1MRS757454 D
611 series
Technical Manual
Inv. curve A
The inverse time equation for curve type A is:
k
t s
[ ]
=
2
I
2
I
r
GUID-D8A4A304-6C63-4BA4-BAEA-E7891504557A V1 EN
t[s] Operate time in seconds
Machine time Mult
k
Set
I
Negative-sequence current
2
Rated current
I
Set
r
Section 4
Protection functions
(Equation 26)
245