, we developed the prototype PFE for optical submarine cable systems. This paper describes the design and test results of the prototype PFE.
{"title":"Power Feed Equipment for a Transoceanic Optical Fiber Submarine Cable System","authors":"H. Nishikawa, H. Wakabayashi, Masanori Sato","doi":"10.1109/INTLEC.1987.4794625","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794625","url":null,"abstract":"KOKUSAI DENSHIN DENWA CO., LTD. (KDD) will construct the transpacific optical fiber submarine cable system (TPC-3) between Japan, Guam and Hawaii in 1988, with AT&T. This system has a total system length of about 9000km. The power feed equipment (PFE), for long haul optical submarine cable system like as TPC-3, needs capability of feeding the large constant current, standing on the high voltage, maintaining high reliability and stability for 25 years and also provision of the functions for maintenance and operation. In order to evaluate the fundamental design and characteristics of high-voltage PFE for TPC-3 system, we developed the prototype PFE for optical submarine cable systems. This paper describes the design and test results of the prototype PFE.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124125111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794616
M. Tucker
Solid state, i.e. digital telecommunications systems, use computer technologies, and require computer grade, highly reliable environments for long life and optimum reliability. This paper addresses the requirements, selection, and major characteristics of close control, packaged air conditioning systems, developed specifically for computer and telecommunications environments. Presentation material is centred upon the Liebert System 3 environmental control units, over 100,000 of which are installed worldwide, in computer and telecommunication environments.
{"title":"Reliable, Energy Efficient, Close Control Environmental Systems for Telecommunications Rooms","authors":"M. Tucker","doi":"10.1109/INTLEC.1987.4794616","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794616","url":null,"abstract":"Solid state, i.e. digital telecommunications systems, use computer technologies, and require computer grade, highly reliable environments for long life and optimum reliability. This paper addresses the requirements, selection, and major characteristics of close control, packaged air conditioning systems, developed specifically for computer and telecommunications environments. Presentation material is centred upon the Liebert System 3 environmental control units, over 100,000 of which are installed worldwide, in computer and telecommunication environments.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121656204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1987-06-14DOI: 10.1109/INTLEC.1987.4794612
Karl Schmaus, Ferdinand Tiggemann
After thorough investigations the Federal Republic of Germany decided in 1979 to give priority to the digitization of the telephone network. Owing to this decision the Deutsche Bundespost began to introduce exclusively digital transmission systems for the regional long-distance network from 1982 onwards. As regards switching equipment, the Deutsche Bundespost decided after a successful trial operation of digital switching systems of one year to use digital long-distance switching systems on a regular basis from 1984 onwards and to introduce digital local switching systems for the first time half a year later. The actual coverage of the demand for digital switching systems in the telephone network thus began in 1986. The procurement transition phase is expected to last 5 years, that is to say that the Deutsche Bundespost intends to procure exclusively digital switching systems after 1990. The way towards an "integrated digital telephone network" (IDN) has thus been paved.
{"title":"Problems in Connection with the Change-Over from Analogue to Digital Switching Systems in Existing Deutsche Bundespost Buildings","authors":"Karl Schmaus, Ferdinand Tiggemann","doi":"10.1109/INTLEC.1987.4794612","DOIUrl":"https://doi.org/10.1109/INTLEC.1987.4794612","url":null,"abstract":"After thorough investigations the Federal Republic of Germany decided in 1979 to give priority to the digitization of the telephone network. Owing to this decision the Deutsche Bundespost began to introduce exclusively digital transmission systems for the regional long-distance network from 1982 onwards. As regards switching equipment, the Deutsche Bundespost decided after a successful trial operation of digital switching systems of one year to use digital long-distance switching systems on a regular basis from 1984 onwards and to introduce digital local switching systems for the first time half a year later. The actual coverage of the demand for digital switching systems in the telephone network thus began in 1986. The procurement transition phase is expected to last 5 years, that is to say that the Deutsche Bundespost intends to procure exclusively digital switching systems after 1990. The way towards an \"integrated digital telephone network\" (IDN) has thus been paved.","PeriodicalId":129305,"journal":{"name":"INTELEC '87 - The Ninth International Telecommunications Energy Conference","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134322230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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