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LabVIEW************* System for Power Quality Measurement of
LabVIEW************* System for Power Quality Measurement of

... • Most protection schemes that have been proposed are based on a socalled crowbar.  This paper analyses the behavior of a crowbar-protected DFIG. • It has received considerable attention in the past and some good approximate equations to determine the maximum short-circuit current have been derived ...
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slides from group 2
slides from group 2

< 1 ... 1187 1188 1189 1190 1191 1192 1193 1194 1195 ... 2014 >

Alternating current



Alternating current (AC), is an electric current in which the flow of electric charge periodically reverses direction, whereas in direct current (DC, also dc), the flow of electric charge is only in one direction. The abbreviations AC and DC are often used to mean simply alternating and direct, as when they modify current or voltage.AC is the form in which electric power is delivered to businesses and residences. The usual waveform of alternating current in most electric power circuits is a sine wave. In certain applications, different waveforms are used, such as triangular or square waves. Audio and radio signals carried on electrical wires are also examples of alternating current. These types of alternating current carry information encoded (or modulated) onto the AC signal, such as sound (audio) or images (video).
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