Fundamentals of Electricity Generation, Presentation 1

transcript

FUNDAMENTALS OF ELECTRICITY

GENERATION – PRESENTATION 1

4/15/2016

Presentation By: Armstrong Okai Ababio, Electrical Engineer, Electricity Company of Ghana

Michael Faraday’s Law of Electromagnetic Induction-1

In 1831, Michael Faraday, an English physicist gave one of the most basic laws of electromagnetism called Faraday's law of

electromagnetic induction. This law explains the working principle of most of the

electrical motors, generators, electrical transformers and inductors . This

law shows the relationship between electric circuit and magnetic field.

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Michael Faraday’s Law of Electromagnetic Induction-2Faraday performs an experiment with a

magnet and coil. During this experiment, he found how emf is induced in the coil when flux linked with it changes.

In other words, one can say that an emf is induced in a conductor when there is relative motion between the conductor and the magnetic field (lines of force).

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Michael Faraday’s Law of Electromagnetic Induction-3By way of relative motion, we mean either

the conductor should move to cut the magnetic circuit (lines of force) or vice versa.

In principle, the direction of the induced emf or flow of the induced current can be determined by Flemings Right Hand Rule for Generator action.

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Michael Faraday’s Law of Electromagnetic Induction-4The conductors (windings) are usually

housed on the Stator (Stationary part) whiles the Magnetic poles are usually housed on the Rotor (Rotating part).

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Michael Faraday’s Law of Electromagnetic Induction-5Demonstration

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Rotor (Rotating Part)

Stator (Stationary Part)

SNMagnetic Field

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Demonstration

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4/15/2016Presentation By: Armstrong Okai Ababio, Electrical Engineer, Electricity Company of Ghana

Fleming’s Right Hand and Left Hand RuleAn emf is induced in a conductor when there

is relative motion between the conductor and the magnetic field (lines of force).

From first principles, the direction of the induced emf or flow of the induced current can be determined by Fleming’s Right Hand Rule for Generator action.

4/15/2016Presentation By: Armstrong Okai Ababio, Electrical Engineer, Electricity Company of Ghana

Fleming’s Right Hand and Left Hand Rule-2Also from first principles, a current carrying

conductor in a magnetic field will experience a jerk (force).The direction of this jerk (force) can be

determined by Flemings Left Hand Rule for Motor action.

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Fleming’s Right Hand RuleFleming’s Right Hand Rule: This rule states

that if the thumb, fore finger and the central finger of the right hand are kept perpendicular to each other so that the fore finger points in the direction of the field and the thumb in the direction of the motion of the conductor, then the induced current flows in the direction of the central finger.

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Fleming’s Right Hand Rule-2

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Fleming’s Left Hand RuleFor a conducting wire moving through a

magnetic field, a rule stating that if the middle finger, index finger, and thumb of a left hand are extended at right angles to each other, that the middle finger will indicate the direction of the flow of electrons, the index finger the direction of the magnetic field, and the thumb will indicate the direction of the movement of the wire.

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Fleming’s Left Hand Rule-2

4/15/2016 Presentation By: Armstrong Okai Ababio, Electrical Engineer, Electricity Company of Ghana

Lenz LawLenz's law states that the current induced

in a circuit due to a change or a motion in a magnetic field is so directed as to oppose the change in flux and to exert a mechanical force opposing the motion.

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Lenz Law-2

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THANK YOU VERY MUCH FOR YOUR KIND ATTENTION

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Fundamentals of Electricity Generation, Presentation 1

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