Functionality; Analog Channel Configuration - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.2.3
4.2.2.4
414

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.

Analog channel configuration

DEFxPDEF has four analog group inputs which must be properly configured.
Table 475: Analog inputs
Input
1)
I3P
IRES
1)
U3P
2)
URES
1) Can be connected to GRPOFF if
directional"
2) Can be connected to GRPOFF if
directional"
See the preprocessing function blocks in this document for the
possible signal sources. The GRPOFF signal is available in the
function block called Protection.
There are a few special conditions which must be noted with the configuration.
Description
Three-phase currents
Necessary when
volt."
Residual current (measured or calculated)
Three-phase voltages
Necessary when
volt."
Residual voltage (measured or calculated)
Necessary when
volt."
Pol quantity is set to "Zero seq. volt" or Directional mode is set to "Non-
Pol quantity is set to "Neg. seq. volt" or Directional mode is set to "Non-
1MRS759142 C
Pol quantity is set to "Neg. seq.
Pol quantity is set to "Neg. seq.
Pol quantity is set to "Zero seq.
REX640
Technical Manual