BOILER

Boiler:-

Boiler is used in Steam Power Plants are of two types

1.Fire Tube Boiler :

Use restricted to low cost,small size and low pressure about 10kg/cm^ plants

2.Water Tube Boilers :

A Boiler may be a straight or bent tube,single or multi drum,horizontal or vertical or inclined tube,longitudinal or cross drum

Boiler

Research and development during last 50 years has led to large Steam Generating capacity Boilers having improved design and construction.Today Boilers are more efficient,compact and lighter in weight in comparison to Old time Boilers.

Boilers can burn low grade fuels.Super critical pressure Boilers with pressure as high as 350 Atm,temperature 600 degree centigrade and capacity 1,00,000 kg/hr are available now.

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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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