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Reactive Power Controller
= Key 1 = Key 2 = Key 3
Confirm selection with
key 1.
Text "on" flashes.
Set function "power
station service" to "oFF" using key 2 and to "on" using
key 3.
Confirm with key 1 and continue with expanded pro-
gramming pressing key 3.
Power station service
By setting "power sta-
tion service" the reac-
tion of the controller at
small currents is con-
trolled.
Presetting: Power station service = "oFF"
Power station service= "oFF"
If no or a very small current is flowing through the
current transformer, all connected capacitor stages are
switched off one after the other.
Power station service = "on"
If delivery (power station service) and consumption is
possible, connected stages must remain connected to
the net, even if no current is measured.
Programming
Example: Power station service
Go to power station service in expanded programming
using key 3.
If real power is generated in a certain application, the
following situations can arise:
Case a.
The generated real power is smaller than the demand.
Additionally real power is delivered by the energy sup-
plier.
Case b.
The generated real power is bigger than the demand.
Real power is supplied.
Case c.
The generated real power corresponds to the demand.
In all cases the required reactive power is supplied by
the energy supplier, or even better, by a compensation
system.
The following situation can come into being. The needed
real power is completely generated (case c.) by the gen-
erator, and the reactive power is completely supplied
by a compensation system.
There is no current flowing through the current trans-
former. If the power station service, by mistake, is on
"oFF", the capacitor stages are disconnected. Then a
reactive current is flowing again through the current
transformer. The controller detects a need for compen-
sation, and connectes the stages again. The reactive cur-
rent is compensated. Again, no current is flowing.
The problem is, that the number of switchings is in-
creased.
For power station service, especially in case c, the power
station service should be set to "on".
Diagr.: Connection example power station service
reactive power
Blindleistung
real power
Wirkleistung
L1
Prophi
MG
reactive power compensation system
Blindleistungs-Kompensationsanlage
consumer
Verbraucher
generator
Generator
L2
L3
k l
10200610
Prog
Prog
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