ABB REO 517 Applications Manual page 112

102
Sudden current change function (SCC)
The relay setting value is given in percentage of the secondary base current value, I
associated with the current transformer input I1. The value is given from this formula:
Is
SE C
⋅
I -------------- - 100
=
set
I
1b
&KDSWHU 
&XUUHQW
,
1b
(Equation 48)