GE DGP Series Instruction Manual page 54

2.3 PROTECTION FUNCTION SETTINGS
20
2
18
16
14
12
10
8
6
4
2
0
0
I I
s s
Gen. to bus
Bus to Gen.
2-
14
TRIP AREA FOR
INTERNAL FAULTS
2 4 6
I
Figure 2–2: 87G CHARACTERISTICS – K1 = 1%, PICKUP = 0.3 A
DGP Digital Generator Protection System
MARGIN FOR
CT ERROR
8 10 12
I Amperes
S
I
R S
G
DGP/87G
2 CALCULATION OF SETTINGS
External Fault
No CT Error
(I = I )
R S
MARGIN FOR
CT ERROR
14 16 18
BUS
GE Power Management
20