ABB RELION 620 Series Technical Manual page 942

Section 8
Measurement functions
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Figure 490: Complex power and power quadrants
Table 891: Power quadrants
Quadrant Current
Q1 Lagging
Q2 Lagging
Q3 Leading
Q4 Leading
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 reactive
(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 defined maximum value, the counter value is
reset and restarted from 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 VArh
Initial and ER_RV_ACM to Reverse VArh Initial. It is also possible to reset the
accumulated energy to initial values through a parameter or with the RSTACM input.
P Q
+ +
- +
- -
+ -
1MRS757644 F
PF Power
0...+1.00 +ind
0...-1.00 -cap
0...-1.00 -ind
0...+1.00 +cap
620 series
Technical Manual