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Description of Unit
Mean value formation
1.5.3
Measured Quantities
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
U1
U2
U3
1
2
3
Fig. 1.8
Time measurement
The phase angle between voltage and current is determined by the times
between zero passage of the phase voltage U1 and those of the phase cur-
rents I1, I2 and I3.
For further processing of the individual signal the signal processor gener-
ates mean values over one second, which the following microprocessor
scans at intervals of one second.
Measured quantity
Active energy in quadrant I
Active energy in quadrant II
Active energy in quadrant III
Active energy in quadrant IV
Active energy import
Active energy export
Active energy, absolute value
Active energy, absolute value
Active energy import summation
Acitve energy export summation
Reactive energy in quadrant I
Reactive energy in quadrant II
Reactive energy in quadrant III
Reactive energy in quadrant IV
Reactive energy import
Reactive energy export
Reactive energy import
Reactive energy export
Reactive energy, combined
Reactive energy, combined
Reactive energy, absolute value
Reactive energy, absolute value
Reactive energy import
summation
Reacitve energy export
summation
Time measurement
for rotating field,
frequency, phase angle
1 : T
U1-U2
2 : T
U1-U3
3 : T
(fn)
U1-U1
ZMD300
ZMD400
A (QI)
Sum / Phases
A (QII)
Sum / Phases
A (QIII)
Sum / Phases
A (QIV)
Sum / Phases
+A (QI+QIV)
Sum / Phases
–A (QII+QIII)
Sum / Phases
Sum / Phases
+A
+
-A
Sum / Phases
+A
-
-A
Σ +A
Sum
Σ -A
Sum
R (QI)
Sum / Phases
R (QII)
Sum / Phases
R (QIII)
Sum / Phases
R (QIV)
Sum / Phases
+R (QI+QII)
Sum / Phases
–R (QIII+QIV)
Sum / Phases
+R (QI+QIV)
Sum / Phases
–R (QII+QIII)
Sum / Phases
R (QI+QIII)
Sum / Phases
R (QII+QIV)
Sum / Phases
Sum / Phases
+R
+
-R
Sum / Phases
+R
-
-R
Σ +R
Sum
Σ -R
Sum
15/93
ZFD400
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
© Landis+Gyr AG
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