record of the ENVIS program. In our case (object name is “DEFAULT”) it was retrieved directly
from the instrument. It can later be adjusted manually.
–
Record Name -
The individual records in the measured object can be distinguished by their name
(eg. name of the transformer in the building). In that case “DEFAULT”. This is again a text string
of maximum length of 32 characters which can be adjusted later.
–
Other informative parameters of this tab group indicate the type of connected device (model, serial
number, etc.) and they can not be changed.
Configs
–
Install (fig. 5a)
*
Connection Mode
- Select the type of connection of the instrument — either direct voltage mea-
surement or via voltage transformers.
*
Connection Type
- Select type of measured network. You can choose from three-phase star, three-
phase delta or three-phase star with neutral voltage measurement. Aron connection type can also
be selected. Based on this setting, some quantities are calculated differently — for example when
three-phase delta is selected, no
U
LN
is measured nor calculated. Proper wiring corresponding
to individual selections will be illustrated in chapter 2.3.
*
Nominal Frequency
- This parameter should be set according to the nominal network frequency
measured at 50 or 60 Hz.
*
U
N OM
,
P
N OM
- Rated voltage and rated power. To be able to view the voltage output as a per-
centage of nominal value and the detection of voltage events, it is necessary to specify a nominal
(primary) voltage
U
N OM
and the nominal three-phase power (power)
P
N OM
. Although the set-
ting for
U
N OM
and
P
N OM
has no effect on the device measuring functionality, we recommend
to set at least the
P
N OM
correctly. Proper setting of
P
N OM
is a critical issue as it affects the
displayed relative values of power and current and some of the data interpretation functions in
ENVIS software. The setting can moreover be adjusted later. If the value of
P
N OM
at the mea-
sured point can not be determined, we recommend to set the value according to the nominal
power supply of the transformer, or to estimate this value as the maximal expected.
U
N OM
value
is displayed in the format as phase/line voltage for convenience.
*
VT Ratio
- Must be set accordingly to the primary measuring voltage transformer transfer ratio.
Available only when
via VT
Connection Mode is selected.
*
Range I
- This parameter sets the conversion of current range. Factory default value corresponds
to range of specific current input variant stated after slash (for example
Range I: 50 / 50
) and
usually shouldn’t be changed!
*
Multiplier I
- The SMC 144 device can be used for direct or indirect measurement. In case of
direct current measurement (see figure 4a) set the
Multiplier I
to 1. In case of indirect current
measurement (as on figure 4b)
Multiplier I
must be set equel to primary current transformer
ratio. If, for example, primary CT with ratio 100/5 is used, set multiplier to
100
5
= 20. Another
example, when
Multiplier I
can be used, is winding more than one loop of measured conductor
through current transformer for sensitivity extension (and range reduction). For example for 4
loops
Multiplier I
should be set to
1
4
= 0
.
25.
–
General (fig. 5b)
*
Time Settings
·
Timezone
- Time zone must be set according to the local requirements.
The setting is
important for correct interpretation of local time, which also determines the actual allocation
of tariff zones of the meter.
·
Synchronization
- This parameter determines how the device synchronizes. It is possible to use
synchronization over communication line (for example in cooperation with ENVIS.Online),
synchronization by one minute period pulses on first digital input (if available) or no synchro-
nization at all.
8