Input Description
U3P
1
Three-phase voltages, necessary when
Pol
quantity
is set to "Neg. seq. volt."
URES
2
Residual voltage (measured or calculated),
necessary when
Pol quantity
is set to "Zero
seq. volt."
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 529: Special conditions
Condition Description
U3P connected 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.
URES calculated Setting
VT connection
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.
4.2.2.5 Operation principle
The function can be enabled and disabled with the
Operation
setting. The
corresponding parameter values are "On" and "Off".
The operation of DEFxPDEF can be described using a module diagram. All the
modules in the diagram are explained in the next sections.
2
Can be connected to GRPOFF if
Pol quantity
is set to "Neg. seq. volt" or
Directional mode
is set to
"Nondirectional".
1MRS759142 F Protection functions
REX640
Technical Manual
453
To Next Page
Loading...
