The report contains the technical specifications for the All-Union state Standard 689-69 high voltage AC disconnects.

... 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 ...

AC/DC voltage standards based entirely on solid-state references used as secondary, working, or transfer standards is widespread, although metrological performance is typically defined only via comparison with a higher level standard. The present report shows the improvements of the output ...

This standard is applicable to coaxial high voltage connectors on nuclear instruments for dc applications up to 5000 volts and ac applications up to 3500 volts rms at 60 Hz. The connectors may also be used at higher frequencies provided the operating voltage is appropriately reduced.

capacitance dividers, current transformers, DC resistance, DC voltage, high-frequency voltage, inductive dividers, LF AC voltage, LF capacitance, LF inductance, LF power/...

The Bureau of Radiological Health has developed a true-RMS line voltage monitor for use by Food and Drug Administration personnel in determining compliance with the performance standard for diagnostic x-ray equipment. The instrument measures ac voltage wi...

The document describes the procedures used at NIST to calibrate dc voltage standards in terms of the NIST volt. Three calibration services are offered by the Electricity Division: Regular Calibration Service (RCS) of client standard cells at NIST; the Volt Transfer Program (VTP) a process to determine the difference between the NIST ...

... OF A TYPICAL ELECTROMECHANICAL AC VOLTAGE REGULATOR AND POSSIBLE ... Descriptors : *VOLTAGE REGULATORS, DESIGN, TESTS. ...

This paper reviews the present state of modern Josephson voltage standards. The presentation focuses on conventional dc standards based on underdamped superconductor-insulator-superconductor junctions and programmable standards based on overdamped superconductor-insulator-normal conductor-insulator-superconductor ...

... 555 PRECISION DC VOLTAGE STANDARD 559 400-CYCLE OSCILLATOR 560 AC - DC CONVERTER 565 TRUCK, HAND, AUTONAVIGATOR ...

Experimental equipment and measurement procedures are described which are used in developing a primary voltage standard based on the ac Johnson effect in order to link the national voltage unit to the universal constant 2 e/h. Use was made of niobium point Josephson junctions producing a ...

An oscilloscope is connected to a sine ac supply voltage as shown above. By clicking in the graph window, you can read the voltage values.

This investigation is concerned with using an a-c polarizing voltage on a standard RC/l ionization chamber in an effort to achieve a simple, self- monitoring and fail safe instrumentation scheme primarily for shut down channels. (W.L.H.)

The Bureau of Radiological Health has developed a line voltage monitor for use by Food and Drug Administration personnel in determining compliance with the performance standard for diagnostic x-ray equipment. The instrument can be used to measure line vol...

The simple theory of the ac Josephson effect in a tunnel junction is presented and recent work on the development and implementation of a national voltage standard based on measurements of the fundamental physical constant 2e/h is reviewed. The principle ...

Very accurate alternating voltage measurement system is described. The system is based on a current comparator bridge and two standard capacitors. These capacitors are connected to input and output of a capacitive driver, and the ratio of currents through...

This paper describes the development of a new technological process for manufacturing MEMS with out-of-plane motion in order to develop voltage references with high stability (deviation from the nominal value less than some 10-6per year) and working in alternating current (AC). In this application, the AC voltage ...

An automatic calibration system used in the calibration of all precision ac calibrators is described. The system includes an ac-dc Transfer Standard, a dc Voltage Standard, and a high resolution digital multimeter, with an IBM-XT Personal Computer for data acquisition and analysis. Specialized ...

The Bureau of Radiological Health has developed a true-RMS line voltage monitor for use by Food and Drug Administration personnel in determining compliance with the performance standard for diagnostic x-ray equipment. The instrument measures ac voltage with less than +-0.1% error over a wide range of ...

Experimental equipment and measurement procedures are described which are used in developing a primary voltage standard based on the ac Johnson effect in order to link the national voltage unit to the universal constant 2 e/h. Use was made of niobium poin...

We have performed a variety of precision measurements by comparing ac and dc waveforms generated by two independent ac programmable Josephson voltage standard (ACPJVS) systems. The objective of these experiments was to demonstrate the effectiveness of using a sampling digital voltmeter to measure small differences ...

We have performed a variety of precision measurements by comparing ac and dc waveforms generated by two independent ac programmable Josephson voltage standard (ACPJVS) systems. The objective of these experiments was to demonstrate the effectiveness of using a sampling digital voltmeter to measure small differences ...

