Power Factor Definition - Woodward easYgen-2000 Series User Manual

3.2.8

Power Factor Definition

Definition
Properties
Inductive
Load type Electrical load whose current waveform lags the
voltage waveform thus having a lagging power
factor. Some inductive loads such as electric motors
have a large startup current requirement resulting in
lagging power factors.
Different power factor i0.91 (inductive)
display on the unit
lg.91 (lagging)
Reactive power display 70 kvar (positive)
on the unit
Output of the interface + (positive)
Current relation to Lagging
voltage
Generator state Overexcited
Control signal If the control unit is equipped with a power factor controller while in parallel with the utility:
A voltage lower "-" signal is output as long as the
measured value is "more inductive" than the refer‐
ence setpoint
Example: measured = i0.91; setpoint = i0.95
37535B
Power Factor is defined as a ratio of the real power to apparent
power. In a purely resistive circuit, the voltage and current wave‐
forms are instep resulting in a ratio or power factor of 1.00 (often
referred to as unity).
In an inductive circuit the current lags behind the voltage waveform
resulting in usable power (real power) and unusable power (reac‐
tive power). This results in a positive ratio or lagging power factor
(i.e. 0.85lagging).
In a capacitive circuit the current waveform leads the voltage wave‐
form resulting in usable power (real power) and unusable power
(reactive power). This results in a negative ratio or a leading power
factor (i.e. 0.85leading).
easYgen-2200/2500 | Genset Control
Setup Connections > Power Factor Definition
Capacitive
Electrical load whose current waveform leads the
voltage waveform thus having a leading power
factor. Some capacitive loads such as capacitor
banks or buried cable result in leading power fac‐
tors.
c0.93 (capacitive)
ld.93 (leading)
-60 kvar (negative)
- (negative)
Leading
Underexcited
A voltage raise "+" signal is output as long as the
measured value is "more capacitive" than the refer‐
ence setpoint
Example: measured = c0.91; setpoint = c0.95
Installation
67