...to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies...operation and which do not operate from the AC power ...

...to be connected to the public utility (AC) power line, the radio frequency voltage that is conducted back onto the AC power line on any frequency or frequencies...to be connected to the public utility (AC) power ...

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

The system described provides protection for phase sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc converter fo...

... to supply the reference voltage line if all DC power supplies within the ... on Surprise Package aircraft (A/C 490) and on standard Gunship aircraft (A/C ...

As more dc terminals, in the form of links or multiterminal systems, come into operation, the opportunity for controlling ac line flows using the injected dc powers increases. This paper describes a study undertaken to determine the feasibility of using an on-line method to coordinate the dc injections of a ...

...705 MHz and which do not operate from the AC power lines or contain provisions for operation while connected to the AC power lines. Digital devices that include...provision for the use of, battery eliminators, AC adaptors or battery chargers which...

An alternating current power generation system adopted to inject power in an already powered power line is discussed. The power generating system solves to adjustably coup an induction motor, as a generator, to an ac power ...

...powered, it must comply with the AC line conducted requirements found in § 15.207. AC or DC power lines and data input/output lines connected to the module must not contain ferrites, unless they will be marketed with the module...

Thyristor drives with their nonsinusoidal currents and momentary commutation shorts are becoming more prevalent on ac power systems. The effects of ac power line inductance on line pollution and successful operation of the drive and common drives on the same feeder will be ...

Feedthrough of interference from the AC power line into accelerator components is a problem which in pulsed accelerators can be reduced by operation synchronous with the AC line. This means of avoiding line-frequency effects is ineffective for continuous ...

Concepts of maximum power transfer of dc systems and associated ac voltage variations, particularly at inverter stations having low short-circuit ratios, have been extended to include various ac load models and an ac line in parallel with the dc line. The operating ...

Most power lines relay alternating current (AC) electricity. But more direct current (DC) lines are being constructed since they can channel more power over ...

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 ...

Contents: Summary of recommendations (AC power switches, across-the-line capacitors, flyback transformers, yokes, materials); Comparison of existing and proposed standards (AC power switches, across-the-line capacitors, flyback transformers, yokes); Discu...

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 ...

... line. It is claimed that the above type of synchronous-flux machine can operate economically as a generator or as a motor. ...

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

dc to ac conversion techniques, line-commutated inverters, self-commutated inverters, utility interconnection, and the application of dc to ac conversion to photovoltaic systems are discussed. (WHK)

dc to ac conversion techniques, line-commutated inverters, self-commutated inverters, utility interconnection, and the application of dc to ac conversion to photovoltaic systems are discussed. (ERA citation 04:046081)

Line-commutated inverter (LCI) power conditioning systems are applied in photovoltaics (PV) applications as a dc to ac energy conversion system. The inverter accepts dc power from the photovoltaic array in a manner that is compatible with array design characteristics. The dc power is then ...

A phase protection system is provided for protecting phase-sensitive loads from being or remaining connected to ac power lines whenever a phase reversal occurs. It comprises a solid state phase detection circuit, a dc power relay circuit, an ac-to-dc conv...

... are synchronized to the 60 Hz line frequency and contain some type of back up oscillator to insure continued operation during AC power outages. ...

A system is described for power conditioning a line of supply of AC power from an AC source to an AC load, comprising: a first array of static power switches mounted across one AC source and AC load; a second ...

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 ...

for geared system, pm or synchronous for DD. Generator-side converter converts AC electric power to DC Line-side converter converts DC to system-frequency AC (50 Hz or 60...

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...

A low voltage DC power-supply is described for an electronic circuit load which comprises: at least one battery; means for regulating the voltage delivered from the battery to the load; and means for charging the battery from AC line power source comprising: means for controlling the charging voltage applied to the ...

An AC power-quality survey was conducted at four hospitals of differing bed sizes in the Midwest. This power-line survey concentrated on determining the ac power quality in three areas: ICU/CCU, radiology, and the clinical chemistry lab. A summary of three months of monitoring indicates very ...

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 Gemini Synchronous inverter is a solid state device that, when interposed between a variable-voltage DC power source and an AC power grid, converts the DC to AC at standard line voltages and frequencies. If more power is available from the DC source than is required by ...

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...

Line-Commutated Inverter (LCI) technology provides reliable, efficient and cost-effective DC to AC power conversion for photovoltaic systems. Its only potential shortcoming for large scale use was power quality. In 1980 MIT Lincoln Laboratories and Windworks, Inc. recognized the need for power ...

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 ...

