Maximum Demand (Md) Registers; Load Profile; Energy Snapshot Logging - Secure Liberty 100 Technical Reference Manual

a) Active Total Import (i.e. fundamental + harmonics)
b) Active Total Export
c) Reactive Import
d) Reactive Export
The meter maintains current and historical energy registers separately for each assigned energy type. The
cumulative value of each energy register is made available on the meter display as well as in meter reading
snapshots.
Note: Energy registers are configured at manufacture and cannot be reset locally or remotely.

5.2.2 Maximum Demand (MD) Registers

Liberty 100 calculates Maximum Demand (MD) for Active Import and Active Export (if configured) energies. The
MD value in the MD register is updated whenever the average demand over the programmed Maximum
Demand Integration Period (DIP) exceeds the currently stored MD value. The new MD value is recorded in the
meter along with the date and time of its occurrence. For example, if the currently stored MD value is 2 kW and
an average demand calculated over the next DIP is 3 kW then the new 3 kW MD value which is stored in the
MD register along with the DIP start time.
For this version of the software the default DIP is thirty (30) minutes with the MD register resetting automatically
on every billing action.
Note: Import MD register values are available on the meter display from Diagnostic mode and can also be
communicated locally or remotely.

5.2.3 Load Profile

Load Profile survey data comprises the energy consumption recorded by the meter at the end of fixed intervals
for a predefined number of days. Liberty 100 can be configured to store 395 days of half-hourly load profile data,
197 days of 15 minutes load profile data or 792 days of hourly load profile data for each energy channel on a
first-in-first-out (FIFO) roll over basis. The data is stored in non-volatile memory which can be read locally via
the '1107' port or sent to the HES on request via the Hub over GPRS.
The meter supports load survey logging for the following energy types:
a) Active Total Import (i.e. fundamental + harmonics)
b) Active Total Export
c) Reactive Import
d) Reactive Export
The meter will maintain the configured parameters with a resolution of 1 Wh/VArh with any residual fraction
being carried forward into the next period.
Note: Load survey data is not available on the meter display.

5.2.4 Energy Snapshot Logging

Liberty 100 logs the following four types of snapshots:
a) Midnight snapshot
b) Billing snapshot
c) Audit snapshot
d) Current snapshot (available only on request and not stored in the meter)
Page 26 of 116 Liberty 100 Smart Electricity Meter Technical Reference Manual BGX501-767-R02