GE G30 Instruction Manual page 269

5 SETTINGS
The logic that determines the interaction of inputs, elements, schemes and outputs is field programmable through the use
of logic equations that are sequentially processed. The use of virtual inputs and outputs in addition to hardware is available
internally and on the communication ports for other relays to use (distributed FlexLogic).
FlexLogic allows users to customize the relay through a series of equations that consist of operators and operands. The
operands are the states of inputs, elements, schemes and outputs. The operators are logic gates, timers and latches (with
set and reset inputs). A system of sequential operations allows any combination of specified operands to be assigned as
inputs to specified operators to create an output. The final output of an equation is a numbered register called a virtual out-
put. 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 parame-
ters to be used to set a Virtual Output flag. Evaluation of an equation results in either a 1 (=ON, i.e. flag set) or 0 (=OFF, i.e.
flag not set). Each equation is evaluated at least 4 times every power system cycle.
Some types of operands are present in the relay in multiple instances; e.g. contact and remote inputs. These types of oper-
ands are grouped together (for presentation purposes only) on the faceplate display. The characteristics of the different
types of operands are listed in the table below.
Table 5–16: G30 FLEXLOGIC OPERAND TYPES
OPERAND TYPE STATE
Contact Input On
Off
Contact Output Contact Closed
(type Form-A contact
Current On
only)
Voltage On
Voltage Off
Direct Input On
Element Pickup
(Analog)
Dropout
Operate
Block
Element Pickup
(Digital)
Dropout
Operate
Element Higher than
(Digital Counter)
Equal to
Lower than
Fixed On
Off
Remote Input On
Virtual Input On
Virtual Output On
GE Multilin
EXAMPLE FORMAT CHARACTERISTICS
[INPUT IS '1' (= ON) IF...]
Cont Ip On Voltage is presently applied to the input (external contact
closed)
Cont Ip Off Voltage is presently not applied to the input (external
contact open)
Cont Op 1 Closed Contact output is closed
Cont Op 1 Ion Current is flowing through the contact
Cont Op 1 VOn Voltage exists across the contact
Cont Op 1 VOff Voltage does not exists across the contact
DIRECT INPUT 1 On The direct input is presently in the ON state
PHASE TOC1 PKP The tested parameter is presently above the pickup setting
of an element which responds to rising values or below the
pickup setting of an element which responds to falling
values
PHASE TOC1 DPO This operand is the logical inverse of the above PKP
operand
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
PHASE TOC1 BLK The output of the comparator is set to the block function
Dig Element 1 PKP The input operand is at logic 1
Dig Element 1 DPO This operand is the logical inverse of the above PKP
operand
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
Counter 1 HI The number of pulses counted is above the set number
Counter 1 EQL The number of pulses counted is equal to the set number
Counter 1 LO The number of pulses counted is below the set number
On Logic 1
Off Logic 0
REMOTE INPUT 1 On The remote input is presently in the ON state
Virt Ip 1 On The virtual input is presently in the ON state
Virt Op 1 On The virtual output is presently in the set state (i.e.
evaluation of the equation which produces this virtual
output results in a "1")
G30 Generator Protection System
5.5 FLEXLOGIC
5
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