This paper deals with a new theoretical approach using micro- and nano-electromechanical systems to build alternating current (ac) voltage standards. The principle is based on the quadratic variation of the capacitance due to the displacement of at least one of the micro-machined electrodes as a result of an applied electrostatic ...

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 the load, the excess ...

Significant advances in modern ac/ac power converter technologies and demands of industries have reached beyond standard ac/ac power converters with voltage-source inverters fed from diode rectifiers. Power electronics converters have been matured to stages toward compact realization, increased high-power handling ...

The paper summarizes the results of clean-fog tests conducted by eleven task force laboratories on a common suspension insulator, IEEE insulator. The test series done according to a specific set of guidelines, show considerable dispersion in the fifty per cent flashover voltage between the laboratories. The significant parameters of the clean-fog method that influence the ...

leg regulates the voltages on their capacitors independently of the others. Main Features #12;AC/DC/AC C: value of the DC-link capacitors Voltage Oscillation Amplitude #12;AC/DC/AC Converters: TwoAC/DC/AC Converters: Two-Level and Multilevel VSI Page 1 Socrates � Erasmus Visit ...

Apparatus for conditioning power generated by an energy source includes an inverter for converting a DC input voltage from the energy source to a square wave AC output voltage, and a converter for converting the AC output voltage from the inverter to a sine wave AC output ...

A semiautomatic ac/dc difference calibration system is described. The system operates overa frequency range of 20 Hz to 100 kHz, covering the voltage range from 0.5 V to 1 kV. For all voltages at frequencies in the range from 20 Hz to 20 kHz, the total uncertainty is 50 parts per million (ppm), and 100 ppm for ...

A simple, effective technique for stabilizing the optical output of direct-current (dc) arc lamps is described. The large output fluctuation due to arc wander in a commercially available lamp and power supply is minimized by the introduction of an alternating-current (ac) waveform superimposed on the dc-source voltage in conjunction with detector ...

AC and DC resonant charging hardware tests were conducted with a 15KW DOD standard 400 HZ generator as prime power. DC resonant charging caused vibrations of the generator at the pulsing frequency and instability of the voltage regulator due to the very i...

Contents: Welcome; Division Programs; Electricity Highlights; The Electronic Kilogram; Voltage Metrology; Metrology of the Ohm; Single Electron Tunneling; AC-DC Difference Standards and Measurement Techniques; Farad and Impedance Metrology; Pulse Metrolog...

Experiments utilizing the ac Josephson effect already provide a precise means of monitoring the stability of some of the nationally maintained standards of voltage. The advantages to be gained from operating most components of such a system at cryogenic t...

A concept for a colloid engine with an electrodynamic linear accelerator is described. The charged particle source is a standard colloid engine with an extractor voltage that has an AC componen.t Downstream of the extractor, a series of accelerator gates ...

A concept for a colloid engine with an electrodynamic linear accelerator is described. The charged particle source is a standard colloid engine with an extractor voltage that has an AC component Downstream of the extractor, a series of accelerator gates a...

Over the last 15 years, research in ac Josephson voltage metrology has focused on two fundamentally different systems: the programmable and the pulse-driven Josephson voltage standards (JVSs). This paper reports the first high precision comparison between the two types of JVS. The METAS programmable ...

The development of voltmeters to meet the need for rms voltage measurements in the infrasonic frequency range and the need to trace these measurements to the U.S. legal unit of voltage are discussed. A new method for supporting voltage measurements in the 0.1Hz -10 Hz range is described. The principles of the method are embodied in ...

This paper analyzes the interactions between the ac voltages and the dc current in weak ac/dc interconnections. The response of the voltage is expressed in terms of the basic parameters of the interconnection and the impact of these parameters on the voltage waveshapes is analyzed. Finally, ...

This patent describes a dimmer for fluorescent lights that utilizes the standard ballast associated with the lights, comprising: means for controlling the transmission of the normal line A.C. voltage sine wave to the ballast. This is done so that the A.C. voltage is connected to the ballast ...

A voltage controlled oscillator which drives a switching circuit for dc-to-ac conversion of dc power is presented. The dc-to-ac converter operates into a ferroresonant voltage stabilizer which limits the amplitude of ac voltage that is then rectified and ...

The patent application relates to a device for measuring the AC voltage fluctuation and, more particularly, to a high accuracy, high resolution, fast response field device which stores and displays the sag and surge voltage values of an AC source for X-ra...

In a particle accelerator of the type employing ac primary power and a voltage multiplication apparatus to achieve the required high dc accelerating voltage, a filament supply circuit is powered by a portion of the ac primary power appearing at the last stage of the voltage multiplier. ...

