402 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
PROTECTION FLEXLOGIC CHAPTER 7: PROTECTION
Figure 346: Shared operands configuration window
The left side of this screen displays all D90
Plus
operands that are available to the protection
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 clicking the
<< button.
Protection FlexLogic
The arrangement of internal digital logic in the D90
Plus
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 FlexLogic. In general, the system receives analog and digital inputs that it uses to
produce analog and digital outputs. The major sub-systems of a generic UR
Plus
-
series device involved in this process are shown here.
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