InteliMains 210 Global Guide
80
Case #1
This case is used in island operation.
Reserve Actual Reserve Start condition Stop condition
Absolute kW
ARstrt = ∑Pg
Nom
- ∑Pg
Act
ARstp = ∑Pg*
Nom
- ∑Pg
Act
ARstrt <
#LoadResStrt
ARstp >
#LoadResStop
Relative %
RRstrt = [(∑Pg
Nom
- ∑Pg
Act
) / ∑Pg
Nom
].100%
RRstp = [(∑Pg*
Nom
- ∑Pg
Act
) / ∑Pg*
Nom
].100%
RRstrt <
#%LdResStrt
RRstp >
#%LdResStop
Case #2
This case is used in parallel to mains operation.
Reserve Actual Reserve Start condition Stop condition
Absolute kW
ARstrt = ∑Pg
Nom
- BaseLoad
ARstp = ∑Pg*
Nom
- BaseLoad
ARstrt <
#LoadResStrt
ARstp >
#LoadResStop
Relative %
RRstrt = [(∑Pg
Nom
- BaseLoad) / ∑Pg
Nom
].100%
RRstp = [(∑Pg*
Nom
- BaseLoad) / ∑Pg*
Nom
].100%
RRstrt <
#%LdResStrt
RRstp >
#%LdResStop
List of abbreviations:
ARstrt .. Actual Absolute reserve in kW or kVA - for engine start calculation.
ARstp .. Actual Absolute reserves in kW or kVA - for engine stop calculation.
RRstrt .. Actual Relative reserve in % - for engine start calculation.
RRstp .. Actual Relative reserves in % - for engine stop calculation.
ΣPgNom .. Sum of Nominal power of all gen-sets on the bus.
ΣPg*Nom .. Sum of Nominal power of all gen-sets on the bus apart of the one, which is going to be stopped.
ΣPgAct .. Sum of Actual power of all gen-sets on the bus = system load.
BaseLd .. Baseload is given by the setpoint #System BaseLoad (page 171)
Note: System starting sequences may be very different due to their complexity (i.e. gen-sets which do not take
part in power management, various nominal powers etc.). Each system should be considered individually.
Starting sequence
As written above, the power management is based on the load evaluation in order to provide enough of available
running power. An additional gen-set starts when the load of the system raises above certain level to keep the
load reserve big enough. Following figure depicts the situation when an additional gen-set is requested to join
the already running gen-set(s) to the bus.
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