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CHAPTER 3: INTERFACES
LED status indicators
NOTE:
NOTE
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
The MESSAGE ▲ and MESSAGE ▼ keys scroll through any active conditions in the relay.
Diagnostic messages are displayed indicating the state of protection and monitoring
elements that are picked up, operating, or latched.
•
IN SERVICE: Green
This LED will be continuously "ON", when the relay is set to "Ready" under S1 RELAY
SETUP/INSTALLATION/RELAY STATUS, and no major self-test errors have been
detected.
•
TROUBLE: Amber
This LED will turn "ON", when the relay is not programmed (Not Ready) state under S1
RELAY SETUP/INSTALLATION/RELAY STATUS, or upon detection of a major self-test
error. The relay will turn back to "IN-SERVICE" if no major self-test error is present.
•
SETPOINT GROUP 1, 2: Green
These LEDs indicate the group of active protection elements. If setpoint group 1 is lit
green, only the protection elements under group 1 will be active. The protection
elements from group 2 will be inactive. The settings for each protection element can
be edited and displayed regardless of the active group.
•
TRIP: Red
This indicator turns on when the relay detects a fault and sends a trip command to the
trip output relay. The LED will reset by initiating a reset command from either the
RESET pushbutton Breaker Control, or communications; in all cases after the fault
condition has cleared.
•
ALARM: Amber
This LED will flash upon detection of an alarm condition, with element functions
selected as "alarm". The LED will automatically turn off if the alarm condition clears.
The LED will remain steady "ON", if the function of the operated protection was
selected as "latched alarm".
•
PICKUP: Amber
This indicator will light ON upon pickup condition generated by any of the relay
features. The indicator will turn off if no pickup condition is detected.
•
BREAKER OPEN: Red/Green/Orange – programmable
When the breaker is open, this indicator will be on continuously.
•
BREAKER CLOSED: Red/Green/Orange – programmable
When the breaker is closed, this indicator will be on continuously.
Breaker status indication is based on the breaker's 52a and 52b contacts. With both
contacts wired to the relay, closed breaker status is determined by closed 52a contact
and opened 52b contact. Visa-versa the open breaker status is determined by opened
52a contact and closed 52b contact. If both 52a and 52b contacts are open, due to a
breaker being racked out from the switchgear, both the Breaker Open and Breaker
Closed LED Indicators will be off.
It is strongly recommended to detect the breaker status by using both 52a and 52b
contacts.
The 345 provides also detecting the breaker status by using only one contact: either
52a or 52b. However, one should be aware that in such cases, it would be impossible
to distinguish between a breaker open state and breaker racked out state, unless
another contact from the breaker is wired to the relay.
FRONT CONTROL PANEL INTERFACE
3–5
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