GE DGP Series Instruction Manual page 57

2 CALCULATION OF SETTINGS
20
18
16
14
12
TRIP AREA FOR
INTERNAL FAULTS
10
8
6
4
2
0
0 2
I I
s s
Gen. to bus
Bus to Gen.
Figure 2–5: 87G CHARACTERISTICS – K1 = 10%, PICKUP = 0.3 A
GE Power Management
MARGIN FOR
CT ERROR
4 6 8
I Amperes
S
I
R
G
DGP/87G
DGP Digital Generator Protection System
2.3 PROTECTION FUNCTION SETTINGS
MARGIN FOR
CT ERROR
10 12 14
I
S
BUS
2
External Fault
No CT Error
(I = I )
R S
16 18 20
2-
17