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Overvoltage of the Mains Voltage
•
The basic measurement of the RMS value V
V
(1/2) for each single measuring channel. The limiting value for overvoltages is a percentage value of
rms
Udin.
•
The factory setting of the hysteresis is 2 % of Udin. It can be set from 1 % to 6 %.
•
In multi-phase systems, all channels are independently synchronized in the zero point of the voltage.
•
In 1-phase systems, overvoltage begins when the voltage V
overvoltage. Overvoltage ends when the voltage V
minus the hysteresis.
•
In multi-phase systems, overvoltage begins when the voltage V
overvoltage in one or more channels. Overvoltage ends when the voltage V
value of the overvoltage minus the hysteresis in all measured channels.
•
The overvoltage threshold value and the hysteresis were parameterized according to the measuring task.
•
Overvoltage is characterized by the data pair Maximum value of overvoltage and duration (t):
The maximum value of an overvoltage is the highest voltage value of V
during overvoltage.
Voltage Interruption
•
In 1-phase systems, a voltage interruption begins when the voltage V
voltage interruption. The voltage interruption ends when the voltage V
of the voltage interruption plus the hysteresis.
•
In multi-phase systems, the voltage interruption begins when the voltages V
the voltage interruption in all channels. The voltage interruption ends when the voltage V
the threshold value of the voltage interruption plus the hysteresis in any of the measured channels.
•
The voltage interruption threshold value and the hysteresis are parameterized according to the measuring
task.
•
The factory setting of the hysteresis is 2 % of Udin. It can be set from 1 % to 6 %.
Unbalance of the Mains Voltage
•
The mains voltage unbalance is determined using the method of the symmetrical components. In case of
unbalance, the negative-sequence component U
component U
50-Hz distribution systems and over a 12-period time interval for 60-Hz distribution systems.
Harmonics of the Mains Voltage
•
interruption-free 10-/12-period measurement of a harmonics subgroup U
IEC 61000-4-7.
•
The total distortion is calculated as the subgroup total harmonic distortion (THDS) according to IEC 61000-
4-7.
•
Measurements are performed up to the 40th harmonics order.
SENTRON PAC5100/5200, 7KM5212/5412, Device Manual
E50417-H1040-C568-A1, Edition 03.2015
. The fundamental component of the voltage is measured over a 10-period time interval for
1
of overvoltage is the determination of the RMS value
rms
rises above the threshold of the
rms
falls below the threshold value of the overvoltage
rms
rises above the threshold of the
rms
rms
rms
rms
is determined in addition to the positive-sequence
2
4 Measurands and Recording
4.1 Measuring and Recording System
falls below the threshold
rms
which is measured in a channel
falls below the threshold of the
rises above the threshold value
fall below the threshold of
rms
rises above
rms
according to
sg,n
29
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