... the powers which are maximum under the conditions of retaining the superconducting state and of the steady-state stability of power transmission ...

... Title : High Voltage AC Power Transmission Lines and Communications Receiver Sites. Descriptive Note : Technical rept. May 75-Mar 76,. ...

This conference examined the following aspects of 750 to 1500 kV ac power transmission systems and equipment: trends in systems and equipment development; electric field measurements and the consideration of electric fields in EHV and UHV ac system design...

A short discussion of the effects of the Electromagnetic Interference (EMI) radiated from High Voltage AC (HVAC) Power Transmission lines on HF Communications Receivers is followed by the description of a method for choosing communications receiver sites ...

This bibliography represents an attempt to draw together an annotated listing of the literature on ac power transmission at 600 kV and above. All pertinent periodical articles, reports and conferences published from 1960 through 1967 have been included in...

A bibliography is presented of 747 abstracts of literature on ac power transmission at 600 kv and above. An author index is included. (LCL)

for the Kayenta 230 KV substation advanced series compensation," AC and DC Power Transmission IEEE Conference

... was developed and implemented to study these discharges under conditions found in proposed ac superconducting power-transmission lines. ...

The power quality on the transmission lines is less of a concern with an AC system. At the point of use (power distribution) we will need to use Delta to ...

A power grid is a transmission network transporting electrical energy from power plants to some substations near urban or industrial centers. To reduce the loss ...

A compact, easy to fabricate, noninductive, low surface magnetic field superconductor transmission line that has minimal stay fields is described.

The objective of the program was to study the feasibility of Nb3Ge being used as an AC superconducting power transmission cable material. Specifically, the program was to measure AC losses in available samples of Nb3Ge and find under what conditions the l...

The technical and economic assessment of AC and DC transmission systems; long distance transmission, cable transmission, system inter-connection, voltage support, reactive compensation, stabilisation of systems; parallel operation of DC links with AC systems; comparison between alternatives for ...

It can be said that, with respect to reliability, the dc transmission system studied for Churchill Falls offers the same degree of reliability as the 735 kV ac transmission system. All analog studies whether ac or dc assume, of course, that the equipment conforms to certain performance specifications. From the ...

The fast development of power electronics based on new and powerful semiconductor devices has led to innovative technologies, such as high voltage dc transmission (HVDC) and flexible ac transmission system (FACTS), which can be applied in transmission and distribution ...

To cope with the changing demands of power transmission, the UHV Transmission Development and Promotion Committee was created in 1973 within the Central Electric Power Council (consisting of the nine Japanese electric power companies and the Electric Power Development ...

The merits of hvdc and uhv ac transmission systems were discussed at an international conference of Electrical Engineers in London, Nov. 1973. Environmental aspects are discussed in relation to increased power-transmission ratings. Within the next decades, power generation will be concentrated in huge ...

This is a collection of papers presented at the 1994 IEEE PES Transmission and Distribution Conference. The topics of the papers include distribution system voltage sags; switchgear; power systems engineering; extruded dielectric distribution cables and accessories; power system harmonics and compensation schemes on ...

This book represents text on HVDC transmission available. It deals with the various aspects of the state of the art in HVDC transmission technology. This book presents many aspects of interactions of AC/DC systems. Modeling and analysis of DC systems are also discussed in detail.

The overhead transmission of relatively large amounts of power over long distances--500 to 2,000 MW per circuit over 300 to 900 miles is discussed. Estimated costs and operating characteristics are given and the state of development of equipment for both ac and dc ehv transmission is reviewed. Comparisons are made ...

Contents: A rated voltage of 1,200 kv for A-C power transmission; Finding the optimum parameters for an EHV line; Calculations on transients in long lines; Operational method for calculations on transients in lines with lumped inhomogeneities, using the d...

The design and testing of a cryogenic bushing for the termination of a 138 kV 3-phase superconducting power transmission line are discussed. Three combined voltage and current bushings have been tested. Vacuum leaks and refrigerator capacity have limited ...

The status of attempts and techniques to reduce audible noise and corona generation and losses in EHV AC overhead power transmission lines in general is reviewed. A number of other promising concepts are identified. The correspondence between available au...

A wide range of power system expansion planning techniques require a very large number of solutions for the real power flows in the line for a given transmission network. The use of complete A-C load flow techniques for solving the exact nonlinear equatio...

In order to find exactly the permitted difference limits of phase, frequency and magnitude of voltage between both power systems in cases where a separated power system was reparalleled to a trunk transmission line, fundamental experiments were carried ou...

