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Supervision of AC input quantities (DA) Chapter 8
Monitoring
6 Supervision of AC input quantities (DA)
6.1 Application
Use the AC monitoring function to provide three phase or single phase values of voltage and
current. At three phase measurement, the values of apparent power, active power, reactive pow-
er, frequency and the RMS voltage and current for each phase are calculated. Also the average
values of currents and voltages are calculated.
6.2 Functionality
Alarm limits can be set and used as triggers, e.g. to generate trip signals.
The software functions to support presentation of measured values are always present in the ter-
minal. In order to retrieve actual values, however, the terminal must be equipped with the appro-
priate hardware measuring module(s), i.e. Transformer Input Module (TRM).
6.3 Function block
Table 116: AC monitoring function block types
Instance name
( DAnn- )
Function block name Description
DA01- DirAnalogIn_U1 Input voltage U1
DA02- DirAnalogIn_U2 Input voltage U2
DA03- DirAnalogIn_U3 Input voltage U3
DA04- DirAnalogIn_U4 Input voltage U4
DA05- DirAnalogIn_U5 Input voltage U5
DA06- DirAnalogIn_I1 Input current I1
DA07- DirAnalogIn_I2 Input current I2
DA08- DirAnalogIn_I3 Input current I3
DA09- DirAnalogIn_I4 Input current I4
DA10- DirAnalogIn_I5 Input current I5
DA11- DirAnalogIn_U Mean value U of the three phase to phase voltages
calculated from U1, U2 and U3
DAnn-
DirAnalogIN_yy
BLOCK HIALARM
HIWARN
LOWWARN
LOWALARM
en01000073.vsd
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