Outputs WARNING and URES_WARNING are always internally active whenever outputs
ALARM and URES_ALARM, respectively, are active.
The receiver activates the WARNING, URES_WARNING, ALARM and URES_ALARM
outputs if any of the quality bits, except for the derived bit, is activated. When the
receiver is in the test mode, it accepts SMV frames with test bit without activating
the WARNING, URES_WARNING, ALARM and URES_ALARM outputs.
Frequency adaptive measurements for three-phase voltages can be activated with
the setting
Frequency adaptivity
. Four selections are provided.
Table 127: Frequency adaptivity setting for three-phase voltage measurement
Setting value Description
Disable Frequency adaptive measurements are disabled for this
UTVTR. Measurements are fixed to nominal frequency de-
fined with Configuration> System> Rated frequency.
Enable Frequency adaptive measurements are enabled. In this case,
the estimated network frequency is defined by another pre-
processing block.
Main frequency source Frequency adaptive measurements are enabled and other
preprocessing blocks follow the network frequency defined
by this preprocessing block.
Backup frequency source Frequency adaptive measurements are enabled. If the main
frequency source cannot determine the network frequency,
the voltages of this preprocessing block determine the net-
work frequency.
All three phases must to be connected if the main or backup frequency
source is selected.
Frequency adaptive measurements for residual voltage can be activated with the
setting
Frequency adaptivity
. Two selections are provided.
Table 128: Frequency adaptivity setting for residual voltage measurement
Setting value Description
Disable Frequency adaptive measurements are disabled for this
UTVTR. Measurements are fixed to nominal frequency de-
fined with Configuration> System> Rated frequency.
Enable Frequency adaptive measurements are enabled. In this case,
the estimated network frequency is defined by another pre-
processing block.
UTVTR setting
Frequency adaptivity
is visible only if system setting
Configuration> System> Frequency adaptivity is set to "Enable".
3.17.3.4 Residual voltage scaling
Calculated U
0
is scaled to the same level as measured U
0
. The scaling is determined
by the ratio of ULTVTR primary voltage and RESTVTR primary voltage within one
UTVTR instance. The assumption is open-delta U
0
measurement type.
1MRS759142 F
Basic functions
REX640
Technical Manual
199
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