Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 467
IEEE 1159 Power Quality Event Classification Appendix G
Voltage and Current
Imbalance (Category 4.0)
The power monitor includes long-term voltage and current unbalance in its
metering results. The power monitor reports voltage and current imbalance as
power quality events.
Setup
Basic metering setup is required. These configuration parameters are found in the
Configuration.PowerQuality tab:
• IEEE1159_Imbalance_Averaging_Intvl_m - rolling average interval for
Imbalance, default 15 minutes
• IEEE1159_Voltage_Imbalance_Limit_% - percent of voltage imbalance
to report an event, default 3 per cent.
• IEEE1159_Current_Imbalance_Limit_% - percent of current imbalance
to report an event, default 25 per cent
Operation
The power monitor calculates voltage and current imbalance over a rolling
average with a configurable range of 15 minutes (default) to 60 minutes. The
rolling average is updated at a rate of 10 seconds per minute of the specified
interval.
When the rolling average value of voltage or current imbalance exceeds the
configured limit, an event is recorded in the power quality log.
Status
The Status.Alarms table provides the following tags for monitoring of unbalance
events:
• IEEE1159_Imbalance_Condition_Volts - 1 = unbalance is above the limit
• IEEE1159_Imbalance_Condition_Current - 1 = unbalance is above the
limit
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