InteliMains 210 Global Guide
87
As it is shown on both figures above, the additional gen-set is added once the actual load reserve is below the
level given by the appropriate setpoint of load reserve. The additional gen-set is removed once the actual load
reserve is above the level set by appropriate setpoint of load reserve.
The green dashed line depicts the value of load at which the additional gen-set is requested to start. This value
of the load value is linked with the setpoint
#Starting Rel Load Reserve 1 (page 194)
(or other selected reserve
set) in following way:
(100 % -
#Starting Rel Load Reserve 1 (page 194)
(or other selected reserve set)) * Sum of Nominal power =
Value of load when additional gen-set requested to start in kW (in % of nominal power), e.g.: (100 % – 35 %) *
700 kW = 455 kW (65 % of nominal power).
The red dashed line depicts the value of load at which the additional gen-set is requested to stop. This value of
the load value is linked with the setpoint
#Stopping Rel Load Reserve 1 (page 195)
(or other selected reserve set)
in following way:
(100 % -
#Stopping Rel Load Reserve 1 (page 195)
(or other selected reserve set)) * Sum of Nominal power =
Value of load when additional gen-set requested to stop in kW (in % of nominal power), e.g.: (100 % – 40 %) *
700 kW = 420 kW (60 % of nominal power).
There are 2 sets of setpoint for starting and stopping gen-sets in relative power management.
#Starting Rel Load Reserve 1 (page 194)
and
#Stopping Rel Load Reserve 1 (page 195)
#Starting Rel Load Reserve 2 (page 196)
and
#Stopping Rel Load Reserve 2 (page 197)
considered if binary
input
is activated
Note:
All controllers cooperating together in Power management must have the same load reserve set
selected.
Priority auto swap
There is also the option of automatic priority selection. The controllers are sharing data concerning the running
hours and all important information relevant to the actual load. Thanks to the Automatic priority swapping
function the controllers choose the gen-set(s) to be running with consideration of their running hours and the
actual load.
The running hours equalization function keeps a constant maximal difference of gen-set’s running hours. The
efficient function keeps running only the gen-sets with suitable nominal power to avoid inefficient fuel
consumption or gen-set overload.
Note:
The function sets the order of gen-sets by virtual values “engine priority”.
Run hours equalization
The gen-sets engine priorities are automatically swapped to balance engine running hours. In other words, the
controllers compare running hours of each gen-set and select gen-set(s) to run in order to maintain constant
maximal difference of running hours. Up to 32 controllers are supported. This function is activated via setpoint
#Priority Auto Swap (page 192)
= RUN HOURS.
The value of running hours which is used in run hours equalization is calculated by following formula:
RHE =
-
RHE is considered value for running hours equalization,
is a cumulative sum of run
hours available in statistic values of the controller,
is a setpoint. This setpoint may be
used in the case of gen-sets with different runs hours are intended to be set at the same initial point (e.g. a new
gen-set and a used gen-set after retrofit maintenance inspection).
