GE T35 Instruction Manual page 142

5.4 FLEXLOGIC™
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 5–6: T35 FLEXLOGIC™ OPERAND TYPES
OPERAND TYPE
Contact Input
5
Contact Output
(type Form-A contact
only)
Direct Input
Fixed
Remote Input
Virtual Input
Virtual Output
The operands available for this relay are listed alphabetically by types in the following table.
Table 5–7: T35 FLEXLOGIC™ OPERANDS (Sheet 1 of 4)
OPERAND TYPE OPERAND SYNTAX
CONTROL CONTROL PUSHBTN n ON
PUSHBUTTONS
DIRECT DEVICES DIRECT DEVICE 1On
DIRECT DEVICE 16On
DIRECT DEVICE 1Off
DIRECT DEVICE 16Off
DIRECT INPUT/ DIR IO CH1(2) CRC ALARM
OUTPUT
CHANNEL DIR IO CRC ALARM
MONITORING
DIR IO CH1(2) UNRET ALM
DIR IO UNRET ALM
ELEMENT: BKR ARC 1 OP
Breaker Arcing BKR ARC 2 OP
5-64
STATE EXAMPLE FORMAT
On Cont Ip On
Off Cont Ip Off
Voltage On Cont Op 1 VOn
Voltage Off Cont Op 1 VOff
Current On Cont Op 1 IOn
Current Off Cont Op 1 IOff
On DIRECT INPUT 1 On
On On
Off Off
On REMOTE INPUT 1 On
On Virt Ip 1 On
On Virt Op 1 On
↓
↓
T35 Transformer Management Relay
CHARACTERISTICS
[INPUT IS '1' (= ON) IF...]
Voltage is presently applied to the input (external contact
closed).
Voltage is presently not applied to the input (external
contact open).
Voltage exists across the contact.
Voltage does not exists across the contact.
Current is flowing through the contact.
Current is not flowing through the contact.
The direct input is presently in the ON state.
Logic 1
Logic 0
The remote input is presently in the ON state.
The virtual input is presently in the ON state.
The virtual output is presently in the set state (i.e.
evaluation of the equation which produces this virtual
output results in a "1").
OPERAND DESCRIPTION
Control Pushbutton n (n = 1 to 7) is being pressed.
Flag is set, logic=1
↓
Flag is set, logic=1
Flag is set, logic=1
↓
Flag is set, logic=1
The rate of Direct Input messages received on Channel 1(2) and failing the
CRC exceeded the user-specified level.
The rate of Direct Input messages failing the CRC exceeded the user-
specified level on Channel 1 or 2.
The rate of returned direct input/output messages on Channel 1(2) exceeded
the user-specified level (ring configurations only).
The rate of returned direct input/output messages exceeded the user-
specified level on Channel 1 or 2 (ring configurations only).
Breaker Arcing Current 1 has operated
Breaker Arcing Current 2 has operated
5 SETTINGS
GE Multilin