GE F60 Instruction Manual page 500

CONTROL ELEMENTS
The element responds to rate of change of frequency with voltage, current and frequency supervision.
FREQ RATE 1 TREND
change in either direction.
FREQ RATE 1 PICKUP
trend, set
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.
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.
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.
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
5
increasing trend but only if the frequency is already above certain level, set this setting to the required frequency level.
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.
5-286
FREQ RATE 1 TARGET:

Self-reset
FREQ RATE 1 EVENTS:

Disabled
— This setting configures the element to respond to increasing or decreasing frequency, or to frequency
— This setting specifies an intended df/dt pickup threshold. For applications monitoring a decreasing
to "Decreasing" and specify the pickup threshold accordingly. The operating condition is:
— This setting defines the minimum voltage level required for operation of the element. The
— This setting defines minimum current level required for operation of the element. The
— This setting defines the minimum frequency level required for operation of the element. The
— This setting defines the maximum frequency level required for operation of the element.
Figure 5-158: Frequency rate of change logic
Range: Self-reset, Latched, Disabled
Range: Disabled, Enabled
to "Increasing" and specify the pickup threshold
FREQ RATE 1 TREND
FREQ RATE 1 TREND
F60 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
to "Bi-Directional" and