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CHAPTER 3: METERING
EPM 5100 ELECTRONIC POWER METER – USER GUIDE
3–5
3.2.5
Apparent Power
Voltamperes are calculated for each phase according to the following formula:
(EQ 3.1)
For total VA, the displayed “W” is equal to “W A” + “W B” + “W C” and the displayed “Var” is
equal to “Var A” + “Var B” + “Var C”. Values are identified on the LCD as “VA A”, “VA B”, “VA C”,
and “VA”.
3.2.6
Energy
Energy is the summation of power over time and is provided as watthours,
voltamperehours, Q-hours and lagging and leading varhours. The values are reset
manually in Program mode or automatically when the maximum value that can be
displayed on the LCD is exceeded. Values are identified on the LCD as Wh, VAh, Qh, +Varh
(lagging), and -Varh (leading).
3.2.7
Frequency
The frequency calculated by the EPM 5100 is identified on the LCD as Hertz.
3.2.8
Demand
Current Demand (Present Ampere Demand)
Current demand is the average rms current metered over the previous demand interval.
The demand interval may be set to 15, 20, 30, or 60 minutes, with rolling demand
subintervals of 5, 10, 15, 20, and 30 minutes (depending on the main interval length).
Values are identified on the LCD as “A ADmd”, “A BDmd”, and “A CDmd”.
Peak Current Demand (Maximum Ampere Demand)
Peak current is the maximum current demand recorded since the demand values were last
reset. Values are identified on the LCD as “A APk”, “A BPk”, and “A CPk”.
Present Power Demand
Present power demand is given as watts, voltamperes, and lagging (+) and leading (–) vars
metered over the most recently completed demand interval. The demand interval may be
set as described under
Current Demand
above. Values are identified on the LCD as “W
Dmd”, “VA Dmd”, “+VarDmd”, and “–VarDmd”.
Peak Power Demand
Peak power is given as the maximum watts, voltamperes, and lagging (+) and leading (–)
vars demands recorded since the demand values were last reset. Values are identified on
the LCD as “W Peak”, “VA Pk”, “+Var Pk”, and “–Var Pk”.
Apparent power (VA)
Real Power
(
)
2
Reactive Power
(
)
2
+
=
Содержание EPM 5100
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