Power Station Service - janitza Prophi Operating Instructions Manual

Reactive Power Controller

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.
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.
L1
L2
L3
reactive power compensation system
Blindleistungs-Kompensationsanlage
Diagr.: Connection example power station service
= Key 1
Prog
Prog
k l
Prophi
= Key 2 = 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
station service should be set to "on".
reactive power
real power
Blindleistung
Wirkleistung
M
consumer
Verbraucher
power
G
generator
Generator
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