...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 ...

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...

...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...

... including major roads and railways (locations of power lines were unavailable ... USLE P Factor (USLEP) 1 No contour plowing is expected (EPA 2004 ...

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 line wherein the motor and power...

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...

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 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 ...

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

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 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. ...

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 ...

and rail make the railway a good transportation manner for heavy weights of goods and personal transportation. Railway is a low energy consumer and the environmental influences are lower compared with buses and cars that run on bio-fuel [14]. The increase of railway transportation is resulting in an increase

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 ...

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 evaluated.

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.

...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...

A fixed site monitoring station recorded the potential gradient disturbances near to two high voltage power lines during 2008. The full year's results show that the electrical environment downwind of power lines is modified compared to that upwind. Potential gradient disturbance was greater on days when there was ...

Emergency response management and rescue operations concerning the railway network in Germany need special attention and implementation in several ways. The emergency response concerning the German national railway network managed by Deutsche Bahn AG is subject to various rules and regulations which have to be followed precisely. Only by following these ...

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.

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...

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...

...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 §...

A circuit is described coupling an RF carrier signal into a signal utilization circuit from an AC power line supplying an electric discharge lamp circuit including ballast means for limiting the current through the lamp. It comprises: an inductive device having a high current capacity winding coupled to the power ...

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 ...

... USARSOCOM I Provost Marshal, HQ CONARC I Provost Marshal, each US ... acLivities, such as railway, waterway, air, or border patrols (see figure ...

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 ac-enhanced corrosion ...

The metric of prime interest in power line epidemiological studies has been AC magnetic intensity. To consider also possible geomagnetic involvement, the orientation of a long straight power line is examined relative to a uniform geomagnetic field (GMF) with dip angle {alpha}. An expression is ...

The Symposium on Railroad Electromagnetic Compatibility (May 14-15, 1980) consisted of five technical sessions on electric traction power distribution systems, locomotive and other propulsion systems, communication and power lines paralleling the right-of...

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 resonance damper, the thyristor-controlled ...

An emerging market for low-cost integrated circuits, that can be used to reduce the energy demands of buildings, is anticipated. To meet these needs, new IC products are now becoming available. These fall into two general catagories: special functions for this marketplace and lowpower versions of standard IC's to ease the power supply problems for remote installations. Both a new PLC ...

High-voltage electrical injury has been well documented in a number of situations, such as the occupational hazard of linesmen and construction workers, and in the context of overhead railway power lines. Two cases of hang-glider pilots contacting 11,000-volt power lines have recently been ...

To manipulate or monitor the operation of cranes and hoists, control engineers typically create control schemes that add numerous conductors, festoon systems, bulky dedicated conductor rails, radio and infrared controls. With modern power line communication equipment, power and intelligence can be combined to: add an unlimited number of control circuits ...

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 a clean sinusoidal current at zero power factor. The second is ...

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 switc...

The power factor controller (PFC) is a solid state electronic device that reduces excessive energy waste in ac induction motors. The significance of the PFC lies in the fact that nearly a billion induction motors are used daily. The PFC is applicable to both single phase and three phase induction motors. Since it is connected to the power ...

A new multilevel voltage-source inverter with a separate dc sources is proposed for high-voltage, high-power applications, such as flexible ac transmission systems (FACTS) including static var generation (SVG), power line conditioning, series compensation...

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 generators directly to utility ...

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, control problems and substantial telecommunications interference may result, requiring appropriate control measures and shielded ...

The design of a superconducting magnetic energy storage coil is presented. The purpose of this coil is to stabilize low frequency power oscillations in long high voltage ac power lines. The practical application for this specific coil will be the installation in the Pacific intertie between Washington State and Los Angeles, California. ...

...reminded of the other standards and requirements cross referenced in § 15.505, such as a limit on emissions conducted onto the AC power lines. [67 FR 34856, May 16, 2002, as amended at 68 FR 19751, Apr. 22, 2003; 70 FR 6776, Feb. 9,...

This book examines the major constraints facing the electricity supply industry when planning new lines and the differing ways in which they affect the choice of a route. Objective matters such as urban development, airfield safeguarding, radio station protection, roads, railways, rivers, canals, and other existing and proposed developments are discussed and the particular ...

A method is described for the determination of ground conductivity as a continuous function of depth and frequency for applications along spatially linear structures such as railway tracks. The technique involves measurements of mutual resistance using a modified dipole array excited with AC currents up to audio frequency. After representation of the ...

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4 6-1 Underground structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4 8-1 Underground structures. Railroad. Design of railroad bridges will be in ac- cordance ...