9440300990 23-3
DECS-250 Configuration
Sensing Transformer Ratings and Configuration
BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Sensing Transformers
HMI Navigation Path: Settings, System Parameters, Sensing Transformers
DECS-250 configuration includes entry of the primary and secondary values for the transformers that
supply generator and bus sensing values to the DECS-250. These configuration settings are illustrated in
Figure 23-3.
Generator PT
Voltage settings for the generator PT primary and secondary windings establish the nominal PT voltages
expected by the DECS-250. ABC or ACB phase rotation can be accommodated. Options for the
generator voltage sensing connections include single-phase (across phases C and A) and three-phase
sensing using three-wire connections.
Generator CTs
Current settings for the generator CT primary and secondary windings establish the nominal CT current
values expected by the DECS-250. DECS-250 sensing current can be obtained from a single phase or all
three generator phases.
Bus PT
Voltage settings for the bus PT primary and secondary windings establish the nominal bus PT voltages
expected by the DECS-250. Options for the bus voltage sensing connections include single-phase
(across phases A and C) and three-phase sensing using three-wire delta connections.
Figure 23-3. Sensing Transformer Ratings and Configuration
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