5-88
745 Transformer Management Relay
GE Multilin
5.7 S5 OUTPUTS
5 SETPOINTS
5
5.7S5 OUTPUTS
5.7.1 DESCRIPTION
The
S5 OUTPUTS
page contains the settings to configure all outputs. The 745 has nine digital outputs (one solid-state, four
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.
5.7.2 INTRODUCTION TO FLEXLOGIC™
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:
As mentioned above, the parameters of an equation can contain either INPUTS or GATES.
Table 5–11: FLEXLOGIC™ OUTPUT TYPES
NAME
TYPE
EQUATION PARAMETERS
EVALUATION RATE
Output Relay 1
solid-state
20
every 1/2 cycle*
Output Relays 2 to 5
trip-rated form A contacts
20 each
every 1/2 cycle*
Output Relays 6 to 8
form C contacts
20 each
every 100 ms
Self-Test Relay
form C contacts dedicated for
self-test (not programmable)
---
every 100 ms
Trace Trigger
waveform capture trigger
10
every 1/2 cycle*
Virtual Outputs
internal register
(for use in other equations)
10 each
every 1/2 cycle*
* cycle refers to the power system cycle as detected by the frequency circuitry of the 745.
Table 5–12: FLEXLOGIC™ INPUT TYPES
INPUTS
INPUT IS “1” (= ON) IF...
Element* pickup
The pickup setting of the element is exceeded
Element* operate
The pickup setting of the element is exceeded for the programmed time delay
Logic Inputs 1 to 16
The logic input contact is asserted
Virtual Inputs 1 to 16
The virtual input is asserted
Output Relays 1 to 8
The output relay operates
(i.e. evaluation of the FlexLogic™ equation results in a ‘1’)
Virtual Outputs 1 to 5
The virtual output operates
(i.e. evaluation of the FlexLogic™ equation results in a ‘1’)
Timers 1 to 10
The timer runs to completion
(i.e. the ‘start’ condition is met for the programmed time delay)
* element refers to any protection or monitoring element programmed under page
S4 ELEMENTS
.
