Protection Flexlogic Gates And Operators - GE D90 Plus Instruction Manual

CHAPTER 7: PROTECTION

Protection FlexLogic gates and operators

PLUS
D90 LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
Type State
Element Pickup
(digital)
Dropout
Operate
Fixed On
Off
Remote On
input
Virtual On
input
Virtual On
output
The table summarizes characteristics of logic gates used in protection FlexLogic equations.
Table 23: Protection FlexLogic gate characteristics
Gate Inputs
NOT 1
OR 2 to 16
AND 2 to 16
NOR 2 to 16
NAND 2 to 16
XOR 2
The following operators are available for use in protection FlexLogic equations.
Table 24: Protection FlexLogic operators
Type Syntax Description
Editor INSERT Insert a parameter in the equation
list
DELETE Delete a parameter from an
equation list
End END The first END operator signifies the
last entry in the FlexLogic equation
One POSITIVE ONE One shot that corresponds to a
shots SHOT positive-going edge
NEGATIVE ONE One shot that corresponds to a
SHOT negative-going edge
DUAL ONE SHOT One shot that responds to both the
positive and negative-going edges
Example Characteristics (input is logic 1 or "on" if...)
The output operand is at logic 1
DIG ELEM 1 PKP
This operand is the logical inverse of the
DIG ELEM 1 DPO
pickup operand
The input operand has been at logic 1 for the
DIG ELEM 1 OP
programmed pickup delay time, or has been
at logic 1 for this period and is now at logic 0
but the reset timer has not finished timing
Logic 1
ON
Logic 0
OFF
The remote input is presently in the on state
REMOTE IN 1 ON
The virtual input is presently in the on state
VIRT IP 1 ON
The virtual output is presently in the on state
VIRT OP 1 ON
Output is logic 1 if...
the input is logic 0
any input is logic 1
all inputs are logic 1
all inputs are logic 0
any input is logic 0
only one input is logic 1
PROTECTION FLEXLOGIC
Operation
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A one shot refers to a single input
gate that generates a pulse in
response to an edge on the input.
The output from a one shot is true
(positive) for only one pass through
the FlexLogic equation. There are a
maximum of 64 one shots.
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