4–16
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
A4 TARGET MESSAGES
CHAPTER 4: ACTUAL VALUES
A4 Target messages
Target messages are automatically displayed for any active condition on the relay such as
pickups, trips, alarms, or asserted input. The target messages shown in the table below are
displayed as necessary.
The relay displays the most recent event first, and after 5 seconds starts rolling up the
other target messages, until the Reset command is initiated. If the Reset command is not
performed, but any of the other faceplate pushbuttons is pressed, the display will not
show the target messages, unless the user navigates to
ACTUAL VALUES > A4 TARGET
MESSAGES
, where they can be reviewed.
The target messages can be reviewed by pressing
Up
and
Down
message pushbuttons
from the relay keypad.
For a complete list of Active Targets, see Format Code FC134A in the
3 Series
Communications Guide
. Note that the format codes differ for each relay model.
•
The PKP messages will appear on the relay display as long as their respective flags are
active. The messages will disappear from the display, when either the protection
element drops out before operation, such as when the condition clears before
reaching operation, or when the protection element operates.
•
The OP and BKR Status messages will appear on the relay display, when the
respective element operates, with the element function set to “TRIP”, or “LATCHED
ALARM”. The message will stay on the display after the condition clears, and will
disappear upon Reset command. If the element function is selected to “ALARM”, or
“CONTROL”, the message will disappear from the display, when the condition causing
operation clears.
•
The Breaker Open and Breaker Close messages will appear on the display and stay for
5 seconds only, unless the reset command is initiated, or the element changes its
state. For example, if the breaker is detected “Open”, the message “Breaker Open OK”
will appear on the display and will stay for 5 seconds, unless the breaker status
changes to “Close”. If the breaker status changes to "Close" within 5 seconds after the
breaker has been detected open, the message “Breaker Open OK” will disappear, and
the message “Breaker Close OK” will appear and stay for 5 seconds.
•
The Contact Input ON/OFF, Virtual Input ON/OFF, and Remote Input ON/OFF messages
will not appear as target messages upon change of state. The state change, however,
will be logged in the Event recorder.
Examples of how the messages appear on the display:
Example 1:
Phase IOC1 Settings:
•
PH IOC1 FUNCTION = Trip
•
PH IOC1 PICKUP = 1.00 x CT
•
PH IOC1 DELAY = 0.20 s
When current greater than the IOC1 pickup level is applied, the 3345 50 display shows the
following target message:
A4 TARGET MESSAGES
Ph IOC1 Trip
STATE: PKP
After the 200 ms time delay expires, the display shows the following message only:
A4 TARGET MESSAGES
Ph IOC1 Trip
STATE: OP
Example 2:
Summary of Contents for 345
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