GE N60 Instruction Manual page 126

FRONT PANEL INTERFACE
Event-cause indicators
Event-cause LEDs are turned on or off by protection elements that have their respective target setting selected as either
"Enabled" or "Latched." If a protection element target setting is "Enabled," then the corresponding event cause LEDs
remain on as long as operate the operand associated with the element remains asserted. If a protection element target
setting is "Latched," then the corresponding event cause LEDs turn on when the operate operand associated with the
element is asserted and remain on until the
All elements that are able to discriminate faulted phases can independently turn off or on the phase A, B, or C LEDs. This
includes phase instantaneous overcurrent, phase undervoltage, and so on. This means that the phase A, B, and C operate
operands for individual protection elements are ORed to turn on or off the phase A, B, or C LEDs.
• VOLTAGE — Indicates voltage was involved
• CURRENT — Indicates current was involved
• FREQUENCY — Indicates frequency was involved
• OTHER — Indicates a composite function was involved
• PHASE A — Indicates phase A was involved
• PHASE B — Indicates phase B was involved
• PHASE C — Indicates phase C was involved
• NEUTRAL/GROUND — Indicates that neutral or ground was involved
4
User-programmable indicators
The second and third panels provide 48 amber LED indicators whose operation is controlled by the user. Support for
applying a customized label beside every LED is provided.
User customization of LED operation is of maximum benefit in installations where languages other than English are used
to communicate with operators. See the User-programmable LEDs section in chapter 5 for the settings used to program
the operation of the LEDs on these panels.
Default labels for LED panel 2
The default labels are intended to represent the following:
• GROUP 1...6 — The illuminated GROUP is the active settings group
• BREAKER 1(2) OPEN — The breaker is open
• BREAKER 1(2) CLOSED — The breaker is closed
• BREAKER 1(2) TROUBLE — A problem related to the breaker has been detected
• SYNCHROCHECK NO1(6) IN-SYNCH — Voltages have satisfied the synchrocheck element
The relay is shipped with the default label for the LED panel 2. The LEDs, however, are not pre-programmed. To match the
pre-printed label, the LED settings must be entered as shown in the User-programmable LEDs section of chapter 5. The
LEDs are fully user-programmable. The default labels can be replaced by user-printed labels for both panels as explained in
the next section.
4-22
button on the front panel is pressed after the operand is reset.
RESET
Figure 4-24: LED panels 2 and 3 (index template)
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: INTERFACES