Differential protection
(87A, 87B, 87C) for
Zone A
Differential protection
(87A, 87B, 87C) for
Zone B
Bus coupler
Stabilizing
resistor R
s
Stabilizing
resistor R
s
2
…....7
F
e
e
d
e
r
1
F
e
e
d
e
r
8
2000/1A
2000/1A
2000/1A
2000/1A
Y
2000/1A
Y
GUID-97462931-644F-4EFD-8C9A-AF61A3C870B8 V1 EN
Figure 286:
Example for busbar differential protection
Bus data:
V
n
20 kV
I
n
2000 A
I
kmax
25 kA
10 feeders per protected zone including bus coupler and incomer.
CT data is assumed to be:
CT
2000/1 A
R
in
15.75 Ω
V
kn
436 V
I
e
<7 mA (at U
kn
)
R
m
1Ω
Section 4
1MAC059074-MB A
Protection functions
562
615 series ANSI
Technical Manual
Summary of Contents for Relion 615 series
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