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99068
99068

... B r i e f l y, phase trip corresponds to the actual load current through the conductor while ground trip is the unbalance of the three-phase currents. Ground tripping will trip all three phases below the phase trip minimum trip value since ground tripping can be the result of any unbalance on the sy ...
HVDC links in AC power system
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Tyre Safety by Electromagnetic Field
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... The main consideration in the design of an electromagnet is its lifting power of the magnet [1]. Cast steel was selected for this design because it has a narrow loop area which gives it a high permeability, hence making it suitable for core of electromagnet. The core of the electromagnet is first sp ...
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... Western Union’s telegraph lines to the clocks. The Self Winding Clock Company owned and leased the clocks. They would provide a service through Western Union to customers in need of accurate or synchronized timekeeping and charged appropriate fees for this service. Western Union would take care of m ...
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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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