GE P24DM - Page 198

R
Vs
IREF Is
I R R
IREF Is
st
F CT L
=
>
[ ]
=
+
( )
>
[ ]
2
where:
● R
CT
= the r
esistance of the CT winding
● R
L
= the resistance of the lead from the CT to the IED.
Note:
The above formula assumes negligible relay burden.
We recommend a stabilizing resistor, which is continuously adjustable up to its maximum declared resistance.
Chapter 7 - Restricted Earth Fault Protection P24xM
174 P24xM-TM-EN-2.1