By Jerry C. Whitaker
Brief disturbances are what complications are made from. no matter what you name them-spikes, surges, or strength bumps-they can take your apparatus down and go away you with a sophisticated and costly fix activity. defense opposed to temporary disturbances is a technological know-how that calls for cognizance to element. This e-book explains how the ability distribution method works, what can get it wrong with it, and the way to guard your facility opposed to abnormalities. procedure grounding and protecting are lined intimately. each one significant approach to brief security is analyzed and its relative advantages mentioned. The e-book presents a whole examine the serious parts of the AC energy method.
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16. The leakage inductance of both coils has been modeled by an inductor in series with the load, since the current is the coils also produces the leakage flux. These inductances are labeled Lp and Ls, respectively. Notice that the leakage inductance for the secondary side has been divided by the turns ratio n2 because it was reflected to the primary side. Resistors Rp and Rs are placed in series with the load to represent the resistance of the conductors used to wind the coils. Again, the secondary resistance is divided by the square of the turns ratio because it was reflected.
Today, most electric power is produced by synchronous generators that rotate at a constant speed (the synchronous speed). This speed is dictated by the operating frequency of the system and the machine structure. AC generators are also used that do not necessarily rotate at a fixed speed, such as those found in windmills (induction generators); these generators, however, account for only a small percentage of the power generated today. 28, which shows a cross section of a basic ac machine. The rotor consists of a winding wrapped around a steel body.
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). , open-circuited stator windings). This phenomenon is referred to as armature reaction. © 1999 CRC Press LLC It is possible to build a machine with p poles, where p = 4, 6, 8, . . (even numbers).
AC Power Systems Handbook by Jerry C. Whitaker