A method is developed for calculating the induced voltages on fence wires/pipelines underneath AC power transmission lines. The method is based on the charge simulation technique and takes into account the disturbances of the electric field and potential due to the presence of the fence wire/pipeline underneath the line. The calculated ...

A device is disclosed for connecting a tuned power transmission line to an ac network includes the following units that are serially interconnected in any combination: a phase transposition unit for phase shifting the voltage through an angle which is a multiple of the natural shift of voltages of opposite phases; a coupling ...

of DC and AC transmission to enable development of 10 GW of wind power in western Texas. And TransCanada

The purpose of the study reported here was to examine generic cost differences between direct current (dc) and alternating current (ac) systems and to identify situations in which dc is clearly advantageous for long distance and bulk power transport. The ...

The phenomena of induced AC on pipelines sharing common rights-of-way with overhead high-voltage electrical transmission power lines is discussed. Basic concepts and techniques for personnel safety and some pipeline protective measures are reviewed.

This article describes the use of thyristor-based controllers for more efficient and reliable power line performance. The topics of the article include the flexible ac transmission system, linking power systems, limiting parameters for power flow, the static var compensator, the subsynchronous ...

Gas transmission pipelines often share a common corridor with electric power transmission lines. Magnetic-field coupling from the power line can induce ac voltage between the pipeline steel and the earth. With induced ac voltage on the pipeline, conditions that influence ...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in determining dc ...

Economic considerations of long distance extra high voltage ac and dc transmission are discussed. Voltages above 500 kV ac are briefly considered. The conclusion reached is that the design layouts performed with due consideration of the progress to be expected in the development of high voltage engineering show the application of dc to ...

Projects with large offshore wind farms (up to 500 MW) are in progress. Connecting the parks to the power grid with conventional AC transmission technique is difficult due to non-controllable power flow and voltage stability problems. A new concept for connecting remotely located wind farms is suggested and ...

In a study conducted by the General Electric Company for EPRI, the power modulation of a high-voltage direct-current (HVDC) system for stabilization of an ac/dc network was investigated. The use of both active and reactive power modulation (as opposed to ...

A ground fault detection and shutoff system for underwater power transmission provides protection to divers from swimming into electric fields. This system uses DC power to monitor the true resistance of the load system rather than the AC power to the loa...

The results of a study of proposed lunar base architectures to identify issues concerning centralized and decentralized power system deployment options are presented. The power system consists of the energy producing system (power plant), the power conditioning components used to convert the generated ...

Development of techniques and analytical tools for utilizing the inherent controllability of multiterminal hvdc transmission to enhance the performance of an integrated ac/dc power system were explored. Specific investigations that were performed during the course of the project were described, including steady state operation of ...

Cleveland Electric Illuminating Co. and Ohio State University present (1) a model of the system involving parallel pipelines and power transmission lines and (2) equations to accurately predict the expected induced voltages on pipelines. Case histories of tests include evaluations of variables influencing induction.

An overview is presented of some of the areas to be considered in the design and implementation of transmission cables for an Ocean Thermal Energy Conversion (OTEC) power plant. These considerations include choice of ac or dc cable system, voltage level, environmental problems, and selection of insulation. (LCL)

The project proposes construction of additions to BPA's electric transmission system including transmission lines, substations, and related structures; maintenance of existing facilities including repair of equipment, structures, aerial conductors, and ac...

Progress in a program for evaluating underground dc transmission systems is reported. A representation of a futuristic development of a large ac power system was used for a basic load flow model. This model will be adjusted to produce three representation...

The electrical effects of power transmission lines and the effects that such lines may have on man and his environment are described. The electric effects include corona discharges, electric and magnetic field effects of ac lines, and induced currents and...

The case for dc versus ac power transmission is reviewed. It is concluded that for long transmission distances, i.e. more than 800 km (500 miles), dc transmission is cheaper and probably more reliable. The 1.0-MV Pacific Intertie is cited as an example of a modem efficient dc system.

Eleven papers prepared for presentation at a symposium to be held during 1982 in the USA on scientific cooperation between the US and USSR in the field of research, design and operation of ehv/uhv ac and dc power transmission systems are included. A separ...

Eleven papers prepared for presentation at a symposium to be held during 1982 in the USA on scientific cooperation between the US and USSR in the field of research, design and operation of ehv/uhv ac and dc power transmission systems are included. A separate abstract was prepared for each paper. (LCL)

Advantages of dc over ac for submarine cable links more than counter balance the economic factors involved by the need for suitable terminal equipment. When the power transmitted exceeds a certain limit, dc is the only practicable solution. The advantages of dc transmission are more strongly emphasized for insulated cables than for ...

