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Power Stations

Power Stations. Electrical part of power stations. Generator. Spinning coils of wire within magnetic fields Property of electromagnetism that a changing magnetic field through a loop of wire produces a voltage along the loop

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Power Stations

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  1. Power Stations Electrical part of power stations

  2. Generator • Spinning coils of wire within magnetic fields • Property of electromagnetism that a changing magnetic field through a loop of wire produces a voltage along the loop • This voltage can drive a current and provide energy to an external circuit

  3. The Generator Principle • Loop of wire (conductor) rotates within stationary magnetic field • this produces changing field requirement • Brush contacts connect to rotating loops and carry current to external circuit • In practice, wire makes many (thousands of) loops to get a larger voltage • each loop adds to voltage • Simplest arrangement leads to alternating current (AC)

  4. Synchronousspeed • The relation between speed and frequency is N=120f/P, where f is the frequency in Hz (cycles per second). P is the number of poles (2,4,6...) and N is the rotational speed in revolutions per minute (RPM).

  5. The Transformer Principle • Current through loop produces magnetic field along axis of loop • Alternating current produces changing magnetic field • Magnetic field carried along iron core • Secondary coil sees changing magnetic field and develops alternating voltage • Ratio of voltages is just ratio of turns in the two coils: V2 = (N2/N1) V1 • Allows transmission at high voltage, household at low voltage

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