. However, reducing the CMV via PWM pulse pattern typically degrades the other modular performance supply AC-DC-AC power converter units. Pulse Width Modulation (PWM) is the standard approach to operate controlling the PWM pulse patterns is the most economical method as it requires no extra components and cost

This paper designs a switching power with high power factor, which has the standard input 220V AC, and the adjustably output voltage range form DC 30V to 36V, the maximum output current can be to 3A. It designs the main circuit, the PFC control circuit, the measurement circuit, and also calculates the important parameters of these ...

Partial Contents: High-Voltage Vacuum Circuit Breaker 'MULTI-VCB'; Recent High-Voltage AC Load-Break Switches with Fuses; High-Modularity TWIN BREAKER Series; Static Protective Relays; Present State and Tendency of Standard Distribution Apparatus; Intelli...

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

The report contains general technical specifications for high voltage AC breakers as listed in GOST 687-70.

This new version of the CCK adds capacitors, inductors and AC voltage sources to your toolbox! Now you can graph the current and voltage as a function of time.

Terry L.M. Bartelt of the Wisconsin Online Resource Center has created this object learning activity on AC voltage conversions. This is a nice introduction for those interested in this basic topic.

High current low voltage dc to ac conversion - hall effect, superconducting switch, & efficiency

A Novel Voltage Equalization Charger Using Capacitors, Diodes, and an AC Power Source for Energy Storage Cells

The SP Josephson array voltage standard has since 1993 been used to realize the Swedish unit of DC voltage. The report describes the voltage standard and how the Josephson voltage is used to determine the voltage of primary voltage ...

... Title : PARASITIC VOLTAGES INDUCED BY ARTIFICIAL FLAWS WHEN MEASURED USING THE AC FIELD TECHNIQUE. Corporate Author : ...

... Each capacitor is charged to approximately the peak of the AC input voltage. The top capacitor in the DC bus is charged ...

The electrohydrodynamic (EHD) spraying technique has been utilized in applications such as inkjet printing and mass spectrometry technologies. In this paper, the role of electrical potential signals in jetting and on the oscillation of the meniscus is evaluated. The jetting and the meniscus oscillation behavior are experimentally investigated under ac ...

... high and at low voltages as well ... DIELECTRIC PROPERTIES, DIELECTRICS, VOLTAGE REGULATORS, VOLTAGE, POLARIZATION, CAPACITORS ...

New standards for ac current and voltage measurements, thin-film multifunction thermal converters (MJTCS), have been fabricated using thin-film and micro-electro-mechanical systems (MEMS) technology. Improved sensitivity and accuracy over single-junction thermoelements and targeted performance will allow new measurement approaches in ...

An energy saving dc-dc converter circuit is disclosed having two energy efficient means which operate in tandem, an energy conserving means and a voltage doubling means. These energy efficient means are applied in combination with elements commonly found in dc-dc converter circuits, namely an ac voltage generator, a transformer for ...

... Accession Number : AD0607612. Title : THE CALCULATION OF HIGHER HARMONICS OF PERIODICALLY SWITCHED AC VOLTAGES,. ...

Several embodiments for determining the state of charge of a cell or battery are disclosed. In accordance with one method of this invention, an ac voltage is applied to a cell or battery through a shunt. The phase angle between the ac voltage across the battery terminals and the ac current ...

Power dissipation is ac induction motor is reduced by circuit that lowers applied voltage when motor

The international key comparison APMP.EM-K9 of AC-DC high voltage transfer standards with 12 participants was carried out from June 2000 to January 2004. This comparison offers the same range and frequencies as BIPM key comparison CCEM-K9, voltages at 500 V and 1000 V, frequency from 1 kHz to 100 kHz. This ...

Describes the action of a capacitor when dc is applied and when ac is applied. Describes and illustrates the phase relationship between voltage and current in a capacitor when ac is applied. Compares the voltage and current relationship in an inductive an...

The program describes the action of a capacitor when DC is applied and when AC is applied. It describes and illustrates the phase relationship between voltage and current in a capacitor when AC is applied. It also compares the voltage and current relation...

The development, construction, and testing of a test transformer for ultrahigh ac voltages are described. Such transformers - as a three-stage cascade suited for the generation of ac voltages of up to 2400 kV - are indispensable, for instance, the testing...

capacitor bear both the ac and _VC (t) CEB Vg Vin *1 _ capacitor bearing both ac and dc components of capacitor voltage (b). the dc component of the voltage capacitor voltage and peak inductor and switch currents of the series resonant converter depend strongly

This paper describes the development of ac and dc interface specifications and array voltage trade-off studies leading to a conceptual design of a central station rated (1-10 MW) photovoltaic power conversion system (PCS). The ac interface specifications are based on utility practices and standards, modified by the ...

