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3.2.9
Power Factor
3.2.10 Miscellaneous Functions
3.2.11 Transformer Ratios
3–6
Courtesy of NationalSwitchgear.com
Power Factor
Power factor is calculated for each phase and for the total. With no input voltage or
current, power factor values are displayed as 0.00. Values are identified on the LCD as "PF
A", "PF B", "PF C", and "PF", with an appropriate indication for lagging (LAG) or leading (LEAD)
current with respect to voltage.
Average Power Factor
Average power factor is given for the previous demand interval (DmdAvg) and also for the
entire period since the last demand reset (Avg). The demand interval may be set as
described under Current Demand above. Values are identified on the LCD as "PF DmdAvg"
and "PF Avg".
Power Factor and Watts at Maximum Voltamperes
The power factor and real power demand that occurred at the same time as the maximum
recorded voltampere demand value since the last demand reset are displayed. Values are
identified on the LCD as "PF@VAPk" and "W@VAPk".
The number of times the demand values were reset since the last meter initialization is
identified on the LCD as "Dmd Reset". The time left in the present demand subinterval is
identified as "Dsub time". The number of power outages encountered since the last meter
initialization is identified as "Power Out".
The potential transformer (PT) and current transformer (CT) ratios are identified on the LCD
as "PTR" and "CTR", respectively.
CHAPTER 3: METERING
EPM 5100 ELECTRONIC POWER METER – USER GUIDE
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