Numeric or Per Unit Value

may be that should have read Numeric (Per Unit) Value for clarity. If you go through the IEEE 112 it never uses anything except the perunit value.

In the calculations too, we use the conventions- either "0.02 slip" or "2% slip" or "Motor RPM 980"

Induction motors have synchronous speeds that are 120 x Hz/no. poles. For 60 Hz, these speeds are 3600, 1800, 1200, 900,... rpm. For 50 Hz; 3000, 1500, 1000, 750,... rpm.

The actual running speeds in each case are slightly less; for 60 Hz, some typical values would be 3500, 1750, 1165, and 875 rpm, etc.

In absolute (numeric) terms of rpm, the corresponding slips are 100, 50, 35, and 25 rpm, etc. In percentage (per unit) terms, the slips would be 2.78%, 2.78%, 2.92%, and 2.78% respectively.

If a motor rated 1750 rpm at 100% load is only lightly loaded, the slip will be less and the speed higher, say 1770 rpm. If the motor is overloaded, the slip is greater and the speedlower, maybe 1725 rpm. Load, torque, slip, and current are basically proportionate (slight differences on account of decreased speed).

That is a bit simplified, and there are types of motors with quite different characteristics, but this should fit the normal "workhorse" induction motors.

Your help is much appreciated. Translating this kind of technicial specification requires in-depth investigation and good attitude. I hate to be pushed (tight schedule, improper task allocation)while doing this make-or-break kind of translation(once translation is wrong,there might be serious consequence). Anyway,thanks for your help.

I read on and I get this:

The power factor, PF, obtained with Equation (59) is a numeric value, i.e., 0.xx.