ABB | SACE Emax 2
Specific applications | 2 - Load control159 | © 2017 ABB | 1SDH001330R0002 - ECN000058721 Rev. A
2 - Load control
General description
Load control is possible through the Ekip Power Controller, which is a new patented ABB function, available
only on SACE Emax 2 circuit-breakers equipped with any Ekip LCD or Touch (including Hi-, G, and G Hi- trip
units).
The purpose of the function is to to prevent a defined limit of power absorption from being exceeded in the
installation, through:
• The cumulative measurement of the energy consumed by the installation over time.
• An estimate of the energy consumed at the end of the monitoring periods in which the electrical energy
billing cycle is divided.
• Automatic load control, that is to say the temporary disconnection of lower priority loads if the estimate of
the energy exceeds the product of the power limit set and the duration of the monitoring periods.
• On the basis of the internal clock of the trip unit where the function resides or of an external synchronization
signal, the recognition of the starting instant of the monitoring periods, with reset and restart of the energy
counters at the beginning of every period.
NOTE: if the trip unit where the function resides is equipped with an Ekip Link module and
the clock and synchronization signals in accordance with the IEEE 1588 protocol are available
on the Link Bus, synchronization can be performed by the trip unit on the basis of this signal.
For details, see the chapter “14 - Ekip Link module".
This allows:
• To avoid exceeding contractual power limits with the electric energy distributor, and to provide for possible
peaks of consumption having to increase to the contractual power and the fixed costs to avoid incurring
penalties, and having to oversize the installation to avoid tripping of the overload protection.
• Intelligent real-time load management to handle the actual consumption requirements of the installation
moment by moment.
NOTE: load control based on measuring the energy rather than the instantaneous power
allows power peaks above the contractual limit to be tolerated if the duration of the peaks is
such that the average power during the monitoring period does not exceed the contractual
limit. This is useful, because billing and any penalties from the public utility company are
calculated on the basis of the average power measured in predefined time intervals, specifically
on the basis of the average highest power reached during the billing period.
Further information on the potential of the function is available in the White Paper 1SDC007410G0202 “Load
management with Ekip Power Controller for SACE Emax 2”.
Operating details
To enable the function, this just needs to be available on an Ekip LCD or Ekip Touch trip unit equipped with an
auxiliary power supply, and with the possibility to measure the total energy consumed (for example: installed
on the main circuit-breaker of the system). Therefore, the energy can be measured if the trip unit is equipped
with an Ekip Measuring module (see the chapter “3 - Ekip Measuring modules”).
NOTE: Ekip Measuring module is supplied as standard with Ekip Hi-, G, G Hi-Touch and Ekip
Hi-, G, G Hi-LCD trip units, whereas it has to be ordered in case an Ekip LCD or Touch are
used.
The circuit-breaker performing the function is indicated as the master, while the devices located upstream
the power supply circuits and controlled by the master are indicated as slaves.
The slaves can be real loads, or they can be generators. The generators are controlled in the opposite way
to loads, that is, they are connected in the event of high consumption (to activate additional energy sources)
and disconnected in the event of reduced consumption.
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