Operation Principle - ABB RELION REX640 Technical Manual

Section 5
Protection related functions
5.13.5
1178
Table 1097: Analog inputs
Input
1)
URES
1) Can be connected to GRPOFF if
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.
Table 1098: Special conditions
Condition
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 RCRWPSCH can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
IRV
BLK_IRV
Uo
URES
CB_OPEN
CR
BLK_WEI1
BLK_WEI2
FF
BLOCK
GUID-CD351C4B-8E12-4CC8-9242-AF468C238BE0 V1 EN
Figure 635: Functional module diagram
Description
Residual voltage (measured or calculated)
Necessary when
Operate"
Wei mode is set to "Off" or "Echo"
Description
The function requires that all three voltage
channels are connected to calculate the residual
voltage. Setting
that particular UTVTR.
Current
OPR_IRV
reversal
logic
OPR_WEI
Weak end
ECHO
infeed
logic
CR
1MRS759142 C
Wei mode is set to "Echo and
VT connection must be "Wye" in
REX640
Technical Manual