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Effective 8/13/99
Page 11
I.L. 70C1037H02
In th is s ch e m e , a ll b re a ke r s e c o n d a ry c u rre n ts (a t th e 10 0 m A le v e l) a re s u m m ed to ge the r at th e P C
b o a rd d o n u t tra n s fo rm e r to s e n s e g ro u n d fa u lt v ia e le m e nt R
5
.
N o ju m p e r o n s e c o nd a ry co n ta cts B -6 , B -7 .
N e u tra l in p u t (if 4 -w ire ) is v ia co n ta cts B -4 , B -5 . N e u tra l c u rre n t in p u t to s e c o n d ar y c o n ta cts is 1 A ,
e q u iv a le n t to 1 p e r u nit g ro u n d .
S o u rc e
L
N
R
5
D ig itrip 5 2 0
w ith G F
R /1
R /1
3
3
2
2
1
1
K 2 -8
B -4
L o a d
N o te s :
B -6
K 1 -4
K 1 -3
1 0 :1
1 0 :1 A U X . C T
K 2 -9
K 2 -1
K 2 -7
B -5
B -7
K 1 -5
K 1 -2
B la c k
Trip
A c tu a to r
+
-
L
B
L
C
L
A
K 1 -6
K 1 -7
K 1 -8
K 1 -9
1
1
1
Figure 2.2 3-Pole, 4-Wire Breaker with Neutral Sensor Connections for 3200A Frame Using Residual GF Sensing
S ource
Loa d
K 2-8
K 2-9
B -4
B -6
20:1 A U X . C Ts
20:1
K 1-3
K 2-7
B -5
B -7
K 1-2
B lack
Trip
A ctua tor
+
-
L
A 2
L
B 1
L
B 2
L
C 1
L
A 1
L
N 1
L
N 2
L
C 2
K 1-4
K 2-1
K 1-5
K 1-6
K 1-7
K 1-8
K 1-9
200 0:1
200 0:1
200 0:1
200 0:1
200 0:1
200 0:1
200 0:1
200 0:1
1
2
R
5
D ig itrip 52 0
w ith G F
1
2
N otes:
In th is sch em e, all brea ker secon d a ry cu rrents (a t the 100 m A leve l) are su m m ed toge ther at the P C
b oa rd do nut transform e r to se nse grou n d fault via e lem e nt
.
In th is sch em e, th e current sensors in th e bre ake r p ole s are parallel-w ire d to a chieve a 4 000 am p
b reaker rating. O the r availa ble ratin gs in th is do u b le-w ide config ura tion a re 63 00 A , 5 00 0 A,
3 20 0A , 2500A , a nd 2000A .
R
5
Figure 2.3 Neutral Sensor Connections for 4000A Frame Using Residual Ground Fault Sensing