ABB RELION REX640 - 4.2.2.2 Function block; 4.2.2.3 Functionality; 4.2.2.4 Analog channel configuration

Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
51G/N-1
Directional earth-fault protection,
high stage
DEFHPDEF Io>> ->
67G/N-1
51G/N-2
4.2.2.2 Function block
Figure 254: Function block
4.2.2.3 Functionality
The directional earth-fault protection function DEFxPDEF is used as directional
earth-fault protection for feeders.
The function starts and operates when the operating quantity (current) and
polarizing quantity (voltage) exceed the set limits and the angle between them
is inside the set operating sector. The operate time characteristic for low stage
(DEFLPDEF) and high stage (DEFHPDEF) can be selected to be either definite time
(DT) or inverse definite minimum time (IDMT).
In the DT mode, the function operates after a predefined operate time and resets
when the fault current disappears. The IDMT mode provides current-dependent
timer characteristics.
The function contains a blocking functionality. It is possible to block function
outputs, timers or the function itself.
4.2.2.4 Analog channel configuration
DEFxPDEF has four analog group inputs which must be properly configured.
Table 528: Analog inputs
Input Description
I3P
1
Three-phase currents, necessary when Pol
quantity is set to "Neg. seq. volt."
IRES Residual current (measured or calculated)
Table continues on the next page
1
Can be connected to GRPOFF if Pol quantity is set to "Zero seq. volt" or Directional mode is set to
"Nondirectional".
Protection functions 1MRS759142 F
452 REX640
Technical Manual