Pub Date : 1988-10-30DOI: 10.1109/INTLEC.1988.22325
K. Suganthy, S. R. Bhat
The authors describe the developmental studies of a MOSFET-based three-phase inverter, operating from a 400 W photovoltaic power source. Many different drive circuits were tested and their limitations were studied. A three-phase MOSFET inverter was built and tested with an induction motor pump as a load. The inverter uses a pulsewidth-modulation technique to minimize the harmonic contents of the output waveform. A special purpose IC, HEF 4752, is used as a controller. The problem of obtaining a simple power supply for the electronic circuit is discussed, as the system operates from a 165 V (at an open-circuit voltage of 200 V) solar power source (without batteries).<>
{"title":"Studies on solar powered 3 phase MOSFET inverter","authors":"K. Suganthy, S. R. Bhat","doi":"10.1109/INTLEC.1988.22325","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22325","url":null,"abstract":"The authors describe the developmental studies of a MOSFET-based three-phase inverter, operating from a 400 W photovoltaic power source. Many different drive circuits were tested and their limitations were studied. A three-phase MOSFET inverter was built and tested with an induction motor pump as a load. The inverter uses a pulsewidth-modulation technique to minimize the harmonic contents of the output waveform. A special purpose IC, HEF 4752, is used as a controller. The problem of obtaining a simple power supply for the electronic circuit is discussed, as the system operates from a 165 V (at an open-circuit voltage of 200 V) solar power source (without batteries).<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127912916","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 : 1988-10-30DOI: 10.1109/INTLEC.1988.22345
A. Pietkiewicz, D. Tollik
A battery-fed multiple-output DC power supply system for telecommunication equipment is described. The system consists of several parallel autonomous power modules with load current sharing and 'n+1' redundancy. Each module contains two parallel double-output current-mode controlled forward converters with integrated output filter inductors. Primary attention is focused on the multiwinding inductor element. A simple and efficient design procedure is developed for the loose coupling of windings, which was found to be favourable from the viewpoint of the dynamic properties of the system.<>
{"title":"Redundant DC-DC switching power supply system for telecommunication equipment","authors":"A. Pietkiewicz, D. Tollik","doi":"10.1109/INTLEC.1988.22345","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22345","url":null,"abstract":"A battery-fed multiple-output DC power supply system for telecommunication equipment is described. The system consists of several parallel autonomous power modules with load current sharing and 'n+1' redundancy. Each module contains two parallel double-output current-mode controlled forward converters with integrated output filter inductors. Primary attention is focused on the multiwinding inductor element. A simple and efficient design procedure is developed for the loose coupling of windings, which was found to be favourable from the viewpoint of the dynamic properties of the system.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"445 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114048820","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22392
G. Marchetti, G. Orio, M. Piccolo, F. Sabbatini
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 that the completed plant will become part of a system of hierarchical supervision that could be extended to the entire network of national telecommunications.<>
{"title":"Remote operations of a plant for a telecommunications station","authors":"G. Marchetti, G. Orio, M. Piccolo, F. Sabbatini","doi":"10.1109/INTLEC.1988.22392","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22392","url":null,"abstract":"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 that the completed plant will become part of a system of hierarchical supervision that could be extended to the entire network of national telecommunications.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132787743","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22396
E. Perry, F. O'Loughlin, J. F. Rodrigues
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 a replacement for mechanical and exothermic connections. Compression devices are emerging to offer attractive alternatives for other mechanical and soldered joint applications such as cable shielding, pedestals, cable vaults, and lightning protection. The IEEE Standard 837 is examined, and issues of insertion loss and reflection are discussed.<>
{"title":"Compression technology applied to the construction of primary grounding systems","authors":"E. Perry, F. O'Loughlin, J. F. Rodrigues","doi":"10.1109/INTLEC.1988.22396","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22396","url":null,"abstract":"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 a replacement for mechanical and exothermic connections. Compression devices are emerging to offer attractive alternatives for other mechanical and soldered joint applications such as cable shielding, pedestals, cable vaults, and lightning protection. The IEEE Standard 837 is examined, and issues of insertion loss and reflection are discussed.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125586885","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22335
W. Brecht, S. Misra
The authors discuss the history and shortcomings of post seals in lead-acid batteries and the need for improved seal designs in sealed (recombinant) products. A model of the electrochemical processes of both creep and nodular types of post seal corrosion is presented. A recently developed vulcanized rubber post seal and representative generic mechanical compression and epoxy post seals are described. The apparatus and test parameters including a complete listing of all variables examined are detailed. Generalized and specific results of a comparative testing program are discussed for each of the three seal types. Based on the test results, an optimized configuration for each seal type is presented. The vulcanized rubber seal demonstrates the best overall performance in the comparative study and is chosen for further development including multiple temperature and polarization testing.<>
