4–274 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
MONITORING CHAPTER 4: SETPOINTS
UPPER FREQUENCY
Range: 5.00 to 70.00 Hz in steps of 0.01 Hz
Default: 60.00 Hz
This setting specifies the upper frequency value, in Hz, above which Accumulator 1(7)
starts accumulating time and asserts the PKP operand. This upper frequency value must
be greater than the lower frequency value.
LOWER FREQUENCY
Range: 5.00 to 70.00 Hz in steps of 0.01 Hz
Default: 60.00 Hz
This setting specifies the lower frequency value, in Hz, below which Accumulator 1(7)
starts accumulating time and asserts the PKP operand. This lower frequency value must
be less than the upper frequency value.
TIME LIMIT
Range: 1 to 100000 s in steps of 1 s
Default: 200 s
This setting specifies the accumulating time limit (in seconds) above which this function
asserts the OP operand.
TIME PRESET
Range: 0 to 100000 s in steps of 1 s
Default: 0 s
This setting allows the user to initialize or preset the accumulator time (in seconds) in
case this value is known from previous operation of a turbine.
NOTE:
The TIME PRESET value must be higher than the current accumulator value in order to
Preset.
OUTPUT RELAY
Range: Do Not Operate, Operate
Default: Do Not Operate
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