This paper is aimed at investigating the characteristics of a sliding discharge (SD) including the onset voltage (Vo), spark voltage (VS), and current-voltage (I-V) relationship in a multi-rod reactor stressed by sinusoidal AC or pulse voltage. The effects of various parameters (the ...

An uninterruptible power supply is described, said power supply comprising: AC input terminal means for receiving a first AC voltage from an AC power source; DC input terminal means for receiving a first DC voltage from a DC power source; AC output terminal means for ...

This article predicts that as the relatively low cost, reliability and flexibility of solid state starters become recognized, they will replace conventional devices for starting ac motors under reduced voltage conditions. It explains that reduced voltage starters are used to reduce motor starting current, and to limit starting torque ...

of the capacitor voltages will be chosen to maximizethe numberof ac voltage levels obtainable. A. Assessment oj disturbance of the ac voltages, but a large change in the capacitor voltagc balancing situation. If redundant outputs by use of ac-side transformers [4,5]. The ...

Apparatus and method for transmitting dc power to a load circuit by applying a dc voltage from a standard waveform synthesizer to duration modulate a bipolar rectangular wave generator. As the amplitude of the dc voltage increases, the widths of the rectangular wave generator output pulses increase, and as the amplitude of the dc ...

In order to establish a quantum ac voltage standard at NMIJ/AIST, we have developed a Josephson arbitrary waveform synthesizer based on overdamped Josephson junction arrays (JJAs) using optoelectronics and a liquid helium free compact cryocooler. We have succeeded in the generation of sine waves at 60 Hz and 152.6 kHz. To verify the ...

Case study in engineering ethics with a numerical component. Could be used in a course on antenna theory or design or an upper division design course in electrical engineering. The case starts with: "Electrical energy involves power generation, transmission, and distribution. The latter two involve DC or AC lines with varying voltages. The largest known DC ...

When an unbalanced fault occurs in the ac line in the ac-dc link system, the ac voltage and current of the converters become unbalanced. If the unbalance of the converter ac voltage is large, the dc current is interrupted or does not flow. If the unbalance of the ...

High-voltage high-vacuum arrangements may emit x-ray radiation; the radiated power is substantially affected by the voltage level. There is a trend towards higher operating voltages in the case of vacuum switching devices. Hence the author reports on meas...

A modular, low weight impedance dropping power supply with battery backup is disclosed that can be connected to a high voltage AC source and provide electrical power at a lower voltage. The design can be scaled over a wide range of input voltages and over a wide range of output voltages and ...

The development of voltmeters to meet the need for rms voltage measurements in the infrasonic frequency range is discussed as well as the need to trace these measurements to the U.S. legal unit of voltage. A new method for supporting voltage measurements ...

The behavior of a semiconductor contact is usually represented by the specific contact resistance determined by a dc measurement. A copper-gold contact on p-type cadmium telluride is used to illustrate the influence of the ac contact impedance on standard semiconductor measurements such as capacitance versus voltage, admittance ...

This patent describes an internal combustion engine electrical system comprising: an A.C. generator driven by an internal combustion engine; a rectifier circuit for rectifying A.C. output generated by the A.C. generator; a constant voltage power circuit which outputs a substantially constant D.C. ...

A waveform synthesizer adopting a superconductor-normal metal-superconductor junction array has been developed, which can generate arbitrary stepwise waveforms with a number of quantum-voltage steps up to 1 V level amplitude. As an application of the synthesizer, we have built a sampling voltmeter that measures the differential voltages between a ...

This paper presents an inductorless cascaded H- bridge multilevel boost inverter for EV and HEV applications. Currently available power inverter systems for HEVs use a DC- DC boost converter to boost the battery voltage for a traditional 3-phase inverter. The present HEV traction drive inverters have low power density, are expensive, and have low efficiency because they need a ...

A system is presented to aid in correcting a low power factor to increase a plant's AC capacity. This is also an aid to reducing ''penalty'' charges, improving voltage supply, and lowering power loss in feeders, transformers, and distribution equipment. A worksheet is provided which shows how to determine power ...

