# PSSE damping constant

Hi! The swing equation PSSE use is given in the program application guiden in
section 14.4.4, equation 14.2. The constant D*e is told to "give an approximate
representation of the damping effect contributed by the speed sensitivity of
system loads" and that D*e "represents the variation of electrical load with
frequency". What do they mean by that and what type of damping are they
approximating? I have read the manual a few times but I cant really understand
what they are meaning with the damping term D_e. Maybe someone have an example
etc. that can explain this better?

Kind regards