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Data circuit surge protection 数据电路浪涌保护
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171266
F.A. Larmier
{"title":"Data circuit surge protection","authors":"F.A. Larmier","doi":"10.1109/INTLEC.1990.171266","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171266","url":null,"abstract":"Sources of overvoltage surges posing threats to digital equipment are discussed. The ideal protection for data circuits must have high discharge capacity, fast response time, precise clamping voltage, and be almost transparent on the line. Those characteristics are obtained with hybrid circuitry which is made of a gas tube on the input stage and a diode on the output stage. Once the surge passes the primary protector without being stopped, it is clamped down by the solid state diode first, and then the bulk of the energy (99%) is handled by the gas tube. The diode provides a response time in the range of 1 nanosecond. It handles only 1% of the total energy dissipated. The diode must have a tight clamping ratio in order to reduce as much as possible the risk window. Location of the data circuit surge protector and installation precautions are discussed.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125970441","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: 3
A novel high frequency PWM push-pull inverter generates sinusoidal output voltage at 50 Hz 一种新型的高频PWM推挽逆变器产生50 Hz的正弦输出电压
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171222
S.R. Narayana Prakash, P. A. Ananda Mohan, B. Iyengar
{"title":"A novel high frequency PWM push-pull inverter generates sinusoidal output voltage at 50 Hz","authors":"S.R. Narayana Prakash, P. A. Ananda Mohan, B. Iyengar","doi":"10.1109/INTLEC.1990.171222","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171222","url":null,"abstract":"Two new topologies are presented for a single-phase PWM push-pull inverter with sinusoidal output voltage at 50 Hz. The inverter comprises power MOSFETs, fast recovery diodes, ferrite core transformers, and compact resonant filters tuned to twice the switching frequency of 25 kHz. It has high power-to-weight ratio, low total harmonic distortion and good output voltage regulation for both input voltage and load current variations. Inverter operation as well as details of simulation using SPICE 2.G are described.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114316700","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: 4
A novel 3 kVA UPS using a switch mode rectifier 采用开关整流器的新型3kva UPS
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171277
K. Hirachi, H. Yamamoto, M. Sakane, Y. Tomokuni, Y. Nagai
{"title":"A novel 3 kVA UPS using a switch mode rectifier","authors":"K. Hirachi, H. Yamamoto, M. Sakane, Y. Tomokuni, Y. Nagai","doi":"10.1109/INTLEC.1990.171277","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171277","url":null,"abstract":"The development is reported of a high-performance 3 kVA uninterruptible power supply (UPS) which employs a high-frequency, high power factor rectifier called a switch-mode rectifier (SMR) in the rectifier section and a high-frequency multi-PWM type inverter in the inverter section. This has brought about such excellent characteristics as compact and lightweight design, fast response, high efficiency, and high power factor. The authors describe the main circuitry control methods for starting, stopping, and steady-state SMR operation and the test results of the UPS.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133447461","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: 7
Quality=recoverability: the power equation 质量=可恢复性:功率方程
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171292
G. Comparetto
{"title":"Quality=recoverability: the power equation","authors":"G. Comparetto","doi":"10.1109/INTLEC.1990.171292","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171292","url":null,"abstract":"Bell Atlantic's Chesapeake & Potomac Telephone Companies have created a review program to assess the quality of power system engineering, installation, and maintenance and the ability of the power equipment to function in emergency situations. The program has evolved into two divisions: the power systems engineering and operational review and the quality assurance review. Key elements of the program are based on existing practices and the pragmatic knowledge of the people conducting the review. Both reviews are an intensive examination of a power system's engineering arrangements and operational capability. Each review is conducted by a team of representatives from the power engineering, building design engineering (electrical), and switching maintenance disciplines. In addition to the core members, most review teams include selected central office personnel, an equipment mechanic, and an electrician. The review program has provided benefits in these key areas: (1) identification of potential service failure conditions, (2) containment of costs/realization of savings, and (3) collection and dissemination of information. These and other benefits of the program, including exchange of data on needs and concerns among the three disciplines, are examined.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114770862","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: 0
An attractive new converter topology for AC/DC, DC/DC & DC/AC power conversion 一个有吸引力的新的转换器拓扑，用于AC/DC, DC/DC和DC/AC功率转换
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171313
G. Cimador, P. Prestifilippo
{"title":"An attractive new converter topology for AC/DC, DC/DC & DC/AC power conversion","authors":"G. Cimador, P. Prestifilippo","doi":"10.1109/INTLEC.1990.171313","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171313","url":null,"abstract":"A new power converter topology is proposed. The new converter is essentially a four-quadrant converter offering several advantages. These include high efficiency, reduced size and weight, excellent dynamic performance, and inherent galvanic isolation. The new topology proposed has the potential for a wide range of applications such as: inverters, rectifiers, and step-up step-down four quadrant converters for special applications. The key features as a rectifier are sinusoidal current absorption and unity power factor in both single-phase and three-phase operation. Special emphasis is given to the design of a 50 VA single-phase inverter for telecom applications (19 to 26 Hz ringing generator). The simplicity of the scheme proposed allows galvanic isolation between DC source and AC load without the requirement for a low-frequency transformer or DC/DC preregulating stage. In addition, a new diagram for a single-phase and three-phase rectifier based on the same principle is described in detail.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115754735","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: 11
