7.5.5
Settings
Table 99:
EFPIOC (50N) Group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
Operation
Disabled
Enabled
-
-
Disabled
Disable/Enable Operation
Pickup
1 - 2500
%IB
1
200
Operate residual current level in % of IBase
Table 100:
EFPIOC (50N) Non group settings (basic)
Name
Values (Range)
Unit
Step
Default
Description
GlobalBaseSel
1 - 6
-
1
1
Selection of one of the Global Base Value
groups
7.5.6
Monitored data
Table 101:
EFPIOC (50N) Monitored data
Name
Type
Values (Range)
Unit
Description
IN
REAL
-
A
Residual current
7.5.7
Operation principle
The sampled analog residual currents are pre-processed in a discrete Fourier filter (DFT)
block. From the fundamental frequency components of the residual current, as well as
from the sample values the equivalent RMS value is derived. This current value is fed to
the Instantaneous residual overcurrent protection (EFPIOC,50N). In a comparator the
RMS value is compared to the set operation current value of the function (
Pickup
). If the
residual current is larger than the set operation current a signal from the comparator is set
to true. This signal will, without delay, activate the output signal TRIP.
7.5.8
Technical data
Table 102:
EFPIOC (50N) technical data
Function
Range or value
Accuracy
Operate current
(1-2500)% of lBase
±
1.0% of I
n
at I
£
I
n
±
1.0% of I at I > I
n
Reset ratio
> 95%
-
Operate time
20 ms typically at 0 to 2 x I
set
-
Reset time
30 ms typically at 2 to 0 x I
set
-
Table continues on next page
Section 7
1MRK 506 335-UUS A
Current protection
214
Technical manual
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