40 100 40 40 220t ms ms ms ms msD ³ + + + =
EQUATION1266 V1 EN (Equation 186)
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
9.3.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Instantaneous residual overcurrent
protection
EFPIOC
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 earth-fault protection can provide fast and selective
tripping.
The Instantaneous residual overcurrent EFPIOC, 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 are set
via the local HMI or PCM600.
Some guidelines for the choice of setting parameter for EFPIOC is given.
Common base IED values for primary current (IBase), primary voltage (UBase) and
primary power (SBase) are set in the global base values for settings function
GBASVAL.
1MRK 502 071-UEN - Section 9
Current protection
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062 335
Application manual
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