Table 390: Special conditions
Condition Description
U3P connected to real measurements The function can work with any two phase
voltage channels connected but it is recom-
mended to connect all three voltage chan-
nels.
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.
4.1.2.5 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.
ENA_MULT
BLOCK
Level
detector
NON_DIR
OPERATE
START
Phase
selection
logic
t
Timer
t
I3P
I_A
I_B
I
2
U3P
U_A_AB
U_B_BC
U_C_CA
U
1
U
2
Blocking
logic
Directional
calculation
I_C
DIRECTION
FAULT_DIR
Figure 206: 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.
Protection functions
1MRS759142 F
346 REX640
Technical Manual
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