6–112
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S4 CONTROLS
CHAPTER 6: SETPOINTS
Figure 35: Virtual inputs scheme logic
Logic elements
The 345 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 three triggering inputs in an “OR” gate for Logic Element
operation, and up to three blocking inputs in an “OR” 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
. The Trip output relay will be
triggered when
Trip
is selected as a function, and the Logic element operates. Output relay
#1 (Trip) will not be triggered during Logic Element operation if
Alarm
,
Latched Alarm
, or
Control
is selected.
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 > S4 LOGIC ELEMENTS
LE1(16) FUNCTION
Range: Disabled, Control, Alarm, Latched Alarm, Trip
Default: Disabled
This setting defines the use of the Logic Element. When
Trip
is selected as a function, the
Logic Element will trigger Output Relay # 1 (Trip) upon operation.
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