GE N60 Instruction Manual page 477

CHAPTER 5: SETTINGS
The element responds to rate of change of frequency with voltage, current and frequency supervision.
— This setting configures the element to respond to increasing or decreasing frequency, or to frequency
FREQ RATE 1 TREND
change in either direction.
— This setting specifies an intended df/dt pickup threshold. For applications monitoring a decreasing
FREQ RATE 1 PICKUP
trend, set to "Decreasing" and specify the pickup threshold accordingly. The operating condition is:
FREQ RATE 1 TREND
-df/dt > Pickup.
For applications monitoring an increasing trend, set
accordingly. The operating condition is: df/dt > Pickup.
For applications monitoring rate of change of frequency in any direction set
specify the pickup threshold accordingly. The operating condition is: abs (df/dt) > Pickup.
— This setting defines the minimum voltage level required for operation of the element. The
FREQ RATE 1 OV SUPV PICKUP
supervising function responds to the positive-sequence voltage. Use overvoltage supervision to prevent operation under
specific system conditions, such as faults.
— This setting defines minimum current level required for operation of the element. The
FREQ RATE 1 OC SUPV PICKUP
supervising function responds to the positive-sequence current. Typical application includes load shedding. Set the pickup
threshold to 0.020 if no overcurrent supervision is required.
— This setting defines the minimum frequency level required for operation of the element. The
FREQ RATE 1 MIN FREQUENCY
setting can be used to effectively block the feature based on frequency. For example, if the intent is to monitor an
increasing trend but only if the frequency is already above certain level, set this setting to the required frequency level.
— This setting defines the maximum frequency level required for operation of the element.
FREQ RATE 1 MAX FREQUENCY
The setting can be used to effectively block the feature based on frequency. For example, if the intent is to monitor a
decreasing trend but only if the frequency is already below a certain level (such as for load shedding), set this setting to the
required frequency level.
If the signal source assigned to the frequency rate of change element is only set to auxiliary VT, then the minimum
voltage supervision is 3 V.
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
FREQ RATE 1 OV SUPV

PICKUP: 0.700 pu
FREQ RATE 1 OC SUPV

PICKUP: 0.200 pu
FREQ RATE 1 MIN

FREQUENCY: 45.00 Hz
FREQ RATE 1 MAX

FREQUENCY: 65.00 Hz
FREQ RATE 1 PICKUP

DELAY: 0.000 s
FREQ RATE 1 RESET

DELAY: 0.000 s
FREQ RATE 1 BLOCK:

Off
FREQ RATE 1 TARGET:

Self-reset
FREQ RATE 1 EVENTS:

Disabled
FREQ RATE 1 TREND
Range: 0.100 to 3.000 pu in steps of 0.001
Range: 0.020 to 30.000 pu in steps of 0.001
Range: 20.00 to 80.00 Hz in steps of 0.01
Range: 20.00 to 80.00 Hz in steps of 0.01
Range: 0 to 65.535 s in steps of 0.001
Range: 0 to 65.535 s in steps of 0.001
Range: FlexLogic operand
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
to "Increasing" and specify the pickup threshold
to "Bi-Directional" and
FREQ RATE 1 TREND
CONTROL ELEMENTS
5
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