Woodward
Technical Manual WIC1
22
DOK-TD-WIC1E, Rev. L
5.1.3 Earth current protection
Current
Internal calculated cumulative current formation
I
E>
0.2 to 2.5 x IS in steps of 0.05 x IS
when adjusting via the interface for the WIC1-1
Tripping time
t
IE>
0.1s to 20s in steps of 0.01 when adjusting via
the interface for the WIC1-1
IE> = HEX-Switch 7/DIP-Switch 4 (1
– 4)
DIP 4-1
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF ON OFF ON OFF ON OFF ON
DIP 4-2
OFF OFF
ON
ON
OFF OFF
ON
ON
OFF OFF ON ON OFF OFF ON ON
DIP 4-3
OFF OFF OFF OFF
ON
ON
ON
ON
OFF OFF OFF OFF ON ON ON ON
DIP 4-4
OFF OFF OFF OFF OFF OFF
OFF
OFF
ON ON ON ON ON ON ON ON
HEX 7
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
x Is
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0 1.2 1.4 1.6 1.8 2.0 2.5 Exit
tIE> = HEX-Switch 8/DIP-Switch 4 (5
– 8)
DIP 4-5
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF ON OFF ON OFF ON OFF ON
DIP 4-6
OFF OFF
ON
ON
OFF OFF
ON
ON
OFF OFF ON ON OFF OFF ON ON
DIP 4-7
OFF OFF OFF OFF
ON
ON
ON
ON
OFF OFF OFF OFF ON ON ON ON
DIP 4-8
OFF OFF OFF OFF OFF OFF
OFF
OFF
ON ON ON ON ON ON ON ON
HEX 8
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
time (s)
0.1
0.2
0.4
0.6
0.8
1
1,5
2
2.5
3
3,5
4
6
8
10
20
The earth current tripping is blocked if actually measured phase current exceeds 5x Is (rated current)
I>
I>>
IE>
or
I> Exit-function
I>> Exit-function
IE> Exit-function
Block if
I
is > 5x Is
Trip
In theory the I> overcurrent and I>> short circuit function can be disabled. If the I> stage is disabled and the I>>
value is set to >5x Is the
earth current stage can’t trip if a measured current is higher than 5x Is.
The function is implemented due to accuracy of earth current calculation in combination with the lowest setting of
earth current element.
