The diagram shows that when the generator breaker is synchronised, the mains breaker will be opened automatically after a time
delay (t). Later the mains breaker is synchronised, and the generator breaker is opened after the time delay (t). The time delay is
measured in seconds and can be adjusted from 0.10 to 99.90 seconds.
INFO
The same time delay is used for both generator and mains breaker synchronisation.
INFO
If the function is used in a Power Management (option G5) application, then the overlap will occur between the mains
breaker and the tie breaker on the AGC mains.
INFO
The time delay typed in the set point is a maximum time. This means that if 0.10 seconds are used, the two breakers will
never be closed at the same time for a longer delay than the set point.
The short time parallel function is set up in menu 2760 Overlap.
6.18 Frequency- or voltage-dependent droop
This droop function is a mains aid function. It can be used when the genset is running parallel to the mains in the following modes:
Fixed power, Mains power export and Peak shaving. In case the frequency or voltage drops or rises due to instability of the mains,
the curve for frequency- or voltage-dependent droop is made to compensate the power set point. The power set point will be
reduced with greater mains frequency or voltage and increased when the mains frequency or voltage is lower than specified.
Parameters for frequency- or voltage-dependent droop
Parameter
Default Description
7051, Contr. setting P
100 % of nominal
power
Fixed power set point.
Deadband low (7121)* 0.4 % Deadband low in percentages of nominal frequency/voltage.
Deadband high (7122)* 0.4 % Deadband high in percentages of nominal frequency/voltage.
Hysteresis low (7123)* 99.89 %
Hysteresis low in percentages of nominal frequency/voltage. If this is set
above deadband low, the hysteresis low is disabled.
Hysteresis high (7124)* 99.89 %
Hysteresis high in percentages of nominal frequency/voltage. If this is set
above deadband high, the hysteresis high is disabled.
P min (7131)* 24 kW** Minimum output of droop handling.
P max (7132)* 480 kW** Maximum output of droop handling.
Slope low (7133)* 96 kW/%**
Slope low. The setting determines the increase/decrease of power reference
per percentage the actual frequency drops below nominal frequency/voltage.
Slope high (7134)* -96 kW/%**
Slope high. The setting determines the increase/decrease of power reference
per percentage the actual frequency rises above nominal frequency/voltage.
Curve select (7141)* P(X1) The droop is based on the power set point.
DESIGNER'S HANDBOOK 4189341275A EN Page 135 of 196
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