GE 745 - 5.6.10.4 Overfrequency

5–82 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S4 ELEMENTS CHAPTER 5: SETPOINTS
5.6.10.4 Overfrequency
PATH: SETPOINTS  S4 ELEMENTS  FREQUENCY  OVERFREQUENCY 1(2)
• MINIMUM OPERATING CURRENT: Enter the minimum value of winding 1 phase A
current (in units of relay nominal current) required to allow the overfrequency element
to operate.
• MINIMUM OPERATING VOLTAGE: Enter the minimum voltage value (in units of relay
nominal voltage) required to allow overfrequency to operate.
• OVERFREQUENCY PICKUP: Enter the frequency (in Hz) above which the overfrequency
element will pickup and start the delay timer.
 OVERFREQUENCY [] OVERFREQUENCY
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
OVERFREQUENCY
RLYS (1-8): --------
Range: 1 to 8
MESSAGE
OVERFREQUENCY
TARGET: Latched
Range: Self-Reset, Latched, None
MESSAGE
CURRENT SENSING:
Enabled
Range: Enabled, Disabled
MESSAGE
MINIMUM OPERATING
CURRENT: 0.20 x CT
Range: 0.05 to 1.00 x CT in steps of
0.01
MESSAGE
MINIMUM OPERATING
VOLTAGE: 0.50 x VT
Range: 0.10 to 0.99 x CT in steps of
0.01
MESSAGE
OVERFREQUENCY
PICKUP: 60.50 Hz
Range: 50.01 to 65.00 Hz in steps of
0.01
MESSAGE
OVERFREQUENCY
DELAY: 5.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
OVERFREQUENCY
BLOCK: Disabled
Range: Logc Inpt 1 to 16, Virt Inpt 1 to
16, Output Rly 2 to 8, SelfTest
Rly, Vir Outpt 1 to 5, Disabled