• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
MGETM GalaxyTM 5000
MGETM GalaxyTM 5000

... MGETM GalaxyTM 5000 20 - 120 kVA ...
PVI 23TL PVI 28TL INSTALLATION AND OPERATION MANUAL
PVI 23TL PVI 28TL INSTALLATION AND OPERATION MANUAL

C21 Dimming System - Installation
C21 Dimming System - Installation

... a slider) for each channel. On most current control systems, channels are numbers accessed by a numeric keypad. Each channel can control multiple dimmers. A connection device and wiring for powering a lighting fixture from a dimmer. ...
- Magnum Dimensions
- Magnum Dimensions

... The MS-PE Series inverter/charger may only be used in life support devices and systems with the express written approval of Magnum Energy. Failure of this inverter can reasonably be expected to cause failure of that life support device or system, or to affect the safety or effectiveness of that devi ...
PowerPoint 演示文稿
PowerPoint 演示文稿

... operation of main machinery, these too may require a supply from the emergency generator. Jimei university ...
ATTENUATION MEASUREMENT
ATTENUATION MEASUREMENT

... Satellite systems quite often operate with cooled front ends at the receiver because the signals to be picked up are extremely weak. Therefore the front ends often operate with noise temperatures of 5 K. An additional loss of 0.1 dB from an uncooled waveguide would raise the noise temperature to 7 K ...
Impact of Gate-Length Biasing on Threshold-Voltage Selection
Impact of Gate-Length Biasing on Threshold-Voltage Selection

ULTRA 100 Series Drives Installation Manual
ULTRA 100 Series Drives Installation Manual

Wiring Manual | 2011
Wiring Manual | 2011

... different types of switchgear suitable for every kind of application. With its compact dimensions and SF 6 -free design, SVS and Xiria are also the ideal solution for underground applications on infrastructure projects. ...
Undulator Controls
Undulator Controls

... The control and monitoring equipment for each segment will reside in a 19” rack located beneath each undulator girder. Three separate units will be housed in that rack – the Motor Power/AC interlock chassis, the Undulator Control Module, and the Undulator Control Module Interface chassis. ...
1395 Digital DC Drive
1395 Digital DC Drive

... Hazardous voltages may exist in the cabinet even with the circuit breaker in the off position. Recommended practice is to disconnect and lock out control equipment from power sources, and discharge stored energy in capacitors, if present. If it is necessary to work in the vicinity of energized equip ...
AIM101
AIM101

... Describe a transformer’s input and output power relationship and explain its importance Describe how to calculate the current load of a transformer Describe the function of two basic categories of transformers Describe the function of a control transformer Describe the function of a tap on the secon ...
70B-ROP-2002-Recommended Practice for Electrical
70B-ROP-2002-Recommended Practice for Electrical

... and often including, the major items of utilization equipment. They should show all electrical equipment in the power system and give all pertinent ratings. In making this type of diagram, it is basic that voltage, frequency, phase, and normal operating position should be included. No less important ...
SABS STANDARDS DIVISION Amendment No. 8
SABS STANDARDS DIVISION Amendment No. 8

... Part 2: Medium-voltage installations above 1 kV a.c. not exceeding 22 kV a.c. and up to and including 3 000 kW installed capacity. Table 4.2 contains a list of the applicable standards for the components that may be installed in an electrical installation. In the fourth edition of SANS 10142 (SANS 1 ...
For Bodine`s Handbook on small motors, gearmotors
For Bodine`s Handbook on small motors, gearmotors

... The windings in an electric motor consist of many turns of copper wires. Although copper is an excellent conductor, the substantial total length of wire required in the windings results in measurable power loss because the resistance of a wire increases with its length. This I2R loss in the motor is ...
Operating And Service Instructions - AT30 Charger
Operating And Service Instructions - AT30 Charger

SIMODRIVE 611 Drive Converter
SIMODRIVE 611 Drive Converter

... Control modules for 1FK6 and 1FT6 motors with resolver and analog setpoint interface for feed drives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control modules for 1PH induction motors with analog setpoint interface for main spindle drives . . . . . . . . . . . . . . . . . . . . . ...
gesis ELECTRONIC - Wieland Electric
gesis ELECTRONIC - Wieland Electric

... internal bus contact automatically when the modules are combined. In-between feed-in modules allow separate fuses for different functions. Because of the flat shape, the connection from one side, well-thought-out mounting options and the modular concept of this system fits in almost any space. The s ...
Reviewer 2 - Propeller`s Journal
Reviewer 2 - Propeller`s Journal

... 46. The following is a device that transfers electrical energy from one circuit to another by electromagnetic induction. It is a ___________. a. Transformer b. Battery c. Generator d. Rectifier Ans. A 47. The part of a transformer whose function is to deliver the load received is called the _______ ...
EN_Wiring manual
EN_Wiring manual

Electronics 123
Electronics 123

... Shop1 Moulton Centre, Cnr. of Codonia & Moulton Street, Waverley, Pretoria, South Africa PO Box 31113 Waverley Pretoria 0135, Tel: (012) 332 2356, Fax: (012) 332 0487 E-mail: [email protected], Internet: http://www.electronics123.co.za Dear Electronics Enthusiast ...
LTM4601/LTM4601-1 - 12A DC/DC uModules with PLL, Output Tracking and Margining
LTM4601/LTM4601-1 - 12A DC/DC uModules with PLL, Output Tracking and Margining

... The LTM®4601 is a complete 12A step-down switch mode DC/DC power supply with onboard switching controller, MOSFETs, inductor and all support components. The µModule® regulator is housed in small surface mount 15mm × 15mm × 2.82mm LGA and 15mm × 15mm × 3.42mm BGA packages. Operating over an input vol ...
Alstom LGPG111 Service Manual
Alstom LGPG111 Service Manual

Design Considerations For Logic Products
Design Considerations For Logic Products

Advanced Energy® AE 500 Inverter
Advanced Energy® AE 500 Inverter

... Read this entire manual and all other publications pertaining to the work to be performed before you install, operate, or maintain this equipment. Practice all plant and product safety instructions and precautions. Failure to follow instructions can cause personal injury and/or property damage. If t ...
< 1 2 3 4 5 6 7 8 ... 1128 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report