YOKOGAWA CW240, Руководство пользователя, Страница: 381 / 388

App.3-1
IM CW240E
Appendix
App
Appendix 3 Polarity
(Active Power, Reactive Power,
Power Factor, Phase Angle)
With the CW240, the polarity of the active power, the reactive power, the power
factor, and the phase angle are expressed through the voltage and current
phase as shown in the following diagram.
Phase
Difference
180 90 0 90
Lag Lead
180
Active Power – + + –
Reactive Power + + – –
Power Factor – + – +
Phase Angle – + – +
– –
+ +
– +
– +
+ –
– +
90 °
Reactive Power
0 ° 180 °
90 °
90 °
Active Power
0 ° 180 °
90 °
90 °
Power Factor/Phase Angle
0 ° 180 °
90 °
Lead
Lag
Lead
Lag
Lead
Lag
When active power is "+" : Energy is being supplied from the power supply
side to the load side. This is the normal status.
When active power is "–" : Indicates that energy is being supplied from the
load side to the power supply side, and
regenerative power is being generated.
When reactive power is "+" : Indicates that the current phase is lagging behind
the voltage phase. If the reactive power is large, it
is necessary to connect a phase-advanced
capacitor, etc., and improve the power factor.
When reactive power is "–" : Indicates that the current phase is leading the
voltage phase.