Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Calculate Generator Mechanical Energy

  1. Aug 2, 2011 #1
    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.
     
  2. jcsd
  3. Aug 2, 2011 #2
    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.
     
  4. Aug 2, 2011 #3
    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Calculate Generator Mechanical Energy
Loading...