Siemens SICAM Q80 Operating Instruction page 59

12.1.3 Data recording procedures
12.1.3.1 Overview
The following table pairs power network quality indicators with their respective data acquisition techniques.
Network quality and data
Attribute
Network frequency
Slow voltage variations
Fast voltage variations
Events (voltage sags and outages)
Harmonics voltage, interharmonics
Voltage asymmetry
Signal voltages
* The values indicated are default values and can be changed.
** U : Value of the r.m.s. voltage measured over 1 cycle, commencing at a fundamental zero crossing, and
rms1/2
refreshed each half cycle.
12.1.3.2 Mean values
Mean values can be used for long-term analysis of voltage, current and power. This includes upper harmonics and
symmetry.
The interval duration for forming the mean value (the time resolution) is adjustable. According to EN 50160, the
aggregation interval for most computations is 10 minutes.
12.1.3.3 Curve plots
Curve plots describe the course of a quantity over time, usually the course of the RMS-values of voltages or currents
with a resolution of 1/2 cycle.
Each data point in a curve plot consists of two values: the amplitude and the time (XY-waveform). This results in a
reduction of data volume, since only one point must be saved if the original signal changes substantially.
The desired accuracy must be entered as a parameter. The default value has been set to conform to EN 50160
standards for network power quality.
Events (such as voltage dips and power outages) are extrapolated from the curve plots after measurement. For this
reason, it is not yet necessary to set limit values when setting up measurement.
Acquisition procedure
add. in SICAM Q80
acc. EN 50160
7KG8080
histogram
mean value
mean values
curve plots
tables of curve
values
mean values
mean values
mean values curve plots
Power Quality Recorder SICAM Q80 7KG8080, Operating instruction
Computations
Resolution Curve type
data-reduced,
10 s *
normal
10 min normal
U **
data-reduced
rms1/2
U
rms1/2
10 min normal
10 min normal
10 /12 cycle,
data-reduced
10 min
E50417-B1074-C419-A2, Release 12.01.2015
E-59
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