Aalborg Universitet Adjustable Speed Drives
... Some 35 years ago, Power MOSFETs were introduced by International Rectifiers. They made linear power supplies, which used bipolar junction transistors, obsolete and replaced them with switched mode power supplies [91]. Few years later, IGBT was introduced, which had revolutionized the power electron ...
... Some 35 years ago, Power MOSFETs were introduced by International Rectifiers. They made linear power supplies, which used bipolar junction transistors, obsolete and replaced them with switched mode power supplies [91]. Few years later, IGBT was introduced, which had revolutionized the power electron ...
FAN6920MR ™ Technology Integrated Critical-Mode PFC mWSaver and Quasi-Resonant Current-Mode PWM Controller
... This pin is connected to an auxiliary winding of the PWM transformer through a resistor divider for the following purposes: Producing an offset voltage to compensate the threshold voltage of PWM current limit for overpower compensation. The offset is generated in accordance with the input voltage ...
... This pin is connected to an auxiliary winding of the PWM transformer through a resistor divider for the following purposes: Producing an offset voltage to compensate the threshold voltage of PWM current limit for overpower compensation. The offset is generated in accordance with the input voltage ...
Section [26 33 53] [16611]
... paralleling gear, external bypass static switch (EBS), and other such electrical distribution as described in this Section. 3. The UPS and associated equipment shall operate in conjunction with a primary power supply (utility and/or on-site generation) and an output distribution system to provide qu ...
... paralleling gear, external bypass static switch (EBS), and other such electrical distribution as described in this Section. 3. The UPS and associated equipment shall operate in conjunction with a primary power supply (utility and/or on-site generation) and an output distribution system to provide qu ...
introduction-to-the-arduino
... Enter the microcontroller. A microcontroller is basically a small-scale computer with generalized (and programmable) inputs and outputs. The inputs and outputs can be manipulated by and can manipulate the physical world. ...
... Enter the microcontroller. A microcontroller is basically a small-scale computer with generalized (and programmable) inputs and outputs. The inputs and outputs can be manipulated by and can manipulate the physical world. ...
BASIC ELECTRONICS
... The oscilloscope recalls the default factory settings to initialize the instrument to a known state, which eliminates any nasty surprises. If at any time you do not understand what the oscilloscope is displaying, you can repeat this step. The box at the end of this lesson also gives some suggestions ...
... The oscilloscope recalls the default factory settings to initialize the instrument to a known state, which eliminates any nasty surprises. If at any time you do not understand what the oscilloscope is displaying, you can repeat this step. The box at the end of this lesson also gives some suggestions ...
MGE UPS SYSTEMS Guide Specifications
... The UPS shall be repairable by replacing standard subassemblies requiring no adjustments. Communication via a modem with a remote maintenance system shall be possible. ...
... The UPS shall be repairable by replacing standard subassemblies requiring no adjustments. Communication via a modem with a remote maintenance system shall be possible. ...
A New Look at Repolarization Abnormalities and Arrhythmias
... at such slow rates that there is no distinct repolarization waveform (6). At any time, a local region undergoing repolarization would be surrounded by regions whose repolarization processes were at a slightly greater or lesser degree of completion than its own, producing a rather gentle voltage grad ...
... at such slow rates that there is no distinct repolarization waveform (6). At any time, a local region undergoing repolarization would be surrounded by regions whose repolarization processes were at a slightly greater or lesser degree of completion than its own, producing a rather gentle voltage grad ...
Fundamentals of Motors
... R = Resistance (Ohms) Therefore, if the voltage across the motor changes, either amps or ohms has also changed. Electro−Magnetism Magnetism can be produced by applying electricity to a coil of wire. The wire is wrapped around an iron core. When current flows through the wire, Magnetic lines of force ...
... R = Resistance (Ohms) Therefore, if the voltage across the motor changes, either amps or ohms has also changed. Electro−Magnetism Magnetism can be produced by applying electricity to a coil of wire. The wire is wrapped around an iron core. When current flows through the wire, Magnetic lines of force ...
LED THREE-PHASE MULTIFUNCTION METERS
... The numbering goes from 1 to 60; the higher is the selected number the slower is the change of displays. After a few seconds the following page appears, on which it is possible to select the end scale value of the analogue bar of the Active Power (Act Ratio). The indicated example shows a value of 9 ...
... The numbering goes from 1 to 60; the higher is the selected number the slower is the change of displays. After a few seconds the following page appears, on which it is possible to select the end scale value of the analogue bar of the Active Power (Act Ratio). The indicated example shows a value of 9 ...
DSM3 for XM3 Technical Manual - Alpha XM3
... Images contained in this manual are for illustrative purposes only. These images may not match your installation. Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If there are questions regarding the safe operation of this powering system, pl ...
