Formation Of Measured Quantities - Landis+Gyr E650 Series User Manual

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1.5.4

Formation of Measured Quantities

Active energy
© Landis+Gyr AG
Measured quantity
Apparent energy import
Apparent energy export
Phase voltages (RMS)
Phase currents (RMS)
Neutral current
Network frequency
Phase angle between voltages
Phase angle between voltage and
current
Power factor
Direction of rotating field
THD of active energy import
THD of active energy export
THD of active energy (percent)
THD of phase voltages (absolute) THD
THD of voltage (percent)
THD of phase currents (absolute) THD
THD of current (percent)
Line (copper) losses of active
energy
Transformer (iron) losses of active
energy
Voltage square hours
Ampere square hours
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.
D000030110 d – E650 Series 3 (ZMD400AT/CT, ZFD400AT/CT) – User Manual
ZMD300
ZMD400
+S (QI+QIV) Sum / Phases
-S (QII+QIII) Sum / Phases
U1, U2, U3
I1, I2, I3
I0 yes
fn yes
j U
U1-U2 / U1-U3* U12-U32 **
j U-I
U1-I1, U1-I2,
U1-I3 *
or
U1-I1, U2-I2,
U3-I3
PF Sum / Phases
yes
+THD Sum
A
-THD Sum
A
THD [%] Sum
A
Sum / Phases
U
THD [%] Sum
U
Sum / Phases
I
THD [%] Sum
I
OLA Sum
NLA Sum
2
U h Sum
2
I h Sum
Description of Unit
ZFD400
Sum
Sum
U12, U32
I1, I3
no
yes
U12-I1, U12-
I3 **
Sum
yes
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum
Sum