6.3.2 Functionality
The Instantaneous residual overcurrent protection EFPIOC (50N) has a low transient
overreach and short tripping times to allow the use for instantaneous ground-fault
protection, with the reach limited to less than the typical eighty percent of the line at
minimum source impedance. EFPIOC (50N) is configured to measure the residual current
from the three-phase current inputs and can be configured to measure the current from a
separate current input. EFPIOC (50N) can be blocked by activating the input BLOCK.
6.3.3 Function block
ANSI08000003-1-en.vsd
EFPIOC (50N)
I3P*
BLOCK
TRIP
ANSI08000003 V1 EN
Figure 35: EFPIOC (50N) function block
6.3.4 Signals
Table 37: EFPIOC (50N) Input signals
Name
Type Default Description
I3P GROUP
SIGNAL
- Three phase group signal for current inputs
BLOCK BOOLEAN 0 Block of function
Table 38: EFPIOC (50N) Output signals
Name
Type Description
TRIP BOOLEAN Trip signal
6.3.5 Settings
Table 39: 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
Section 6 1MRK 511 287-UUS A
Current protection
96
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