Automation Logic - GE D90 Plus Instruction Manual

Line distance protection system

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CHAPTER 8: AUTOMATION

Automation logic

LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL

Figure 404: Shared operands configuration window

The left side of this screen displays all D90

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.

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

-series relay involved in this process.

operands that are available to the

AUTOMATION LOGIC