... Images contained in this manual are for illustrative purposes only. These images may not match your installation. Operator is cautioned to review the drawings and illustrations contained in this manual before proceeding. If there are questions regarding the safe operation of this powering system, pl ...
“Remedial Action Scheme” Definition Development
... 1. Schemes that prevent high line voltage by automatically switching the affected line This scheme is now addressed by exceptions “e” (protection from high voltage) and “i” (automatic de‐ energization of a line when one end is open) in the proposed definition. 2. Protection schemes that operate lo ...
... 1. Schemes that prevent high line voltage by automatically switching the affected line This scheme is now addressed by exceptions “e” (protection from high voltage) and “i” (automatic de‐ energization of a line when one end is open) in the proposed definition. 2. Protection schemes that operate lo ...
Fujitsu Components Engineering Reference Relays
... • Flux-free type: In this model, the gaps between terminals and body of case are sealed by adhesive and the distance from bottom to the level where cover and case fit is large enough not to allow flux to penetrate into the interior along terminals by the effect of capillary phenomenon. However, the ...
... • Flux-free type: In this model, the gaps between terminals and body of case are sealed by adhesive and the distance from bottom to the level where cover and case fit is large enough not to allow flux to penetrate into the interior along terminals by the effect of capillary phenomenon. However, the ...
Catalog information - Kriz
... Capacitors are intended to be operated at or below their rated voltage. All capacitors are designed with a continuous overvoltage capability of 110% of rated voltage and meet IEEE Std 18™-2002 standard. This overvoltage capability is to allow the capacitor to withstand bank and system contingencies ...
... Capacitors are intended to be operated at or below their rated voltage. All capacitors are designed with a continuous overvoltage capability of 110% of rated voltage and meet IEEE Std 18™-2002 standard. This overvoltage capability is to allow the capacitor to withstand bank and system contingencies ...
VS-VSKD600 Series
... liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantabilit ...
... liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantabilit ...
Model D - Marley Engineered Products
... All products manufactured by Marley Engineered Products are warranted against defects in workmanship and materials for one year from date of installation, except heating elements which are warranted against defects in workmanship and materials for ten years from date of installation. This warranty d ...
... All products manufactured by Marley Engineered Products are warranted against defects in workmanship and materials for one year from date of installation, except heating elements which are warranted against defects in workmanship and materials for ten years from date of installation. This warranty d ...
MICHIGAN ELECTRIC UTILITY Generator Interconnection Procedures December 2012 Category 2
... designed to allow for a reasonably expeditious interconnection to the Utility electric system that is both safe and reliable. This document has been filed with the Michigan Public Service Commission (MPSC) and complies with rules established for the interconnection of parallel generation to the Util ...
... designed to allow for a reasonably expeditious interconnection to the Utility electric system that is both safe and reliable. This document has been filed with the Michigan Public Service Commission (MPSC) and complies with rules established for the interconnection of parallel generation to the Util ...
Functions
... the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, ...
... the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, ...
table of contents - 2016 IEEE – ECCE Conference
... A Review of Electronic Inductor Technique for Power Factor Correction in Three-Phase Adjustable Speed Drives Pooya Davari, Yongheng Yang, Firuz Zare and Frede Blaabjerg The Power-Loss Analysis and Efficiency Maximization of A Silicon-Carbide MOSFET Based Threephase 10kW Bi-directional EV Charger Usi ...
... A Review of Electronic Inductor Technique for Power Factor Correction in Three-Phase Adjustable Speed Drives Pooya Davari, Yongheng Yang, Firuz Zare and Frede Blaabjerg The Power-Loss Analysis and Efficiency Maximization of A Silicon-Carbide MOSFET Based Threephase 10kW Bi-directional EV Charger Usi ...
Static Electricity Elimination Equipment
... elimination cartridge is approximately 50% less than that of the high speed static electricity elimination cartridge. The static electricity elimination speed is reduced by approximately 20 to 30%. ...
... elimination cartridge is approximately 50% less than that of the high speed static electricity elimination cartridge. The static electricity elimination speed is reduced by approximately 20 to 30%. ...
SUNNY BOY 3000-US / 3800-US / 4000-US - Installation
... The PV modules used must be suitable for use with the Sunny Boy and must be approved by the module manufacturer. Do not connect any energy sources other than PV modules to the Sunny Boy. The corresponding plant design may require the use of protective devices (see National Electrical Code® 690.9). F ...
... The PV modules used must be suitable for use with the Sunny Boy and must be approved by the module manufacturer. Do not connect any energy sources other than PV modules to the Sunny Boy. The corresponding plant design may require the use of protective devices (see National Electrical Code® 690.9). F ...
