16 Power Quality measuring Page 84 of 142
MCS301 meter - product Manual 1.25 MetCom Solutions GmbH
Note: these COSEM objects are intended to provide over/under voltage information in local
reading. For details information of over/under voltages or to read from central system, the
related event log COSEM objects shall be considered.
At the starting of Over/Under voltage events, below parameters will be captured by the Power
Quality Event Log COSEM object (0-0:99.98.4.255):
•
Number of Over/Under Voltage;
•
Starting time of Over/Under Voltage;
At the end of Over/Under voltage the following events information will be stored in the
Power Quality Event Log:
•
End time of Over/Under Voltage;
•
Duration of Last Over/Under Voltage;
•
Magnitude of Last Over/Under Voltage;
16.3 Voltage Cut (power outage)
If the voltage drops below the "Threshold for Voltage Cut" and continues for the "Time
Threshold for Voltage Cut" seconds, the situation will be considered as Voltage Cut and an
event will be logged.
The threshold of voltage cut is adjustable and can be set by central system. The default value is
-50% Vref. The threshold value is stored in the following COSEM object and can be set/adjust
remotely by central system.
•
Threshold for Missing Voltage (Voltage Cut) (1-0:12.39.0.255);
As mentioned, the voltage cut will not be recorded unless it continues for equal or greater than
the specific time. Time threshold for voltage cut is between 1s to 30s and the default value is
30s. This time is adjustable and can be set via below parameter:
•
Time Threshold for Voltage Cut (1-0:12.45.0.255);
The voltage cut events are considered as Power Quality events and are captured by Power
Quality Event Log. The events codes 82, 83 and 84 are considered as starting of voltage cut in
phases L1, L2 and L3 respectively and events codes 223, 224 and 225 as end of voltage cut.
16.4 Harmonics / THD measuring
The MCS301 meter supports the harmonics and THD measurement (harmonics up to 15th and
THD up to the 32th in each phase for current and voltage). Below harmonics and THD values
are supported:
• Instantaneous THD for voltage and current per phase (up to the 32th)
• Instantaneous Harmonics for voltage and current per phase (up to the 15
th
)
• Average values for THD and harmonics
• Profile for harmonics and THD
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