7.5.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Instantaneous residual overcurrent
protection
EFPIOC
IN>>
IEF V1 EN
50N
7.5.2
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.
7.5.3
Function block
ANSI08000003-1-en.vsd
EFPIOC (50N)
I3P*
BLOCK
TRIP
ANSI08000003 V1 EN
Figure 97:
EFPIOC (50N) function block
7.5.4
Signals
Table 97:
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 98:
EFPIOC (50N) Output signals
Name
Type
Description
TRIP
BOOLEAN
Trip signal
1MRK 506 335-UUS A
Section 7
Current protection
213
Technical manual
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