LAW'S OF ELECTRO MAGNETIC INDUCTION

Electro magnetic Induction:

The process by which electric current is produced in a circuit due to change in the magnetic field associated with it is known as Electro magnetic Induction.

There are 2 laws of Electro magnetic induction

Electro magnetic induction

Faraday's law
Lenz's law

Faraday 1st law

This law of electro magnetic induction states that when ever the magnetic flux linked with a circuit changes , an induced emf is produced.

Faraday's 2nd law

This law states that the magnitude of induced emf is directly proportional to the time rate of change in magnetic flux linked with the circuit

Lenz's law

This law states that the induced current produced in a circuit due to change in magnetic flux always flows in such a direction that it opposes the cause that produces it.

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GENERATOR

GENERATOR: A Generator is a machine which converts Mechanical energy into Electrical energy.These are widely used inside the Power plants for the generation of Power. Generator In general the Generator we see in a Thermal power plant gains its mechanical energy from the Turbine connected to it and this mechanical energy is thus converted into the required Electrical energy by the Generator.I myself experienced a 15 days of internship in a Thermal power plant and the Generator was about the size of a lager hall both in its length and breadth and the output Electrical energy is thus achieved by the use of a Generator.

SWITCHING TRANSIENTS IN TRANSFORMER

Switching Transients: The word Transients is always very Scary for me but not any more hahaaa...........what about you???? Well coming to the point...why do these Switching Transients occur in a Transformer. When the switch is closed when the voltage is maximum...then the flux required by the core is zero and the available flux in the core is also zero and hence NORMAL OPERATION is sufficient When the switch is closed when the voltage is crossing zero...then the flux required by the core is maximum but here the avaliable flux in the core is zero and hence TRANSIENT OPERATION is required Here when the Transient operation takes place then the flux doubles gradually and this is known as Doubling Effect of Transformer.This Doubling Effect causes magnetic in rush current and Damage in the insulation. Using Secondary Harmonic Restraining Coil can reduce all these Drawbacks.

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