Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 487
EN 61000-4-30 Metering and Aggregation Appendix I
Supply Voltage Swells
Voltage swells are detected for each voltage channel when the ½ cycle rms voltage
rises above the swell threshold. Swells are characterized by their threshold,
duration, and swell voltage.
• The power monitor uses a fixed swell threshold of 110% of nominal
system voltage for EN 61000-4-30 voltage swell detection.
• The duration of a swell begins when the ½ cycle rms voltage rises above the
swell threshold and ends when the rms voltage is equal to or less than the
swell threshold less the hysteresis voltage, which is fixed at 2% of nominal
system voltage. The measurement uncertainty of the duration cannot
exceed the length of one cycle.
• The swell voltage is the maximum rms voltage that is measured during the
event and its measurement uncertainty must not exceed ±0.2% of U
din
.
The start date/time, duration, and swell voltage of voltage swells are logged in the
Power Quality log and tracked in the EN 50160 yearly log and compliance
record. Time aggregation is not applicable to voltage swells.
Voltage Interruptions
Voltage interruptions are detected for each voltage channel when the ½ cycle rms
voltage on all voltage channels falls below the interruption threshold. Voltage
interruptions are characterized by their threshold and duration.
• The power monitor uses a fixed interruption threshold of 5% of nominal
system voltage for EN 61000-4-30 voltage dip detection.
• The duration of a dip begins when the ½ cycle rms voltage on all voltage
channels falls below the dip threshold and ends when any channel rms
voltage is equal to or greater than the interruption threshold plus the
hysteresis voltage, which is fixed at 2% of nominal system voltage.
If the power monitor has a separate source of control power, the start date/time
and duration voltage interruptions are logged in the Power Quality log and
tracked in the EN 50160 yearly log and compliance record. Time aggregation is
not applicable to voltage interruptions.
TIP You can also set up user-configurable sag and swell detection in the
PowerMonitor 5000 M6 and M8 models. See
Sag and Swell Detection on
page 102.
TIP EN 61000-4-30 also provides for a sliding reference voltage for sags and
swells. The PowerMonitor 5000 M6 and M8 models provide for sags and
swells in their setpoint functionality. See
Setpoints on page 191.
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