ABB RELION REX640 Technical Manual page 703

1MRS759142 C
REX640
Technical Manual
GUID-A59B0E04-AC24-4382-B610-6E39697085FA V1 EN
Figure 388: Example for busbar differential protection
Bus data:
U 20 kV
n
I 2000 A
n
I 25 kA
kmax
10 feeders per protected zone including bus coupler and incomer.
CT data is assumed to be:
CT 2000/1 A
R 15.75 Ω
in
U 436 V
kn
I <7 mA (at U )
e kn
R 1Ω
m
Section 4
Protection functions
697