ABB Relion 670 series - Instantaneous Residual Overcurrent Protection EFPIOC (50 N)

40 100 40 40 220t ms ms ms ms msD ³ + + + =
EQUATION1266 V1 EN (Equation 454)
where it is considered that:
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 and
the additional margin is 40 ms
9.3 Instantaneous residual overcurrent protection EFPIOC
(50N)
9.3.1 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
9.3.2 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.
9.3.3 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.
Section 9 1MRK 506 369-UUS -
Current protection
504 Line distance protection REL670 2.2 ANSI
Application manual