Kongsberg Maritime
POWER MANAGEMENT
Understanding the construction and operating
the Power Management
AIM2000 ver. 7.3.x
© KONGSBERG 1
06/01/09
Kongsberg Maritime
Power Management
Schematic overview of power production and distribution
Switch
Generator: symbol, text, instrument panel Board
load -
and
Bus tie
consumer
control
Emergency Heavy
generator consumers
- not - not
operational operational
© KONGSBERG 2
Generators load mode
Description in line 1 in the generator symbol
The generators operate in one of four modes:
• Manual: All operations are done by the operator
• Symmetric: Shares the load equally between the
generators
• Asymmetric: Shares the load unequally between the
generators. Main generator takes 80% of its maximum
load.
• Fix: Sets the load at the level shown when the
command is executed
06/01/09
Kongsberg Maritime
Generators control mode
The generators can be in standby or not-
standby mode
Not-standby generators are excluded from
the automatic operation sequence
controlled by the SVC
Standby generators are ready for
activating
All standby generators have a standby
number which determines the order of
automatic operation
The generators are started in ascending
order and stopped in descending order
© KONGSBERG 3
Description in line 3 in the generator symbol
Start/stop-sequences are shown
Typical states are CONNECTED, STOPPED,
REDUCE LOAD and STOPPING
Description in line 4 in the generator symbol
BLOCKED Must be reset to remove the block
INHIBIT Operations are inhibited because values are
missing or out of range
06/01/09
Kongsberg Maritime
The generator operation menu
Click on a button to operate
To set a generator in standby mode:
Enter a standby number in the dialog
box
© KONGSBERG 4
STOP The generator must be disconnected before stopping
START The generator must be disconnected before starting
DISCONNECT The generator must be disconnected before stopping
CONNECT The generator must be running before connection
STANDBY Sets the generator in standby mode.
A dialog box for entering a standby number appears.
NOT STBY Sets the generator in not-standby mode
INCREASE Incr the load in manual mode, setp in fixed load
DECREASE Decr the load in manual mode, setp in fixed load
MANUAL Selects the manual mode for the generator
FIX Selects the fixed load for the generator
SYMMETRIC Selects the symmetric load for the generator
ASYMMETRIC Selects the asymmetric load for the generator
RESET Resets a blocked generator
06/01/09
Kongsberg Maritime
Switch Board
The SB manages the distribution net and load
sharing
One SB can manage up to 4 generators
Several SB’s can be connected with bus tie
breakers
Several SB’s connected operate as one unit
Bustie
breaker
© KONGSBERG 5
The symbol consists of:
BUS TIE: A thick, green line below the generator symbol
INSTRUMENT PANEL: The panel shows current load,
available load and SB modes.
OPERATION MENU: Click the left mouse button when
pointing at the value of load or available load on the
instrument panel
POP UP MENU: Click the right mouse button when
pointing at the thick green line
06/01/09
Kongsberg Maritime
Load dependent start/stop
- One or more generators must be in standby mode
- Load dependent start/stop can be initiated when limits in kW or %
are reached (% in this example)
- Load dependent start/stop is delayed to prevent start/stop signals
on temporary variations
- Load dependent start can have two limits: one with low level and long
time and one with high value and short time.
Number of Start Start Stop
connected DDGs limit 1 Delay limit 2 Delay limit Delay
1 84% 30s 90% 10s - -
2 86% 30s 91% 10s 70% 15min
3 88% 30s 92% 10s 70% 15min
4 - - - - 70% 15min
© KONGSBERG 6
Example:
Each generator max load 2400 kW.
2 generators are running. At what load do one more generator start?
2 x 2400 kW x 86% = 4128 kW in more than 30 sec or
2 x 2400 kW x 91% = 4368 kW in more than 10 sec.
What is the load when one of the 3 running generators stop?
2 x 2400 kW x 70% = 3360 in more than 15 min
06/01/09