Thermal requirements for electronic equipment cabinets exposed to outdoor environments 外露电子设备机柜的热要求
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171306
T.G. Volk
{"title":"Thermal requirements for electronic equipment cabinets exposed to outdoor environments","authors":"T.G. Volk","doi":"10.1109/INTLEC.1990.171306","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171306","url":null,"abstract":"Criteria for the design of sealed, outdoor electronic cabinets are discussed. In particular, the focus is on determining the impact of solar radiation and outside air temperature on the internal cabinet environment. The effect of materials, finishes, and insulation on the penetration of solar radiation is shown, and design ideas for limiting solar effects are discussed. In addition to solar radiation, the author discusses how circulating fans in a sealed cabinet can lower internal air temperature, as well as some mechanisms for the removal of excess heat energy from the cabinet.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122877355","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: 3
Integrated operation system for telecommunications power equipment 电信电力设备综合运营系统
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171257
H. Yamamura, I. Kase, H. Ikebe
{"title":"Integrated operation system for telecommunications power equipment","authors":"H. Yamamura, I. Kase, H. Ikebe","doi":"10.1109/INTLEC.1990.171257","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171257","url":null,"abstract":"Nippon Telegraph and Telephone Corporation (NTT) has developed ALICE (Advanced power Plants Integrated maintenance Control systEm), an intelligent system for operating telecommunications power equipment. This system performs not only centralized supervision and control functions, but also information processing (relational database and data communications tasks) and diagnostic functions. It accomplishes diagnoses by applying expert system technology to power equipment. The system is provided with a common standard structure and open communication protocol (OSI) procedure to accommodate the total operations systems of the future. It is equipped with an improved intelligent human-machine interface and preventive system maintenance functions. ALICE can supervise and control up to 210 telephone offices. It can measure up to 96 equipment points (e.g., heat, voltage, amperage for equipment) and monitor up to 576 alarms through remote transmitting equipment in each office. The authors describe the system configuration of ALICE, and explain its system functions for supervision and control, maintenance improvement, database/data communications, expert system diagnostics, and wide-area maintenance support. Issues related to a total integrated operation system are discussed.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121975853","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: 7
Photovoltaics and cycling diesels produce reliable efficient power 光伏和循环柴油发电产生可靠的高效电力
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171297
D. Tindall
{"title":"Photovoltaics and cycling diesels produce reliable efficient power","authors":"D. Tindall","doi":"10.1109/INTLEC.1990.171297","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171297","url":null,"abstract":"Field results show that single or dual cycling diesel-electric generator sets combined with photovoltaics can realize up to 70% savings in fuel costs and 40% savings in maintenance costs over a conventional prime power diesel system. Targeted for remote power applications in the range of 200 to 50000 watt (average) load, this power concept takes advantage of the large peak-to-average load demand ratios encountered in these sites. This hybrid power system can be retrofit to existing power plants, providing an extremely cost effective solution to rising fuel and maintenance costs. Two system architectures, for DC and AC loads, are presented along with photovoltaics/diesel sizing considerations, battery sizing, component selection issues and the data on load vs cycle performance. Future trends in the remote power industry are outlined.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132352511","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: 0
Power distribution scheme for the KDD's new international telecommunications center KDD新国际电信中心的配电方案
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171227
T. Kurane
{"title":"Power distribution scheme for the KDD's new international telecommunications center","authors":"T. Kurane","doi":"10.1109/INTLEC.1990.171227","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171227","url":null,"abstract":"Consideration is given to the power distribution scheme of the new international telecommunications center. A comparison is made between the conventional centralized power architecture and the new decentralized type. The comparison is made carefully taking account of major parameters: reliability, cost, influence of power damage, the space occupied, and efficiency. The authors have concluded that a centralized type of power system is the most favorable at present because of lower cost and the smaller amount of space required.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129844894","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: 0
A switched-mode 200 A 48 V rectifier/battery charger for telecommunications applications 一种开关模式200a 48v整流器/电池充电器，用于电信应用
12th International Conference on Telecommunications Energy Pub Date : 1990-10-21 DOI: 10.1109/INTLEC.1990.171233
T. Vescovi, N. Vun
{"title":"A switched-mode 200 A 48 V rectifier/battery charger for telecommunications applications","authors":"T. Vescovi, N. Vun","doi":"10.1109/INTLEC.1990.171233","DOIUrl":"https://doi.org/10.1109/INTLEC.1990.171233","url":null,"abstract":"A 200 A rectifier has been specifically designed to power telephone switching equipment. It is a constant-voltage, current-limited PWM SMPS (switched-mode power supply) with instrumentation and other features suitable for this type of application. A controlled rectifier utilizing MOSFET switches converts the 3-phase-input AC power to a regulated 400 V DC supply. The switching scheme ensures that the input current waveforms are sinusoidal. A forward converter then transforms the 400 volt supply to the regulated 48 volt nominal output required for this application.<<ETX>>","PeriodicalId":264940,"journal":{"name":"12th International Conference on Telecommunications Energy","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1990-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131167935","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: 11
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