Instantaneous Residual Overcurrent Protection Efpioc (50N) - ABB REL650 Applications Manual

1MRK 506 334-UUS A
7.5
7.5.1
7.5.2
7.5.3
Application manual
• the operate time of overcurrent protection B1 is 40 ms
• the breaker open time is 100 ms
• the resetting time of protection A1 is 40 ms
• the additional margin is 40 ms
Instantaneous residual overcurrent protection EFPIOC
(50N)
Identification
Function description
Instantaneous residual overcurrent
protection
Application
In many applications, when fault current is limited to a defined value by the object
impedance, an instantaneous ground-fault protection can provide fast and selective
tripping.
The Instantaneous residual overcurrent EFPIOC (50N), which can operate in 15 ms (50
Hz nominal system frequency) for faults characterized by very high currents, is included
in the IED.
Setting guidelines
The parameters for the Instantaneous residual overcurrent protection EFPIOC (50N) are
set via the local HMI or PCM600.
Some guidelines for the choice of setting parameter for EFPIOC (50N) is given.
GlobalBaseSel: Selects the global base value group used by the function to define (IBase),
(VBase) and (SBase).
The setting of the function is limited to the operate residual current to the protection
(Pickup).
IEC 61850 IEC 60617
identification identification
EFPIOC
IN>>
IEF V1 EN
Section 7
Current protection
ANSI/IEEE C37.2
device number
50N
199