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June 8, 2013

Mention The major features of a good protective gear for alternator and transformer

Major features of a good protective gear
ΓΌ  High speedy
ΓΌ  Selectivity
ΓΌ  High sensitivity
ΓΌ  Stability
ΓΌ  Simplicity
ΓΌ  Reliability



Write down the Protective System of Alternator and Transformer

Alternator protection
ΓΌ  Differential protection system
ΓΌ  Balanced Earth fault protection
ΓΌ  Stator-inter run protection

Transformer protection
ΓΌ  Using Buchholz relay
ΓΌ  Combined leakage and overload protection
ΓΌ  Circulating-current scheme for transformer protection


Write down some major Faults of Alternator and Transformer.

Major faults in Alternator


  • ΓΌ  Failure of prime-mover
  • ΓΌ  Failure of field
  • ΓΌ  Over Current
  • ΓΌ  Over Voltage
  • ΓΌ  Over Speed
  • ΓΌ  Stator Winding faults
  • ΓΌ  Unbalanced loading


Major faults in Transformer

ΓΌ  Open circuits
ΓΌ  Over heating
ΓΌ  Earth Fault
ΓΌ  Phase-to-Phase fault
ΓΌ  Over Load
ΓΌ  Phase to ground fault
ΓΌ  Incipient fault
ΓΌ  High voltage surge fault

How can a circuit element absorb power?

By converting electrical energy into-


  • Heat (resistors in toasters); 
  • Light (light bulbs); 
  • Acoustic energy (speakers); 
  • Storing energy (charging a battery).

June 2, 2013

EEE Project -1 : 15- Step Digital Power Supply


Its is a simple circuit to obtain variable DC voltage from 1.25V to 15.19V in reasonably small
steps.

Download Instruction:
1. Click on the 'Download Now' button
2. Wait for five seconds and then click on 

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