Siemens SENTRON PAC5200 - Page 27

4 Measurands and Recording
4.1 Measuring and Recording System
27SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
Flagging Concept
During conditions of undervoltage, overvoltage, or voltage interruption, the measurement method can return
implausible values for other measurands (for example, frequency measurement, voltage harmonics). The
flagging concept therefore prevents an individual event from being accounted for multiple times in different
measurands (for example, a single undervoltage event both as undervoltage and simultaneously as a
frequency change).
Flaggings are only triggered by undervoltage, overvoltage, and voltage interruptions. Undervoltage and
overvoltage detection is based on a threshold value selected by the user. This value determines whether data
are flagged.
The flagging concept is used when measuring the power frequency, mains voltage, mains voltage unbalance,
and harmonics of the mains voltage.
If a value was flagged within a given time interval, the aggregated value containing that value will be flagged,
too. Flagged values are stored and optionally integrated in the calculation or hidden.
Table 4-1 Overview of the Measurands to Determine the Power Quality
Measurand Method of
Measurement
Measurement Uncertainty and
Measuring Range
SENTRON
PAC5100/5200
Flagging
Power frequency Class A Class S
±50 mHz in the measuring ranges:
50 Hz: 42.5 Hz to 57.5 Hz
60 Hz: 51.0 Hz to 69.0 Hz
50 mHz
(see Table 4-17)
x
Mains voltage level Class A Class S
smaller than ±0.5 % Udin in the
range from 20 % Udin to 120 % Udin
0.2 % x
Undervoltages and
overvoltages of the mains
voltage,
Voltage interruptions
Class A Class S
±1.0 % of Udin, 1 period
0.2 % -
Unbalance of the mains
voltage
Class A Class S
U
2
and U
0
smaller than ±0.3 % in the
range
1 % to 5 % U
2
, U
1
0.2 % x
Harmonics of the mains
voltage
Class A Class S
Vm > 3 % Udin: ±5% V
m
Vm < 3 % Udin: ±0.15 % Udin
10 % to 100 % of the compatibility
levels of class 3 or IEC 61000-2-4
Measurement uncertainty:
Measuring range 200 %,
IEC 61000-4-7, Class 2
Condition:
V
m
 10 % V
rated
Maximum error:
±5 % V
m
-----------------------
Condition:
V
m
< 10 % V
rated
Maximum error:
±0.5 % V
rated
x
Flicker Class A Class S
IEC 61000-4-30:
Pst: ±10 %
Plt: ±10 %
Pinst: ±16 %
Pst: ±10 %
Plt: ±10 %
Pinst: ±16 %
-
Udin: Declared input voltage (The primary nominal voltage is used for it in the SENTRON PAC5100/5200. At use of a
voltage converter the primary nominal voltage and the secondary nominal voltage of the transducer are used.)
V
m
: Measured value
V
rated
: Rated voltage