9440300990 26-1
DECS-250 Testing
26 • Testing
Testing of the DECS-250’s regulation and optional power system stabilizer (style XPXXXXX) performance
is possible through the integrated analysis tools of BESTCOMSPlus
®
.
Real-Time Metering Analysis
BESTCOMSPlus Navigation Path: Metering Explorer, Analysis
HMI Navigation Path: Analysis functions are not available through front panel HMI.
Proper voltage regulator performance is critical to power system stabilizer performance. Step response
measurements of the voltage regulator should be performed to confirm the AVR gain and other critical
parameters. A transfer function measurement between terminal voltage reference and terminal voltage
should be performed with the machine operating at very low load. This test provides an indirect
measurement of the PSS phase requirement. As long as the machine is operating at very low load, the
terminal voltage modulation does not produce significant speed and power changes.
The BESTCOMSPlus Real-Time Metering Analysis screen can be used to perform and monitor on-line
AVR and PSS testing. Six plots of user-selected data can be generated and the logged data can be
stored in a file for later examination. BESTCOMSPlus must be in Live Mode in order to start plotting. Live
Mode is found under the Options menu on the lower menu bar. RTM Analysis screen controls and
indications are illustrated in Figure 26-1.
Figure 26-1. RTM Analysis Screen
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