RM 2106 / 2112
30
If the step size, current transformer or nominal
voltage of the power factor correction system
do not match the values in the table, then
the formula 1 on page 28 must be used to
calculate the response current.
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
reactive VA control system the following
conditions must be taken into account
when choosing stage ratings:
If all possible switching combinations
are sorted according to reactive power
(capacity), then the power difference
between two consecutive combinations
may not be more than 1.2 times the
smallest stage power.
When automatic response current identication
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 identication
is switched off (-4-), the relative value of the
switch outputs must be programmed manually.
The ashing LED in the stage display (a)
indicate the switch output to which the
relative value refers. Pressing the ”Select”
key (i) briey allows you to skip to the next
relative value.
The switch outputs with the lowest capacity
are assigned relative value 1.0. The relative
values for the bigger stages are calculated
as follows:
Formula 2:
Free switch outputs are assigned relative value
0.0. Only whole numbers can be entered as
factors.
Relative value
Stage power
Smallest stage power
==
zavoshelectric.ir
To Next Page
Loading...
