NHP TemBreak PRO, User Manual

Page: 34 / 105

Protection Settings
34
TemBreak PRO
B_BE-UM-001-EN
– V1.1.0
Ground/Earth Fault Protection (GF)
Ground Fault (GF) protection is protection against high strength insulation / earth faults. Ground fault is available for the B400_BEG to B1600_BEG in 3P
and 4P MCCBs.
GF is independent time protection and fixed at 20% of I
n
.
GF pickup current I
g
is fixed at I
g
= 0.2 x I
n
and is not adjustable.
The l
g
trip threshold tolerance for ground protection is ±15%.
GF time delay t
g
is also fixed at t
g
= 200ms and is not adjustable.
The trip time tolerance for ground protection is -20 ms / +50 ms
GF protection can be turned ON or OFF using the DIP switch on the MCCB by setting the GF switch (position 1) to the ON or OFF position, respectively.
Short Time Delay Settings Description
G
I
g
= 0.2 x I
n
Ground fault protection threshold
t
g
= 200 ms Ground fault delay
Notice : Enabling GF for 3 pole MCCBs on a 4-wire system may result in nuisance tripping in the case of
imbalanced loads. It is recommended in this case that GF should be disabled.