GE D90 Plus - Protection Flexlogic Gates and Operators

CHAPTER 7: PROTECTION PROTECTION FLEXLOGIC
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL 405
Protection FlexLogic gates and operators
The table summarizes characteristics of logic gates used in protection FlexLogic equations.
Table 23: Protection FlexLogic gate characteristics
The following operators are available for use in protection FlexLogic equations.
Table 24: Protection FlexLogic operators
Element
(digital)
Pickup DIG ELEM 1 PKP The output operand is at logic 1
Dropout
DIG ELEM 1 DPO This operand is the logical inverse of the
pickup operand
Operate
DIG ELEM 1 OP The input operand has been at logic 1 for the
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
Fixed On
ON Logic 1
Off
OFF Logic 0
Remote
input
On
REMOTE IN 1 ON The remote input is presently in the on state
Virtual
input
On
VIRT IP 1 ON The virtual input is presently in the on state
Virtual
output
On
VIRT OP 1 ON The virtual output is presently in the on state
Type State Example Characteristics (input is logic 1 or “on” if...)
Gate Inputs Output is logic 1 if...
NOT 1 the input is logic 0
OR 2 to 16 any input is logic 1
AND 2 to 16 all inputs are logic 1
NOR 2 to 16 all inputs are logic 0
NAND 2 to 16 any input is logic 0
XOR 2 only one input is logic 1
Type Syntax Description Operation
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
shots
POSITIVE ONE
SHOT
One shot that corresponds to a
positive-going edge
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.
NEGATIVE ONE
SHOT
One shot that corresponds to a
negative-going edge
DUAL ONE SHOT One shot that responds to both the
positive and negative-going edges