MCS301 - 3ph meter Page 82 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
16 Power Quality measuring
The meter registers and provides below power quality information about:
•
Average Voltage
•
Under Voltage and Over Voltage (sags and swells)
•
Voltage Cut (Power outage)
•
Harmonics and THD
•
Unbalanced load
16.1 Average voltage measurement
The average voltage is determined in each phase. The average voltage values are stored in
the following COSEM objects:
•
Average voltage L1 (1-0:32.24.0.255);
•
Average voltage L2 (1-0:52.24.0.255);
•
Average voltage L3 (1-0:72.24.0.255);
The average voltage is determined according to the configurable aggregation time interval
between 1 min to 60 min. The default value is 10 minutes. At the start of aggregation interval,
the meter starts sampling phase voltage and averages them at the end of time interval.
The voltage level (measured average voltage level, ULX average with an interval of 10min
can be divided into two main groups as follow (based on definition in EN 50160).
U
LX
Normal
: During each period of one week (starting at Monday, 00:00) 95% of U
LX
average shall be within the range of U
N
+/-10% and all U
LX
average shall be within the
range of U
N
-15% to +10% (according EN50160).
U
LX
Bad
: Any other cases
In case of “U
LX
Bad” voltage, an event in the Power Quality event log will be generated
regarding each phase. The following events are considered:
•
Event Code 92: Bad Voltage Quality L1
•
Event Code 93: Bad Voltage Quality L2
•
Event Code 94: Bad Voltage Quality L3
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