GE G30 Instruction Manual page 170
Generator protection system 7.6x
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- Instruction manual (698 pages) ,
- Communications manual (532 pages) ,
- Instruction manual (652 pages)
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FRONT PANEL INTERFACE
•
TEST MODE — Indicates that the relay is in Isolated (solid) or Forcible (flashing) test mode. For information, see the Test
Mode section in the Settings chapter.
•
TRIP — Indicates that the selected FlexLogic operand serving as a trip input has operated. Set the operand under
Settings > Product Setup > User-Programmable LEDs > Trip & Alarm LEDs. This indicator latches; initiate the reset
command to reset the latch.
•
ALARM — Indicates that the selected FlexLogic operand serving as an alarm input has operated. Set the operand
under Settings > Product Setup > User-Programmable LEDs > Trip & Alarm LEDs.
4
User-programmable event-cause indicators
Event-cause LEDs are below the status LEDs. They are turned on or off by protection elements that have their respective
target setting selected as "Self-Reset" or "Latched." If set to "Self-Reset," then the corresponding event cause LED remains
on as long as the operand associated with the element remains asserted. If set to "Latched" and asserted, then it remains
on until the operand is reset and then a reset command initiated.
All elements that are able to discriminate faulted phases can independently turn on or off 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.
The LEDs have defaults and can be configured to show instead the status of any FlexLogic operand.
The labelling area has a clear cover for custom labels. A utility is available to print stick-on labels, as outlined later in this
chapter.
These LEDs are programmed by default as follows:
•
PICKUP — LED 6 — Indicates that an element is picked up, and hence a trip can be imminent
•
VOLTAGE — LED 7 — Indicates voltage was involved
•
CURRENT — LED 8 — Indicates current was involved
•
FREQUENCY — LED 9 — Indicates frequency was involved
•
OTHER — LED 10 — Indicates a composite function was involved
•
PHASE A — LED 11 — Indicates phase A was involved
•
PHASE B — LED 12 — Indicates phase B was involved
•
PHASE C — LED 13 — Indicates phase C was involved
•
NEUTRAL/GROUND — LED 14 — Indicates that neutral or ground was involved
4-42
Figure 4-51: Example of LEDs on graphical front panel
G30 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: INTERFACES
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