Technical description
4 Measurement functions
4.6 Maximum values of the last 31
days and twelve months
VM259.EN007
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4.6.
Maximum values of the last 31 days
and twelve months
Some maximum and minimum values of the last 31 days and
the last twelve months are stored in the non-volatile memory of
the device. Corresponding time stamps are stored for the last
31 days. The registered values are listed in the following table.
Measurement Max Min
Description
I
L1
, I
L2
, I
L3
X
Phase current (fundamental frequency value)
I
0
X
Residual current
S
X
Apparent power
P
X
X
Active power
Q
X
X
Reactive power
The value can be a one cycle value or an average according
parameter "Timebase".
Parameters of the day and month registers
Parameter
Value
Description
Set
Timebase
20 ms
200 ms
1 s
1 min
demand
Parameter to select the type of the
registered values.
Collect min & max of one cycle values
*)
Collect min & max of 200 ms average
values
Collect min & max of 1 s average values
Collect min & max of 1 minute average
values
Collect min & max of demand values (see
chapter 4.4)
S
ResetDays
Reset the 31 day registers
S
ResetMon
Reset the 12 month registers
S
*) This is the fundamental frequency rms value of one cycle updated every
20 ms.
4.7.
Voltage measurement mode
Line manager relay is always used in the three line to ground
voltages measurement mode. The configuration parameter
"Voltage measurement mode" must be set according the used
connection for the synchrocheck stage. If synchrocheck is not
used in the application this selection has no effect.
The available modes are:
―3LN/LLy‖
The synchrocheck voltage transformer is connected to line-to-
line voltages U
L12
.
―3LN/LNy ‖
The synchrocheck voltage transformer is connected to line-to-
line voltages U
L12
.