It is well known that power system transient stability can be improved by utilizing the effects of the power flow in a dc transmission link in a parallel ac--dc power system. The literature describes various control schemes that have been used for this purpose. In a recent experimental study it ...

ehv dc has come into prominence in recent years as a possible economical means of bulk power transmission. Present systems, such as the proposed Pacific Northwest Southwest Intertie, consist of two converter terminals interconnected by a dc transmission line. The source terminal rectifies power from the ...

Three power-system options are considered with respect to utilization on a lunar base: the fully centralized option, the fully decentralized option, and a hybrid comprising features of the first two options. Power source, power conditioning, and power transmission are considered separately, and ...

HVDC transmission is increasingly used as a supplement to AC transmission. In order to exploit the versatility of HVDC transmission, the demand for and the quality of performance of telecommunication systems becomes more important. To properly apply a telecommunication system, the HVDC system characteristics and ...

A value-based automated transmission system planning model is presented in this paper and the impact of the various network representations on the results of the model is discussed. Value-based integrated resource planning provides a ``societal cost`` (utility operation and investment costs plus customer outage costs) minimizing composite ...

Consultants from three engineering firms discussed problems associated with the transmission of power at higher and higher voltages. They predicted a rapid increase in application of both ac and dc ehv transmission, radical departures in design of circuit breakers, faster relaying, and development of new insulation ...

Modulation of power transmitted over a proposed multiterminal dc system to provide effective stability enhancement of a large ac system in the Southwestern U.S. is demonstrated in this paper. This proposed multiterminal dc system connecting the Phoenix, Mead and Los Angeles areas could be in parallel with an Extra High-Voltage (EHV) ac ...

... these are often due to emissions from electrical power transmission lines. Similar narrow-band electrical noise spikes can occur also in laboratory data reduction due to AC power influences. In comparing t...

A contactless decentralized power supply is proposed with communication capability through only one transformer. A prototype of wireless transmission system of power and information (WTPI system) was built, and the two-axis position controls of servo motors were achieved by transferring the power and signal through ...

The operation of a phase controlled static converter, whether acting as a rectifier or inverter, draws reactive power from the ac system and injects into it harmonic currents. The design of filters is discussed, and expense is given special consideration. The following subjects are also dealt with: harmonic curents, filtering performance, reactive ...

The identification of hardware developments and system applications which exemplify cost and operational advantages of integrated ac/dc power systems is discussed. The three principal tasks undertaken were: assessment of equipment developments; quantification of operational advantages; and interaction with system planners. The dissemination of information ...

This working group report presents dc benchmark models tailored to ac/dc interaction. This is to encourage comparisons of the performance of different control strategies or computational tools related to various ac/dc interaction phenomena and system dynamic performance. System data and results are available on diskette or through e-mail.

The possibility of abnormal harmonic generation in an ac system feeding a converter load is examined from the standpoint of automatic control systems used in modern hvdc transmission systems. It is shown that with certain types of automatic controls, the firing angles of converter valves may sustain some errors, which in turn could generate abnormal ...

This text on DC power transmission includes information on the development and use of DC systems, operation of equipment such as converters and capacitors in transmission circuits, the stability of DC systems and the influence of such systems on the stability of associated AC systems, and methods for increasing the ...

The existing experience in building AC transmission models for investigation of transient processes indicates that such models, when the usual 50 cps frequency is used, are extremely bulky and expensive structures. This becomes apparent in particular in a...

.................................................................................................................. 16 6.5 Locating faults on underground cables, paralleled cable circuitsIEEE Std C37.114TM-2004 C37.114TM IEEE Guide for Determining Fault Location on AC Transmission-2004 IEEE Guide for Determining Fault Location on AC ...

The following topics were discussed from the papers: 750 to 1500 kV ac transmission, electric field, overvoltage and lightning protection, air gaps and overhead line insulation, overhead line design, ice and wind loads, and conductors. (DLC)

The following topics were discussed from the papers: 750 to 1500 kV ac transmission, electric field, overvoltage and lightning protection, air gaps and overhead line insulation, overhead line design, ice and wind loads, and conductors. (ERA citation 11:01...

The Alternator Test Unit (ATU) in the Lunar Power System Facility (LPSF) located at the NASA Glenn Research Center (GRC) in Cleveland, OH was modified to simulate high voltage transmission capability. The testbed simulated a 1 km transmission cable length from the ATU to the LPSF using resistors and inductors installed between the ...

