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4.6 Relative value of the switch
outputs -6-
These values refer to the relative stage
ratings.
Example:
A system has the following stages:
Stage rating
Relative value
6.2 kvar
=>
1.0
6.2 kvar
=>
1.0
12.5 kvar
=>
2.0
25 kvar
=>
4.0
25 kvar
=>
4.0
0 kvar
=>
0.0
Note:
To assure correct operation of the reac-
tive VA control system the following con-
ditions must be taken into account when
choosing stage ratings:
If all possible switching combinations are
sorted according to reactive power (ca-
pacity), then the power difference be-
tween two consecutive combinations may
not be more than 1.2 times the smallest
stage power.
When automatic response current identi-
fication is switched on (-4-), the relative
value is automatically determined by the
control relay. This can be read under
setup code -6- but not altered.
When automatic response current identi-
fication is switched off (-4-), the relative
value of the switch outputs must be pro-
grammed manually.
The flashing LED in the stage display (a)
indicate the switch output to which the
relative value refers. Pressing the ”Se-
lect”key (i) briefly allows you to skip to
the next relative value.
The switch outputs with the lowest ca-
pacity are assigned relative value 1.0.
The relative values for the bigger stages
are calculated as follows:
Formula 2:
Relative value
Stage power
Smallest stage power
=
Free switch outputs are assigned relative
value 0.0. Only whole numbers can be
entered as factors.
4.7 Service -7-
The fundamental wave currents presently
flowing in the current path (j) of the con-
trol relay and be displayed under this
point.
The display for inductive or capacitive
operating status (b) can be used to de-
termine which current is displayed.
ind. and cap. off
=> active current
ind. or cap. off
=> reactive current
ind. and cap. on
=> apparent current