-based capacitors used earlier [6]. This change eliminated problems seen earlier, including a large ac signal out and Future Challenges for the NIST Charged-Capacitor Experiment Neil M. Zimmerman, Jonathan L. Cobb, and Alan to charge a cryogenic standard capacitor and measure the voltage that develops. In this paper, we summarize

as the ac voltage was increased, but it increased linearly with ... of quenching was found to be independent of ac frequency from 0.2 kHz to 1 kHz. Spec- ...

... The four technical architectures are: Medium Volt AC Power Generation (MVAC), High Frequency AC Power Generation (HFAC), Medium Voltage ...

Build circuits with capacitors, inductors, resistors and AC or DC voltage sources, and inspect them using lab instruments such as voltmeters and ammeters.

... Title : A TRANSISTORIZED DC-AC INVERTER. ... Abstract : The termopribor design bureau has developed the PN-025 transistorized voltage inverter. ...

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 ...

A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch to control current flow and terminal ...

This applet simulates the behavior of a simple RLC circuit with an AC voltage source. The user can change the period of the voltage source, the inductance, and the capacitance of the circuit. The applet then graphs the voltage of the voltage source and the voltages across ...

Aug 6, 2004 ... transmitted onaconductor, an HVDC system can carry 1.4 times that voltage on the same wire since an ac system's effective voltage is only ...

... minutes after turning on the power supply voltages ... In addition, problems with stray pickup become ... an appreciable AC ripple voltage with respect to ...

It is the intent of this paper to develop a method to model the single phase voltage controlled rectifiers which will be attached to the AC power grid as an ...

The Voltage Rating shall be the maximum direct current (dc) or alternating current (ac) root mean square (rms) voltage for which a fuse is designed. ...

... to use ac voltages to operate the light valve. ... light activated voltage gate for the ... Descriptors : *LIQUID CRYSTALS, *VALVES, *SCREENS(DISPLAYS ...

... A number of architectures have been reported and discussed, including AC systems, DC systems, constant-voltage systems, constant-current ...

... Abstract : If the presently installed three-phase ac transmission system on aircraft were replaced by a higher voltage dc (HVDC) transmission using ...

... 3: It is assumed that on present 208/115-volt ac systems the number of load circuits limited by voltage drop isr negligible. ...

The use of a thin film or a planar multijunction thermal converter (PMJTC) for the ac-dc transfer of voltage and current is well established. In general, a three dimensional multijunction thermal converter (MJTC) has the advantage of accuracy and a single junction thermal converter (SJTC) has that of low cost. PMJTCs provide a long-term stability, a high ...

The past 35 years have seen the development of an unexpected plethora of quantum electrical standards based on just two fundamental constants, e and h. First came a voltage standard based on the Josephson a.c. effect, in terms of which most maintained primary standards of ...

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 ...

A single-chip integrated LED particularly adapted for direct use with a high voltage DC or AC power sources comprises a plurality of electrically isolated LEDs on a generally transparent substrate and bonded to electrically conductive elements on a therma...

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.

Shows the elements of an ac series circuit. Demonstrates, by sine waves and circuits, the effects upon and phase relationships between current and voltage. Using a lcr circuit, examines the effects of voltage and shows what the generator sees when xl exce...

This learning object, created by Terry L.M. Bartelt and John Rosz of Wisconsin Online Resource Center, focuses on AC voltage conversion problems. Aside from just the presentation, this site also contains practice problems. Overall, this is a useful presentation for a brief introduction on this topic.

A variable frequency inverter is described for driving an ac induction motor which varies the frequency and voltage to the motor windings in response to varying torque requirements for the motor so that the applied voltage amplitude and frequency are of o...

The stabilization characteristics of liftoff and blowoff in nonpremixed laminar jet flames in a coflow have been investigated experimentally for propane fuel by applying AC and DC electric fields to the fuel nozzle with a single-electrode configuration. The liftoff and blowoff velocities have been measured by varying the applied voltage and frequency of ...

This paper describes breakdown characteristics of an oil-pressboard insulation system to a superposition voltage of AC and DC voltages. Although AC electric field is decided by the ratio of the relative permittivity of a pressboard and insulating oil, DC electric field is decided by ratio ? of volume resistivities. ...

This paper reports on a local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the working and reference electrode is maintained by driving an ...

This paper discusses electrical insulation characteristics of high temperature superconducting (HTS) cables for their reliable and rational insulation design. We focused on a severe and practical operational condition of HTS cables, i.e. under commercial ac / lightning impulse superimposed voltage. Experimental results for a HTS cable insulation model ...