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 ...

A magnetic demagnetizing device consists of a transformer tapping an a-c line connected by an electronic system that effects and regulates a-c power flow to an exit transformer, the secondary of which is coupled to the demagnetizing coil. (D.C.W.)

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.

A system for transmitting low frequency analog signals over AC power lines using FM modulation. A low frequency analog signal to be transmitted is first applied to a voltage-to-frequency converter where it is converted to a signal whose frequency varies in proportion to the analog signal amplitude. This signal is then used to modulate ...

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

... The supplies are designed to operate from a normal 115 volts AC, 60 hertz power line. They incorporate regulating circuitry ... Support Rod S~ Spring ...

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 ...

An electronic circuit is described for precisely controlling the power delivered to a load from an a-c source, and is particularly useful as a welder timer. The power is delivered in uniform pulses, produced by a thyratron, the number of pulses being controlled by a one-shot multivibrator. The starting pulse is synchronized ...

the generator angle and the DC power Pdc under the case 1 fault; and Figs. 6 and 7 show the system dynamic to be Pd dc � 0:4 in order to minimize the change of DC line power and to keep the pre-fault generatorA nonlinear robust HVDC control for a parallel AC/DC power system Hongzhi Cai a , ...

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is accomplished by injecting a high frequency carrier signal onto an AC power line current. The AC ...

A method and apparatus for monitoring an electrical-motor-driven device by injecting a high frequency carrier signal onto the power line current. The method is accomplished by injecting a high frequency carrier signal onto an AC power line current. The AC ...

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 ...

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...

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.

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.

In the framework of the 1000 kV system design project, systematic research on acoustic noise produced by corona on bundled conductors for UHV lines has been conducted. Moreover, experimental investigations on the physiological and psychological aspects of...

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

A photovoltaic power generation system based on immittance conversion theory is described. The name of an AC module stands for an integrated inverter installed on the backside of the PV module panel, and it generates about 100W of ac power. One distinctive feature of the proposed system the modules supply ...

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 ...

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 the role of telecommunication should be understood. As discussed ...

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...

... 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 dc - ac inverter system based on a phase controlled rectifier (PCR) and on a transistorized switching regulator inverter (SRI) was developed for connecting photovoltaic panels with the power grid.

The design and testing of a 400 watt, dual phase, dual rotor, field modulated inductor alternator is described. The system is designed for use as a flywheel to ac utility line or flywheel to dc bus (electric vehicle) power converter. The machine is unique...

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 the rectifiers of Fig. 4 consists of three tank capacitors placed on the ac side of the rectifier and a tank those of Fig. 4 in that they contain three tank inductors placed on the ac side plus a tank capacitor in Fig. 17. Note from Fig. 17 the constraint holds over the entire ac- line period. The simulated ...

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 ac system ...

This invention relates to a power supply system having the capability of furnishing to a load sensitive to electrical faults and interruptions, electrical power for prolonged periods of time after a utility or other external power supply source thereto is interrupted. The system comprises a main A.C. generator ...

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a ...

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a ...

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...

Ontario Hydro shows that pipelines on power-line rights-of-way can play a significant part in the conduction of fault return currents. The voltage hazards near a pipeline are illustrated for power-system faults occurring within power stations and those occurring along the transmission lines. Metal pipelines buried ...

This report provides background information about (1) the electric and magnetic fields (EMFs) of high-voltage transmission lines at typical voltages and line configurations and (2) typical transmission line costs to assist on alternatives in environmental documents. EMF strengths at 0 {+-} 200 ft from centerline were calculated for ...

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 ...

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 overhead ...

The final report concludes that the two most likely long-range candidates for converting dc to ac power from batteries and fuel cells are the basic current-fed line commutated inverter (a derivative of HVDC technology), and the voltage-fed conduction angl...

The voltage waveforms induced on overhead power lines by high altitude EMP are calculated, varying the location and orientation of the power line with respect to the burst, the power line height, the ground conductivity, and the free field EMP amplitude and waveshape. ...

The development of dc-ac inverter circuits which can be used for the connection of solar panels with the power grid is reported. A solar power simulator of 700 W has been developed and two inverters have been examined. The first is a high-efficiency switching regulator inverter (SRI) for feeding the power grid with ...

Presented is a bibliography and survey of ongoing work concerning the biological effects of fields from power lines. Approximately 800 citations are noted, some with abstracts; and about 80 ongoing research efforts are identified. The following areas have been emphasized: (1) AC power-line fields biological effects ...

