Effective 8/13/99
Page 14
I.L. 70C1037H02
Figure 2.8 Zero Sequence Sensing Scheme for 3200A Frame
B reaker M 2 trips since this is the only breaker seeing the I fault via elem ent R .
N o jum per on B -6, B -7 term inals - all breakers are progra m m ed for standard R esidu al Ground F ault
protection.
A U X C Ts not show n. W iring n eeded at system level is show n as a d otted lin e.
C apital letters repre se nt prim ary cu rren t. L ow ercase letters represent second ary current.
Th e three breakers (M 1, M 2 , and T) m ust all have th e sam e breaker/sensor rating .
G
5
N otes:
Figure 2.9 Multiple Source/Multiple Ground Scheme
R 5
R 5
R 5
f
f
T
M 2
M 1
B 5
B 4
I /2
G
I /2
G
I /2
G
I /2
G
I
G
I
G
i
g
i
g
i /2
g
i /2
G
i /2
g
i /2
g
i /2
g
N eutral S ensors W ired
in a Loop C on fig uration
B 5
B 5
B 4
B 4
N
N
Inte rn al
D ig itrip
S ensor
G roun d Fa ult
