Example
In the example illustrated below, it can be seen that the tie breaker will trip if DG1 or DG2 is connected to the
load, because they are smaller than 510 kW. If DG1 and DG2 are running together, the tie breaker will also
trip, because the total nominal power is still below 510 kW. If, however, DG3 is running alone or together with
one of the two smaller DGs, then the tie breaker will not trip, because the total nominal power will be higher
than 510 kW.
DG 3 = 600 kW
DG 2 = 250 kW
DG 1 = 250 kW
Tie breaker open point = 510 kW
Trip No trip
The powers mentioned above are nominal powers of the gensets in the application.
8.4.14 Power capacity
The power capacity setting in menu 8193 is used in AMF applications to determine how much power must be
available, before the tie breaker can close. When the gensets are started, the generator breakers will close,
and when sufficient power is available, the tie breaker will be closed.
Power capacity overrule:
In case some of the generators fail starting and the power capacity setpoint is not reached, the tie breaker will
never be closed. Because of this, it is possible to overrule the power capacity setpoint after a period of time
set in menu 8194. The function "power capacity overrule" is enabled in menu 8195.
8.4.15 Available power
The function is used to activate a relay when a specific amount of power is available. The purpose of this
function is to be able to connect load groups when the gensets of the emergency power plant are running.
Five levels of available power can be adjusted (menus 8220-8260):
● Available power 1
● Available power 2
● Available power 3
● Available power 4
● Available power 5
These setpoints can activate a relay when the specific amount of available power is reached. The relay out-
put can be used for connecting load groups when sufficient power is available. The relays will activate when
the available power is higher than the setpoint, but be aware that when the load groups are being connected,
the available power will decrease and the relay(s) deactivate again if the available power is below the set-
point. So it is necessary to make an external holding circuit.
The number of available relays is option-dependent.
AGC 100 Designer's Reference Handbook
4189340766 UK
Power management (AGC 14x only)
DEIF A/S Page 132 of 152
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