GE 745 - 5.6.10.3 Frequency Decay

5–80 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S4 ELEMENTS CHAPTER 5: SETPOINTS
FIGURE 5–30: Underfrequency 1 scheme logic
5.6.10.3 Frequency Decay
PATH: SETPOINTS  S4 ELEMENTS  FREQUENCY  FREQUENCY DECAY
 FREQUENCY []
DECAY
FREQUENCY DECAY
FUNCTION: Disabled
Range: Enabled, Disabled
MESSAGE
FREQUENCY DECAY
RLYS (1-8): --------
Range: 1 to 8
MESSAGE
FREQUENCY DECAY
TARGET: Self-Reset
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
FREQUENCY DECAY
THRESHOLD: 59.50 Hz
Range: 45.00 to 59.99 Hz in steps of
0.01
MESSAGE
FREQUENCY DECAY
DELAY: 0.00 s
Range: 0.00 to 600.00 s in steps of 0.01
MESSAGE
FREQUENCY DECAY
RATE 1: 0.4 Hz/s
Range: 0.1 to 5.0 Hz/s in steps of 0.1