4.2 Minimum and maximum values
4 Measurement functions
Technical description
100
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VM55.EN005
4.2.
Minimum and maximum values
Minimum and maximum values are registered with time
stamps since the latest manual clearing or since the device has
been restarted. The available registered min & max values are
listed in the following table.
Min & Max
measurement
Description
U12, U23, U31
Line-to-line voltage
Uo
Zero sequence voltage
f
Frequency
The clearing parameter "ClrMax" is common for all these
values.
Parameters
Parameter
Value
Description
Set
ClrMax
Clear
Reset all minimum and maximum
values
S
4.3.
Voltage measurement modes
Depending on the application and available voltage
transformers, the relay can be connected either to line-to-line
voltages or phase-to-ground voltages. The configuration
parameter "Voltage measurement mode" must be set according
the used connection.
The available modes are:
“3LN+LLy/LNy”
This mode is used with the synchrocheck function. See Table
2.10-1.
“3LN+Uo”
The device is connected to line-to-netural voltages U
L1
- U
L3
and
to zero sequence voltage U
0
. The phase-to-phase voltages are
calculated. See Figure 8.7-3.
The overvoltage protection is always based on the line-to-line
voltage regardless of the measurement mode.
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