Generator Decrement Curve - "With Field Forcing" & "Without Field Forcing"

[Mafruha]

Hi Everyone,

I am plotting a decrement curve for 128KVA, 208V, 3PH, Y connected kohler Generator . There are two options to plot: 1. With Field Forcing 2. Without Field Forcing. I need to coordinate my generator output breaker with decrement curve.

Which option should be considered to plot the decrement curve ?

With Field forcing option the decrement curve moves to the right in TCC and I have to set up my generator output breaker for higher settings.

I would appreciate any kind of inputs on this.

Thanks all.

 

[mayanees]

Google SKM generator decrement curve and it's the first thing that pops up.