Calculate Generator Mechanical Energy

[jimmynora]

I have a huge generator 2.5MW and I need to calculate the mechanical energy (kinetic energy) it contains when it is running at rated speed (2975 R/min).

How can I do that and I quantities do I need ?

My goal is to relate how much electric energy the generator produces as depending on its mechanical energy.

 

[edgepflow]

The rotational kinetic energy is:

KE = 1/2 * I * w^2

I = moment of inertia of rotating assembly

w = angular velocity = 2975 rpm

Hopefully, the generator manufacturer can tell you what 'I' is. If not, you will have to estimate.

Check units when calculating result.

 

[I_am_learning]

Generator Mechanical system has something called the H-constant. Its values lies between 5 and 10.
H-constant = Kinetic Energy / Machine MVA
So, in your case, Kinetic Energy = 2.5 * (5 to 10) Mega joules.