NOVAR 2100/2200 Operating Manual
4.6.3 Embedded Electricity Meter
For electric energy measurement, stand-alone unit –
electricity meter
- is implemented inside
instruments. Energies are evaluated in compliance of the IEC 62053-24 standard : active energy from
full harmonic spectrum and reactive energy from the fundamental harmonic component only.
Except of electric energy, maximum active power demand
Σ
MD is registered in the unit.
4.6.3.1 Electric Energy Processing
Measured values of both active and reactive electrical energies are recorded separately in four
quadrants. Following energy counters can be displayed :
•
active energy consumed (
E
P+
, import), active energy supplied (
E
P-
, export)
•
reactive energy :
either
•
reactive energy consumed (
E
QL
, inductive), reactive energy supplied (
E
QC
,
capacitive)
or
•
reactive energy registered at the three-phase active energy being consumed
(imported) : inductive (
E
QL+
) and capacitive (
E
QC+
) energy
•
reactive energy registered at the three-phase active energy being supplied
(exported) : inductive (
E
QL-
) and capacitive (
E
QC-
) energy
Desired presentation format can be set with parameter 78.
Internal energy counters have sufficient capacity in order not to overflow during the whole instrument
lifetime. On the instrument's display only 9 digits can be viewed – therefore, after energy value
exceeds 99999999.9 kWh/kvarh, instrument's display format automatically switches to MWh/Mvarh,
then to Gwh/Gvarh.
4.6.3.2 Maximum Demand Registration
From the instantaneous measured value of active power the instrument evaluates its average value
per preset period using preset averaging method. In the electricity meter unit, such quantitiy is called
actual demand
(
ΣAD
). Note that the actual demand is processed individually and its averaging period
is presetable independently on standard average values (
ΣP
AVG
).
Its maximum value reached since the last clearing is called
maximum demand
(
ΣMD
).
The ΣAD value is not displayed on the instrument display – only their registered three-phase
maximum
ΣMD
is.
The maximum can be cleared independently of standard average maximums/minimums.
4.7 Special PFC-Block Related Quantities' Meaning
& Method of Evaluation
General quantities' meaning and evaluation formulas can be found in the previous chapter. For the
PFC-block operation, some additional special quantities are necessary. Description of the quantities
follows.
4.7.1 Values Used for Power Factor Control Evaluation and
Aggregation
Powers Pfh and Qfh are basic quantities used for power factor control. Values of the quantities are
evaluated each measurement cycle. Then they are internally
averaged with floating 5 seconds long
60
