5-234 L90 Line Current Differential System GE Multilin5.7 CONTROL ELEMENTS 5 SETTINGS55.7.8 FREQUENCY RATE OF CHANGEPATH: SETTINGS ÖØ CONTROL ELEMENTS ÖØ FREQUENCY RATE OF CHANGE Ö FREQUENCY RATE OF CHANGE 1(4)Four (4) independent rate of change of frequency elements are available. The element responds to rate of change of fre-quency with voltage, current and frequency supervision.• FREQ RATE 1 TREND: This setting allows configuring the element to respond to increasing or decreasing frequency,or to frequency change in either direction.• FREQ RATE 1 PICKUP: This setting specifies an intended pickup threshold. For applications monitoring adecreasing trend, set FREQ RATE 1 TREND to “Decreasing” and specify the pickup threshold accordingly. The operatingcondition is: .For applications monitoring an increasing trend, set FREQ RATE 1 TREND to “Increasing” and specify the pickup thresh-old accordingly. The operating condition is: .For applications monitoring rate of change of frequency in any direction set FREQ RATE 1 TREND to “Bi-Directional” andspecify the pickup threshold accordingly. The operating condition is:• FREQ RATE 1 OV SUPV PICKUP: This setting defines minimum voltage level required for operation of the element.The supervising function responds to the positive-sequence voltage. Overvoltage supervision should be used to pre-vent operation under specific system conditions such as faults.• FREQ RATE 1 OC SUPV PICKUP: This setting defines minimum current level required for operation of the element.The supervising function responds to the positive-sequence current. Typical application includes load shedding. Setthe pickup threshold to zero if no overcurrent supervision is required. FREQUENCY RATE OF CHANGE 1FREQ RATE 1FUNCTION: DisabledRange: Disabled, EnabledMESSAGE FREQ RATE 1 SOURCE:SRC 1Range: SRC 1, SRC 2, SRC 3, SRC 4MESSAGE FREQ RATE 1 TREND:DecreasingRange: Increasing, Decreasing, Bi-directionalMESSAGE FREQ RATE 1 PICKUP:0.50 Hz/secRange: 0.10 to 15.00 Hz/sec in steps of 0.01MESSAGE FREQ RATE 1 OV SUPVPICKUP: 0.700 puRange: 0.100 to 3.000 pu in steps of 0.001MESSAGE FREQ RATE 1 OC SUPVPICKUP: 0.200 puRange: 0.000 to 30.000 pu in steps of 0.001MESSAGE FREQ RATE 1 MINFREQUENCY: 45.00 HzRange: 20.00 to 80.00 Hz in steps of 0.01MESSAGE FREQ RATE 1 MAXFREQUENCY: 65.00 HzRange: 20.00 to 80.00 Hz in steps of 0.01MESSAGE FREQ RATE 1 PICKUPDELAY: 0.000 sRange: 0 to 65.535 s in steps of 0.001MESSAGE FREQ RATE 1 RESETDELAY: 0.000 sRange: 0 to 65.535 s in steps of 0.001MESSAGE FREQ RATE 1 BLOCK:OffRange: FlexLogic™ operandMESSAGE FREQ RATE 1 TARGET:Self-ResetRange: Self-Reset, Latched, DisabledMESSAGE FREQ RATE 1 EVENTS:DisabledRange: Disabled, Enableddf dtedf dte– Pickup!df dte Pickup!abs df dte Pickup!
