Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
4.1.2.5
REX640
Technical Manual
Improper analog channel configuration causes a validation error if the analog
channels are not completely configured or they do not match with certain settings. For
troubleshooting, check the contents of this chapter and also the preprocessing blocks
in this document. The configuration can be written to the protection relay once the
mismatch is corrected.

Operation principle

The function can be enabled and disabled with the Operation setting. The
corresponding parameter values are "on" and "off".
The operation of DPHxPDOC can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
U_A_AB
U_B_BC
U_C_CA
U3P
U
1
U
2
I_A
I_B
I3P
I_C
I
2
NON_DIR
ENA_MULT
BLOCK
GUID-F09231F3-0D02-4C90-8A9B-852F69AD0BC7 V1 EN
Figure 183: Functional module diagram
Directional calculation
The directional calculation compares the current phasors to the polarizing phasor. A
suitable polarization quantity can be selected from the different polarization
quantities, which are the positive sequence voltage, negative sequence voltage, self-
polarizing (faulted) voltage and cross-polarizing voltages (healthy voltages). The
polarizing method is defined with the Pol quantity setting.
Table 366: Polarizing quantities
Polarizing quantity
Pos. seq. volt
Neg. seq. volt
Self pol
Cross pol
Directional
Phase
calculation
selection
logic
Level
detector
Blocking
logic
Description
Positive sequence voltage
Negative sequence voltage
Self polarization
Cross polarization
Section 4
Protection functions
Timer
t
OPERATE
t
START
FAULT_DIR
DIRECTION
327