The results are presented of a program whose purpose was to investigate new concepts of power transmission structures, considering all electrical and mechanical parameters, in order to minimize their effect on the environment. Information is included on: new structural concepts for power transmission towers; tower ...

The use of compressed gas-insulated equipment in the high voltage transmission network has steadily increased over the recent years. Substations utilizing compressed gas insulation can be placed and used to bring power into urban areas at the full transmission line voltage. Compressed gas-insulated cables have found an increasingly ...

This paper discusses results of an EPRI contract on control design for an ac/dc transmission system to increase power transfers limited by dynamic stability. The control is achieved by modulating the rectifier dc current or power and the inverter dc voltage. Coordinated active and reactive ...

The present invention is for a compact superconducting power transmission cable operating at distribution level voltages. The superconducting cable is a conductor with a number of tapes assembled into a subconductor. These conductors are then mounted co-planarly in an elongated dielectric to produce a 3-phase cable. The arrangement increases the magnetic ...

This paper briefly reviews the main design and operating characteristics of the new voltage and reactive power automatic control system set up by ENEL (Italian Electricity Board) for its extrahigh ac power transmission system. A discussion is also made of...

Increasing complexity of high-voltage direct current (HVDC) transmission systems places new demands on alternating current/direct current (ac/dc) power converters. The possibility of using advanced power conversion techniques, specifically force-commutate...

This paper summarizes the results of a study conducted by the US Department of Energy, Office of Energy Storage and Distribution, to determine generic cost differences between dc and ac systems, and to identify situations where dc is clearly advantageous for long distance and bulk power transport. Data are presented which can aid in determining dc ...

Sep 3, 2010 ... SUBTOPIC TITLE: Power Management and Storage. PROPOSAL TITLE: Efficient Lightweight AC-AC Power Control for Solar UAV ...

To consider the characteristics of SMES and to investigate problems on the operations of SMES in power systems, we carried out some experiments on an experimental network. In the network, a small superconducting magnet is connected to a small synchronous generator through a double thyristorized converter and transformers. The generator is connected to the regional ...

This dissertation first develops an efficient solution technique for solving the steady-state electrical conditions of an integrated ac-dc power system based on the observation that the equivalent loads representing the dc network are independent of the ac load-flow solution. The absence of iterations back and forth between ...

A mathematical model is developed to investigate the dynamic stability dc system in parallel with an ac transmission system. The dynamic stability model for a one machine infinite bus system is developed first. This model is used to determine the dynamic stability of the parallel ac - dc power system under ...

This is the first of two scoping studies of the Flexible ac Transmission System (FACTS). It investigates the possibility of using high speed thyristor based control of HVAC power system elements to enhance the carrying capacity of existing transmission circuits without compromising reliability. A study system ...

... Title : WIRELESS POWER TRANSMISSION. ... Abstract : A popularized article on the transmission of power by wireless means is presented. ...

... OF SUBMARINE POWER TRANSMISSIONS This report is the summary of the evaluation of transmission systems for steam- powered submarines. ...

This study evaluated the technical and economic suitability of many of the underground power transmission systems that may be available in the 1990's. The systems considered included cellulose-, polyproplyene-, and gas-insulated cables, oil-filled cables and cryogenic cables for 345 kV to 765 kV ac or dc systems and ...

The article discusses the possibilities of changing electrical DC-energy obtained in MHD (magnetohydrodynamic) generators with Hall, Montardy and Faraday connection systems into tri-phase AC energy. It presents diagrams of inverters built from thyristors ...

In the opinion of EPRI and ERDA this 46 month program to develop an ac super-conducting power transmission line was unsuccessful in meeting most of its specific objectives. The technical and economic problems pursued are outlined. Unforeseen difficulties ...

Thirteen papers were presented at the meeting. A separate abstract was prepared for each paper. (LCL)

and Demand Database, 2005, http://www.nerc.com/~esd/Brochure.pdf Notes: 1 Circuit miles of AC lines 230 kV and above. 2 Data includes both existing and planned transmission lines...

one pole of a bipole) that acts without power control, not unlike a swing bus in an AC system. - 2 - To combat the possibility for DC over-current in the VSC converter that is...

The development of a suitable polymeric tape for use as insulation on ac superconducting cables is a challenging engineering problem for the designer of plastic films. No commercially available tape simultaneously fulfills all of the electrical, mechanica...

This report strives to define the various environmental effects associated with HVDC lines, discusses the current knowledge of their potential effects on biological and non-biological systems, and compares these effects associated with ac lines where appropriate.

