Schneider Electric HRB1684301-01 Manual De Usuario

136

HRB1684301-01

Chapter 16—Power, energy and power factor

PowerLogic™ PM5500 series user manual

The meter interprets energy delivered or received according to the direction of real 
power (P) flow. 

Energy delivered means positive real power flow (+P) and energy received means 
negative real power flow (-P).

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).

The meter supports true power factor and displacement power factor values:

•

True power factor includes harmonic content.

•

Displacement power factor only considers the fundamental frequency.

The meter correlates leading power factor (PF lead) or lagging power factor (PF lag) 
with whether the current waveform is leading or lagging the voltage waveform. 

For purely resistive loads the current waveform is in phase with the voltage waveform. 
For capacitive loads, current leads voltage. For inductive loads, current lags voltage.

Quadrant 1

Positive (+)

Energy delivered

Quadrant 2

Negative (-)

Energy received

Quadrant 3

Negative (-)

Energy received

Quadrant 4

Positive (+)

Energy delivered

PF

P
S

---

=

270°

90°

270°

90°

90°

270°