By Jerry C. Whitaker
Right operation of delicate apparatus calls for recognition to temporary disturbances, grounding practices, and standby energy wishes. This moment version of the winning AC strength platforms instruction manual makes a speciality of engineering know-how necessary to the layout, upkeep, and operation of alternating present strength supplies.What's New within the moment Edition?Expanded dialogue on power-system componentsNew bankruptcy on grounding practicesAppendix masking engineering info and tablesUpdated fabric in all chaptersServing engineering group of workers inquisitive about the specification, set up, and upkeep of digital gear for undefined, this revision comprehensively examines the layout and upkeep of ac strength structures for critical-use functions. AC energy structures instruction manual additionally displays the elevated circulation towards microelectronic gear and microprocessor-based structures in addition to the elevated precedence between electronics engineers at the defense of such platforms.
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Additional resources for AC Power Systems Handbook, Second Edition (Design, installation & operation of electronic systems)
The emf induced in a stator winding completes one period for every pair of north and south poles sweeping by; thus, each revolution of the rotor corresponds to two periods of the stator emf. If the machine is to operate at 60 Hz, then the rotor needs to rotate at 1800 rpm. In general, a p-pole machine operating at 60 Hz has a rotor speed of 3600/(p/2) rpm. That is, the lower the number of poles, the higher the rotor speed must be. In practice, the number of poles is dictated by the mechanical system (the prime mover) that drives the rotor.
When the stator windings are connected to an external (electrical) system to form a closed circuit, the steady-state currents in the windings are also periodic. This revolving field arises from the space displacements of the windings and the phase differences of their currents. The combined magnetic field has two poles and rotates at the same speed and direction as the rotor. It is important to observe that the armature circuits are in fact exposed to two rotating fields, one of which (the armature field) is caused by and tends to counter the effect of the other (the rotor field).
One of these two components is stationary (the stator), and the other is a rotational part (the rotor) driven by an external torque. Conceptually, it is immaterial which of the two components is intended to rotate because, in either case, the armature circuits always experience a varying magnetic field. 25 Simplified diagram of a three-phase ac generator. for ac generators, the field windings are mounted on the rotor and the armature windings on the stator. Today, most electric power is produced by synchronous generators that rotate at a constant speed (the synchronous speed).