Section 7 1MAC309294-MB F
Measurement functions
390 RER620
Technical Manual
Figure 209: Complex power and power quadrants
Table 340: Power quadrants
The active power P direction can be selected between forward and reverse with Active
power Dir and correspondingly the reactive power Q direction can be selected with
Reactive power Dir. This affects also the accumulated energy directions.
The accumulated energy is calculated separately as forward active (EA_FWD_ACM),
reverse active (EA_RV_ACM), forward reactive (ER_FWD_ACM) and reverse active
(ER_RV_ACM). Depending on the value of the unit multiplier selected with Energy unit
Mult, the calculated power values are presented in units of kWh/kVArh or in units of
MWh/MVArh.
When the energy counter reaches its maximum value defined, the counter value is reset
and restarted from the zero. Changing the value of the Energy unit Mult setting resets the
accumulated energy values to the initial values, that is, EA_FWD_ACM to Forward Wh
Initial, EA_RV_ACM to Reverse Wh Initial, ER_FWD_ACM to Forward WArh Initial and
ER_RV_ACM to Reverse WArh Initial. It is also possible to reset the accumulated energy
to initial values through a parameter or with the RSTACM input.
Sequence components
The phase-sequence current components are calculated from the phase currents according
to:
Quadrant Current P Q PF Power
Q1 Lagging + + 0…+1.00 +ind
Q2 Lagging - + 0…-1.00 -cap
Q3 Leading - - 0…-1.00 -ind
Q4 Leading + - 0…+1.00 +cap
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