{"title":"Volcanized rubber post seal for lead-acid batteries-a new generic type","authors":"W. Brecht, S. Misra","doi":"10.1109/INTLEC.1988.22335","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22335","url":null,"abstract":"The authors discuss the history and shortcomings of post seals in lead-acid batteries and the need for improved seal designs in sealed (recombinant) products. A model of the electrochemical processes of both creep and nodular types of post seal corrosion is presented. A recently developed vulcanized rubber post seal and representative generic mechanical compression and epoxy post seals are described. The apparatus and test parameters including a complete listing of all variables examined are detailed. Generalized and specific results of a comparative testing program are discussed for each of the three seal types. Based on the test results, an optimized configuration for each seal type is presented. The vulcanized rubber seal demonstrates the best overall performance in the comparative study and is chosen for further development including multiple temperature and polarization testing.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133146111","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22369
E. Silverman
The author describes a study examining the feasibility of powering remote locations (controlled environmental huts, underground enclosures, or remotely located equipment in commercial office buildings) from the central office by using existing outside plant distribution cables made surplus by the use of fiber-optic technology. The most common source in a central office, -48 V, although attractive from an availability point, cannot provide sufficient voltage to overcome the loop voltage drop in 12000 feet of 22-gauge, 1100-pair cable at 75 A. Voltages such as 130 V can supply sufficient voltage to overcome the loop voltage drop since the current would be less for the same power in the transmission path. However, the using location is designed to operate with a voltage of -48 V, and DC-to-DC converters are needed to convert the voltage to -48 V. It is concluded that these types of converters are technically feasible (130 V to -48 V at 75 A) and could be obtained from power supply manufacturers. However, other technical factors, raise some concerns as to the practicality of powering remote locations from the central office. In addition, it is shown that the estimated cost to provide the 130 V to -48 V conversion equipment at the remote location and the central office source makes the use of central office power as a source of power to remote locations economically unreasonable.<>
{"title":"Powering remote locations from central offices","authors":"E. Silverman","doi":"10.1109/INTLEC.1988.22369","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22369","url":null,"abstract":"The author describes a study examining the feasibility of powering remote locations (controlled environmental huts, underground enclosures, or remotely located equipment in commercial office buildings) from the central office by using existing outside plant distribution cables made surplus by the use of fiber-optic technology. The most common source in a central office, -48 V, although attractive from an availability point, cannot provide sufficient voltage to overcome the loop voltage drop in 12000 feet of 22-gauge, 1100-pair cable at 75 A. Voltages such as 130 V can supply sufficient voltage to overcome the loop voltage drop since the current would be less for the same power in the transmission path. However, the using location is designed to operate with a voltage of -48 V, and DC-to-DC converters are needed to convert the voltage to -48 V. It is concluded that these types of converters are technically feasible (130 V to -48 V at 75 A) and could be obtained from power supply manufacturers. However, other technical factors, raise some concerns as to the practicality of powering remote locations from the central office. In addition, it is shown that the estimated cost to provide the 130 V to -48 V conversion equipment at the remote location and the central office source makes the use of central office power as a source of power to remote locations economically unreasonable.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"130 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122760292","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22399
R. Sigloch
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 interferences.<>
{"title":"EMI control, a fundamental request of a power supply design","authors":"R. Sigloch","doi":"10.1109/INTLEC.1988.22399","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22399","url":null,"abstract":"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 interferences.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130258602","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 : 1900-01-01DOI: 10.1109/INTLEC.1988.22317
A.G. Chynoweth
The author discusses some recent investigations at Bellcore's Applied Research Area (USA) which have centered on power supply issues which require serious attention if broadband service (600 Mb/s) is to become ubiquitous. He points out some of the issues involved and outlines the efforts Bellcore is taking to solve them.<>
作者讨论了最近在美国贝尔科应用研究中心(Bellcore's Applied Research Area)进行的一些研究，这些研究集中在宽带服务(600mb /s)普及需要认真关注的电源问题上。他指出了其中涉及的一些问题，并概述了贝尔科为解决这些问题所做的努力。
{"title":"Power in the all fiber network","authors":"A.G. Chynoweth","doi":"10.1109/INTLEC.1988.22317","DOIUrl":"https://doi.org/10.1109/INTLEC.1988.22317","url":null,"abstract":"The author discusses some recent investigations at Bellcore's Applied Research Area (USA) which have centered on power supply issues which require serious attention if broadband service (600 Mb/s) is to become ubiquitous. He points out some of the issues involved and outlines the efforts Bellcore is taking to solve them.<<ETX>>","PeriodicalId":169486,"journal":{"name":"10th International Telecommunications Energy Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115097807","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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