Solare Datensysteme Solar-Log - Manual (Page 144)

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Special functions
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SAVE settings.
The characteristic curve displayed changes according to the values entered.
4-point characteristic curve
By selecting "4-point characteristic curve" it is possible to define a characteristic curve using four points.
Procedure:
•
Select variable reactive power via the characteristic curve Q(U) as the type.
•
Activate the interfaces .
•
Select 4-point characteristic curve .
•
Define the characteristic curve points A, B, C and D based on the boxes U/Uc, Q/SAmax and put a
check in front of inductive/under-excited.
•
SAVE settings.
The characteristic curve displayed changes according to the values entered.
Reductions
The following configuration options are available in the Reductions section.
•
Gradient limit (adjustment rate):
If the power company requires a reduction, it has to be configured in this box. (Enter the values in
seconds)
•
Max. cos(phi) inductive/underexcited and max. cos(phi) capacitive/over-excited:
A maximum shift factor can be defined wit this the reduction. With this, it can be that less reactive
power is fed-in into the grid than what the characteristic curve allows in the partial load range in
order to maintain the shift factor limits.
Note
Entering zero as the value deactivates the particular limit.