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354
Monitoring of DC analog measurements
•
Remotely over the SPA port to the station monitoring system (SMS)
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The measuring range of different direct current measuring channels is settable by the
user independent on each other within the range between -25 mA and +25 mA in steps
of 0.01 mA. It is only necessary to select the upper operating limit I_Max higher than
the lower one I_Min.
The measuring channel can have a value of 2 of the whole range I_Max - I_Min above
the upper limit I_Max or below the lower limit I_Min, before an out-of-range error oc-
curs. This means that with a nominal range of 0-10 mA, no out-of-range event will oc-
cur with a value between -0.2 mA and 10.2 mA.
User can this way select for each measuring quantity on each monitored object of a
power system the most suitable measuring range and this way optimize a complete
functionality together with the characteristics of the used measuring transducer.
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The user can continuously monitor the measured quantity in each channel by means of
six built-in operating limits (figure 190). Two of them are defined by the operating
range selection: I_Max as the upper and I_Min as the lower operating limit. The other
four operating limits operate in two different modes:
•
Overfunction, when the measured current exceeds the HiWarn or HiAlarm pre-set
values
•
Underfunction, when the measured current decreases under the LowWarn or Low-
Alarm pre-set values
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