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  1. #1 أنواع دوائر الإثارة في المولدات 
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    Dec 2011
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    الموضوع ده كنت بتلخبط فيه كتير لحد ما لقيت الدليل الشافي فيه

    Self–Excited Generators
    The excitation system of a self–excited generator is powered, via the automatic voltage
    regulator (AVR), by tapping (shunting) power from the generator power output. The
    voltage regulator senses generator output voltage and frequency, compares them to
    reference values and then supplies a regulated DC output to the exciter field windings.
    The exciter field induces an AC output in the exciter rotor, which is on the rotating,
    engine–driven generator shaft. Exciter output is rectified by the rotating diodes, also on
    the generator shaft, to supply DC for the main rotor (generator field). The voltage
    regulator increases or decreases exciter current as it senses changes in output voltage
    and frequency due to changes in load, thus increasing or decreasing the generator field
    strength. Generator output is directly proportional to field strength. Refer to Figure 4–2.
    Typically, a self–excited generator excitation system is the least expensive system
    available from a manufacturer. It provides good service under all operating conditions
    when the generator set is sized properly for the application. The advantage of a
    self–excited system over a separately–excited system is that the self–excited system is
    inherently self protecting under symmetrical short circuit conditions because the field
    “collapses”. Because of this, a main line circuit breaker for protecting the generator and
    the conductors to the first level of distribution may not be considered necessary, further
    reducing the installed cost of the system.
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  2. #2  
    تاريخ التسجيل
    Nov 2012
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