A load-leveling system for connection to an alternating current network is described. The system comprises an electrochemical direct current energy supply, a line-commutated controllable electronic power convertor having dc terminals connected to the energy supply and ac terminals for connection to the ac network, ...

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 possess economic ...

Data generated by interfacing a single-phase synchronous (line-commutated) inverter to a local utility and to a minigrid which simulated a 25 percent utility penetration are presented. Line-commutated synchronous inverters are used by some wind systems manufacturers for interfacing the direct current or rectified alternating current output of wind-turbine ...

An hvdc transmission system may be more economic than hvac for overhead lines longer than 400 miles or underground or underwater cable longer than 30 miles. Dc line cost is approximately 75% of an ac line having the same total conductor cross section, the same maximum line to ground voltage and ...

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 each architecture ...

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 ...

A thyristor-based inverter/charger for use in electric passenger vehicles is described, and prototype charger test results are presented. A battery charger is included integral to the inverter by using a subset of the inverter power circuit components. The integral charger employs the inverter commutation components as a resonant ac/dc converter rated at ...

Page 1. EFFECT OF AC POWER ON EBW DETONATORS Allan H. Herrbach ... 4. TITLE AND SUBTITLE Effect of AC Power on EBW Detonators 5a. ...

Efficient, light-weight power conditioning equipment was investigated in the area of AC to AC transformation, where AC of a variable frequency is to be transformed efficiently into AC of a fixed frequency at a significant power level. This task, which fol...

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 ...

A report of a trip arranged for a group of senior Canadian business executives and sponsored by the State Committee for the Coordination of Scientific Research, Union of Soviet Socialist Republics is given. Russian plans to construct a 750 kV ac line are briefly mentioned.

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...

Apple. power, Gigabit Ethernet, 2 USB 2.0, audio line in and out, lock slot ... Apple. multi-touch trackpad. Mouse. Apple. Energy Star 100V to 240V AC ...

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...

Studies were made of the harmonic content of the current and voltage at the generator bus of the Tokamak Fusion Test Reactor. Out of numerous load scenarios, one case was considered in detail. The harmonics were found acceptable for the generator; however...

Modern LASL detonators were subjected to three alternating current waveforms to determine the susceptibility of the detonators to high-order detonations when the line voltages supplied by local utility companies are applied across the detonator electrodes...

...marketing of Access BPL equipment must be directed solely to parties eligible to operate the equipment. Eligible parties consist of AC power line public utilities, Access BPL service providers and associates of Access BPL service providers. The responsible...

...Unlicensed Personal Communications Service Devices § 15.315 Conducted limits. An unlicensed PCS device that is designed to be connected to the public utility (AC) power line must meet the limits specified in §...

...Identification. An anomaloscope is an AC-powered device intended to test for anomalies of color vision by displaying mixed spectral lines to be matched by the patient. (b) Classification. Class I (general controls). The device is exempt...

�DC Micro-grid� is a novel power system using dc distribution in order to provide super high quality electric power. The power is distributed through dc distribution line and converted to required ac or dc voltages by converters placed near loads. The load side converters do not need ...

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 ...

It is concluded that the two most likely long-range candidates for converting dc to ac power from batteries and fuel cells are the basic current-fed line commutated inverter (a derivative of HVDC technology), and the voltaged-fed conduction angle controlled force commutated inverter. Results are presented for analyses of cost, ...

monitor and power supply data, such as beam loss during magnet quenches, dump kicker misfires and power Current Xfmr AC Line Monitor Power Supply quench quench dump beamabort dump beamabort Data storage for mortem plots show voltage ripples for many of the supplies, throughout the ring. ...

There is a great interest in power line carrier facilities because of their inherent reliability, and because of an increasing demand for transmission of data for protection, control, and optimization of power system operation. Improved isolation of carrier signals to the desired line section may permit increased ...

In this dissertation, two major accomplishments are achieved. First, the feasibility of a proposed Wyoming to California HVDC system having the ratings of 1000 MW, �500 kV, 2 kA, 860 miles and 12-pulse bipolar lines is shown for exporting Wyoming's electrical power resources to the heavy loaded western states. The second and the main objective of this ...

Two experimental PV systems are constructed and operated. One is a system with a line-commutated inverter and another uses a self-commutated inverter and is operated alone as an independent power source when the power network is in trouble. Operating and generating characteristics have been measured for the ...

...AC-powered magnet. (a) Identification. An AC-powered magnet is an AC-powered device that generates a magnetic field intended to find and remove metallic foreign bodies from eye tissue. (b) Classification. Class...