NOVAR 2100/2200 Operating Manual
•
Connection Type
( p. 72 ) needs to be set to
1
Y
3
or
1
d
3
.
The U1-voltage angle
is
recommended to be set automatically during so called ACD-process (see below).
•
Connection Mode
( parameter 74 ) determines if voltage signals are connected directly
(
-
-
-
) or via voltage transformers. In such case the
VT
-ratio must be set.
The VT-ratio must be set in form
Nominal primary voltage / Nominal secondary voltage
. For
very high primary voltages
the U-Multiplier
must be used.
•
Nominal frequency
f
NOM
( p. 75 ) must be set in compliance with the measurement network
nominal frequency to either 50 or 60 Hz.
•
Nominal Voltage U
NOM
( p. 75 )
and Nominal Power P
NOM
( p. 76 ) : For the voltage alarms
operation and other functions it is necessary to enter also the nominal ( primary ) voltage of
the measured mains
U
NOM
and nominal apparent three-phase power (input power) of the
connected load
P
NOM
( in units of kVA ). Although the correct setup of the
U
NOM
and
P
NOM
has
no effect on measuring operation of the instrument, it is strongly recommended to set at least
the
U
NOM
correctly.
The
U
NOM
is displayed either as line-to-neutral or line-to-line form depending on the
connection mode setup : “direct” or “via VT”, respectively.
Correct setting of the
P
NOM
is not critical, it influences percentage representation of powers
and currents and statistical processing of measuring in the software only. If the
P
NOM
of
measured network node is not defined, we recommend to set its value, for example, to the
nominal power of source transformer or to the maximum supposed power estimated
according current transformers ratio, etc.
3.1.1 Setup Example
Usually, it is only necessary to adjust the CT ratio. Next example shows how to do it :
Assuming that the ratio of used CTs is 750/1 A. First off all, it is necessary to switch display from
measured data branch (the ULN screen on the example below) to
the parameter branch
with the
button. The branch is indicated with the
symbol . Parameter 01 appears – target power factor &
control bandwidth.
Now scroll down with the
key to parameter 71, that is the CT ratio -its default value is 5/5 A. Enter
editing mode by pressing and holding the
until the value gets flashing.
As soon as the value flashes, release the
. Now you can change it. Increase primary value by
pressing of the
. If you keep it pressed two-speed autorepeat helps to reach target value quickly.
Then use multiple pressing of
and
for fine setup.
To change the secondary value, simply press the
. The button serves as toggle switch between 5
and 1.
CT Ratio Change Procedure Example
13
long
mutli
ple
mutli
ple