This paper presents some studies of ac voltage behavior of the poloidal field power supply system for JT-60 using computer simulations. The system consists of a motor-generator (MG), several thyristor convertors, two sets of dc circuit breakers and some other devices. Two analyses are made with respect to the behavior of the system. The one is concerned ...

... The primary advantage of the method lies in the fact that a non ... Because of this, the ac impedance depends on frequency but not on the dc voltage ...

... In accordance with one method of this invention ... analog voltage which represents the AC component that is phase shifted by the impedance of the ...

This paper presents a control scheme of matrix converters for reducing the output voltage harmonics. The proposed control scheme is based on the direct AC/AC conversion approach and the carrier-based PWM control to obtain the constant switching frequency. The proposed scheme can realize the simultaneous control of both the output ...

A.3 shows a schematic representation of the circuit usedfor the AC-coupling and zero clamping. The voltage across ...

Other commercial and defense applications include pulse power conditioning for high power electronics and high voltage AC systems. ...

The life cycle cost and the purchase price of simple dc and ac propulsion systems are estimated as a

... DIRECT CURRENT, LOW VOLTAGE, AUTOMOTIVE VEHICLES, SINE WAVES, ELECTRONIC COMMUTATORS, MAGNETIC CIRCUITS. ...

... From the latter, the coil impedance and the ... FIELDS, HALL EFFECT, ELECTRICAL IMPEDANCE, COILS, VOLTAGE, CONDUCTIVITY ...

... rectifying the AC voltage signals generated by the ... and a source impedance 91 represent the ... Disclosed Method" section, of a transmission line ...

Abstract�Piezoelectric transformers (PZT) can be used advantageously in high output voltage dc�dc converters. In such applications the output section includes a voltage doubling rectification scheme to help increase the output voltage. This topology was modeled and analyzed by considering the expected voltage ...

Defines inductance and explains its cause and effect in an ac circuit illustrates inductive reactance, the factors that affect inductive reactance in an ac circuit, and the phase relationship between current and voltages as a result of the presence of ind...

The video defines inductance and explains its cause and effect in an ac circuit. It illustrates inductive reactance, the factors that affect inductive reactance in an ac circuit, and the phase relationship between current and voltages as a result of the p...

...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 lines or contain provisions for...

...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 line, the radio frequency...

The map displays extra-high voltage electric transmission lines (345 kilovolt ac, 500 kilovolt ac, 765 kilovolt ac, +-400 kilovolt dc, and +-250 kilovolt dc capacities) in the 48 contiguous states (plus the District of Columbia). Also shown are major cities, substations, and generatings interconnected with the ...

An annual map shows the location of extra-high voltage electric transmission lines (345 kilovolt ac, 500 kilovolt ac, 765 kilovolt ac, +-400 kilovolt dc, +-250 kilovolt dc capacities) in the 48 contiguous states and the District of Columbia. Major cities, substations, and generating plants interconnected with the ...

An annual map shows the location of extra-high voltage electric transmission lines (345 kilovolt AC, 500 kilovolt AC, 765 kilovolt AC, +- 400 kilovolt DC, +- 250 kilovolt DC capacities) in the 48 contiguous states and the District of Columbia. Major cities, substations, and generating plants interconnected with the ...

The distribution of the Hall voltage induced by low-frequency AC current is studied theoretically in the incoherent linear transport of quantum Hall systems. It is shown that the Hall-voltage distribution makes a crossover from the uniform distribution to a concentrated-near-edges distribution as the frequency is increased or the ...

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage ...

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage ...

We present the Condon domain phase diagram for a silver single crystal measured in magnetic fields up to 28 T and temperatures down to 1.3 K. A standard ac method with a pickup coil system is used at low frequency for measuring the de Haas-van Alphen effect (dHvA). The transition point from the state of homogeneous magnetization to the inhomogeneous Condon ...

A method is described for controlling an electrostatic precipitator which includes discharging electrodes and collecting electrodes and which is supplied with a rectified secondary high voltage from a high voltage generating apparatus switchably connected to an AC source, the method comprising: applying a secondary ...

The National Institute of Standards and Technology (NIST) calibration service for voltage transformers and high-voltage capacitors is described. The service for voltage transformers provides measurements of ratio correction factors and phase angles at pri...

This paper discusses the principles affecting the occurrence of partial discharges (corona) in high voltage dc systems and with transient voltages. The discharge behavior with dc voltages is compared to that with ac. Particular attention is given to the number or quantity of discharges under dc and transient ...

