GE UR Series Instruction Manual page 128
Line differential relay
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- Instruction manual (652 pages) ,
- Manual (433 pages) ,
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5.4 FLEXLOGIC™
Inspect each operator between the initial operands and final virtual outputs to determine if the output from the operator
is used as an input to more than one following operator. If so, the operator output must be assigned as a Virtual Output.
For the example shown above, the output of the AND gate is used as an input to both OR#1 and Timer 1, and must
therefore be made a Virtual Output and assigned the next available number (i.e. Virtual Output 3). The final output
must also be assigned to a Virtual Output as Virtual Output 4, which will be programmed in the contact output section
to operate relay H1 (i.e. Output Contact H1).
Therefore, the required logic can be implemented with two FlexLogic™ equations with outputs of Virtual Output 3 and
Virtual Output 4 as shown below.
VIRTUAL OUTPUT 1
State=ON
VIRTUAL OUTPUT 2
State=ON
VIRTUAL INPUT 1
State=ON
DIGITAL ELEMENT 1
State=Pickup
DIGITAL ELEMENT 2
State=Operated
CONTACT INPUT H1c
State=Closed
5
2.
Prepare a logic diagram for the equation to produce Virtual Output 3, as this output will be used as an operand in the
Virtual Output 4 equation (create the equation for every output that will be used as an operand first, so that when these
operands are required they will already have been evaluated and assigned to a specific Virtual Output). The logic for
Virtual Output 3 is shown below with the final output assigned.
3.
Prepare a logic diagram for Virtual Output 4, replacing the logic ahead of Virtual Output 3 with a symbol identified as
Virtual Output 3, as shown below.
5-44
Set
OR #1
Reset
XOR
Timer 1
Time Delay
AND
on Pickup
(800 ms)
VIRTUAL OUTPUT 3
Figure 5–9: LOGIC EXAMPLE WITH VIRTUAL OUTPUTS
DIGITAL ELEMENT 2
State=Operated
AND(2)
CONTACT INPUT H1c
State=Closed
Figure 5–10: LOGIC FOR VIRTUAL OUTPUT 3
L90 Line Differential Relay
LATCH
Timer 2
Time Delay
OR #2
on Dropout
(200 ms)
VIRTUAL OUTPUT 3
5 SETTINGS
VIRTUAL OUTPUT 4
827026A2.VSD
827027A2.VSD
GE Power Management
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