1.

Write a short note on power frequency variations

Answer»

Power frequency variations are a deviation from the NOMINAL supply frequency. The supply frequency is a function of the rotational speed of the generators used to produce the electrical energy.

 

*   At any INSTANT, the frequency depends on the balance between the load and the CAPACITY of the available generation.

 
*  A frequency variation occurs if a generator becomes un-synchronous with the power system, causing an inconsistency that is manifested in the form of a variation.

 

*  The specified frequency variation should be within the limits +- 2.5% Hz at all times for GRID network.




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