poly-phase induction motor 1

[nandarora]

Can anyone tell me that what will happen if I make the rotor of induction generator to rotate at more than double the synchronous speed i.e. I mean that how will the machine behave if the slip is less than -1.Will it simply behave like an asynchronous generator or will there be some breaking in generator?
I even can't even find the torque slip curve for slip less than -1. Most of the sites do not mention about slip being less than -1.
For reference a link is given below from where I was studying Poly-phase Induction motor:

http://electricalstudy.net/lesson/torque-slip-character-sticks/

http://electricalstudy.net/lesson/poly-phase-induction-generator-or-asynchronous-generator-2/

 

[nandarora]

Thanks a lot for all your replies. They were really informative.
Sorry for the mistake....I wanted to write braking and not braking.
Can anyone give me somelink from where I can study operation of islanded generator in detail