Relay Setting for Generator Protection

[MTNMP]

Hello,
I have given below 2 example for setting the value for 2 functions in a Relay.

ex. Differential Protection

SETTING REFERENCES:
Is1: 10% of rated current (Gen) = 0,1 x Irated
Is2: set to 120% of rated current = 1,2 x Irated

and for ex.Over Voltage Protection
Settings according to generator recommended values:
59.1: V> 1 Trip stage: 1,1...1,2 rated U , max. 6 sec
59.2: V> 2 Trip stage: 1,2...1,4 rated U , 0,1 sec

MY QUESTION IS :

is these Irated and rated U values taken of the CT's or we have to do any special calculations for this.

Thanks in advance
Manju

 

[davidbeach]

Primary values referenced to the secondary of the CT and VT (can't get much useful information for a 59 from a CT).