Supervision Of Ac Input Quantities (Da); Application; Functionality; Function Block - ABB REL 501-C1 2.5 Technical Reference Manual

4
4.1
4.2
4.3

Supervision of AC input quantities (DA)

Supervision of AC input quantities (DA)

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.

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).

Function block

DAnn-
DirAnalogIN_yy
BLOCK HIALARM
HIWARN
LOWWARN
LOWALARM
en01000073.vsd
Table 171: AC monitoring function block types
Instance name Function block name
( DAnn- )
DA01- DirAnalogIn_U1
DA02- DirAnalogIn_U2
DA03- DirAnalogIn_U3
DA04- DirAnalogIn_U4
DA05- DirAnalogIn_U5
DA06- DirAnalogIn_I1
DA07- DirAnalogIn_I2
DA08- DirAnalogIn_I3
DA09- DirAnalogIn_I4
DA10- DirAnalogIn_I5
DA11- DirAnalogIn_U
Description
Input voltage U1
Input voltage U2
Input voltage U3
Input voltage U4
Input voltage U5
Input current I1
Input current I2
Input current I3
Input current I4
Input current I5
Mean value U of the three phase to phase voltages
calculated from U1, U2 and U3
Chapter 11
Monitoring
171