2-24 Installation Date Code 20001006
SEL-351 Instruction Manual
Current Channel IN does not need to be connected. Channel IN provides current I
N
for the neutral ground overcurrent
elements. Separate from Channel IN, the residual ground overcurrent elements operate from the internally derived
residual current I
G
(I
G
= 3I
0
= I
A
+ I
B
+ I
C
). But in this residual connection example, the neutral ground and residual
ground overcurrent elements operate the same because I
N
= I
G
.
Figure 2.14: SEL-351 Relay Provides Dedicated Breaker Failure Protection
Courtesy of NationalSwitchgear.com
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