Isochronous Mode and Droop Mode

Check this site here and be thankful someone invented Google

What does this link has to do with my question ?

Dear Mr. A.Kaseem,

The Isochronous Mode and Droop Mode refers to the Speed Governing by the Governor of the Prime Mover like Steam Turbine, Diesel Generator Engine, Steam Engine etc.

When the load increases on the prime mover the speed will slightly fall in relation to the Rated Speed. The rate of fall of speed from No-load to Full load condition is called Droop character. When there is no fall of speed from No-load to Full load condition is called Isochronous condition, which means the Speed Vs, Load graph will be horizontal.

For droop charater the No-load to Full load condition speed will fall and the speed Vs. Load graph slope will be negative.

The droop may vary from 4% to 6%. Lesser this droop percentage it will share more load for synchronised operation. The higher the droop percent it will share less load.

I think now it is clear to you.

DHAYANANDHAN.S