Siemens SIMEAS Q80 Operating Instruction page 126

E-50 SIMEAS Q80 7KG8080
11.1.2.2.3 Analysis
n
= Line number 1...4
U
= Voltage n, RMS-value
n
u
= Voltage n, instantaneous value
n
I
= Current n, RMS-value
n
i
= Current n, instantaneous value
n
11.1.2.3 Circuiting and computation methods
The validity of the measurement results is defined by the consumer system (see adjacent image).
I
S
The correct rotation direction is assumed. The phasing is indicated by the complex representation of voltage (pointer
diagram) in the adjacent figure.
L1
U
L3
Note
Power Quality Recorder SIMEAS Q80 7KG8080, Operating instruction
E50417-B1074-C419-A2, Release 09.02.2011
Z
N
23
L2
· If the rotation direction is reversed, a message is posted on the PC-monitor. SIMEAS Q80
7KG8080 interprets the reversed phasing as asymmetry.
· For analysis of a three-phase current system, the measurement terminals U1.. U3 and I1.. I3
are provided. The measurement terminals U4 and I4 are free extra inputs and can be used,
for example, to monitor the N line.
· For 1-phase measurements, all measurement inputs U1.. U4 and I1.. I4 can be used, where
U1 must always be used.
· With SIMEAS Q80 7KG8080 - 1, U5 through U8 behave analogously to U1 through U4.
S
= Apparent power n from voltage n and current n
n
P
= Active power n from voltage n and current n
n
Q
= Reactive power n from voltage n and current n
n
LF
= Power factor n
n
S
= Total apparent power (system apparent power)
S
P
= Total active power
S
Q
= Total reactive power
S
LF
= Total power factor
S