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745
Transformer Management Relay
Display
LEDs
LED Indicators
4–2
All messages are displayed in English on the 40-character liquid crystal display,
which is backlit for visibility under varied lighting conditions. When the keypad and
display are not actively being used, the screen sequentially displays up to 30 user-
selected default messages providing system information. These messages appear
after a time of inactivity that is programmable by the user. Pressing any key after
default messages have appeared will return the display to the last message
displayed before the default messages appeared. Trip and alarm condition messages
automatically override default messages. All display pixels are illuminated briefly
during power up self-testing, and can be energized by pressing any key when no
trips or alarms are active.
Front panel indicators are grouped in three columns: Relay Status, which provides
information about the state of the 745; System Status, which provides information
about the state of the transformer and the power system; and Output Status, which
provides details about abnormal conditions that have been detected. The color of
each indicator conveys information about its importance:
GREEN (G): indicates a general condition
AMBER (A): indicates an alert condition
RED (R): indicates a serious alarm or warning
a) 745 Status
•
RELAY IN SERVICE: The In Service LED is on when relay protection is
operational. The indicator is on only if all of the following conditions are met:
–
The
S1 745 SETUP
"Programmed".
–
The
S6 TESTING
!
OUTPUT RELAYS
set to "Disabled".
–
The
S6 TESTING
!"
setpoint is set to "Disabled".
–
No self-test errors which have an effect on protection have been detected.
–
Code programming mode is inactive.
–
Factory service mode is disabled.
•
SELF-TEST ERROR: The Self-Test Error LED is on when any of the self-
diagnostic tests, performed either at power-on or in the background during
normal operation, has detected a problem with the relay.
•
TEST MODE: The Test Mode LED indicator is on when any of the 745 testing
features has been enabled. The indicator is on if any of the following conditions
are met:
–
The
S6 TESTING
!
OUTPUT RELAYS
set to "Enabled".
–
The
S6 TESTING
!"
setpoint is "Enabled".
–
The
S6 TESTING
!"
setpoint is set to "Prefault Mode", "Fault Mode", or "Playback Mode".
–
Factory service mode is enabled.
•
DIFFERENTIAL BLOCKED: The Differential Blocked LED indicator is on when
the restrained differential protection feature is enabled but is being blocked
from operating by any of the harmonic inhibit features. The indicator is on if the
Harmonic Inhibit element is blocking any phase (see Harmonic Inhibit Scheme
Logic on page 5–45).
•
LOCAL: The Local LED indicator is on when the 745 is in local mode, i.e. the
front panel RESET key is operational.
•
MESSAGE: The Message LED indicator is on when any element has picked up,
operated, or is now in a latched state waiting to be reset. With this indicator on,
http://www.GEindustrial.com/multilin
INSTALLATION
745 SETPOINTS
!"
!"
!
FORCE OUTPUT RELAYS FUNCTION
SIMULATION
SIMULATION SETUP
!
!
FORCE OUTPUT RELAYS FUNCTION
ANALOG OUTPUTS
FORCE ANALOG OUTPUTS FUNCTION
!
SIMULATION
!
SIMULATION SETUP
Hardware Interface
setpoint is set to
setpoint is
SIMULATION FUNCTION
!
setpoint is
!
SIMULATION FUNCTION
GE Multilin
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