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S4 CONTROLS
Virtual inputs
Logic elements
6–118
There are 32 virtual inputs that can be individually programmed to respond to input
commands entered via the relay keypad, or by using communication protocols.
PATH:
SETPOINTS > S4 CONTROLS > VIRTUAL INPUTS
VIRTUAL INPUT 1
Range: Off, On
Default: Off
The state of each virtual input can be controlled under
menu. For this purpose, each of the virtual inputs selected for control need be
INPUTS
"Enabled" under
SETPOINTS > S5 INPUTS/OUTPUTS > VIRTUAL INPUTS
Reset" or "Latched" specified.
If Self-Reset type was selected, entering "On" command will lead to a pulse 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. If "Latched"
type is selected, the state of the virtual input will be latched, upon entering "On" command.
Refer to the logic diagram in the
details.
The 350 relay has 16 Logic Elements available to build simple logic using the state of any
programmed contact, virtual, or remote input, or from the output operand of a protection,
or control element. Changing the state of any of the assigned inputs used as trigger
sources, will change the state of the Logic Element, unless a blocking input is present. The
logic provides for assigning up to eight triggering inputs in a programmable gate for Logic
Element operation, and up to four blocking inputs in a programmable gate for defining the
block signal. Pickup and dropout timers are available for delaying Logic Element operation
and drop-out respectively. In addition, the user can define whether to use the "ON", or
"OFF" state of the programmed element by selecting ASSERTED: "On" or "Off".
Referring to the Logic Element logic diagram below, the Logic Element can be set to one of
four functions: Control, Alarm, Latched Alarm, or Trip. When Alarm or Latched Alarm is
selected, the output relay #1 (Trip) is not triggered during Logic Element operation. The Trip
output relay will be triggered when Trip is selected as the function, and the Logic Element
operates. The Logic Element function can be also selected as Control, and used with other
relay elements without turning on the "ALARM" and "TRIP" LEDs.
The "PICKUP" LED will turn on upon a Logic Element pickup condition except when the
Logic Element function is selected as Control.
The "ALARM" LED will turn on upon Logic Element operation if the Logic Element function
selected is either Alarm, or Latched Alarm.
The "TRIP" LED will turn on upon Logic Element operation if the Logic Element function is
selected as Trip.
The option to trigger auxiliary output relays is provided for any of the selected Logic
Element functions.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
SETPOINTS > S4 CONTROLS > LOGIC ELEMENTS
LE1(16) FUNCTION
Range: Disabled, Control, Alarm, Latched Alarm, Trip
Default: Disabled
For details see
Common
.
S5 INPUTS/OUTPUTS > VIRTUAL INPUTS
setpoints.
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 6: SETPOINTS
SETPOINTS > S4 CONTROL > VIRTUAL
, and its type "Self-
section for more
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