The characteristics and economics of superconducting power transmission cables are described. At present Austria is the only European country continuing this research. The USSR has an active program and U.S. efforts are concentrated at the Brookhaven Laboratory which is constructing a 100 m long 138 kV test facility.

Ultra-low frequency AC field was employed to align p/n polymers during organic photovoltaic device fabrication. The resulting devices show 15% increase in power conversion efficiency and four-fold increase in parallel resistance. Supported by the transmission electron microscopy and atomic force microscopy images, the performance ...

The high capital cost of dc terminal equipment has in the main confined the use of dc to applications where transmission distances are long or where submarine cables have to be used. An alternative application was studied in which the output of a large generator would be connected into the secondary transmission system by means of a relatively short dc ...

Research on power delivery alternatives is reported. The first phase of this work was to develop a model of overhead transmission systems in the range of 362 to 1200 kV ac, and +-400 to +-800 kV dc. Such systems included transmission from generation to lo...

The electrical effects of power transmission lines and the effects that such lines may have on man and his environment are described. The electric effects include corona discharges, electric and magnetic field effects of ac lines, and induced currents and voltages from dc lines. Some of the methods used by BPA to reduce or eliminate ...

Pacific Northwest-Southwest intertie, now under construction, is the largest single electrical transmission development ever undertaken in the US, and the largest high voltage direct current system yet conceived. It carries with it new concepts in transmission cable. The basic advantage of dc for high voltage power ...

The authors report single-phase ac loss measurements on 8, 4, and 3-layer, multi-strand, HTS prototype conductors for power transmission lines. They use both calorimetric and electrical techniques. The agreement between the two techniques suggests that the interlayer current distribution in one-meter long conductors are representative ...

UHV dc transmission is receiving increasing attention as a means of bulk power transmission. From this standpoint, enhancement of UHV dc transmission reliability is important. This problem has not been discussed on a wide basis although the reliability of the ac-dc converter and dc line ...

The paper presents an approach for identifying the most effective Flexible AC Transmission System (FACTS) Controllers, locations, types and ratings that increase asset utilization of power systems. The approach is a combined static/dynamic procedure based on the use of a continuation power flow, and optimal ...

This article is a review of a new switching device currently being developed. This device, known as the thyristor controlled series capacitor, promises to provide nearly instantaneous control over the electric transmission and distribution system. It has been installed at Bonneville Power`s Slatt substation, and it is a key element in the Flexible ...

Control of reactive power permits better use of transmission plant and improves the quality of the power supply. Best results are obtained when this control is exercised rapidly by use of static VAr compensators, which have a high rate of response. Three examples highlight the basic features of SVC's in ...

The high-voltage direct-current (HVDC) bipolar research facilities, adapted from existing ac testing facilities at Project UHV, that were constructed to study and to provide future design information for overhead dc transmission lines in the +- 600 to +- 1500-kV range are examined. A description of the new power supply equipment and a ...

with separate dc sources (batteries) to form a multilevel StatCom/BESS for future analysis. In this study, six to the advantages for high power applications, multi-level converters have been introduced to Flexible AC Transmission Systems (FACTS) to enhance power transmission system operation. ...

Superconductors based upon Nb sub 3 Ge have been fabricated by the chemical vapor deposition (CVD) process in long lengths in a configuration suitable for an ac power transmission line. This material exhibits a transition temperature T/sub c/ greater than...

Facilities developed for the electrical and mechanical testing of equipment for EHV AC, EHV DC, and UHV transmission systems and the tests performed in the facilities are described. Hardware for 1200 kV systems have been tested to and in the design of prototype UHV power transmission lines. (LCL)

In this paper we investigate the effectiveness of an alternative design scheme to reduce the AC losses in high temperature superconducting (HTS) power transmission cables made of non-ferromagnetic HTS coated conductors. With this design, the adjacent tapes of each layer of the cable overlap each other up to a certain distance from ...

The electrical systems of the Central American countries are linked by 230 kV ac weak border interconnections forming two separated subsystems. The first one includes Guatemala and El Salvador, and the other one comprises the systems of Honduras, Nicaragua, Costa Rica, and Panama. As a consequence, unrestricted energy exchanges among all countries are not possible. This ...

This 35 million dollar facility will be a vital part of the Pacific Northwest-Southwest Intertie. It will be one of the four terminals in the project, involving ehv direct current transmission of power. After site preparation, construction began July 25 on the Bureau of Reclamations Mead Substation. This is a key dc, ac terminal of the ...