Rockwell Automation Publication 1426-UM001J-EN-P - August 2019 469
IEEE 1159 Power Quality Event Classification Appendix G
Status
These status bits annunciate over limit conditions and remain asserted until the
parameter is no longer over the threshold. A value of 1 indicates over limit. They
are found in the Status.Alarms tab.
• IEEE1159_DCOffset_Condition_V1
• IEEE1159_DCOffset_Condition_V2
• IEEE1159_DCOffset_Condition_V3
• IEEE1159_Voltage_THD_Condition_V1
• IEEE1159_Voltage_THD_Condition_V2
• IEEE1159_Voltage_THD_Condition_V3
• IEEE1159_Current_THD_Condition_ I1
• IEEE1159_Current_THD_Condition_ I2
• IEEE1159_Current_THD_Condition_ I3
• IEEE1159_Current_THD_Condition_ I4
• IEEE1159_Voltage_TID_Condition_V1
• IEEE1159_Voltage_TID_Condition_V2
• IEEE1159_Voltage_TID_Condition_V3
• IEEE1159_Current_TID_Condition_ I1
• IEEE1159_Current_TID_Condition_ I2
• IEEE1159_Current_TID_Condition_ I3
• IEEE1159_Current_TID_Condition_ I4
Related Functions
•Harmonic Analysis
• Power Quality Log
Flicker (Voltage
Fluctuations, Category 6.0)
Random or repetitive voltage fluctuations that typically do not exceed the normal
range of system voltage can be caused by the switching of large loads at random
times. The human effects of lamp flicker caused by such voltage fluctuations can
vary from annoyance to epileptic seizures in sensitive individuals. The flicker
severity index is proportional to the magnitude of voltage changes and, to a lesser
degree, the frequency at which they occur.
IEEE 1159 addresses the short-term flicker severity index P
st
. The power monitor
also calculates the long-term index, P
lt
.
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