Operation Principle - ABB RELION REX640 Technical Manual

1MRS759142 C
4.2.2.5
REX640
Technical Manual
Table 476: Special conditions
Condition
U3P connected real measurements
URES calculated
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 DEFxPDEF can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
Io
IRES
I
2
I3P
Uo
URES
U
U3P 2
ENA_MULT
RCA_CTL
BLOCK
GUID-08A0C62A-8285-4685-BDD8-1EBBFCF2E5B6 V1 EN
Figure 222: Functional module diagram
Level detector
The magnitude of the operating quantity is compared to the set Start value and the
magnitude of the polarizing quantity is compared to the set Voltage start value. If both
the limits are exceeded, the level detector sends an enabling signal to the timer
module. When the Enable voltage limit setting is set to "False", Voltage start value has
no effect and the level detection is purely based on the operating quantity. If the
ENA_MULT input is active, the Start value setting is multiplied by the Start value Mult
setting.
Description
The function can work with any two phase voltage
channels connected but it is recommended to
connect all three voltage channels.
Setting
particular UTVTR.
Timer
Level
detector
t
t
Directional
calculation
Blocking
logic
Section 4
Protection functions
VT connection must be "Wye" in that
OPERATE
START
FAULT_DIR
DIRECTION
415