NOVAR 2100/2200 Operating Manual
4.5.5 Temperature
The temperature is measured with built in sensor and updated each approx. 10 seconds.
4.6 Measured Values Evaluation and Aggregation
As described above, measured values are evaluated according to IEC 61000-4-30 ed.2, based on
continuous (gap-less), 10 / 12 mains cycles long intervals ( measurement cycle ) processing.
Further aggregation of the actual values from this evaluation is used to obtain values for displaying
and recording.
4.6.1 Actual Values Evaluation and Aggregation
Actual ( instantaneous ) values of measured quantities, that can be viewed on instrument's display,
are evaluated each
display refresh cycl
e as average of integral number of measurement cycle values.
The display refresh cycle is preset to 3 measurement cycles , corresponding approx. to 0.6 sec
display refresh cycle duration.
Exceptions :
•
frequency – the value is refreshed each frequency measurement cycle (see above)
•
voltage and current harmonic components – the last measurement cycle values are
displayed (no averaging). Only odd harmonic components to 25
th
order are displayed. Higher
components are available via communication link only.
•
temperature – the value is refreshed each temperature measurement cycle (see above)
Actual values, read from an instrument via a communication link for monitoring purposes are
evaluated from one – the last – measurement cycle only.
4.6.2 Average Values Evaluation
From measurement cycle values, average values of all basic quantities are calculated. The averaging
period in range from 1 second to 1 hour can be used.
When
the floating window
averaging method is applied, an exponential function simulation is used to
get the thermal dependence. Unit step time response depends on the preset averaging period –
during this period, an average value reaches about 90 % of unit step amplitude.
The averaging period can be set in parameter group No. 77 independently for two groups of
quantities : so called
U/I
-group and
P/Q/S
-group. Following table lists processed quantities of both
groups.
Average Values Groups
Average values group
Averaged quantities
“ U / I ”
U
LL
, U
LN
, I, f, T
“ P / Q / S ”
P, Q, S, PF, Pfh, Qfh, cosφ
Preset averaging parameters noted above are valid for so called standard average values.
For the maximum power demand
ΣMD
in the Electricity Meter group, separate parameter is
used (see below).
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