Power engineering
Power engineering, also called power systems engineering, is a subfield of energy engineering that deals with the generation, transmission, distribution and utilization of electric power and the electrical devices connected to such systems including generators, motors and transformers. Although much of the field is concerned with the problems of three-phase AC power – the standard for large-scale power transmission and distribution across the modern world – a significant fraction of the field is concerned with the conversion between AC and DC power and the development of specialized power systems such as those used in aircraft or for electric railway networks. It was a subfield of electrical engineering before the emergence of energy engineering.Electricity became a subject of scientific interest in the late 17th century with the work of William Gilbert. Over the next two centuries a number of important discoveries were made including the incandescent light bulb and the voltaic pile. Probably the greatest discovery with respect to power engineering came from Michael Faraday who in 1831 discovered that a change in magnetic flux induces an electromotive force in a loop of wire—a principle known as electromagnetic induction that helps explain how generators and transformers work.In 1881 two electricians built the world's first power station at Godalming in England. The station employed two waterwheels to produce an alternating current that was used to supply seven Siemens arc lamps at 250 volts and thirty-four incandescent lamps at 40 volts. However supply was intermittent and in 1882 Thomas Edison and his company, The Edison Electric Light Company, developed the first steam-powered electric power station on Pearl Street in New York City. The Pearl Street Station consisted of several generators and initially powered around 3,000 lamps for 59 customers. The power station used direct current and operated at a single voltage. Since the direct current power could not be easily transformed to the higher voltages necessary to minimise power loss during transmission, the possible distance between the generators and load was limited to around half-a-mile (800 m).That same year in London Lucien Gaulard and John Dixon Gibbs demonstrated the first transformer suitable for use in a real power system. The practical value of Gaulard and Gibbs' transformer was demonstrated in 1884 at Turin where the transformer was used to light up forty kilometres (25 miles) of railway from a single alternating current generator. Despite the success of the system, the pair made some fundamental mistakes. Perhaps the most serious was connecting the primaries of the transformers in series so that switching one lamp on or off would affect other lamps further down the line. Following the demonstration George Westinghouse, an American entrepreneur, imported a number of the transformers along with a Siemens generator and set his engineers to experimenting with them in the hopes of improving them for use in a commercial power system.One of Westinghouse's engineers, William Stanley, recognised the problem with connecting transformers in series as opposed to parallel and also realised that making the iron core of a transformer a fully enclosed loop would improve the voltage regulation of the secondary winding. Using this knowledge he built a much improved alternating current power system at Great Barrington, Massachusetts in 1886. In 1885 the Italian physicist and electrical engineer Galileo Ferraris demonstrated an induction motor and in 1887 and 1888 the Serbian-American engineer Nikola Tesla filed a range of patents related to power systems including one for a practical two-phase induction motor which Westinghouse licensed for his AC system.By 1890 the power industry had flourished and power companies had built thousands of power systems (both direct and alternating current) in the United States and Europe – these networks were effectively dedicated to providing electric lighting. During this time a fierce rivalry in the US known as the ""War of Currents"" emerged between Edison and Westinghouse over which form of transmission (direct or alternating current) was superior. In 1891, Westinghouse installed the first major power system that was designed to drive an electric motor and not just provide electric lighting. The installation powered a 100 horsepower (75 kW) synchronous motor at Telluride, Colorado with the motor being started by a Tesla induction motor. On the other side of the Atlantic, Oskar von Miller built a 20 kV 176 km three-phase transmission line from Lauffen am Neckar to Frankfurt am Main for the Electrical Engineering Exhibition in Frankfurt. In 1895, after a protracted decision-making process, the Adams No. 1 generating station at Niagara Falls began transmitting three-phase alternating current power to Buffalo at 11 kV. Following completion of the Niagara Falls project, new power systems increasingly chose alternating current as opposed to direct current for electrical transmission.Although the 1880s and 1890s were seminal decades in the field, developments in power engineering continued throughout the 20th and 21st century. In 1936 the first commercial high-voltage direct current (HVDC) line using mercury-arc valves was built between Schenectady and Mechanicville, New York. HVDC had previously been achieved by installing direct current generators in series (a system known as the Thury system) although this suffered from serious reliability issues. In 1957 Siemens demonstrated the first solid-state rectifier (solid-state rectifiers are now the standard for HVDC systems) however it was not until the early 1970s that this technology was used in commercial power systems. In 1959 Westinghouse demonstrated the first circuit breaker that used SF6 as the interrupting medium. SF6 is a far superior dielectric to air and, in recent times, its use has been extended to produce far more compact switching equipment (known as switchgear) and transformers. Many important developments also came from extending innovations in the ICT field to the power engineering field. For example, the development of computers meant load flow studies could be run more efficiently allowing for much better planning of power systems. Advances in information technology and telecommunication also allowed for much better remote control of the power system's switchgear and generators.