Hydro Generator- Part 3

Out-puts from a Generator - Governors

•

• •Governor ensures frequency at a set value by increasing / decreasing the fuel input
  
  Two types of Governors :
  Pneumatic : Fuel flow is controlled by valve position control. Control Input : DC Voltage

          Electronic : Fuel flow is controlled by a total servo mechanism. Control input : DC Voltage pulses 

 

Out-puts from a Generator - Voltage

• •Voltage is induced in the stator winding
•  Terminal voltage depends upon :

1.   No. of conductors in series per winding
2.   Speed at which magnetic field cuts the winding
3.   Strength of the magnetic field
   

 Voltage Control

• •Nominal Voltage = 415 V, 11 kV 
• Voltage can vary due to load fluctuations 
• Terminal voltage is controlled by

varying the Strength of magnetic field

          = varying the current through the field coil
          = varying the voltage applied to the field coil (Exciter control)

 

Typical Exciter

 

Read more in coming posts...