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Power Meter
–
POM100
User Manual v1
www.compressedairalliance.com
51
Power, energy and power factor
Power and the PQ coordinate system
The meter uses the values of real power (P) and reactive power (Q) on the PQ
coordinate system to calculate apparent power
Power flow
Positive power flow P(+) and Q(+) means power is flowing from the power source
towards the load. Negative power flow P(-) and Q(-) means power is flowing from
the load towards the power source.
Energy delivered (imported) / energy received (exported)
The meter interprets energy delivered (imported) or received (exported) according
to the direction of real power (P) flow. Energy delivered (imported) means positive
real power flow (+P) and energy received (exported) means negative real power flow
(-P).
Power factor (PF)
Power factor (PF) is the ratio of real power (P) to apparent power (S), and is a
number between 0 and 1. An ideal, purely resistive load has no reactive
components, so its power factor is one (PF = 1, or unity power factor). A purely
inductive or capacitive load no resistive components, so its power factor is zero (PF
= 0).
True PF and displacement PF
The meter supports true power factor and displacement power factor values:
•
True power factor includes harmonic content (PF).
•
Displacement power factor only considers the fundamental frequency (DPF).
PF sign convention
The meter shows positive or negative power factor according to IEC standards.
PF sign in IEC mode
The meter correlates power factor sign (PF sign) with the direction of real power (P)
flow.
•
For positive real power (+P), the PF sign is positive (+).
•
For negative real power (-P), the PF sign is negative (-).
Summary of Contents for POM100
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