Table 1204: Analog inputs
Input Description
URES
1
Residual voltage (measured or calculated), necessary when
Wei mode
is set to "Echo and Operate"
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 1205: Special conditions
Condition Description
URES calculated The function requires that all three voltage channels are con-
nected to calculate the residual voltage. Setting
VT connec-
tion
must be "Wye" in that particular UTVTR.
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.
5.13.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "on" and "off".
The operation of RCRWPSCH can be described with a module diagram. All the
modules in the diagram are explained in the next sections.
CR
CB_OPEN
URES
ECHO
OPR_WEI
CR
Current
reversal
logic
Weak end
infeed
logic
BLK_WEI1
BLK_WEI2
FF
BLOCK
IRV
BLK_IRV OPR_IRV
Uo
Figure 722: Functional module diagram
1
Can be connected to GRPOFF if
Wei mode
is set to "Off" or "Echo".
1MRS759142 F Protection related functions
REX640
Technical Manual
1275
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