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.
2.1.1 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.
Target CT value is prepared now and we can leave the edit mode with (short) pressing the
. The value is stored into the instrument memory and the flashing stops.
CT Ratio Change Procedure Example
Now return to so called main parameter branch (see description below) with next pressing the
and then you can scroll to other parameters with
and
and edit
them in a similar way or you can return to the measured data branch with the
.
The summary of all instrument parameters is stated in the table below. Their description is stated in the full-scale manual.
long
multi
ple
multi
ple
