GE 745 TRANSFORMER MANAGEMENT RELAY

4-2 745 Transformer Management Relay GE Power Management
4.2 DISPLAY, INDICATORS, AND FRONT PORT 4 FRONT PANEL OPERATION
4
4.2 DISPLAY, INDICATORS, AND FRONT PORT 4.2.1 DISPLAY
All messages are displayed in English on the 40-character vacuum fluorescent display, which is visible 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 when no trips or alarms are active.
4.2.2 LEDS
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 CONDITIONS, 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
All indicators can be tested by pressing while no conditions are active.
4.2.3 STATUS INDICATORS
a) IN SERVICE
The IN SERVICE indicator is on when relay protection is operational.
The indicator is on only if all of the following conditions are met:
• S1 745 SETUP / INSTALLATION / 745 SETPOINTS:
Programmed
• S6 TESTING / OUTPUT RELAYS / FORCE OUTPUT RELAYS FUNCTION:
Disabled
• S6 TESTING / SIMULATION / SIMULATION SETUP / SIMULATION FUNCTION:
Disabled
• No self-test errors which have an effect on protection have been detected
• code programming mode is inactive
• factory service mode is disabled
b) SELF-TEST ERROR
The SELF-TEST ERROR indicator is on when any of the self-diagnostic tests, per-
formed either at power-on or in the background during normal operation, has detected
a problem with the relay.
c) TEST MODE
The TEST MODE 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:
• S6 TESTING/OUTPUT RELAYS/FORCE OUTPUT RELAYS FUNCTION:
Enabled
• S6 TESTING/ANALOG OUTPUTS/FORCE ANALOG OUTPUTS FUNCTION:
Enabled
•
S6 TESTING/SIMULATION/SIMULATION SETUP/SIMULATION FUNCTION:
Prefault Mode / Fault Mode / Playback Mode
• factory service mode is enabled
N EXT
N EXT