44
session is 5 KWH. The ATPOL II calculates KWH for each second, using every cycle during that time
for exact measurements.
The reactive energy consumed is determined the same as KWH except VAR measurements are used,
instead of watts.
The estimated energy consumed per hour is the total energy consumed, divided by the hours of
monitoring. For instance, if 5 KWH is consumed over a 10 minute period, then the estimated energy
consumed per hour is
./
.
60
5
30
10
est hr
KWH
KWH
.
The estimated energy consumed per year is the total energy consumed, divided by the fraction of a
year that monitoring has proceeded. For instance, if 5 KWH is consumed over a 10 minute period, then
the estimated energy consumed per year is
./
.
60 24 365
5
262,800
10
est
yr
KWH
KWH
(262.8
megawatt-hours).
The estimated energy consumed per month is the estimated energy consumed during a year, divided
by 12. For instance, if 5 KWH is consumed over a 10 minute period, then the estimated energy
consumed per month is
./
.
60 24 365
5
21,900
10 12
est mo
KWH
KWH
(21.9 megawatt-hours).
Energy Measurements in ATPOL II
ATPOL II performs all commonly desired energy measurements. When monitoring consumption, the
actual energy consumed is displayed by pressing [Energy]. Based on the history of consumption,
estimates of energy use per hour, energy use per month, and energy use per year are calculated each
second. These estimates are available by repeatedly pressing [More...]. In this way, by combining the
[Energy] and [More...] keys, there are 4 energy measurements available.
For instance, if the estimated energy use per year is desired, press: [Energy] (to display total energy
consumed), [More...] (to display KWH / hour), [More...] (to display KWH / month), and then [More...] (to
display KWH / year).
Energy Measurements in PSM
PSM presents all commonly desired energy measurements. When displaying a data log containing
power information, PSM will graph the energy consumed over any interval. The user can choose to
graph real energy use (KWH) or reactive energy use (KVARH).
Normally, a graph of energy usage will be a line that climbs up as it moves to the right. This is
because, as more and more power is used, the cumulative energy used increases.
In addition our Report Generator software will calculate actual energy used and the estimated energy
used pr month during any one or two intervals of time set by the user. If two time intervals are chosen,
it will report the percent change and the actual change in energy use between the two intervals. For
instance, if a comparison report is chosen and 5 KWH is consumed during the first interval of 10
minutes and 8 KWH is consumed during the second interval of 20 minutes, then the report would show:
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