GE Multilin
C70 Capacitor Bank Protection and Control System
5-85
5 SETTINGS
5.5 FLEXLOGIC™
5
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 5–7: C70 FLEXLOGIC™ OPERAND TYPES
OPERAND TYPE
STATE
EXAMPLE FORMAT
CHARACTERISTICS
[INPUT IS ‘1’ (= ON) IF...]
Contact Input
On
Cont Ip On
Voltage is presently applied to the input (external contact
closed).
Off
Cont Ip Off
Voltage is presently not applied to the input (external
contact open).
Contact Output
(type Form-A contact
only)
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 exists 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 which responds to rising values or below the
pickup setting of an element which 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
Remote Input
On
REMOTE INPUT 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 set state (i.e.
evaluation of the equation which produces this virtual
output results in a "1").
Summary of Contents for UR Series C70
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