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Device description
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D000062026 en a
– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
© Gyr
Measured quantity
ZMD400
ZFD400
Apparent energy import
+S (QI+QIV)
Sum / Phases
Sum
Apparent energy export
-S (QII+QIII)
Sum / Phases
Sum
Phase voltages (RMS)
U1, U2, U3
U12, U32
Phase currents (RMS)
I1, I2, I3
I1, I3
Neutral current
I0
yes
no
Network frequency
f
n
yes
yes
Active power
±P
Sum / Phases
Sum
Reactive power
±Q
Sum / Phases
Sum
Phase angle between voltages
j
U
U1-U2 / U1-U3* no
Phase angle between voltage and
current
j
U-I
U1-I1, U1-I2,
U1-I3 *
or
U1-I1, U2-I2,
U3-I3
no
Power factor
PF
Sum / Phases
Sum
Direction of rotating field
yes
yes
TTHD of active power
TTHD
A
[0;1]
Sum
Sum
TTHD of phase voltage
TTHD
V
[0:1]
Phase 1, 2, 3
Phase 1, 3
TTHD of phase current
TTHD
I
[0:1]
Phase 1, 2, 3
Phase 1, 3
TTHD of voltage
TTHD
V
[0:1]
Sum
Sum
TTHD of current
TTHD
I
[0:1]
Sum
Sum
Line (copper) losses of active
energy
OLA
Sum
no
Transformer (iron) losses of active
energy
NLA
Sum
no
Signed line (copper) losses of
active energy **
±OLA
Sum
no
Signed transformer (iron) losses of
active energy **
±NLA
Sum
no
Voltage square hours
U
2
h
Sum
Sum
Ampere square hours
I
2
h
Sum
Sum
* Only if U1 is present.
** OLA/NLA not accessible, if ±OLA/±NLA selected.
2.6.4
Formation of measured quantities
By scanning the mean values of active power P, and in combimeters also
reactive power Q every second, energy components are produced (Ws or
vars) at fixed intervals (every second) and with varying energy magnitudes
or demand. These energy components are scaled by the microprocessor
corresponding to the meter constant and are then available as measured
quantities for selection of the measured values. The measured values are
fed directly to the following registers to record the energy and the maximum
demand (in combimeters also of minimum power factor).
The active energy in the individual phases ±A1, ±A2 and ±A3 are formed
directly from the mean values of active power P1, P2 and P3.
Active energy