GE TRANSFORMER MANAGEMENT RELAY 745 Instruction Manual page 138

5.7 S5 OUTPUTS
5.7S5 OUTPUTS
The page contains the settings to configure all outputs. The 745 has nine digital outputs (one solid-state, four
S5 OUTPUTS
trip rated form A contacts, and four auxiliary form C contacts) which are fully programmable using FlexLogic™ equations.
FlexLogic™ is a highly flexible and easy-to-use equation format which allows any combination of protection and monitoring
elements, logic inputs, outputs, and timers to be assigned to any output, using multiple input AND, OR, NAND, NOR, XOR,
and NOT Boolean logic gates. Each digital output can have an equation of up to 20 parameters. Five "virtual outputs" are
also available, each having an equation containing up to 10 parameters, whose output can be used as a parameter in any
other equation.
In addition to these outputs, the conditions to trigger a waveform capture (trace memory) is also programmable using Flex-
Logic™. A 10 parameter equation is provided for this purpose.
A FlexLogic™ equation defines the combination of inputs and logic gates to operate an output. Each output has its own
equation, an equation being a linear array of parameters. Evaluation of an equation results in either a 1 (= ON, i.e. operate
the output), or 0 (= OFF, i.e. do not operate the output).
The table below provides information about FlexLogic™ equations for all outputs in the 745:
Table 5–11: FLEXLOGIC™ OUTPUT TYPES
NAME
Output Relay 1
Output Relays 2 to 5
5
Output Relays 6 to 8
Self-Test Relay
Trace Trigger
Virtual Outputs
* cycle refers to the power system cycle as detected by the frequency circuitry of the 745.
As mentioned above, the parameters of an equation can contain either INPUTS or GATES.
Table 5–12: FLEXLOGIC™ INPUT TYPES
INPUTS
Element* pickup
Element* operate
Logic Inputs 1 to 16
Virtual Inputs 1 to 16
Output Relays 1 to 8
Virtual Outputs 1 to 5
Timers 1 to 10
* element refers to any protection or monitoring element programmed under page
5-88
Courtesy of NationalSwitchgear.com
TYPE
solid-state
trip-rated form A contacts
form C contacts
form C contacts dedicated for
self-test (not programmable)
waveform capture trigger
internal register
(for use in other equations)
INPUT IS "1" (= ON) IF...
The pickup setting of the element is exceeded
The pickup setting of the element is exceeded for the programmed time delay
The logic input contact is asserted
The virtual input is asserted
The output relay operates
(i.e. evaluation of the FlexLogic™ equation results in a '1')
The virtual output operates
(i.e. evaluation of the FlexLogic™ equation results in a '1')
The timer runs to completion
(i.e. the 'start' condition is met for the programmed time delay)
745 Transformer Management Relay
5.7.2 INTRODUCTION TO FLEXLOGIC™
EQUATION PARAMETERS
20
20 each
20 each
---
10
10 each
.
S4 ELEMENTS
5 SETPOINTS
5.7.1 DESCRIPTION
EVALUATION RATE
every 1/2 cycle*
every 1/2 cycle*
every 100 ms
every 100 ms
every 1/2 cycle*
every 1/2 cycle*
GE Multilin