Instantaneous Residual Overcurrent Protection Efpioc - ABB REG670 Applications Manual

1MRK 502 071-UEN -
9.3
9.3.1
9.3.2
9.3.3
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
D ³ + +
t 40 ms 100 ms
EQUATION1266 V1 EN
where it is considered that:
the operate time of overcurrent protection B1 is 40 ms
the breaker open time
the resetting time of protection A1
the additional margin
Instantaneous residual overcurrent protection
EFPIOC
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 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.
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.
+ =
40 ms 40 ms 220 ms
is 100 ms
is 40 ms and
is 40 ms
IEC 61850
identification
EFPIOC
Section 9
Current protection
(Equation 186)
IEC 60617 ANSI/IEEE C37.2
identification device number
50N
IN>>
IEF V1 EN
335