... Extension of the NIST AC-DC Difference ... The NIST primary standards of ac-dc difference for current are multijunction thermal converters (MJTCs). ...

reveal a new phenomenon, namely the generation of an additional dc voltage Vdc , and consequently extra on the Bean model imparts a role only to the ac field in generating the dc voltage. Moreover, it is clear for various values of Iac and a constant level of Idc 20 A. Clearly, the generation of a dc voltage

... Abstract : A mutual inductance bridge for measuring ac magnetic susceptibility at low frequencies, using standard components, is described. ...

A fully automatized alternating current (ac) susceptometer is constructed for simultaneous measurements of the phase resolved complex linear and complex nonlinear ac susceptibilities of lossy and dispersive dielectric materials. This relatively simple setup allows measurements over a wide range of experimental variables, such as ac ...

Adjustable speed AC drives have become the preferred choice in many industrial applications where controlled speed is required. At the same time, the maturing of the technology and the availability of fast and efficient solid state power semiconductor switches (IGBTs) has resulted in voltage source, PWM controlled inverters becoming a ...

This learning object contains an applet on the operation of a transformer. Transformers are used to increase or decrease AC voltages and currents in circuits. The user has the option to vary the input voltage, the primary windings, and the secondary windings to observe different values for the output voltage.

... included a high-level dc voltage measure- ment circuit and a low-level ac circuit. ... High-voltage ceramic capacitors were used in the voltage divider. ...

capacitance dividers, current transformers, DC resistance, DC voltage, high frequency voltage, inductive dividers, LF AC voltage, LF capacitance, LF inductance, LF power/...

at left below) A few capacitors (see above) Procedure 1. Turn on the power supply and set the AC voltageIntroduction In this experiment we will determine how voltages are distributed in capacitor circuits and explore series and parallel combinations of capacitors. The capacitance is a measure

In this report the dynamic over-voltages caused by blocking of one or more HVDC converters feeding into an AC network is analyzed. The voltage regulating capability of the nearby generators is one of the determining factors. The waveform of a typical over...

is the quality factor. When using a voltmeter to measure the rms value of a voltage, the maximum peak voltage the output voltage with the HP3400 true rms voltmeter. Repeat for the other filters. AC Line Corruption Use

The method of switching functions and the method of separate components are used to analyze electromagnetic processes in valve converters. Expressions for current and voltage are obtained for various devices, including pulse-width converters, pulsed ac-voltage converters, controlled rectifiers, and autonomous voltage inverters.

Residential electric circuits are subjected to surge voltages resulting from load switching in buildings, and from external causes such as lightning. Laboratory test data are presented on high voltage breakdown values for armored cable (type AC cable), no...

The carrier behavior in a tetracene thin film under AC electric field was examined by electroluminescence (EL) using the structure of organic field-effect transistors (OFETs). A square wave voltage was applied to the source electrode, whereas the drain and gate electrodes were connected to the ground. Electrons and holes were injected from the Au source ...

A new type absolute temperature-sensor with the measurable temperature range between 77 K and 400 K based on the forward voltage change due to the ambient temperature is proposed and demonstrated. In this temperature-sensor the forward ac voltage change or the forward ac current change at the pn junction diode due ...

Superconductor/normal conductor/superconductor (SNS) Josephson junction series arrays are the subject of research for the realization of a Josephson arbitrary waveform synthesizer (JAWS) based on pulse-driven Josephson junctions. Lumped arrays of SNS Josephson junctions are investigated for this application at the Physikalisch-Technische Bundesanstalt (PTB). The series arrays consisting of ...

The goal of this research and development contract is to develop and prototype for manufacturing a modular, bi-directional power inverter for photovoltaic applications. This modular inverter will be used as building block for larger inverters by connecting in parallel (for higher power) or in series (for higher AC voltage) or both. The modular inverter ...

Flexible AC Transmission Systems (FACTS) have been conceived to increase the transmissibility of electric power without the necessity of building new transmission lines. An important family of controllers proposed for FACTS are based on high power solid-state switches, such as the gate-turn-off thyristor (GTO), which is presently rated at 6kV, 6kA. The FACTS controller ...

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 second high frequency inverter module which ...

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 second high frequency inverter module which ...

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 ...

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 stable RMS voltage levels but the presence ...

The purpose of this work is to evaluate the performance of a specific ac drive topology that is of current interest in industry. With the increasing pressure for compliance with IEEE�519 and other international harmonic standards, many ac drive manufacturing companies are seeking innovative and cost effective solutions for ...

The purpose of this work is to evaluate the performance of a specific ac drive topology that is of current interest in industry. With the increasing pressure for compliance with IEEE-519 and other international harmonic standards, many ac drive manufacturing companies are seeking innovative and cost effective solutions for controlling ...

