INTELEC '84 - International Telecommunications Energy Conference最新文献_第3页

Unity Power Factor off Line Switching Power Supplies 统一功率因数离线开关电源

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794147

R. Keller, Gary Baker

引用次数: 35

Hybrid PV Systems for the use of Total Solar Energy 利用全太阳能的混合光伏系统

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794133

Paulo Rozsa

{"title":"Hybrid PV Systems for the use of Total Solar Energy","authors":"Paulo Rozsa","doi":"10.1109/INTLEC.1984.4794133","DOIUrl":"https://doi.org/10.1109/INTLEC.1984.4794133","url":null,"abstract":"Studies have shown the advantages of the \"solar-Diesel\" hybrid systems compared to other models of fuel savers for telecommunication stations distant from commercial power lines. With a much smaller initial investment, practically the same reliability can be obtained as with 100 percent solar solutions. The idea is to put to use all the available energy of the sun with fewer solar panels (curve 2 on Fig. l), which may be called \"Total Solar Energy System\". Of course, it is necessary to maintain within the limits of a reliable operation the minimum state of charge of the battery. In practice this can be achieved by the use of a battery charger (Diesel-group or other) and a control system. The results are shown in two different diagrams, which can be used to make the project of hybrid solar systems. The formulas permit us to calculate, for a given site and system, all operational characteristics such as: - state of charge of the battery at the end of each month - monthly number of operation and operating time of the charging group - economy in fuel compared to 100% Diesel system Practical data and results in Brazil have proved the theory. (The above idea was first presented to the Commission of Alternative Energy Sources of Telebras in February 1981. It was partly published in Portuguese in the quarterly publication Revista Telebras in its September 1983 issue).","PeriodicalId":132848,"journal":{"name":"INTELEC '84 - International Telecommunications Energy Conference","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130190422","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}

引用次数: 1

A High Performance PWM Inverter for UPS Applications 一种用于UPS应用的高性能PWM逆变器

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794143

C. Arikan, B. Saribatir

引用次数: 0

Remote Supervision of Power Plants 电厂远程监控

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794130

P. D. Madden

{"title":"Remote Supervision of Power Plants","authors":"P. D. Madden","doi":"10.1109/INTLEC.1984.4794130","DOIUrl":"https://doi.org/10.1109/INTLEC.1984.4794130","url":null,"abstract":"One of the most critical pieces of equipment in any telecommunication operation is the power plant. However, it has, in recent years, been one of the most neglected. At the same time, current economic pressures are further limiting the manpower available to monitor and maintairr this equipment. Operating companies may have numerous unmanned locations that are visited only once or twice a month and with only two or three remote alarms reserved for the power plant. With the advent of microprocessors and the ever declining costs of digital hardware, we now have the opportunity to add \"intelligence\" to these power plants at a justifiable expense. Alarms can be selectively annunciated rather than ganged; voltages and currents can be displayed in engineering units; rectifiers can be controlled for efficiency and reliability. All of this and more can be remotely supervised at any central location through either a \"dumb\" or \"intelligent\" terminal. The information can be displayed in any alphanumeric format familiar to the user. The intelligent system can be programmed to perform load studies, monitoring the duration of highs and lows and when they occur. It can be programmed to perform given control algorithms depending on the operating parameters of the power plant or of any equipment at the site. Examples of this could be rectifier switching, HVAC control or peak demand control to minimize utility expenses while maintaining the proper environment. The capabilities of such a system are numerous and limited only by the engineer's imagination and economic justification.","PeriodicalId":132848,"journal":{"name":"INTELEC '84 - International Telecommunications Energy Conference","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116373321","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}

引用次数: 1

A Distributed Power Architecture for the System 75 Digital Communications System System 75数字通信系统的分布式电源结构

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794108

P. R. Berkowitz, M. E. Jacobs, F. F. Kunzinger, R. Michelet

引用次数: 4

Low Maintenance Batteries in Combination with Battery Supervision System 低维护电池与电池监控系统的结合

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794095

H. Bohman, R. Elgh

引用次数: 1

Improved Power Transistorized Uninterruptible Power Supply 改进的功率晶体管不间断电源

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794144

Tadao Mizutani, Mikio Kato, O. Sato, Fred A. Cullun

引用次数: 1

Electromagnetic Compatibility in the Telecommunication Situation 电信环境下的电磁兼容性

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794126

P. Wilson, J. Coppinger

引用次数: 3

A 62.5 kVA 3-Phase Ferroresonant Transformer Cures Equipment Failures Caused by Severe Utility Interface Conditions 一种62.5 kVA三相铁谐振变压器解决了严重的实用接口条件引起的设备故障

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794123

J. Powell, E. Rhyne, G. Ward

{"title":"A 62.5 kVA 3-Phase Ferroresonant Transformer Cures Equipment Failures Caused by Severe Utility Interface Conditions","authors":"J. Powell, E. Rhyne, G. Ward","doi":"10.1109/INTLEC.1984.4794123","DOIUrl":"https://doi.org/10.1109/INTLEC.1984.4794123","url":null,"abstract":"Unusual failure rates in satellite communications earth stations purchased by the Algerian government and steps taken to reduce fault occurrences are reviewed. Discussed in this case study are problems resulting from operation of tele-communications equipment in remote areas where 220/380 volt utility power experienced swings of 100 volts, transients ranged to 2000 volts, noise levels exceeded 60 volts, and harmonic distortion was sometimes greater than 20%. The primary causes of these power problems were electrical utility systems with marginal capability to meet demand, due to continuing industrialization programs. Environmental conditions also were a factor. Ambient temperatures to 60° C, and brief but violent electrical storms also contributed to equipment failures. This combination of hostile environment and unstable power resulted in excessive earth station downtime; Mean Time Between Failure (MTBF) was measured in days. After study of power conditions, and investigation of a variety of isolation devices, the project team decided on ferroresonance as the primary power conditioning technology. Custom transformers, based on an Uninterruptible Power Supply (UPS) three-phase ferro were designed and installed. This approach reduced voltage swings to acceptable levels, provided the necessary transient suppression and produced distortion-free sine-wave power. These power conditioning systems have been operating satisfactorily for some seven years. This design proved to be the forerunner of one of today's most successful versions of power conditioning equipment. Since installation of the original systems, the concept has evolved into an even higher reliability, higher performance product.","PeriodicalId":132848,"journal":{"name":"INTELEC '84 - International Telecommunications Energy Conference","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1984-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127952296","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}

引用次数: 1

A Pulse-Width Controlled DC-DC Converter Powered by a Constant-Current Source 恒流源驱动的脉宽控制DC-DC变换器

INTELEC '84 - International Telecommunications Energy Conference Pub Date : 1984-11-01 DOI: 10.1109/INTLEC.1984.4794167

K. Kuwabara, Tomoo Suzuki

引用次数: 7