Woodward easYgen-3000, Installation Manual, Page: 43 / 67

Manual Manual 37223E 37223E easYgen-3000 easYgen-3000 Series Series (Package (Package P1) P1) - - Genset Genset Control Control
© © Woodward Woodward Page Page 43/67 43/67
Power M Power Measuring easuring
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
If the unit's current transformers are wired If the unit's current transformers are wired according to the diagram shown, the following values are displayed. according to the diagram shown, the following values are displayed.
Parameter Parameter Description Description Sign Sign displayed displayed
Generator Generator real real power power Genset Genset generating generating kW kW + + Positive Positive
Generator Generator real real power power Genset Genset in in reverse reverse power power - - Negative Negative
Generator power factor (cos φ) Generator power factor (cos φ) Inductive Inductive / / lagging lagging + + Positive Positive
Generator power factor (cos φ) Generator power factor (cos φ) Capacitive Capacitive / / leading leading - - Negative Negative
Mains Mains real real power power Plant Plant exporting exporting kW kW + + + + Positive Positive
Mains Mains real real power power Plant Plant importing importing kW kW - - - - Negative Negative
Mains power factor (cos φ) Mains power factor (cos φ) Inductive Inductive / / lagging lagging + + Positive Positive
Mains power factor (cos φ) Mains power factor (cos φ) Capacitive Capacitive / / leading leading - - Negative Negative
S1 (K) S1 (K)
S2 (L) S2 (L)
S2 (L) S2 (L)
S1 (K) S1 (K)
Real power Real power
display positive display positive
Reacitive power Reacitive power
display inductive display inductive
Real power Real power
display positive display positive
Reacitive power Reacitive power
display inductive display inductive
GC GCB B
generator circuit breaker generator circuit breaker
M MCB CB
mains circuit breaker mains circuit breaker
e e
a a
s s
Y Y
g g
e e
n n
6 6
5 5
s1 (k) s1 (k)
G G
s2 (l) s2 (l)
2 2
1 1
s1 (k) s1 (k)
s2 (l) s2 (l)
po pos s po pos s
GENERATOR GENERATOR
ind ind ind ind
Q Q Q Q
P P P P
po pos s po pos s
ind ind
Q Q Q Q
P P P P
BUSBAR BUSBAR
MAINS MAINS
Figure 6-37: Power measuring - directi Figure 6-37: Power measuring - directi on of power on of power
Power Factor Definition Power Factor Definition
≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡
The phasor diagram is used from the generator's view. Po The phasor diagram is used from the generator's view. Power factor is defined as follows. wer factor is defined as follows.
Power Factor is defined as a ratio of the real power to apparent power. In a purely resistive circuit, the voltage Power Factor is defined as a ratio of the real power to apparent power. In a purely resistive circuit, the voltage
and current waveforms are instep resulting in a ratio or power factor of 1.00 (often referred to as unity). In an in-
and current waveforms are instep resulting in a ratio or power factor of 1.00 (often referred to as unity). In an in-
ductive circuit the current lags behind the
ductive circuit the current lags behind the voltage waveform resulting in usable power (real power) and unusable voltage waveform resulting in usable power (real power) and unusable
power (reactive power). This results in a positive ratio or lagging power factor (i.e. power (reactive power). This results in a positive ratio or lagging power factor (i.e. 0.85lagging). In a capacitive 0.85lagging). In a capacitive
circuit the current waveform leads the voltage waveform resulting in usable power (real circuit the current waveform leads the voltage waveform resulting in usable power (real power) and unusable power) and unusable
power (reactive power). This results in a negative ratio or a leading power factor (i.e. power (reactive power). This results in a negative ratio or a leading power factor (i.e. 0.85leading). 0.85leading).
Inductive: Electrical load whose current waveform lags Inductive: Electrical load whose current waveform lags
the voltage waveform thus having a lagging power
the voltage waveform thus having a lagging power fac- fac-
tor. Some inductive loads such as electric tor. Some inductive loads such as electric motors have a motors have a
large startup current requirement resulting in l large startup current requirement resulting in lagging agging
Capacitive: Electrical load whose current waveform Capacitive: Electrical load whose current waveform
leads the voltage waveform thus having a
leads the voltage waveform thus having a leading power leading power
factor. Some capacitive loads such as capacitor b factor. Some capacitive loads such as capacitor banks anks
or buried cable result in leading power factors. or buried cable result in leading power factors.