CHAPTER 8: AUTOMATION AUTOMATION LOGIC
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 473
Figure 404: Shared operands configuration window
The left side of this screen displays all D90
Plus
operands that are available to the
automation function as shared operands. Select any operands from the other five primary
features by clicking the >> button. Operands can be de-assigned as shared operands by
pressing the << button.
Automation logic
The D90
Plus
internal digital logic combines fixed and user-programmable parameters. The
logic upon which individual features are designed is fixed, and all other logic, from digital
input signals through elements or combinations of elements to digital outputs, is variable.
The user has complete control of all variable logic through automation logic. In general, the
system receives digital inputs that it uses to produce digital outputs and analog inputs that
it uses to produce analog outputs. The figure shows the major sub-systems of a generic
UR
Plus
-series relay involved in this process.
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