Overload Alarm - GE 889 Instruction Manual

PROTECTION

Overload Alarm

4–154
The Overload Alarm is used to alarm abnormal load increases that can indicate problems
with the process. An alarm is generated when the load current (Path:
> General > Load Current ) exceeds the Pickup setting for the time delay specified by the
setting Pickup Delay. When the current has subsided, the alarm stays active for the time
specified by the setting Dropout Delay.
Path: Setpoints > Protection > Generator > Group 1 > Overload Alarm
FUNCTION
Range: Disabled, Alarm, Latched Alarm, Configurable
Default: Disabled
When the Alarm function is selected and the element operates, the "ALARM" LED will
flash; it will self-reset when the operating conditions are cleared.
When the Latched Alarm function is selected, and the element operates, the "ALARM"
LED will flash during the TOC operating condition, and will be steadily lit after the
conditions are cleared. The "ALARM" LED can be cleared by issuing a Reset command.
Output relay #1 "Trip" will not operate if the Alarm or Latched Alarm setting is selected.
When the Configurable function is selected, neither ALARM LED will turn on
automatically. These must be configured using the Alarm menus and FlexLogic
operands.The selected auxiliary output relays will operate if the Latched Alarm, Alarm,
or Configurable setting is selected and the element operates.
PICKUP
Range: 0.50 to 3.00 x FLA in steps of 0.01 x FLA
Default: 1.01 x FLA
PICKUP DELAY
Range: 0.00 to 180.00 s in steps of 0.01 s
Default: 1.00 s
DROPOUT DELAY
Range: 0.00 to 180.00 s in steps of 0.01 s
Default: 1.00 s
OUTPUT RELAY X
Range: Do Not Operate, Operate
Default: Do Not Operate
Any assignable output relay can be selected to operate upon generator overload
operation. The operation of these general relays is programmed by the user. Each relay
can be selected to become either energized or de-energized when operated, and to
operate as latched, self-resetting or pulsed.
BLOCK
Range: Off, Any FlexLogic operand
Default: Off
EVENTS
Range: Disabled, Enabled
Default: Enabled
TARGETS
Range: Disabled, Self-reset, Latched
Default: Latched
889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: SETPOINTS
Metering > Generator