16 Power Quality measuring Page 85 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
16.5 Unbalanced load
Load Unbalance situation is the condition, when the current value in all phases is greater than a
minimum value (as precondition to start load unbalance detection process) and at least one
phase current deviates from average three phase current more than a defined threshold.
Figure 149: Load Unbalance Situation
I
Li
(that has been shown in Figure 22) is the last average value of phase Li that has been
captured by Average Values Profile COSEM object. The averaging period (to detect the
unbalancing situation) is same as capture period of Average Value Profile (default: 15 min).
Events for unbalance load are always generated at the end of aggregation period (capture
period of Average Values Profile), when meter stores average phase values in Average Values
Profile. At the same time also dedicated alarm is set or cleared. However if alarm bit is cleared
by the central system before meter detects normal condition (which can only happen at the end
of next aggregation period), alarm is immediately set back.
The min. current in phases (to start asymmetry detection) in (A) and threshold value for
asymmetry detection in (%) can be set in COSEM object “Unbalance Load Detection”:
•
Minimum Current (A);
•
Unbalance Threshold (%);
These parameters can be set remotely.
16.6 Voltage unbalance
Voltage unbalance situation is the condition, when the voltage value in all phases is greater
than the average value.
Events for voltage unbalance are always generated at the end of aggregation period (capture
period of Average Values Profile), when meter stores average phase values in Average Values
Profile. At the same time also dedicated alarm is set or cleared. However if alarm bit is cleared
by the central system before meter detects normal condition (which can only happen at the end
of next aggregation period), alarm is immediately set back.
These parameters for voltage unbalance can be set remotely.
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