ABB RELION REX640 Technical Manual page 452

Protection functions
Function description
Directional earth-fault protection,
high stage
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
I3P
IRES
Table continues on the next page
1
Can be connected to GRPOFF if
"Nondirectional".
452
1
Pol quantity is set to "Zero seq. volt" or Directional mode is set to
IEC 61850 IEC 60617
identification identification
DEFHPDEF Io>> ->
Description
Three-phase currents, necessary when
quantity is set to "Neg. seq. volt."
Residual current (measured or calculated)
1MRS759142 F
ANSI/IEEE C37.2
device number
51G/N-1
67G/N-1
51G/N-2
Pol
REX640
Technical Manual