DIELECTRIC AND INDUCTANCE

Dielectric:

The word dielectric means nothing but insulator.It means that a dielectric material is something which do not allow the flow of current through it.

Dielectric Strength:

It is defined as the limit of filed strength i.e the property of an insulator that can withstand or oppose the flow of current without breakdown.The breakdown field of an insulator is 10,000 .

That means above this limit of breakdown field the insulator starts conducting the current and behaves as a conducting material.

Inductance:

It is a property of a conductor in which,as the current flowing through it is being changed continuously there will be change in its EMF.The inductance of a material is denoted by letter L and is measured in Henry

These inductance is of two types :

1.Self inductance:

It is the ratio of change of emf of a circuit to the change of current in the same circuit.

2.Mutual inductance:

It is the ratio of change of emf of a circuit to the change of current in a neighbouring circuit.

Note:Hope you got some clarity i will be back tomorrow with some basic law's of EEE-THANK U

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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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