The cost and feasibility of electric winch drives for underway replenishment highline/spanwire winches is investigated. The winch drives of interest are those using Silicon Controlled Rectifier (SCR) solid state motor controls. Service requirements including performance parameters and reliability/maintainability requirements are identified. Candidate electric drive systems are the dc ...

The optimization and testing of a line-commutated inverter (LCI) for linking photovoltaic arrays to utility ac systems are reported. A parity simulator is used to optimize both the basic LCI circuit and the prototype device at the operating parameters, ac line = 240 V ac, single phase; dc voltage = 200 V; dc ...

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 capabilities are shown to vary from those ...

In order to develop improved standards for the measurement of ac voltages and currents, a new thin-film fabrication technique for the multijunction thermal converter has been developed. The ability of a thermal converter to relate an rms ac voltage or current to a dc value is characterized by a ...

The paper presents statistical time lags measured for breakdown events in near-atmospheric pressure argon and xenon. Ac voltage at 100, 400 and 800 kHz was used to drive the breakdown processes, and the voltage amplitude slope was varied between 10 and 1280 V ms-1. The values obtained for the statistical time lags are roughly between 1 ...

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 values of the ...

Microgrid voltage collapse often happens when there is a high percentage of low inertia air-conditioning (AC) motors in the power systems. The stalling of the AC motors results in Fault Induced Delayed Voltage Recovery (FIDVR). A hybrid load model including typical building loads, AC motor ...

A battery charging circuit is described comprising: a power input for accepting an AC energy source; a power output connected to a battery to be charged and supplying the regulated voltage to the battery; and a rectifier charging circuit for supplying current at the regulated voltage to the power output, and including a regulation ...

Of all the alternative and renewable energy sources, wind power is the fastest growing alternative energy source with a total worldwide capacity of over 93 GW as of the end of 2007. However, making wind energy a sustainable and reliable source of electricity doesn't come without its set of challenges. As the wind turbines increase in size and turbine technology moves towards off-shore wind farms ...

Direct AC/AC converters have been studied due to their potential use in power converters with no DC-link capacitor, which can contribute to the miniaturization of power converters. However, the absence of a DC-link capacitor makes it difficult to control the AC motor during power interruption. First, this paper proposes a system that realizes ...

The analysis and control of temporary overvoltages at the ac busbars of an HVDC converter station has been treated in great detail. Often it has been found necessary to operate circuit breakers to disconnect a major capacitive load from the main ac buses under severe transient overvoltage conditions. This paper describes results of tests made on a ...

This paper describes a single-phase, series-resonant inverter which injects a sinusoidal current into a load while a standard AC utility source is connected to the load and which can be used in photovoltaic applications. At moderate power levels the inverter requires DC input in the kilovolt range but will operate over a wide input ...

This thesis proposes an uninterruptible power supply, UPS for high availability servers with fuel cells as its back up energy source. The system comprises a DC to DC converter designed to accommodate the fuel cell� s wide output voltage range. A server power supply is specified, designed and simulated for use with this UPS. The UPS interfaces internal to the server power ...

Based on the successful completion of the extensive research project DOE/ET/29303-1 February 1982 to develop a new method for the determination of threshold voltage in XLPE and EPR insulated cables, tests were initiated to establish the maximum safe operating voltage stresses of crosslinked polyethylene insulated cables that become wet when they operate in ...

This study examined certain characteristics of spark discharges from vehicles energized by an electric field. Vehicles were placed in an electric field produced by a 500-kV transmission line. Spark discharges were delivered through a resistor to a driven ground rod. Discharge current and voltage were monitored. These data are analyzed to determine capacitance measured under ...

Real-time dynamic measurements are performed on a single cell in a standard commercially available large plasma panel. The measurements determine cell response to variations in address pulses, sustain waveforms, or priming from neighboring cells. The wall-charge measurement indicates the internal dielectric surface charge and the capacitance measurement indicates the existence ...

This patent describes a spark ignition system comprising an ac voltage source and a thermostat to call for heat by passing the ac voltage from the source, a main burner, a main valve responsive to ac voltage for admitting gas fuel to the main burner, a pilot burner, a pilot ...

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 ...

Circuit Construction Kit (DC + AC): This new version of the CCK adds capacitors, inductors and AC voltage sources to your toolbox! Now you can graph the current and voltage as a function of time. Fun, interactive Java simulation of physical phenomena from the Physics Education Technology project at the University ...