ABB RELION REX640 Technical Manual page 703

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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
m
Section 4
Protection functions
697

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