How Do You Convert a Synchronous Generator Inertia From 1.0 tm2 to s?

Solve for s.

Mechanical Dynamics, the Swing Equation, Units 1.0 Preliminaries ...

Generator inertia is a ratio, the kinetic energy divided by the power output and its units are seconds:

J=rotor moment of inertia,

ω = angular speed (radians/sec)

MVA = Power rating of generator

H can apply to a single generator or a bus of paralleled generators.

http://www.iea.lth.se/eks/L5_12.pdf (Sorry, link no longer available.)

Don't know what you're trying to do, but if you divide torque (N.m) by moment of inertia (kg.m²) that gives angular acceleration (rad/s²). Dividing change of speed (rad/s) by that gives acceleration time (s).

is that tm2 unit a terrameter-squared? WTF?

Try dividing the angular momentum by the generator rating, to give the rating in seconds. This has been pointed out by others already, so do it and stop whining, or the cheese tray will be along shortly.

This is a piece of minutiae where power engineers use the words "Inertia Constant" to represent similar but different things, the clue lies in the units. The "true" inertia constant is based on the physical arrangement of the rotating mass, also known as the moment of inertia (WR²) in pound-ft². The "other" is known as the H-constant, which is expressed in terms of the stored energy per kVA.

The relationship is: H=0.231((WR²)(rpm)²)(10∧-6))/kVA kW-sec/kVA

There's also M which is also called the inertia constant which relates M(pu) to H:

M(pu)= H/(180*f) s²/electric degree

If that's not confusing enough, here's some class notes to further confuse clarify the issue.

Why? I liked it better in grade school when things were simple.