CHAPTER 6: SETPOINTS
S5 INPUTS/OUTPUTS
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–135
VI x NAME
Range: Select Alpha-Numeric Name
Default: Virtual IN x
VI x FUNCTION
Range: Disabled/Enabled
Default: Disabled
The Virtual Input is enabled and ready to be triggered when set to
Enabled
. All virtual
inputs will appear under the
S4 CONTROLS > SETPOINTS > S4 VIRTUAL INPUTS
menu.
VI x TYPE
Range: Self-Reset, Latched
Default: Self-reset
When the
Self-Reset
type is selected, the Virtual Input will be evaluated for one
protection pass only, upon “On” initiation and it will reset. When the
Latched
type is
selected, the virtual input will keep the state “On” until reset command “Off” is initiated.
NOTE
NOTE:
See also the Virtual Inputs section under
S4 CONTROLS
, on how to trigger a virtual input
signal state.
Virtual input programming begins with enabling the Virtual Input Function, and selecting
the Virtual Input Type
Self-Reset
or
Latched
under
SETPOINTS > S5 INPUTS/OUTPUTS >
VIRTUAL INPUTS
. Next, the user can assign a command
On/Off
to the enabled Virtual Input
under
SETPOINTS > S4 CONTROLS > S4 VIRTUAL INPUTS
. Referring to the Virtual Inputs logic
diagram below, a Virtual Input type can be selected to be either
Self-Reset
, or
Latched
.
When
Self-Reset
is selected and the “On” command is executed, the virtual input is
evaluated as a pulse at a rate of one protection pass. To prolong the time of the virtual
input pulse, one can assign it as a trigger source to a logic element with a dropout timer
set to the desired pulse time. Selecting the
Latched
type, will latch the virtual input state,
when the “On” command is executed.
NOTE
NOTE:
The "On" state of the Virtual Input will not be retained in the case of cycling of the relay
control power supply.
Figure 41: Virtual inputs scheme logic
SETPOINT
V INPUT FUNCTION
Disabled = 0
Enabled = 1
AND
SETPOINT
V INPUT 1 TYPE
Latched
Self-Reset
AND
AND
“Virtual Input 1 to ON = 1"
“Virtual Input 1 to OFF = 0"
S
R
LATCH
OR
ACTUAL VALUES
V INPUT 1 NAME:
(Operand)
V Input 1 Status
897774.cdr
From
Control
menu