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Page 12
Figure 2.4 Digitrip Neutral Sensor Types
L
N
B -7
2
B -6
R /1
N o tes:
1
In th is sch em e , all b re ake r s eco nd ary curre nts (a t th e 10 0 m A lev el) are su m m e d to ge th er a t the P C
bo a rd d on ut tra nsform e r to se nse grou nd fa ult via e lem e n t R 5 .
2
D o no t jum p er on se con d ary c ontacts B -6 , B -7 . T h is w ill de fea t a ll g ro un d fau lt p ro tectio n in
ap p lica tio n fo r 4 p ole brea ker.
3
G rou nd fa ult style trip un it is insta lled .
Figure 2.5 4-Pole–3200A Frame Using Residual Ground Fault (Earth-Fault) Sensing
Courtesy of NationalSwitchgear.com
S ou rce
L
L
L
A
B
C
1
R /1
1
Lo a d
B lac k
K 1-2
+
Trip
A ctu a to r
K 1-3
-
10 :1
K 1-9
K 1-8
K 1-7
K 1-6
K 1-5
1
K 1-4
K 2-9
K 2-8
10 :1 A U X . C T
I.L. 70C1037H02
D ig itrip 52 0
w ith G F
1
R
5
Effective 8/13/99
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