Landis+Gyr E650 Series User Manual page 19

Device description
Apparent energy
Calculation method 1
(vectorial addition)
D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual
The microprocessor can allocate the reactive energy to the 4 quadrants in
the combi-meters from the signs of R and A:

Reactive energy in 1st quadrant: +Ri

Reactive energy in 2nd quadrant: +Rc

Reactive energy in 3rd quadrant: –Ri

Reactive energy in 4th quadrant: –Rc
In the same way, it can allocate the reactive energy of the individual phases
to the 4 quadrants.
+ kvarh
+Rc
Quadrant II
Export -A
- kWh Quadrant III
- kvarh
Figure 10. 4-quadrant measurement
The quadrants are numbered from top right as 1st quadrant (+A/+Ri) anti-
clockwise to the 4th quadrant (+A/–Rc) at bottom right.
The apparent energy is calculated in the combi-meters in two ways:

By vectorial addition of the active and reactive energy of the individual
phases

By multiplying the rms values of voltage and current of the individual
phases
The method of calculation can be parameterised (only one possible in each
case).
From the mean values A1, A2 and A3 and R1, R2 and R3 the
microprocessor calculates the apparent energy of the individual phases
±S1, ±S2 and ±S3 as well as the total apparent energy ±S.
Mean values
per second
±A 1


±A 2
±A 3
± R1

±R 2
±R 3
Figure 11. Total apparent energy according to calculation method 1
+R
+Ri
Quadrant I
Quadrant IV
-Ri -Rc
-R
2
(A1 + A2 + A3) + (R1 + R2 + R3)
+ kvarh
+A Import
+ kWh
- kvarh
Measured quantities
+S (Import)
2
-S (Export)
© Landis+Gyr
19/84