CHAPTER 5: SETTINGS FLEXLOGIC
L90 LINE CURRENT DIFFERENTIAL SYSTEM – INSTRUCTION MANUAL 5-189
5
specified operators to create an output. The final output of an equation is a numbered register called a virtual output.
Virtual outputs can be used as an input operand in any equation, including the equation that generates the output, as a
seal-in or other type of feedback.
A FlexLogic equation consists of parameters that are either operands or operators. Operands have a logic state of 1 or 0.
Operators provide a defined function, such as an AND gate or a Timer. Each equation defines the combinations of
parameters to be used to set a Virtual Output flag. Evaluation of an equation results in either a 1 (=ON, or flag set) or 0
(=OFF, or flag not set). Each equation is evaluated at least four times every power system cycle.
Some types of operands are present in the relay in multiple instances, for example contact and remote inputs. These types
of operands are grouped together (for presentation purposes only) on the front panel display. The table lists characteristics
of the different types of operands.
Table 5-23: L90 FlexLogic operand types
The following table lists the operands available for the relay. The operands can be viewed online by entering the IP address
of the relay in a web browser and accessing the Device Information Menu.
Operand type State Example of format Characteristics
[Input Is ‘1’ (= ON) if...]
Contact Input On Cont Ip On Voltage is applied presently to the input (external contact
closed)
Off Cont Ip Off Voltage is not applied presently to the input (external
contact open)
Contact Output
(type Form-A contact
only)
Contact Closed Cont Op 1 Closed Contact output is closed
Current On Cont Op 1 Ion Current is flowing through the contact
Voltage On Cont Op 1 VOn Voltage exists across the contact
Voltage Off Cont Op 1 VOff Voltage does not exist across the contact
Direct Input On DIRECT INPUT 1 On The direct input is presently in the ON state
Element
(Analog)
Pickup PHASE TOC1 PKP The tested parameter is presently above the pickup setting
of an element that responds to rising values or below the
pickup setting of an element that responds to falling values
Dropout PHASE TOC1 DPO This operand is the logical inverse of the above PKP
operand
Operate PHASE TOC1 OP The tested parameter has been above/below the pickup
setting of the element for the programmed delay time, or
has been at logic 1 and is now at logic 0 but the reset timer
has not finished timing
Block PHASE TOC1 BLK The output of the comparator is set to the block function
Element
(Digital)
Pickup Dig Element 1 PKP The input operand is at logic 1
Dropout Dig Element 1 DPO This operand is the logical inverse of the above PKP
operand
Operate Dig Element 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
Element
(Digital Counter)
Higher than Counter 1 HI The number of pulses counted is above the set number
Equal to Counter 1 EQL The number of pulses counted is equal to the set number
Lower than Counter 1 LO The number of pulses counted is below the set number
Fixed On On Logic 1
Off Off Logic 0
RxGOOSE Boolean On RxGOOSE Boolean 1 On The RxGOOSE Boolean 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 set state (that is,
evaluation of the equation that produces this virtual output
results in a "1")
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